[....] Starting enhanced syslogd: rsyslogd[ 18.404396] audit: type=1400 audit(1517497420.471:5): avc: denied { syslog } for pid=4047 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.798694] audit: type=1400 audit(1517497425.866:6): avc: denied { map } for pid=4187 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 30.106762] audit: type=1400 audit(1517497432.174:7): avc: denied { map } for pid=4201 comm="syzkaller148927" path="/root/syzkaller148927505" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.186906] ------------[ cut here ]------------ [ 34.192768] ODEBUG: activate active (active state 1) object type: rcu_head hint: (null) [ 34.201856] WARNING: CPU: 0 PID: 5989 at lib/debugobjects.c:291 debug_print_object+0x166/0x220 [ 34.210575] Kernel panic - not syncing: panic_on_warn set ... [ 34.210575] [ 34.217913] CPU: 0 PID: 5989 Comm: syzkaller148927 Not tainted 4.15.0+ #290 [ 34.224982] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.234310] Call Trace: [ 34.236879] dump_stack+0x194/0x257 [ 34.240482] ? arch_local_irq_restore+0x53/0x53 [ 34.245129] ? vsnprintf+0x1ed/0x1900 [ 34.248914] panic+0x1e4/0x41c [ 34.252081] ? refcount_error_report+0x214/0x214 [ 34.256815] ? show_regs_print_info+0x18/0x18 [ 34.261291] ? __warn+0x1c1/0x200 [ 34.264724] ? debug_print_object+0x166/0x220 [ 34.269192] __warn+0x1dc/0x200 [ 34.272449] ? debug_print_object+0x166/0x220 [ 34.276925] report_bug+0x211/0x2d0 [ 34.280532] fixup_bug.part.11+0x37/0x80 [ 34.284569] do_error_trap+0x2d7/0x3e0 [ 34.288436] ? math_error+0x400/0x400 [ 34.292215] ? vprintk_emit+0x3ea/0x590 [ 34.296174] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.300995] do_invalid_op+0x1b/0x20 [ 34.304684] invalid_op+0x22/0x40 [ 34.308111] RIP: 0010:debug_print_object+0x166/0x220 [ 34.313186] RSP: 0018:ffff8801d82df400 EFLAGS: 00010082 [ 34.318522] RAX: dffffc0000000008 RBX: 0000000000000003 RCX: ffffffff815a4e0e [ 34.325764] RDX: 0000000000000000 RSI: 1ffff1003b05be3b RDI: ffff8801db41f6d0 [ 34.333009] RBP: ffff8801d82df440 R08: 0000000000000000 R09: 1ffff1003b05be0d [ 34.340255] R10: ffff8801d82df300 R11: ffffffff86b39018 R12: 0000000000000001 [ 34.347510] R13: ffffffff86b41f20 R14: ffffffff86012ae0 R15: 0000000000000000 [ 34.354770] ? vprintk_func+0x5e/0xc0 [ 34.359843] debug_object_activate+0x49b/0x730 [ 34.364408] ? mutex_lock_io_nested+0x1900/0x1900 [ 34.369228] ? debug_object_assert_init+0x570/0x570 [ 34.374219] ? __is_insn_slot_addr+0x1fc/0x330 [ 34.378786] ? find_held_lock+0x35/0x1d0 [ 34.382830] ? pppol2tp_session_destruct+0x110/0x110 [ 34.387909] __call_rcu.constprop.67+0xf2/0xef0 [ 34.392556] ? __call_rcu.constprop.67+0xf2/0xef0 [ 34.397374] ? lock_downgrade+0x980/0x980 [ 34.401499] ? check_noncircular+0x20/0x20 [ 34.405711] ? rcu_process_callbacks+0x17f0/0x17f0 [ 34.410615] ? lock_downgrade+0x980/0x980 [ 34.414749] ? __mutex_unlock_slowpath+0xe9/0xac0 [ 34.419572] ? wait_for_completion+0x770/0x770 [ 34.424128] ? pppol2tp_release+0x1ae/0x560 [ 34.428426] ? lock_downgrade+0x980/0x980 [ 34.432573] call_rcu_sched+0x12/0x20 [ 34.436351] pppol2tp_release+0x34d/0x560 [ 34.440475] ? pppol2tp_sendmsg+0x670/0x670 [ 34.444776] ? fsnotify_first_mark+0x2b0/0x2b0 [ 34.449339] sock_release+0x8d/0x1e0 [ 34.453028] ? sock_alloc_file+0x560/0x560 [ 34.457235] sock_close+0x16/0x20 [ 34.460664] __fput+0x327/0x7e0 [ 34.463923] ? fput+0x140/0x140 [ 34.467178] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.471655] ____fput+0x15/0x20 [ 34.474912] task_work_run+0x199/0x270 [ 34.478774] ? task_work_cancel+0x210/0x210 [ 34.483083] ? _raw_spin_unlock+0x22/0x30 [ 34.487205] ? switch_task_namespaces+0x87/0xc0 [ 34.491856] do_exit+0x9bb/0x1ad0 [ 34.495289] ? mm_update_next_owner+0x930/0x930 [ 34.499935] ? pppol2tp_connect+0x91a/0x1dd0 [ 34.504328] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 34.509499] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 34.514842] ? selinux_socket_connect+0x311/0x730 [ 34.519659] ? lock_downgrade+0x980/0x980 [ 34.523787] ? selinux_socket_setsockopt+0x80/0x80 [ 34.528689] ? lock_release+0xa40/0xa40 [ 34.532640] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 34.538760] ? __check_object_size+0x25d/0x4f0 [ 34.543325] ? __might_sleep+0x95/0x190 [ 34.547289] ? security_socket_connect+0x89/0xb0 [ 34.552027] ? SYSC_connect+0x2e0/0x4a0 [ 34.555977] ? SYSC_bind+0x410/0x410 [ 34.559672] ? do_page_fault+0xee/0x720 [ 34.563622] ? __do_page_fault+0xc90/0xc90 [ 34.567839] do_group_exit+0x149/0x400 [ 34.571703] ? SyS_socket+0x12d/0x1d0 [ 34.575480] ? SyS_exit+0x30/0x30 [ 34.578914] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.583910] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.588746] SyS_exit_group+0x1d/0x20 [ 34.592529] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 34.597261] RIP: 0033:0x440cc9 [ 34.600426] RSP: 002b:00007ffefac52e48 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 34.608109] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440cc9 [ 34.615357] RDX: 0000000000440cc9 RSI: 000000000000002e RDI: 0000000000000000 [ 34.622615] RBP: 0000000000008561 R08: 0000000000000000 R09: 0000000000001759 [ 34.629898] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 [ 34.637145] R13: 0000000000000003 R14: 00000000006cf050 R15: 00000000004a260e [ 34.644409] [ 34.644412] ====================================================== [ 34.644415] WARNING: possible circular locking dependency detected [ 34.644416] 4.15.0+ #290 Not tainted [ 34.644418] ------------------------------------------------------ [ 34.644420] syzkaller148927/5989 is trying to acquire lock: [ 34.644421] ((console_sem).lock){..-.}, at: [<00000000c7e85caf>] down_trylock+0x13/0x70 [ 34.644427] [ 34.644429] but task is already holding lock: [ 34.644430] (&obj_hash[i].lock){-.-.}, at: [<000000003d0dc721>] debug_object_activate+0x1d7/0x730 [ 34.644435] [ 34.644437] which lock already depends on the new lock. [ 34.644438] [ 34.644439] [ 34.644441] the existing dependency chain (in reverse order) is: [ 34.644442] [ 34.644443] -> #3 (&obj_hash[i].lock){-.-.}: [ 34.644449] _raw_spin_lock_irqsave+0x96/0xc0 [ 34.644451] __debug_object_init+0x109/0x1040 [ 34.644453] debug_object_init+0x17/0x20 [ 34.644454] hrtimer_init+0x8c/0x410 [ 34.644456] init_dl_task_timer+0x1b/0x50 [ 34.644458] __sched_fork+0x2c4/0xb70 [ 34.644459] init_idle+0x75/0x820 [ 34.644461] sched_init+0xb19/0xc43 [ 34.644462] start_kernel+0x452/0x819 [ 34.644464] x86_64_start_reservations+0x2a/0x2c [ 34.644466] x86_64_start_kernel+0x77/0x7a [ 34.644468] secondary_startup_64+0xa5/0xb0 [ 34.644469] [ 34.644470] -> #2 (&rq->lock){-.-.}: [ 34.644475] _raw_spin_lock+0x2a/0x40 [ 34.644476] task_fork_fair+0x7a/0x690 [ 34.644478] sched_fork+0x435/0xc00 [ 34.644480] copy_process.part.37+0x1758/0x4b60 [ 34.644481] _do_fork+0x1f7/0xfe0 [ 34.644483] kernel_thread+0x34/0x40 [ 34.644485] rest_init+0x22/0xf0 [ 34.644486] start_kernel+0x7f1/0x819 [ 34.644488] x86_64_start_reservations+0x2a/0x2c [ 34.644490] x86_64_start_kernel+0x77/0x7a [ 34.644492] secondary_startup_64+0xa5/0xb0 [ 34.644493] [ 34.644493] -> #1 (&p->pi_lock){-.-.}: [ 34.644499] _raw_spin_lock_irqsave+0x96/0xc0 [ 34.644501] try_to_wake_up+0xbc/0x1600 [ 34.644502] wake_up_process+0x10/0x20 [ 34.644504] __up.isra.0+0x1cc/0x2c0 [ 34.644505] up+0x13b/0x1d0 [ 34.644507] __up_console_sem+0xb2/0x1a0 [ 34.644509] console_unlock+0x538/0xd70 [ 34.644511] vprintk_emit+0x4ad/0x590 [ 34.644512] vprintk_default+0x28/0x30 [ 34.644514] vprintk_func+0x57/0xc0 [ 34.644515] printk+0xaa/0xca [ 34.644517] regdb_fw_cb+0x1d7/0x220 [ 34.644519] request_firmware_work_func+0x151/0x2c0 [ 34.644521] process_one_work+0xbbf/0x1af0 [ 34.644523] worker_thread+0x223/0x1990 [ 34.644524] kthread+0x33c/0x400 [ 34.644526] ret_from_fork+0x3a/0x50 [ 34.644527] [ 34.644528] -> #0 ((console_sem).lock){..-.}: [ 34.644533] lock_acquire+0x1d5/0x580 [ 34.644535] _raw_spin_lock_irqsave+0x96/0xc0 [ 34.644537] down_trylock+0x13/0x70 [ 34.644539] __down_trylock_console_sem+0xa2/0x1e0 [ 34.644540] console_trylock+0x15/0x100 [ 34.644542] vprintk_emit+0x49b/0x590 [ 34.644544] vprintk_default+0x28/0x30 [ 34.644545] vprintk_func+0x57/0xc0 [ 34.644547] printk+0xaa/0xca [ 34.644548] __warn_printk+0x90/0xf0 [ 34.644550] debug_print_object+0x166/0x220 [ 34.644552] debug_object_activate+0x49b/0x730 [ 34.644554] __call_rcu.constprop.67+0xf2/0xef0 [ 34.644555] call_rcu_sched+0x12/0x20 [ 34.644557] pppol2tp_release+0x34d/0x560 [ 34.644559] sock_release+0x8d/0x1e0 [ 34.644560] sock_close+0x16/0x20 [ 34.644562] __fput+0x327/0x7e0 [ 34.644563] ____fput+0x15/0x20 [ 34.644565] task_work_run+0x199/0x270 [ 34.644567] do_exit+0x9bb/0x1ad0 [ 34.644568] do_group_exit+0x149/0x400 [ 34.644570] SyS_exit_group+0x1d/0x20 [ 34.644572] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 34.644573] [ 34.644575] other info that might help us debug this: [ 34.644575] [ 34.644577] Chain exists of: [ 34.644577] (console_sem).lock --> &rq->lock --> &obj_hash[i].lock [ 34.644584] [ 34.644586] Possible unsafe locking scenario: [ 34.644587] [ 34.644589] CPU0 CPU1 [ 34.644590] ---- ---- [ 34.644591] lock(&obj_hash[i].lock); [ 34.644595] lock(&rq->lock); [ 34.644599] lock(&obj_hash[i].lock); [ 34.644602] lock((console_sem).lock); [ 34.644605] [ 34.644606] *** DEADLOCK *** [ 34.644607] [ 34.644609] 2 locks held by syzkaller148927/5989: [ 34.644610] #0: (sk_lock-AF_PPPOX){+.+.}, at: [<0000000075d2b1cc>] pppol2tp_release+0x96/0x560 [ 34.644616] #1: (&obj_hash[i].lock){-.-.}, at: [<000000003d0dc721>] debug_object_activate+0x1d7/0x730 [ 34.644622] [ 34.644623] stack backtrace: [ 34.644626] CPU: 0 PID: 5989 Comm: syzkaller148927 Not tainted 4.15.0+ #290 [ 34.644629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.644630] Call Trace: [ 34.644632] dump_stack+0x194/0x257 [ 34.644633] ? arch_local_irq_restore+0x53/0x53 [ 34.644635] print_circular_bug.isra.38+0x2cd/0x2dc [ 34.644637] ? save_trace+0xe0/0x2b0 [ 34.644638] __lock_acquire+0x30a8/0x3e00 [ 34.644640] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 34.644642] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 34.644644] ? print_irqtrace_events+0x270/0x270 [ 34.644646] ? print_irqtrace_events+0x270/0x270 [ 34.644648] ? __lock_acquire+0x664/0x3e00 [ 34.644649] ? print_irqtrace_events+0x270/0x270 [ 34.644651] ? __lock_acquire+0x664/0x3e00 [ 34.644653] ? __lock_acquire+0x664/0x3e00 [ 34.644654] ? __lock_acquire+0x664/0x3e00 [ 34.644656] lock_acquire+0x1d5/0x580 [ 34.644658] ? lock_acquire+0x1d5/0x580 [ 34.644659] ? down_trylock+0x13/0x70 [ 34.644661] ? find_held_lock+0x35/0x1d0 [ 34.644662] ? lock_release+0xa40/0xa40 [ 34.644664] ? vprintk_emit+0x379/0x590 [ 34.644665] ? lock_downgrade+0x980/0x980 [ 34.644667] ? kvm_sched_clock_read+0x25/0x40 [ 34.644669] ? sched_clock+0x31/0x40 [ 34.644671] ? sched_clock_cpu+0x1b/0x170 [ 34.644672] ? vprintk_emit+0x49b/0x590 [ 34.644674] _raw_spin_lock_irqsave+0x96/0xc0 [ 34.644676] ? down_trylock+0x13/0x70 [ 34.644677] down_trylock+0x13/0x70 [ 34.644679] ? vprintk_emit+0x49b/0x590 [ 34.644681] __down_trylock_console_sem+0xa2/0x1e0 [ 34.644683] console_trylock+0x15/0x100 [ 34.644684] vprintk_emit+0x49b/0x590 [ 34.644686] vprintk_default+0x28/0x30 [ 34.644688] vprintk_func+0x57/0xc0 [ 34.644689] printk+0xaa/0xca [ 34.644691] ? show_regs_print_info+0x18/0x18 [ 34.644692] ? __warn_printk+0x84/0xf0 [ 34.644694] __warn_printk+0x90/0xf0 [ 34.644695] ? test_taint+0x20/0x20 [ 34.644697] ? lock_release+0xa40/0xa40 [ 34.644698] ? __might_sleep+0x95/0x190 [ 34.644700] debug_print_object+0x166/0x220 [ 34.644702] debug_object_activate+0x49b/0x730 [ 34.644704] ? mutex_lock_io_nested+0x1900/0x1900 [ 34.644705] ? debug_object_assert_init+0x570/0x570 [ 34.644707] ? __is_insn_slot_addr+0x1fc/0x330 [ 34.644709] ? find_held_lock+0x35/0x1d0 [ 34.644711] ? pppol2tp_session_destruct+0x110/0x110 [ 34.644713] __call_rcu.constprop.67+0xf2/0xef0 [ 34.644714] ? __call_rcu.constprop.67+0xf2/0xef0 [ 34.644716] ? lock_downgrade+0x980/0x980 [ 34.644718] ? check_noncircular+0x20/0x20 [ 34.644720] ? rcu_process_callbacks+0x17f0/0x17f0 [ 34.644721] ? lock_downgrade+0x980/0x980 [ 34.644723] ? __mutex_unlock_slowpath+0xe9/0xac0 [ 34.644725] ? wait_for_completion+0x770/0x770 [ 34.644726] ? pppol2tp_release+0x1ae/0x560 [ 34.644728] ? lock_downgrade+0x980/0x980 [ 34.644730] call_rcu_sched+0x12/0x20 [ 34.644731] pppol2tp_release+0x34d/0x560 [ 34.644733] ? pppol2tp_sendmsg+0x670/0x670 [ 34.644735] ? fsnotify_first_mark+0x2b0/0x2b0 [ 34.644736] sock_release+0x8d/0x1e0 [ 34.644738] ? sock_alloc_file+0x560/0x560 [ 34.644739] sock_close+0x16/0x20 [ 34.644741] __fput+0x327/0x7e0 [ 34.644742] ? fput+0x140/0x140 [ 34.644744] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.644745] ____fput+0x15/0x20 [ 34.644747] task_work_run+0x199/0x270 [ 34.644748] ? task_work_cancel+0x210/0x210 [ 34.644750] ? _raw_spin_unlock+0x22/0x30 [ 34.644752] ? switch_task_namespaces+0x87/0xc0 [ 34.644753] do_exit+0x9bb/0x1ad0 [ 34.644755] ? mm_update_next_owner+0x930/0x930 [ 34.644757] ? pppol2tp_connect+0x91a/0x1dd0 [ 34.644759] ? pppol2tp_recv_payload_hook+0x1b0/0x1b0 [ 34.644761] ? selinux_netlbl_socket_connect+0x76/0x1b0 [ 34.644763] ? selinux_socket_connect+0x311/0x730 [ 34.644764] ? lock_downgrade+0x980/0x980 [ 34.644766] ? selinux_socket_setsockopt+0x80/0x80 [ 34.644768] ? lock_release+0xa40/0xa40 [ 34.644770] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 34.644776] ? __check_object_size+0x25d/0x4f0 [ 34.644778] ? __might_sleep+0x95/0x190 [ 34.644779] ? security_socket_connect+0x89/0xb0 [ 34.644781] ? SYSC_connect+0x2e0/0x4a0 [ 34.644783] ? SYSC_bind+0x410/0x410 [ 34.644784] ? do_page_fault+0xee/0x720 [ 34.644786] ? __do_page_fault+0xc90/0xc90 [ 34.644788] do_group_exit+0x149/0x400 [ 34.644789] ? SyS_socket+0x12d/0x1d0 [ 34.644791] ? SyS_exit+0x30/0x30 [ 34.644793] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.644794] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.644796] SyS_exit_group+0x1d/0x20 [ 34.644798] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 34.644799] RIP: 0033:0x440cc9 [ 34.644801] RSP: 002b:00007ffefac52e48 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 [ 34.644806] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440cc9 [ 34.644808] RDX: 0000000000440cc9 RSI: 000000000000002e RDI: 0000000000000000 [ 34.644811] RBP: 0000000000008561 R08: 0000000000000000 R09: 0000000000001759 [ 34.644813] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 [ 34.644816] R13: 0000000000000003 R14: 00000000006cf050 R15: 00000000004a260e [ 35.691696] Shutting down cpus with NMI [ 36.636023] Dumping ftrace buffer: [ 36.639537] (ftrace buffer empty) [ 36.643217] Kernel Offset: disabled [ 36.646816] Rebooting in 86400 seconds..