[....] Starting enhanced syslogd: rsyslogd[ 16.394185] audit: type=1400 audit(1518435855.486:5): avc: denied { syslog } for pid=4027 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 18.489572] audit: type=1400 audit(1518435857.581:6): avc: denied { map } for pid=4163 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 '10.128.0.54' (ECDSA) to the list of known hosts. executing program [ 24.760543] audit: type=1400 audit(1518435863.852:7): avc: denied { map } for pid=4177 comm="syzkaller706094" path="/root/syzkaller706094437" 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 [ 24.787564] [ 24.789257] ============================= [ 24.793424] WARNING: suspicious RCU usage [ 24.797585] 4.16.0-rc1+ #219 Not tainted [ 24.801652] ----------------------------- [ 24.805824] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.815093] [ 24.815093] other info that might help us debug this: [ 24.815093] [ 24.823241] [ 24.823241] rcu_scheduler_active = 2, debug_locks = 1 [ 24.829912] 1 lock held by syzkaller706094/4177: [ 24.834667] #0: (rcu_read_lock){....}, at: [<00000000dd20c2b6>] __rds_conn_create+0xe46/0x1b50 [ 24.843617] [ 24.843617] stack backtrace: [ 24.848121] CPU: 1 PID: 4177 Comm: syzkaller706094 Not tainted 4.16.0-rc1+ #219 [ 24.855544] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.864869] Call Trace: [ 24.867436] dump_stack+0x194/0x257 [ 24.871039] ? arch_local_irq_restore+0x53/0x53 [ 24.875696] lockdep_rcu_suspicious+0x123/0x170 [ 24.880340] ___might_sleep+0x385/0x470 [ 24.884287] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.890141] ? __debug_object_init+0x235/0x1040 [ 24.894782] ? lock_acquire+0x1d5/0x580 [ 24.898730] ? debug_mutex_init+0x1c/0x60 [ 24.902857] __might_sleep+0x95/0x190 [ 24.906637] kmem_cache_alloc_trace+0x299/0x740 [ 24.911288] ? lock_acquire+0x1d5/0x580 [ 24.915234] ? lock_acquire+0x1d5/0x580 [ 24.919182] ? __rds_conn_create+0xe46/0x1b50 [ 24.923663] rds_loop_conn_alloc+0xc8/0x380 [ 24.927964] ? rds_loop_conn_free+0x290/0x290 [ 24.932432] ? __init_waitqueue_head+0x97/0x140 [ 24.937084] ? rcutorture_record_progress+0x10/0x10 [ 24.942074] ? __lockdep_init_map+0xe4/0x650 [ 24.946460] __rds_conn_create+0x112f/0x1b50 [ 24.950858] ? rds_conn_drop+0xb0/0xb0 [ 24.954727] ? __raw_spin_lock_init+0x1c/0x100 [ 24.959281] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.964274] ? __lockdep_init_map+0xe4/0x650 [ 24.968661] ? lockdep_init_map+0x9/0x10 [ 24.972695] ? __init_waitqueue_head+0x97/0x140 [ 24.977337] ? init_wait_entry+0x1b0/0x1b0 [ 24.981547] ? lockdep_init_map+0x9/0x10 [ 24.985585] ? rds_message_alloc+0x28c/0x330 [ 24.989966] ? rds_message_next_extension+0x210/0x210 [ 24.995126] ? trace_hardirqs_on+0xd/0x10 [ 24.999250] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.003635] ? __release_sock+0x360/0x360 [ 25.007752] ? lock_sock_nested+0x91/0x110 [ 25.011964] rds_conn_create_outgoing+0x3f/0x50 [ 25.016607] rds_sendmsg+0xda3/0x2390 [ 25.020379] ? avc_has_perm+0x43e/0x680 [ 25.024358] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.028835] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.033318] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.038310] ? find_held_lock+0x35/0x1d0 [ 25.042353] ? sock_has_perm+0x2a4/0x420 [ 25.046389] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.051723] ? lock_release+0xa22/0xa40 [ 25.055668] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.061532] ? __check_object_size+0x8b/0x530 [ 25.066011] ? __might_sleep+0x95/0x190 [ 25.069961] ? selinux_socket_sendmsg+0x36/0x40 [ 25.074601] ? security_socket_sendmsg+0x89/0xb0 [ 25.079334] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.083802] sock_sendmsg+0xca/0x110 [ 25.087492] SYSC_sendto+0x361/0x5c0 [ 25.091187] ? SYSC_connect+0x4a0/0x4a0 [ 25.095142] ? find_held_lock+0x35/0x1d0 [ 25.099194] ? lock_downgrade+0x980/0x980 [ 25.103338] ? up_read+0x1a/0x40 [ 25.106677] ? __do_page_fault+0x3d6/0xc90 [ 25.110894] SyS_sendto+0x40/0x50 [ 25.114322] ? SyS_getpeername+0x30/0x30 [ 25.118364] do_fast_syscall_32+0x3ee/0xfa1 [ 25.122663] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.127218] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.132727] ? syscall_return_slowpath+0x550/0x550 [ 25.137628] ? syscall_return_slowpath+0x2ac/0x550 [ 25.142537] ? retint_user+0x18/0x18 [ 25.146230] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.151050] entry_SYSENTER_compat+0x54/0x63 [ 25.155427] RIP: 0023:0xf7f5ac79 [ 25.158760] RSP: 002b:00000000ffa0b5fc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 25.166438] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020141fb9 [ 25.173681] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002069affb [ 25.180920] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 25.188163] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.195402] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.202705] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.210172] in_atomic(): 1, irqs_disabled(): 0, pid: 4177, name: syzkaller706094 [ 25.217716] 1 lock held by syzkaller706094/4177: [ 25.222473] #0: (rcu_read_lock){....}, at: [<00000000dd20c2b6>] __rds_conn_create+0xe46/0x1b50 [ 25.231431] CPU: 1 PID: 4177 Comm: syzkaller706094 Not tainted 4.16.0-rc1+ #219 [ 25.238857] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.248182] Call Trace: [ 25.250744] dump_stack+0x194/0x257 [ 25.254348] ? arch_local_irq_restore+0x53/0x53 [ 25.258992] ? print_lock+0x9f/0xa2 [ 25.262604] ? lockdep_print_held_locks+0xc4/0x130 [ 25.267520] ___might_sleep+0x2b2/0x470 [ 25.271466] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.277323] ? __debug_object_init+0x235/0x1040 [ 25.281964] ? lock_acquire+0x1d5/0x580 [ 25.285915] ? debug_mutex_init+0x1c/0x60 [ 25.290043] __might_sleep+0x95/0x190 [ 25.293823] kmem_cache_alloc_trace+0x299/0x740 [ 25.298469] ? lock_acquire+0x1d5/0x580 [ 25.302428] ? lock_acquire+0x1d5/0x580 [ 25.306377] ? __rds_conn_create+0xe46/0x1b50 [ 25.310848] rds_loop_conn_alloc+0xc8/0x380 [ 25.315142] ? rds_loop_conn_free+0x290/0x290 [ 25.319610] ? __init_waitqueue_head+0x97/0x140 [ 25.324253] ? rcutorture_record_progress+0x10/0x10 [ 25.329246] ? __lockdep_init_map+0xe4/0x650 [ 25.333629] __rds_conn_create+0x112f/0x1b50 [ 25.338027] ? rds_conn_drop+0xb0/0xb0 [ 25.341902] ? __raw_spin_lock_init+0x1c/0x100 [ 25.346458] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.351455] ? __lockdep_init_map+0xe4/0x650 [ 25.355837] ? lockdep_init_map+0x9/0x10 [ 25.359871] ? __init_waitqueue_head+0x97/0x140 [ 25.364511] ? init_wait_entry+0x1b0/0x1b0 [ 25.368724] ? lockdep_init_map+0x9/0x10 [ 25.372764] ? rds_message_alloc+0x28c/0x330 [ 25.377147] ? rds_message_next_extension+0x210/0x210 [ 25.382307] ? trace_hardirqs_on+0xd/0x10 [ 25.386430] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.390816] ? __release_sock+0x360/0x360 [ 25.394934] ? lock_sock_nested+0x91/0x110 [ 25.399145] rds_conn_create_outgoing+0x3f/0x50 [ 25.403788] rds_sendmsg+0xda3/0x2390 [ 25.407565] ? avc_has_perm+0x43e/0x680 [ 25.411523] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.415989] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.420457] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.425452] ? find_held_lock+0x35/0x1d0 [ 25.429495] ? sock_has_perm+0x2a4/0x420 [ 25.433530] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.438864] ? lock_release+0xa22/0xa40 [ 25.442813] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.448670] ? __check_object_size+0x8b/0x530 [ 25.453142] ? __might_sleep+0x95/0x190 [ 25.457093] ? selinux_socket_sendmsg+0x36/0x40 [ 25.461735] ? security_socket_sendmsg+0x89/0xb0 [ 25.466465] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.470936] sock_sendmsg+0xca/0x110 [ 25.474626] SYSC_sendto+0x361/0x5c0 [ 25.478314] ? SYSC_connect+0x4a0/0x4a0 [ 25.482265] ? find_held_lock+0x35/0x1d0 [ 25.486317] ? lock_downgrade+0x980/0x980 [ 25.490458] ? up_read+0x1a/0x40 [ 25.493803] ? __do_page_fault+0x3d6/0xc90 [ 25.498018] SyS_sendto+0x40/0x50 [ 25.501447] ? SyS_getpeername+0x30/0x30 [ 25.505482] do_fast_syscall_32+0x3ee/0xfa1 [ 25.509782] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.514353] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.519866] ? syscall_return_slowpath+0x550/0x550 [ 25.524767] ? syscall_return_slowpath+0x2ac/0x550 [ 25.529690] ? retint_user+0x18/0x18 [ 25.533390] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.538218] entry_SYSENTER_compat+0x54/0x63 [ 25.542597] RIP: 0023:0xf7f5ac79 [ 25.545938] RSP: 002b:00000000ffa0b5fc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 25.553618] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020141fb9 [ 25.560859] RDX: 0000000000000000 RSI