[ 15.858009] audit: type=1400 audit(1518373497.601:5): avc: denied { syslog } for pid=3995 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [....] Starting enhanced syslogd: rsyslogd[?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: [ 18.136879] audit: type=1400 audit(1518373499.880:6): avc: denied { map } for pid=4138 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 '10.128.15.227' (ECDSA) to the list of known hosts. executing program [ 24.508688] audit: type=1400 audit(1518373506.252:7): avc: denied { map } for pid=4152 comm="syzkaller796138" path="/root/syzkaller796138829" 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 [ 24.534855] [ 24.536734] ============================= [ 24.540891] WARNING: suspicious RCU usage [ 24.545060] 4.15.0+ #218 Not tainted [ 24.548781] ----------------------------- [ 24.552941] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.562242] [ 24.562242] other info that might help us debug this: [ 24.562242] [ 24.570391] [ 24.570391] rcu_scheduler_active = 2, debug_locks = 1 [ 24.577066] 1 lock held by syzkaller796138/4152: [ 24.581824] #0: (rcu_read_lock){....}, at: [<0000000002d37744>] __rds_conn_create+0xe46/0x1b50 [ 24.590792] [ 24.590792] stack backtrace: [ 24.595299] CPU: 0 PID: 4152 Comm: syzkaller796138 Not tainted 4.15.0+ #218 [ 24.602372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.611697] Call Trace: [ 24.614258] dump_stack+0x194/0x257 [ 24.617860] ? arch_local_irq_restore+0x53/0x53 [ 24.622514] lockdep_rcu_suspicious+0x123/0x170 [ 24.627158] ___might_sleep+0x385/0x470 [ 24.631107] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.636960] ? __debug_object_init+0x235/0x1040 [ 24.641601] ? debug_mutex_init+0x1c/0x60 [ 24.645724] __might_sleep+0x95/0x190 [ 24.649503] kmem_cache_alloc_trace+0x299/0x740 [ 24.654143] ? lock_acquire+0x1d5/0x580 [ 24.658088] ? lock_acquire+0x1d5/0x580 [ 24.662038] ? __rds_conn_create+0xe46/0x1b50 [ 24.666510] rds_loop_conn_alloc+0xc8/0x380 [ 24.670808] ? rds_loop_conn_free+0x290/0x290 [ 24.675276] ? __init_waitqueue_head+0x97/0x140 [ 24.679923] ? rcutorture_record_progress+0x10/0x10 [ 24.684912] ? __lockdep_init_map+0xe4/0x650 [ 24.689297] __rds_conn_create+0x112f/0x1b50 [ 24.693695] ? rds_conn_drop+0xb0/0xb0 [ 24.697564] ? __raw_spin_lock_init+0x1c/0x100 [ 24.702130] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.707124] ? __lockdep_init_map+0xe4/0x650 [ 24.711506] ? lockdep_init_map+0x9/0x10 [ 24.715539] ? __init_waitqueue_head+0x97/0x140 [ 24.720186] ? init_wait_entry+0x1b0/0x1b0 [ 24.724408] ? lockdep_init_map+0x9/0x10 [ 24.728447] ? rds_message_alloc+0x28c/0x330 [ 24.732840] ? rds_message_next_extension+0x210/0x210 [ 24.738003] ? trace_hardirqs_on+0xd/0x10 [ 24.742128] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.746515] ? __release_sock+0x360/0x360 [ 24.750635] ? lock_sock_nested+0x91/0x110 [ 24.754851] rds_conn_create_outgoing+0x3f/0x50 [ 24.759500] rds_sendmsg+0xda3/0x2390 [ 24.763273] ? avc_has_perm+0x43e/0x680 [ 24.767237] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.771705] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.776180] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.781177] ? find_held_lock+0x35/0x1d0 [ 24.785220] ? sock_has_perm+0x2a4/0x420 [ 24.789261] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.794599] ? lock_release+0xa22/0xa40 [ 24.798547] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.804407] ? __check_object_size+0x8b/0x530 [ 24.808880] ? __might_sleep+0x95/0x190 [ 24.812830] ? selinux_socket_sendmsg+0x36/0x40 [ 24.817475] ? security_socket_sendmsg+0x89/0xb0 [ 24.822205] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.826677] sock_sendmsg+0xca/0x110 [ 24.830371] SYSC_sendto+0x361/0x5c0 [ 24.834064] ? SYSC_connect+0x4a0/0x4a0 [ 24.838027] ? schedule+0xf5/0x430 [ 24.841537] ? SYSC_bind+0x290/0x410 [ 24.845248] ? exit_to_usermode_loop+0x8c/0x2f0 [ 24.849900] ? trace_hardirqs_off+0xd/0x10 [ 24.854111] ? exit_to_usermode_loop+0x198/0x2f0 [ 24.858845] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.864362] SyS_sendto+0x40/0x50 [ 24.867792] ? SyS_getpeername+0x30/0x30 [ 24.871830] do_fast_syscall_32+0x3ee/0xfa1 [ 24.876131] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.880686] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.885418] ? syscall_return_slowpath+0x550/0x550 [ 24.890319] ? syscall_return_slowpath+0x2ac/0x550 [ 24.895233] ? prepare_exit_to_usermode+0x350/0x350 [ 24.900227] ? sysret32_from_system_call+0x5/0x3b [ 24.905057] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.909886] entry_SYSENTER_compat+0x54/0x63 [ 24.914266] RIP: 0023:0xf7f2ec79 [ 24.917603] RSP: 002b:00000000ffaaf8ec EFLAGS: 00000282 ORIG_RAX: 0000000000000171 [ 24.925282] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020c15000 [ 24.932522] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020062000 [ 24.939764] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 24.947007] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.954250] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.961556] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.969029] in_atomic(): 1, irqs_disabled(): 0, pid: 4152, name: syzkaller796138 [ 24.976570] 1 lock held by syzkaller796138/4152: [ 24.981328] #0: (rcu_read_lock){....}, at: [<0000000002d37744>] __rds_conn_create+0xe46/0x1b50 [ 24.990289] CPU: 0 PID: 4152 Comm: syzkaller796138 Not tainted 4.15.0+ #218 [ 24.997371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.006698] Call Trace: [ 25.009260] dump_stack+0x194/0x257 [ 25.012864] ? arch_local_irq_restore+0x53/0x53 [ 25.017506] ? print_lock+0x9f/0xa2 [ 25.021108] ? lockdep_print_held_locks+0xc4/0x130 [ 25.026026] ___might_sleep+0x2b2/0x470 [ 25.029982] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.035838] ? __debug_object_init+0x235/0x1040 [ 25.040481] ? debug_mutex_init+0x1c/0x60 [ 25.044606] __might_sleep+0x95/0x190 [ 25.048387] kmem_cache_alloc_trace+0x299/0x740 [ 25.053033] ? lock_acquire+0x1d5/0x580 [ 25.056983] ? lock_acquire+0x1d5/0x580 [ 25.060931] ? __rds_conn_create+0xe46/0x1b50 [ 25.065404] rds_loop_conn_alloc+0xc8/0x380 [ 25.069699] ? rds_loop_conn_free+0x290/0x290 [ 25.074170] ? __init_waitqueue_head+0x97/0x140 [ 25.078813] ? rcutorture_record_progress+0x10/0x10 [ 25.083804] ? __lockdep_init_map+0xe4/0x650 [ 25.088191] __rds_conn_create+0x112f/0x1b50 [ 25.092593] ? rds_conn_drop+0xb0/0xb0 [ 25.096462] ? __raw_spin_lock_init+0x1c/0x100 [ 25.101020] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.106021] ? __lockdep_init_map+0xe4/0x650 [ 25.110423] ? lockdep_init_map+0x9/0x10 [ 25.114455] ? __init_waitqueue_head+0x97/0x140 [ 25.119097] ? init_wait_entry+0x1b0/0x1b0 [ 25.123309] ? lockdep_init_map+0x9/0x10 [ 25.127346] ? rds_message_alloc+0x28c/0x330 [ 25.131727] ? rds_message_next_extension+0x210/0x210 [ 25.136888] ? trace_hardirqs_on+0xd/0x10 [ 25.141015] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.145401] ? __release_sock+0x360/0x360 [ 25.149525] ? lock_sock_nested+0x91/0x110 [ 25.153764] rds_conn_create_outgoing+0x3f/0x50 [ 25.158416] rds_sendmsg+0xda3/0x2390 [ 25.162190] ? avc_has_perm+0x43e/0x680 [ 25.166188] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.170664] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.175135] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.180130] ? find_held_lock+0x35/0x1d0 [ 25.184177] ? sock_has_perm+0x2a4/0x420 [ 25.188211] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.193544] ? lock_release+0xa22/0xa40 [ 25.197490] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.203345] ? __check_object_size+0x8b/0x530 [ 25.207821] ? __might_sleep+0x95/0x190 [ 25.211773] ? selinux_socket_sendmsg+0x36/0x40 [ 25.216414] ? security_socket_sendmsg+0x89/0xb0 [ 25.221148] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.225617] sock_sendmsg+0xca/0x110 [ 25.229306] SYSC_sendto+0x361/0x5c0 [ 25.233001] ? SYSC_connect+0x4a0/0x4a0 [ 25.236963] ? schedule+0xf5/0x430 [ 25.240475] ? SYSC_bind+0x290/0x410 [ 25.244179] ? exit_to_usermode_loop+0x8c/0x2f0 [ 25.248825] ? trace_hardirqs_off+0xd/0x10 [ 25.253036] ? exit_to_usermode_loop+0x198/0x2f0 [ 25.257765] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.263280] SyS_sendto+0x40/0x50 [ 25.266709] ? SyS_getpeername+0x30/0x30 [ 25.270743] do_fast_syscall_32+0x3ee/0xfa1 [ 25.275042] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.279598] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.284327] ? syscall_return_slowpath+0x550/0x550 [ 25.289230] ? syscall_return_slowpath+0x2ac/0x550 [ 25.294135] ? prepare_exit_to_usermode+0x350/0x350 [ 25.299131] ? sysret32_from_system_call+0x5/0x3b [ 25.303953] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.308785] entry_SYSENTER_compat+0x54