[....] Starting enhanced syslogd: rsyslogd[ 16.789886] audit: type=1400 audit(1518872030.440:5): avc: denied { syslog } for pid=4056 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: [ 19.331585] audit: type=1400 audit(1518872032.982:6): avc: denied { map } for pid=4195 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 '10.128.15.210' (ECDSA) to the list of known hosts. executing program [ 25.607655] audit: type=1400 audit(1518872039.258:7): avc: denied { map } for pid=4209 comm="syzkaller109928" path="/root/syzkaller109928471" 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 [ 25.635949] [ 25.637678] ============================= [ 25.641852] WARNING: suspicious RCU usage [ 25.646035] 4.16.0-rc1+ #226 Not tainted [ 25.650107] ----------------------------- [ 25.654266] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.663569] [ 25.663569] other info that might help us debug this: [ 25.663569] [ 25.671731] [ 25.671731] rcu_scheduler_active = 2, debug_locks = 1 [ 25.678411] 1 lock held by syzkaller109928/4209: [ 25.683172] #0: (rcu_read_lock){....}, at: [<0000000038dcde14>] __rds_conn_create+0xe46/0x1b50 [ 25.692131] [ 25.692131] stack backtrace: [ 25.696643] CPU: 1 PID: 4209 Comm: syzkaller109928 Not tainted 4.16.0-rc1+ #226 [ 25.704076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.713420] Call Trace: [ 25.715991] dump_stack+0x194/0x257 [ 25.719598] ? arch_local_irq_restore+0x53/0x53 [ 25.724253] lockdep_rcu_suspicious+0x123/0x170 [ 25.728900] ___might_sleep+0x385/0x470 [ 25.732851] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.738709] ? __debug_object_init+0x235/0x1040 [ 25.743351] ? lock_acquire+0x1d5/0x580 [ 25.747300] ? debug_mutex_init+0x1c/0x60 [ 25.751427] __might_sleep+0x95/0x190 [ 25.755207] kmem_cache_alloc_trace+0x299/0x740 [ 25.759853] ? lock_acquire+0x1d5/0x580 [ 25.763802] ? lock_acquire+0x1d5/0x580 [ 25.767756] ? __rds_conn_create+0xe46/0x1b50 [ 25.772231] rds_loop_conn_alloc+0xc8/0x380 [ 25.776528] ? rds_loop_conn_free+0x290/0x290 [ 25.780999] ? __init_waitqueue_head+0x97/0x140 [ 25.785646] ? rcutorture_record_progress+0x10/0x10 [ 25.790639] ? __lockdep_init_map+0xe4/0x650 [ 25.795029] __rds_conn_create+0x112f/0x1b50 [ 25.799434] ? rds_conn_drop+0xb0/0xb0 [ 25.803297] ? find_held_lock+0x35/0x1d0 [ 25.807332] ? retint_kernel+0x10/0x10 [ 25.811195] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.816187] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.820931] ? retint_kernel+0x10/0x10 [ 25.824809] ? copy_user_enhanced_fast_string+0xe/0x20 [ 25.830063] ? copyin+0x91/0xb0 [ 25.833317] ? copy_page_from_iter+0x50e/0x7c0 [ 25.837879] ? _copy_from_iter+0xf30/0xf30 [ 25.842094] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.846482] ? rds_message_copy_from_user+0x29e/0x370 [ 25.851649] rds_conn_create_outgoing+0x3f/0x50 [ 25.856301] rds_sendmsg+0xda3/0x2390 [ 25.860080] ? avc_has_perm+0x43e/0x680 [ 25.864069] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.868549] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.873020] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.878016] ? find_held_lock+0x35/0x1d0 [ 25.882066] ? sock_has_perm+0x2a4/0x420 [ 25.886104] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.891441] ? lock_release+0x9a2/0xa40 [ 25.895390] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.901253] ? __check_object_size+0x8b/0x530 [ 25.905730] ? __might_sleep+0x95/0x190 [ 25.909684] ? selinux_socket_sendmsg+0x36/0x40 [ 25.914331] ? security_socket_sendmsg+0x89/0xb0 [ 25.919066] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.923540] sock_sendmsg+0xca/0x110 [ 25.927231] SYSC_sendto+0x361/0x5c0 [ 25.930922] ? SYSC_connect+0x4a0/0x4a0 [ 25.934876] ? find_held_lock+0x35/0x1d0 [ 25.938923] ? lock_downgrade+0x980/0x980 [ 25.943064] ? up_read+0x1a/0x40 [ 25.946409] ? __do_page_fault+0x3d6/0xc90 [ 25.950630] SyS_sendto+0x40/0x50 [ 25.954060] ? SyS_getpeername+0x30/0x30 [ 25.958099] do_fast_syscall_32+0x3ec/0xf9f [ 25.962423] ? do_int80_syscall_32+0x9c0/0x9c0 [ 25.967001] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.971740] ? syscall_return_slowpath+0x550/0x550 [ 25.976646] ? syscall_return_slowpath+0x2ac/0x550 [ 25.981551] ? prepare_exit_to_usermode+0x350/0x350 [ 25.986546] ? retint_user+0x18/0x18 [ 25.990238] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.995065] entry_SYSENTER_compat+0x70/0x7f [ 25.999454] RIP: 0023:0xf7ff8c79 [ 26.002792] RSP: 002b:00000000ffe3bdbc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 26.010471] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dbf000 [ 26.017715] RDX: 00000000000001c1 RSI: 0000000000000000 RDI: 0000000020b2d000 [ 26.024957] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 26.032209] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 26.039450] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 26.046761] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.054229] in_atomic(): 1, irqs_disabled(): 0, pid: 4209, name: syzkaller109928 [ 26.061803] 1 lock held by syzkaller109928/4209: [ 26.066592] #0: (rcu_read_lock){....}, at: [<0000000038dcde14>] __rds_conn_create+0xe46/0x1b50 [ 26.075576] CPU: 1 PID: 4209 Comm: syzkaller109928 Not tainted 4.16.0-rc1+ #226 [ 26.083013] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.092352] Call Trace: [ 26.094938] dump_stack+0x194/0x257 [ 26.098544] ? arch_local_irq_restore+0x53/0x53 [ 26.103194] ? print_lock+0x9f/0xa2 [ 26.106793] ? lockdep_print_held_locks+0xc4/0x130 [ 26.111706] ___might_sleep+0x2b2/0x470 [ 26.115657] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.121517] ? __debug_object_init+0x235/0x1040 [ 26.126158] ? lock_acquire+0x1d5/0x580 [ 26.130108] ? debug_mutex_init+0x1c/0x60 [ 26.134234] __might_sleep+0x95/0x190 [ 26.138019] kmem_cache_alloc_trace+0x299/0x740 [ 26.142667] ? lock_acquire+0x1d5/0x580 [ 26.146619] ? lock_acquire+0x1d5/0x580 [ 26.150573] ? __rds_conn_create+0xe46/0x1b50 [ 26.155059] rds_loop_conn_alloc+0xc8/0x380 [ 26.159363] ? rds_loop_conn_free+0x290/0x290 [ 26.163833] ? __init_waitqueue_head+0x97/0x140 [ 26.168479] ? rcutorture_record_progress+0x10/0x10 [ 26.173473] ? __lockdep_init_map+0xe4/0x650 [ 26.177862] __rds_conn_create+0x112f/0x1b50 [ 26.182263] ? rds_conn_drop+0xb0/0xb0 [ 26.186123] ? find_held_lock+0x35/0x1d0 [ 26.190161] ? retint_kernel+0x10/0x10 [ 26.194027] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.199030] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.203774] ? retint_kernel+0x10/0x10 [ 26.207647] ? copy_user_enhanced_fast_string+0xe/0x20 [ 26.212905] ? copyin+0x91/0xb0 [ 26.216162] ? copy_page_from_iter+0x50e/0x7c0 [ 26.220725] ? _copy_from_iter+0xf30/0xf30 [ 26.224936] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.229325] ? rds_message_copy_from_user+0x29e/0x370 [ 26.234491] rds_conn_create_outgoing+0x3f/0x50 [ 26.239140] rds_sendmsg+0xda3/0x2390 [ 26.242913] ? avc_has_perm+0x43e/0x680 [ 26.246875] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.251345] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.255819] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.260812] ? find_held_lock+0x35/0x1d0 [ 26.264856] ? sock_has_perm+0x2a4/0x420 [ 26.268891] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.274230] ? lock_release+0x9a2/0xa40 [ 26.278181] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.284043] ? __check_object_size+0x8b/0x530 [ 26.288520] ? __might_sleep+0x95/0x190 [ 26.292476] ? selinux_socket_sendmsg+0x36/0x40 [ 26.297121] ? security_socket_sendmsg+0x89/0xb0 [ 26.301853] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.306414] sock_sendmsg+0xca/0x110 [ 26.310105] SYSC_sendto+0x361/0x5c0 [ 26.313799] ? SYSC_connect+0x4a0/0x4a0 [ 26.317753] ? find_held_lock+0x35/0x1d0 [ 26.321800] ? lock_downgrade+0x980/0x980 [ 26.325945] ? up_read+0x1a/0x40 [ 26.329289] ? __do_page_fault+0x3d6/0xc90 [ 26.333511] SyS_sendto+0x40/0x50 [ 26.336941] ? SyS_getpeername+0x30/0x30 [ 26.340980] do_fast_syscall_32+0x3ec/0xf9f [ 26.345285] ? do_int80_syscall_32+0x9c0/0x9c0 [ 26.349843] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.354578] ? syscall_return_slowpath+0x550/0x550 [ 26.359485] ? syscall_return_slowpath+0x2ac/0x550 [ 26.364392] ? prepare_exit_to_usermode+0x350/0x350 [ 26.369387] ? retint_user+0x18/0x18 [ 26.373081] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.377906] entry_SYSENTER_compat+0x70/0x7f [ 26.382288] RIP: 0023:0xf7ff8c79 [ 26.385627] RSP: 002b:00000000ffe3bdbc EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 26.393308] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020dbf000 [ 26.400555] RDX: 00000000000001c1 RSI: 0000000000000000 RDI: 0000000020b2d000 [ 26.407798] RBP: 0000000000000010 R08: 0