[....] Starting enhanced syslogd: rsyslogd[ 14.747594] audit: type=1400 audit(1518328250.590:5): avc: denied { syslog } for pid=3942 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: [ 18.199943] audit: type=1400 audit(1518328254.042:6): avc: denied { map } for pid=4080 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 '10.128.15.205' (ECDSA) to the list of known hosts. executing program [ 24.453331] audit: type=1400 audit(1518328260.296:7): avc: denied { map } for pid=4094 comm="syzkaller382246" path="/root/syzkaller382246495" 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 [ 24.480228] [ 24.481931] ============================= [ 24.486108] WARNING: suspicious RCU usage [ 24.490275] 4.15.0+ #218 Not tainted [ 24.493995] ----------------------------- [ 24.498158] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.507431] [ 24.507431] other info that might help us debug this: [ 24.507431] [ 24.515581] [ 24.515581] rcu_scheduler_active = 2, debug_locks = 1 [ 24.522255] 1 lock held by syzkaller382246/4094: [ 24.527027] #0: (rcu_read_lock){....}, at: [<00000000184386aa>] __rds_conn_create+0xe46/0x1b50 [ 24.535990] [ 24.535990] stack backtrace: [ 24.540496] CPU: 1 PID: 4094 Comm: syzkaller382246 Not tainted 4.15.0+ #218 [ 24.547569] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.556892] Call Trace: [ 24.559455] dump_stack+0x194/0x257 [ 24.563068] ? arch_local_irq_restore+0x53/0x53 [ 24.567728] lockdep_rcu_suspicious+0x123/0x170 [ 24.572372] ___might_sleep+0x385/0x470 [ 24.576321] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.582186] ? __debug_object_init+0x235/0x1040 [ 24.586832] ? debug_mutex_init+0x1c/0x60 [ 24.590956] __might_sleep+0x95/0x190 [ 24.594736] kmem_cache_alloc_trace+0x299/0x740 [ 24.599378] ? lock_acquire+0x1d5/0x580 [ 24.603323] ? lock_acquire+0x1d5/0x580 [ 24.607271] ? __rds_conn_create+0xe46/0x1b50 [ 24.611748] rds_loop_conn_alloc+0xc8/0x380 [ 24.616044] ? rds_loop_conn_free+0x290/0x290 [ 24.620513] ? __init_waitqueue_head+0x97/0x140 [ 24.625164] ? rcutorture_record_progress+0x10/0x10 [ 24.630158] ? __lockdep_init_map+0xe4/0x650 [ 24.634543] __rds_conn_create+0x112f/0x1b50 [ 24.638943] ? rds_conn_drop+0xb0/0xb0 [ 24.642810] ? __raw_spin_lock_init+0x1c/0x100 [ 24.647366] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.652360] ? __lockdep_init_map+0xe4/0x650 [ 24.656742] ? lockdep_init_map+0x9/0x10 [ 24.660773] ? __init_waitqueue_head+0x97/0x140 [ 24.665414] ? init_wait_entry+0x1b0/0x1b0 [ 24.669624] ? lockdep_init_map+0x9/0x10 [ 24.673659] ? rds_message_alloc+0x28c/0x330 [ 24.678040] ? rds_message_next_extension+0x210/0x210 [ 24.683209] ? trace_hardirqs_on+0xd/0x10 [ 24.687334] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.691720] ? __release_sock+0x360/0x360 [ 24.695839] ? lock_sock_nested+0x91/0x110 [ 24.700052] rds_conn_create_outgoing+0x3f/0x50 [ 24.704696] rds_sendmsg+0xda3/0x2390 [ 24.708470] ? avc_has_perm+0x43e/0x680 [ 24.712429] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.716897] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.721368] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.726360] ? find_held_lock+0x35/0x1d0 [ 24.730405] ? sock_has_perm+0x2a4/0x420 [ 24.734439] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.739773] ? lock_release+0xa22/0xa40 [ 24.743720] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.749579] ? __check_object_size+0x8b/0x530 [ 24.754053] ? __might_sleep+0x95/0x190 [ 24.758003] ? selinux_socket_sendmsg+0x36/0x40 [ 24.762661] ? security_socket_sendmsg+0x89/0xb0 [ 24.767394] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.771866] sock_sendmsg+0xca/0x110 [ 24.775556] SYSC_sendto+0x361/0x5c0 [ 24.779248] ? SYSC_connect+0x4a0/0x4a0 [ 24.783198] ? find_held_lock+0x35/0x1d0 [ 24.787241] ? lock_downgrade+0x980/0x980 [ 24.791383] ? up_read+0x1a/0x40 [ 24.794722] ? __do_page_fault+0x3d6/0xc90 [ 24.798936] SyS_sendto+0x40/0x50 [ 24.802363] ? SyS_getpeername+0x30/0x30 [ 24.806400] do_fast_syscall_32+0x3ee/0xfa1 [ 24.810701] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.815254] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.819983] ? syscall_return_slowpath+0x550/0x550 [ 24.824886] ? syscall_return_slowpath+0x2ac/0x550 [ 24.829791] ? prepare_exit_to_usermode+0x350/0x350 [ 24.834782] ? retint_user+0x18/0x18 [ 24.838474] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.843298] entry_SYSENTER_compat+0x54/0x63 [ 24.847676] RIP: 0023:0xf7fb0c79 [ 24.851011] RSP: 002b:00000000ffb3d56c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 24.858700] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 24.865943] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020af3ff0 [ 24.873183] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 24.880428] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.887668] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.895217] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.902679] in_atomic(): 1, irqs_disabled(): 0, pid: 4094, name: syzkaller382246 [ 24.910229] 1 lock held by syzkaller382246/4094: [ 24.914982] #0: (rcu_read_lock){....}, at: [<00000000184386aa>] __rds_conn_create+0xe46/0x1b50 [ 24.923973] CPU: 1 PID: 4094 Comm: syzkaller382246 Not tainted 4.15.0+ #218 [ 24.931053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.940398] Call Trace: [ 24.942960] dump_stack+0x194/0x257 [ 24.946564] ? arch_local_irq_restore+0x53/0x53 [ 24.951207] ? print_lock+0x9f/0xa2 [ 24.954819] ? lockdep_print_held_locks+0xc4/0x130 [ 24.959729] ___might_sleep+0x2b2/0x470 [ 24.963679] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.969535] ? __debug_object_init+0x235/0x1040 [ 24.974176] ? debug_mutex_init+0x1c/0x60 [ 24.978300] __might_sleep+0x95/0x190 [ 24.982079] kmem_cache_alloc_trace+0x299/0x740 [ 24.986728] ? lock_acquire+0x1d5/0x580 [ 24.990675] ? lock_acquire+0x1d5/0x580 [ 24.994621] ? __rds_conn_create+0xe46/0x1b50 [ 24.999110] rds_loop_conn_alloc+0xc8/0x380 [ 25.003413] ? rds_loop_conn_free+0x290/0x290 [ 25.007886] ? __init_waitqueue_head+0x97/0x140 [ 25.012533] ? rcutorture_record_progress+0x10/0x10 [ 25.017525] ? __lockdep_init_map+0xe4/0x650 [ 25.021914] __rds_conn_create+0x112f/0x1b50 [ 25.026312] ? rds_conn_drop+0xb0/0xb0 [ 25.030180] ? __raw_spin_lock_init+0x1c/0x100 [ 25.034736] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.039732] ? __lockdep_init_map+0xe4/0x650 [ 25.044119] ? lockdep_init_map+0x9/0x10 [ 25.048152] ? __init_waitqueue_head+0x97/0x140 [ 25.052792] ? init_wait_entry+0x1b0/0x1b0 [ 25.057003] ? lockdep_init_map+0x9/0x10 [ 25.061041] ? rds_message_alloc+0x28c/0x330 [ 25.065423] ? rds_message_next_extension+0x210/0x210 [ 25.070585] ? trace_hardirqs_on+0xd/0x10 [ 25.074708] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.079113] ? __release_sock+0x360/0x360 [ 25.083236] ? lock_sock_nested+0x91/0x110 [ 25.087447] rds_conn_create_outgoing+0x3f/0x50 [ 25.092090] rds_sendmsg+0xda3/0x2390 [ 25.095865] ? avc_has_perm+0x43e/0x680 [ 25.099823] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.104292] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.108761] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.113750] ? find_held_lock+0x35/0x1d0 [ 25.117794] ? sock_has_perm+0x2a4/0x420 [ 25.121831] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.127173] ? lock_release+0xa22/0xa40 [ 25.131129] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.136988] ? __check_object_size+0x8b/0x530 [ 25.141461] ? __might_sleep+0x95/0x190 [ 25.145414] ? selinux_socket_sendmsg+0x36/0x40 [ 25.150057] ? security_socket_sendmsg+0x89/0xb0 [ 25.154788] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.159258] sock_sendmsg+0xca/0x110 [ 25.162947] SYSC_sendto+0x361/0x5c0 [ 25.166658] ? SYSC_connect+0x4a0/0x4a0 [ 25.170618] ? find_held_lock+0x35/0x1d0 [ 25.174665] ? lock_downgrade+0x980/0x980 [ 25.178808] ? up_read+0x1a/0x40 [ 25.182148] ? __do_page_fault+0x3d6/0xc90 [ 25.186365] SyS_sendto+0x40/0x50 [ 25.189793] ? SyS_getpeername+0x30/0x30 [ 25.193829] do_fast_syscall_32+0x3ee/0xfa1 [ 25.198138] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.202693] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.207428] ? syscall_return_slowpath+0x550/0x550 [ 25.212333] ? syscall_return_slowpath+0x2ac/0x550 [ 25.217235] ? prepare_exit_to_usermode+0x350/0x350 [ 25.222225] ? retint_user+0x18/0x18 [ 25.225914] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.230733] entry_SYSENTER_compat+0x54/0x63 [ 25.235113] RIP: 0023:0xf7fb0c79 [ 25.238445] RSP: 002b:00000000ffb3d56c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 25.246124] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 25.253365] RDX: 0000000000000000 RSI: