[....] Starting enhanced syslogd: rsyslogd[ 15.744580] audit: type=1400 audit(1518428046.394:5): avc: denied { syslog } for pid=3998 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: [ 18.918518] audit: type=1400 audit(1518428049.568:6): avc: denied { map } for pid=4136 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 '10.128.0.47' (ECDSA) to the list of known hosts. executing program [ 25.162667] audit: type=1400 audit(1518428055.812:7): avc: denied { map } for pid=4150 comm="syzkaller002261" path="/root/syzkaller002261281" 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 [ 25.189487] [ 25.191165] ============================= [ 25.195310] WARNING: suspicious RCU usage [ 25.199452] 4.16.0-rc1+ #309 Not tainted [ 25.203510] ----------------------------- [ 25.207658] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.216951] [ 25.216951] other info that might help us debug this: [ 25.216951] [ 25.225096] [ 25.225096] rcu_scheduler_active = 2, debug_locks = 1 [ 25.231770] 1 lock held by syzkaller002261/4150: [ 25.236517] #0: (rcu_read_lock){....}, at: [<00000000807766fa>] __rds_conn_create+0xe46/0x1b50 [ 25.245453] [ 25.245453] stack backtrace: [ 25.249961] CPU: 1 PID: 4150 Comm: syzkaller002261 Not tainted 4.16.0-rc1+ #309 [ 25.257381] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.266705] Call Trace: [ 25.269266] dump_stack+0x194/0x257 [ 25.272870] ? arch_local_irq_restore+0x53/0x53 [ 25.277525] lockdep_rcu_suspicious+0x123/0x170 [ 25.282169] ___might_sleep+0x385/0x470 [ 25.286123] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.291983] ? __debug_object_init+0x235/0x1040 [ 25.296623] ? debug_mutex_init+0x1c/0x60 [ 25.300748] __might_sleep+0x95/0x190 [ 25.304525] kmem_cache_alloc_trace+0x299/0x740 [ 25.309166] ? lock_acquire+0x1d5/0x580 [ 25.313113] ? lock_acquire+0x1d5/0x580 [ 25.317065] ? __rds_conn_create+0xe46/0x1b50 [ 25.321535] rds_loop_conn_alloc+0xc8/0x380 [ 25.325828] ? rds_loop_conn_free+0x290/0x290 [ 25.330295] ? __init_waitqueue_head+0x97/0x140 [ 25.334938] ? rcutorture_record_progress+0x10/0x10 [ 25.339926] ? __lockdep_init_map+0xe4/0x650 [ 25.344312] __rds_conn_create+0x112f/0x1b50 [ 25.348719] ? rds_conn_drop+0xb0/0xb0 [ 25.352587] ? __raw_spin_lock_init+0x1c/0x100 [ 25.357144] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.362137] ? __lockdep_init_map+0xe4/0x650 [ 25.366520] ? lockdep_init_map+0x9/0x10 [ 25.370553] ? __init_waitqueue_head+0x97/0x140 [ 25.375194] ? init_wait_entry+0x1b0/0x1b0 [ 25.379406] ? lockdep_init_map+0x9/0x10 [ 25.383443] ? rds_message_alloc+0x28c/0x330 [ 25.387821] ? rds_message_next_extension+0x210/0x210 [ 25.392981] ? trace_hardirqs_on+0xd/0x10 [ 25.397106] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.401493] ? __release_sock+0x360/0x360 [ 25.405614] ? lock_sock_nested+0x91/0x110 [ 25.409833] rds_conn_create_outgoing+0x3f/0x50 [ 25.414476] rds_sendmsg+0xda3/0x2390 [ 25.418246] ? avc_has_perm+0x43e/0x680 [ 25.422204] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.426670] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.431141] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.436135] ? find_held_lock+0x35/0x1d0 [ 25.440181] ? sock_has_perm+0x2a4/0x420 [ 25.444215] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.449548] ? lock_release+0xa22/0xa40 [ 25.453491] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.459347] ? __check_object_size+0x8b/0x530 [ 25.463812] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.468287] ? __might_sleep+0x95/0x190 [ 25.472237] ? selinux_socket_sendmsg+0x36/0x40 [ 25.476877] ? security_socket_sendmsg+0x89/0xb0 [ 25.481603] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.486071] sock_sendmsg+0xca/0x110 [ 25.489759] SYSC_sendto+0x361/0x5c0 [ 25.493448] ? SYSC_connect+0x4a0/0x4a0 [ 25.497401] ? __do_page_fault+0x5f7/0xc90 [ 25.501610] ? lock_downgrade+0x980/0x980 [ 25.505738] ? handle_mm_fault+0x43b/0x970 [ 25.509960] ? up_read+0x1a/0x40 [ 25.513300] ? __do_page_fault+0x3d6/0xc90 [ 25.517514] ? mm_fault_error+0x2c0/0x2c0 [ 25.521639] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.527150] SyS_sendto+0x40/0x50 [ 25.530579] ? SyS_getpeername+0x30/0x30 [ 25.534615] do_syscall_64+0x282/0x940 [ 25.538472] ? __do_page_fault+0xc90/0xc90 [ 25.542677] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.547404] ? syscall_return_slowpath+0x550/0x550 [ 25.552305] ? syscall_return_slowpath+0x2ac/0x550 [ 25.557208] ? prepare_exit_to_usermode+0x350/0x350 [ 25.562197] ? retint_user+0x18/0x18 [ 25.565888] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.570712] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.575870] RIP: 0033:0x43fd99 [ 25.579038] RSP: 002b:00007ffd9bf837c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.586719] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.593962] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 25.601203] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 25.608444] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.615683] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.622977] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.630422] in_atomic(): 1, irqs_disabled(): 0, pid: 4150, name: syzkaller002261 [ 25.637950] 1 lock held by syzkaller002261/4150: [ 25.642699] #0: (rcu_read_lock){....}, at: [<00000000807766fa>] __rds_conn_create+0xe46/0x1b50 [ 25.651639] CPU: 1 PID: 4150 Comm: syzkaller002261 Not tainted 4.16.0-rc1+ #309 [ 25.659065] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.668389] Call Trace: [ 25.670949] dump_stack+0x194/0x257 [ 25.674552] ? arch_local_irq_restore+0x53/0x53 [ 25.679192] ? print_lock+0x9f/0xa2 [ 25.682791] ? lockdep_print_held_locks+0xc4/0x130 [ 25.687696] ___might_sleep+0x2b2/0x470 [ 25.691644] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.697498] ? __debug_object_init+0x235/0x1040 [ 25.702137] ? debug_mutex_init+0x1c/0x60 [ 25.706263] __might_sleep+0x95/0x190 [ 25.710044] kmem_cache_alloc_trace+0x299/0x740 [ 25.714686] ? lock_acquire+0x1d5/0x580 [ 25.718633] ? lock_acquire+0x1d5/0x580 [ 25.722578] ? __rds_conn_create+0xe46/0x1b50 [ 25.727061] rds_loop_conn_alloc+0xc8/0x380 [ 25.731359] ? rds_loop_conn_free+0x290/0x290 [ 25.735833] ? __init_waitqueue_head+0x97/0x140 [ 25.740484] ? rcutorture_record_progress+0x10/0x10 [ 25.745481] ? __lockdep_init_map+0xe4/0x650 [ 25.749879] __rds_conn_create+0x112f/0x1b50 [ 25.754289] ? rds_conn_drop+0xb0/0xb0 [ 25.758161] ? __raw_spin_lock_init+0x1c/0x100 [ 25.762718] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.767709] ? __lockdep_init_map+0xe4/0x650 [ 25.772095] ? lockdep_init_map+0x9/0x10 [ 25.776129] ? __init_waitqueue_head+0x97/0x140 [ 25.780768] ? init_wait_entry+0x1b0/0x1b0 [ 25.784978] ? lockdep_init_map+0x9/0x10 [ 25.789019] ? rds_message_alloc+0x28c/0x330 [ 25.793407] ? rds_message_next_extension+0x210/0x210 [ 25.798569] ? trace_hardirqs_on+0xd/0x10 [ 25.802697] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.807089] ? __release_sock+0x360/0x360 [ 25.811211] ? lock_sock_nested+0x91/0x110 [ 25.815428] rds_conn_create_outgoing+0x3f/0x50 [ 25.820082] rds_sendmsg+0xda3/0x2390 [ 25.823855] ? avc_has_perm+0x43e/0x680 [ 25.827813] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.832281] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.836749] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.841742] ? find_held_lock+0x35/0x1d0 [ 25.845785] ? sock_has_perm+0x2a4/0x420 [ 25.849820] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.855160] ? lock_release+0xa22/0xa40 [ 25.859106] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.864960] ? __check_object_size+0x8b/0x530 [ 25.869425] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.873896] ? __might_sleep+0x95/0x190 [ 25.877845] ? selinux_socket_sendmsg+0x36/0x40 [ 25.882486] ? security_socket_sendmsg+0x89/0xb0 [ 25.887214] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.891692] sock_sendmsg+0xca/0x110 [ 25.895383] SYSC_sendto+0x361/0x5c0 [ 25.899084] ? SYSC_connect+0x4a0/0x4a0 [ 25.903049] ? __do_page_fault+0x5f7/0xc90 [ 25.907266] ? lock_downgrade+0x980/0x980 [ 25.911392] ? handle_mm_fault+0x43b/0x970 [ 25.915611] ? up_read+0x1a/0x40 [ 25.918951] ? __do_page_fault+0x3d6/0xc90 [ 25.923167] ? mm_fault_error+0x2c0/0x2c0 [ 25.927289] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.932800] SyS_sendto+0x40/0x50 [ 25.936227] ? SyS_getpeername+0x30/0x30 [ 25.940260] do_syscall_64+0x282/0x940 [ 25.944123] ? __do_page_fault+0xc90/0xc90 [ 25.948332] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.953060] ? syscall_return_slowpath+0x550/0x550 [ 25.957967] ? syscall_return_slowpath+0x2ac/0x550 [ 25.962867] ? prepare_exit_to_usermode+0x350/0x350 [ 25.967859] ? retint_user+0x18/0x18 [ 25.971552] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.976372] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.981530] RIP: 0033:0x43fd99 [ 25.984689] RSP: 002b:00007ffd9bf837c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.992370] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.999622] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 26.006872] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 26.014113] R10: 0000000