[....] Starting enhanced syslogd: rsyslogd[ 16.685365] audit: type=1400 audit(1518365805.244:5): avc: denied { syslog } for pid=4016 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: [ 21.749605] audit: type=1400 audit(1518365810.308:6): avc: denied { map } for pid=4155 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 '10.128.0.6' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 28.037444] audit: type=1400 audit(1518365816.596:7): avc: denied { map } for pid=4169 comm="syzkaller898803" path="/root/syzkaller898803947" 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 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 28.422461] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 28.750345] [ 28.752046] ============================= [ 28.756199] WARNING: suspicious RCU usage [ 28.760348] 4.15.0+ #222 Not tainted [ 28.764063] ----------------------------- [ 28.768238] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.777508] [ 28.777508] other info that might help us debug this: [ 28.777508] [ 28.785679] [ 28.785679] rcu_scheduler_active = 2, debug_locks = 1 [ 28.792358] 1 lock held by syzkaller898803/4169: [ 28.797111] #0: (rcu_read_lock){....}, at: [<0000000031b2c8b0>] __rds_conn_create+0xe46/0x1b50 [ 28.806062] [ 28.806062] stack backtrace: [ 28.810562] CPU: 0 PID: 4169 Comm: syzkaller898803 Not tainted 4.15.0+ #222 [ 28.817637] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.826963] Call Trace: [ 28.829527] dump_stack+0x194/0x257 [ 28.833130] ? arch_local_irq_restore+0x53/0x53 [ 28.837793] lockdep_rcu_suspicious+0x123/0x170 [ 28.842445] ___might_sleep+0x385/0x470 [ 28.846396] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.852253] ? debug_mutex_init+0x1c/0x60 [ 28.856376] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.861372] __might_sleep+0x95/0x190 [ 28.865151] kmem_cache_alloc+0x2a2/0x760 [ 28.869272] ? lock_acquire+0x1d5/0x580 [ 28.873220] ? __rds_conn_create+0xe46/0x1b50 [ 28.877690] ? SyS_membarrier+0x700/0x700 [ 28.881817] ? init_timer_key+0x163/0x3f0 [ 28.885940] rds_tcp_conn_alloc+0xa7/0x4e0 [ 28.890155] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 28.894535] ? rds_cmsg_atomic+0xff0/0xff0 [ 28.898746] ? __lockdep_init_map+0xe4/0x650 [ 28.903130] ? rds_cmsg_atomic+0xff0/0xff0 [ 28.907340] __rds_conn_create+0x112f/0x1b50 [ 28.911739] ? rds_conn_drop+0xb0/0xb0 [ 28.915612] ? __raw_spin_lock_init+0x1c/0x100 [ 28.920180] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.925174] ? __lockdep_init_map+0xe4/0x650 [ 28.929559] ? lockdep_init_map+0x9/0x10 [ 28.933593] ? __init_waitqueue_head+0x97/0x140 [ 28.938237] ? init_wait_entry+0x1b0/0x1b0 [ 28.942470] ? lockdep_init_map+0x9/0x10 [ 28.946515] ? rds_message_alloc+0x28c/0x330 [ 28.950906] ? rds_message_next_extension+0x210/0x210 [ 28.956070] ? trace_hardirqs_on+0xd/0x10 [ 28.960195] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.964581] ? __release_sock+0x360/0x360 [ 28.968712] ? lock_sock_nested+0x91/0x110 [ 28.972925] rds_conn_create_outgoing+0x3f/0x50 [ 28.977571] rds_sendmsg+0xda3/0x2390 [ 28.981344] ? avc_has_perm+0x43e/0x680 [ 28.985305] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.989773] ? release_sock+0x1d4/0x2a0 [ 28.993726] ? lock_downgrade+0x980/0x980 [ 28.997853] ? find_held_lock+0x35/0x1d0 [ 29.001898] ? sock_has_perm+0x2a4/0x420 [ 29.005935] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.011270] ? lock_release+0xa02/0xa40 [ 29.015219] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.021082] ? __check_object_size+0x8b/0x530 [ 29.025551] ? __release_sock+0x360/0x360 [ 29.029680] ? __might_sleep+0x95/0x190 [ 29.033631] ? selinux_socket_sendmsg+0x36/0x40 [ 29.038275] ? security_socket_sendmsg+0x89/0xb0 [ 29.043005] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.047485] sock_sendmsg+0xca/0x110 [ 29.051175] SYSC_sendto+0x361/0x5c0 [ 29.054864] ? SYSC_connect+0x4a0/0x4a0 [ 29.058819] ? security_socket_bind+0x89/0xb0 [ 29.063290] ? SYSC_bind+0x290/0x410 [ 29.067030] ? __do_page_fault+0x3d6/0xc90 [ 29.071251] ? mm_fault_error+0x2c0/0x2c0 [ 29.075373] ? move_addr_to_kernel+0x60/0x60 [ 29.079758] SyS_sendto+0x40/0x50 [ 29.083184] ? SyS_getpeername+0x30/0x30 [ 29.087220] do_syscall_64+0x282/0x940 [ 29.091079] ? __do_page_fault+0xc90/0xc90 [ 29.095284] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.100020] ? syscall_return_slowpath+0x550/0x550 [ 29.104927] ? syscall_return_slowpath+0x2ac/0x550 [ 29.109829] ? prepare_exit_to_usermode+0x350/0x350 [ 29.114821] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 29.120421] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.125245] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.130409] RIP: 0033:0x4451c9 [ 29.133570] RSP: 002b:00007ffe5faf3668 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.141258] RAX: ffffffffffffffda RBX: 00000000004a6a72 RCX: 00000000004451c9 [ 29.148499] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000004 [ 29.155743] RBP: 00007ffe5faf3788 R08: 000000002069affb R09: 0000000000000010 [ 29.162995] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffe5faf3788 [ 29.170240] R13: 0000000000402690 R14: 0000000000000000 R15: 0000000000000000 [ 29.177790] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 29.185242] in_atomic(): 1, irqs_disabled(): 0, pid: 4169, name: syzkaller898803 [ 29.192776] 1 lock held by syzkaller898803/4169: [ 29.197527] #0: (rcu_read_lock){....}, at: [<0000000031b2c8b0>] __rds_conn_create+0xe46/0x1b50 [ 29.206476] CPU: 0 PID: 4169 Comm: syzkaller898803 Not tainted 4.15.0+ #222 [ 29.213554] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.222879] Call Trace: [ 29.225445] dump_stack+0x194/0x257 [ 29.229060] ? arch_local_irq_restore+0x53/0x53 [ 29.233707] ? print_lock+0x9f/0xa2 [ 29.237308] ? lockdep_print_held_locks+0xc4/0x130 [ 29.242227] ___might_sleep+0x2b2/0x470 [ 29.246175] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.252036] ? debug_mutex_init+0x1c/0x60 [ 29.256162] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.261155] __might_sleep+0x95/0x190 [ 29.264934] kmem_cache_alloc+0x2a2/0x760 [ 29.269059] ? lock_acquire+0x1d5/0x580 [ 29.273014] ? __rds_conn_create+0xe46/0x1b50 [ 29.277491] ? SyS_membarrier+0x700/0x700 [ 29.281617] ? init_timer_key+0x163/0x3f0 [ 29.285745] rds_tcp_conn_alloc+0xa7/0x4e0 [ 29.289961] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 29.294348] ? rds_cmsg_atomic+0xff0/0xff0 [ 29.298558] ? __lockdep_init_map+0xe4/0x650 [ 29.302941] ? rds_cmsg_atomic+0xff0/0xff0 [ 29.307149] __rds_conn_create+0x112f/0x1b50 [ 29.311551] ? rds_conn_drop+0xb0/0xb0 [ 29.315419] ? __raw_spin_lock_init+0x1c/0x100 [ 29.319978] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.324971] ? __lockdep_init_map+0xe4/0x650 [ 29.329354] ? lockdep_init_map+0x9/0x10 [ 29.333388] ? __init_waitqueue_head+0x97/0x140 [ 29.338040] ? init_wait_entry+0x1b0/0x1b0 [ 29.342260] ? lockdep_init_map+0x9/0x10 [ 29.346296] ? rds_message_alloc+0x28c/0x330 [ 29.350677] ? rds_message_next_extension+0x210/0x210 [ 29.355839] ? trace_hardirqs_on+0xd/0x10 [ 29.359964] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.364350] ? __release_sock+0x360/0x360 [ 29.368467] ? lock_sock_nested+0x91/0x110 [ 29.372678] rds_conn_create_outgoing+0x3f/0x50 [ 29.377321] rds_sendmsg+0xda3/0x2390 [ 29.381095] ? avc_has_perm+0x43e/0x680 [ 29.385069] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.389535] ? release_sock+0x1d4/0x2a0 [ 29.393489] ? lock_downgrade+0x980/0x980 [ 29.397621] ? find_held_lock+0x35/0x1d0 [ 29.401666] ? sock_has_perm+0x2a4/0x420 [ 29.405701] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.411039] ? lock_release+0xa02/0xa40 [ 29.414987] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.420848] ? __check_object_size+0x8b/0x530 [ 29.425315] ? __release_sock+0x360/0x360 [ 29.429446] ? __might_sleep+0x95/0x190 [ 29.433401] ? selinux_socket_sendmsg+0x36/0x40 [ 29.438047] ? security_socket_sendmsg+0x89/0xb0 [ 29.442777] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.447257] sock_sendmsg+0xca/0x110 [ 29.450945] SYSC_sendto+0x361/0x5c0 [ 29.454636] ? SYSC_connect+0x4a0/0x4a0 [ 29.458595] ? security_socket_bind+0x89/0xb0 [ 29.463068] ? SYSC_bind+0x290/0x410 [ 29.466774] ? __do_page_fault+0x3d6/0xc90 [ 29.470988] ? mm_fault_error+0x2c0/0x2c0 [ 29.475111] ? move_addr_to_kernel+0x60/0x60 [ 29.479494] SyS_sendto+0x40/0x50 [ 29.482919] ? SyS_getpeername+0x30/0x30 [ 29.486957] do_syscall_64+0x282/0x940 [ 29.490815] ? __do_page_fault+0xc90/0xc90 [ 29.495030] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.499763] ? syscall_return_slowpath+0x550/0x550 [ 29.504663] ? syscall_return_slowpath+0x2ac/0x550 [ 29.509565] ? prepare_exit_to_usermode+0x350/0x350 [ 29.514556] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 29.519895] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.524714] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 29.529876] RIP: 0033:0x4451c9 [ 29.533041] RSP: 002b:00007ffe5faf3668 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.540727] RAX: ffffffffffffffda RBX: 00000000004a6a72 RCX: 00000000004451c9 [ 29.547972] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 000000