[....] Starting enhanced syslogd: rsyslogd[ 12.057197] audit: type=1400 audit(1516395765.935:5): avc: denied { syslog } for pid=3503 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: [ 19.502037] audit: type=1400 audit(1516395773.379:6): avc: denied { map } for pid=3645 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program [ 26.362697] audit: type=1400 audit(1516395780.240:7): avc: denied { map } for pid=3659 comm="syzkaller642612" path="/root/syzkaller642612591" 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 [ 26.366653] [ 26.390208] ============================================ [ 26.395626] WARNING: possible recursive locking detected [ 26.401059] 4.15.0-rc8-next-20180119+ #102 Not tainted [ 26.406307] -------------------------------------------- [ 26.411736] syzkaller642612/3659 is trying to acquire lock: [ 26.417423] (&vq->mutex){+.+.}, at: [<000000002c447cb8>] vhost_chr_write_iter+0x278/0x1580 [ 26.425894] [ 26.425894] but task is already holding lock: [ 26.431836] (&vq->mutex){+.+.}, at: [<000000002c447cb8>] vhost_chr_write_iter+0x278/0x1580 [ 26.440309] [ 26.440309] other info that might help us debug this: [ 26.446943] Possible unsafe locking scenario: [ 26.446943] [ 26.452967] CPU0 [ 26.455518] ---- [ 26.458069] lock(&vq->mutex); [ 26.461325] lock(&vq->mutex); [ 26.464574] [ 26.464574] *** DEADLOCK *** [ 26.464574] [ 26.470600] May be due to missing lock nesting notation [ 26.470600] [ 26.477515] 1 lock held by syzkaller642612/3659: [ 26.482237] #0: (&vq->mutex){+.+.}, at: [<000000002c447cb8>] vhost_chr_write_iter+0x278/0x1580 [ 26.491140] [ 26.491140] stack backtrace: [ 26.495608] CPU: 1 PID: 3659 Comm: syzkaller642612 Not tainted 4.15.0-rc8-next-20180119+ #102 [ 26.504238] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.513561] Call Trace: [ 26.516130] dump_stack+0x194/0x257 [ 26.519751] ? arch_local_irq_restore+0x53/0x53 [ 26.524393] __lock_acquire+0xe8f/0x3e00 [ 26.528428] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.533591] ? get_kernel_page+0x110/0x110 [ 26.537804] ? __lru_cache_add+0x2a6/0x410 [ 26.542014] ? save_stack+0xa3/0xd0 [ 26.545614] ? print_irqtrace_events+0x270/0x270 [ 26.550343] ? __handle_mm_fault+0x1a0c/0x3ce0 [ 26.554900] ? mem_cgroup_css_online+0x2e0/0x2e0 [ 26.559629] ? check_noncircular+0x20/0x20 [ 26.563839] ? check_noncircular+0x20/0x20 [ 26.568046] ? mark_held_locks+0xaf/0x100 [ 26.572174] lock_acquire+0x1d5/0x580 [ 26.575945] ? lock_acquire+0x1d5/0x580 [ 26.579891] ? vhost_chr_write_iter+0x278/0x1580 [ 26.584618] ? lock_release+0xa40/0xa40 [ 26.588566] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.594421] ? do_raw_spin_trylock+0x190/0x190 [ 26.598985] ? rcu_note_context_switch+0x710/0x710 [ 26.603886] ? __might_sleep+0x95/0x190 [ 26.607835] ? vhost_chr_write_iter+0x278/0x1580 [ 26.612567] __mutex_lock+0x16f/0x1a80 [ 26.616426] ? vhost_chr_write_iter+0x278/0x1580 [ 26.621150] ? vhost_chr_write_iter+0x278/0x1580 [ 26.625875] ? __thp_get_unmapped_area+0x130/0x130 [ 26.630774] ? mutex_lock_io_nested+0x1900/0x1900 [ 26.635589] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 26.640752] ? find_held_lock+0x35/0x1d0 [ 26.644790] ? __might_fault+0x110/0x1d0 [ 26.648823] ? lock_downgrade+0x980/0x980 [ 26.652939] ? lock_release+0xa40/0xa40 [ 26.656883] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.662739] ? is_bpf_text_address+0x7b/0x120 [ 26.667207] ? __might_sleep+0x95/0x190 [ 26.671155] ? kasan_check_write+0x14/0x20 [ 26.675360] ? copyin+0x91/0xb0 [ 26.678610] ? _copy_from_iter+0x367/0xf30 [ 26.682815] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.687280] ? copy_page_to_iter+0xe00/0xe00 [ 26.691658] ? check_noncircular+0x20/0x20 [ 26.695865] mutex_lock_nested+0x16/0x20 [ 26.699894] ? mutex_lock_nested+0x16/0x20 [ 26.704097] vhost_chr_write_iter+0x278/0x1580 [ 26.708650] ? handle_mm_fault+0x2a0/0x930 [ 26.712857] ? match_held_lock+0x7f3/0x880 [ 26.717496] ? vhost_new_umem_range+0x740/0x740 [ 26.722136] ? __do_page_fault+0x5f7/0xc90 [ 26.726345] vhost_net_chr_write_iter+0x59/0x70 [ 26.730984] __vfs_write+0x684/0x970 [ 26.734671] ? kernel_read+0x120/0x120 [ 26.738527] ? _cond_resched+0x14/0x30 [ 26.742392] ? avc_policy_seqno+0x9/0x20 [ 26.746423] ? selinux_file_permission+0x82/0x460 [ 26.751235] ? rw_verify_area+0xe5/0x2b0 [ 26.755263] ? __fdget_raw+0x20/0x20 [ 26.758950] vfs_write+0x189/0x510 [ 26.762464] SyS_write+0xef/0x220 [ 26.765889] ? filp_open+0x70/0x70 [ 26.769399] ? SyS_read+0x220/0x220 [ 26.772997] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.777986] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.782722] entry_SYSCALL_64_fastpath+0x29/0xa0 [ 26.787457] RIP: 0033:0x43fd79 [ 26.790617] RSP: 002b:00007ffc9b885e78 EFLAGS: 00000203 ORIG_RAX: 0000000000000001 [ 26.798302] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd79 [ 26.805539] RDX: 0000000000000068 RSI: 0000000020baff98 RDI: 0000000000000003 [ 26.812779] RBP: 00000