[....] Starting enhanced syslogd: rsyslogd[ 15.707468] audit: type=1400 audit(1518428838.756:5): avc: denied { syslog } for pid=4009 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: [ 19.468150] audit: type=1400 audit(1518428842.516:6): avc: denied { map } for pid=4148 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 '10.128.15.229' (ECDSA) to the list of known hosts. executing program [ 25.779967] audit: type=1400 audit(1518428848.828:7): avc: denied { map } for pid=4162 comm="syzkaller181969" path="/root/syzkaller181969273" 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 [ 25.806945] [ 25.808646] ============================= [ 25.812923] WARNING: suspicious RCU usage [ 25.817084] 4.16.0-rc1+ #309 Not tainted [ 25.821154] ----------------------------- [ 25.825316] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.834594] [ 25.834594] other info that might help us debug this: [ 25.834594] [ 25.842746] [ 25.842746] rcu_scheduler_active = 2, debug_locks = 1 [ 25.849420] 1 lock held by syzkaller181969/4162: [ 25.854185] #0: (rcu_read_lock){....}, at: [<00000000b4f31e0f>] __rds_conn_create+0xe46/0x1b50 [ 25.863135] [ 25.863135] stack backtrace: [ 25.867649] CPU: 0 PID: 4162 Comm: syzkaller181969 Not tainted 4.16.0-rc1+ #309 [ 25.875076] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.884407] Call Trace: [ 25.886968] dump_stack+0x194/0x257 [ 25.890571] ? arch_local_irq_restore+0x53/0x53 [ 25.895223] lockdep_rcu_suspicious+0x123/0x170 [ 25.899867] ___might_sleep+0x385/0x470 [ 25.903816] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.909673] ? __debug_object_init+0x235/0x1040 [ 25.914318] ? debug_mutex_init+0x1c/0x60 [ 25.918446] __might_sleep+0x95/0x190 [ 25.922224] kmem_cache_alloc_trace+0x299/0x740 [ 25.926867] ? lock_acquire+0x1d5/0x580 [ 25.930812] ? lock_acquire+0x1d5/0x580 [ 25.934759] ? __rds_conn_create+0xe46/0x1b50 [ 25.939228] rds_loop_conn_alloc+0xc8/0x380 [ 25.943528] ? rds_loop_conn_free+0x290/0x290 [ 25.947997] ? __init_waitqueue_head+0x97/0x140 [ 25.952641] ? rcutorture_record_progress+0x10/0x10 [ 25.957631] ? __lockdep_init_map+0xe4/0x650 [ 25.962017] __rds_conn_create+0x112f/0x1b50 [ 25.966416] ? rds_conn_drop+0xb0/0xb0 [ 25.970289] ? __raw_spin_lock_init+0x1c/0x100 [ 25.974846] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.979842] ? __lockdep_init_map+0xe4/0x650 [ 25.984227] ? lockdep_init_map+0x9/0x10 [ 25.988259] ? __init_waitqueue_head+0x97/0x140 [ 25.992910] ? init_wait_entry+0x1b0/0x1b0 [ 25.997122] ? lockdep_init_map+0x9/0x10 [ 26.001158] ? rds_message_alloc+0x28c/0x330 [ 26.005540] ? rds_message_next_extension+0x210/0x210 [ 26.010699] ? trace_hardirqs_on+0xd/0x10 [ 26.014822] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.019619] ? __release_sock+0x360/0x360 [ 26.023739] ? lock_sock_nested+0x91/0x110 [ 26.027953] rds_conn_create_outgoing+0x3f/0x50 [ 26.032596] rds_sendmsg+0xda3/0x2390 [ 26.036367] ? avc_has_perm+0x43e/0x680 [ 26.040338] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.044806] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.049275] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.054267] ? find_held_lock+0x35/0x1d0 [ 26.058917] ? sock_has_perm+0x2a4/0x420 [ 26.062953] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.068286] ? lock_release+0xa22/0xa40 [ 26.072232] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.078092] ? __check_object_size+0x8b/0x530 [ 26.082558] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.087044] ? __might_sleep+0x95/0x190 [ 26.091004] ? selinux_socket_sendmsg+0x36/0x40 [ 26.095667] ? security_socket_sendmsg+0x89/0xb0 [ 26.100402] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.104875] sock_sendmsg+0xca/0x110 [ 26.108565] SYSC_sendto+0x361/0x5c0 [ 26.112257] ? SYSC_connect+0x4a0/0x4a0 [ 26.116208] ? __do_page_fault+0x5f7/0xc90 [ 26.120418] ? lock_downgrade+0x980/0x980 [ 26.124552] ? handle_mm_fault+0x43b/0x970 [ 26.128771] ? up_read+0x1a/0x40 [ 26.132109] ? __do_page_fault+0x3d6/0xc90 [ 26.136321] ? mm_fault_error+0x2c0/0x2c0 [ 26.140447] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.145961] SyS_sendto+0x40/0x50 [ 26.149390] ? SyS_getpeername+0x30/0x30 [ 26.153430] do_syscall_64+0x282/0x940 [ 26.157291] ? __do_page_fault+0xc90/0xc90 [ 26.161499] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.166228] ? syscall_return_slowpath+0x550/0x550 [ 26.171131] ? syscall_return_slowpath+0x2ac/0x550 [ 26.176033] ? prepare_exit_to_usermode+0x350/0x350 [ 26.181023] ? retint_user+0x18/0x18 [ 26.184714] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.189537] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.194696] RIP: 0033:0x43fd99 [ 26.197857] RSP: 002b:00007ffd22d85108 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.205537] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.212778] RDX: 0000000000000000 RSI: 0000000020ea8000 RDI: 0000000000000003 [ 26.220020] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 26.227261] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.234500] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 26.241799] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.249261] in_atomic(): 1, irqs_disabled(): 0, pid: 4162, name: syzkaller181969 [ 26.256805] 1 lock held by syzkaller181969/4162: [ 26.261560] #0: (rcu_read_lock){....}, at: [<00000000b4f31e0f>] __rds_conn_create+0xe46/0x1b50 [ 26.270514] CPU: 0 PID: 4162 Comm: syzkaller181969 Not tainted 4.16.0-rc1+ #309 [ 26.277939] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.287263] Call Trace: [ 26.289823] dump_stack+0x194/0x257 [ 26.293429] ? arch_local_irq_restore+0x53/0x53 [ 26.298080] ? print_lock+0x9f/0xa2 [ 26.301680] ? lockdep_print_held_locks+0xc4/0x130 [ 26.306586] ___might_sleep+0x2b2/0x470 [ 26.310532] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.316387] ? __debug_object_init+0x235/0x1040 [ 26.321033] ? debug_mutex_init+0x1c/0x60 [ 26.325158] __might_sleep+0x95/0x190 [ 26.328936] kmem_cache_alloc_trace+0x299/0x740 [ 26.333580] ? lock_acquire+0x1d5/0x580 [ 26.337526] ? lock_acquire+0x1d5/0x580 [ 26.341473] ? __rds_conn_create+0xe46/0x1b50 [ 26.345943] rds_loop_conn_alloc+0xc8/0x380 [ 26.350241] ? rds_loop_conn_free+0x290/0x290 [ 26.354712] ? __init_waitqueue_head+0x97/0x140 [ 26.359359] ? rcutorture_record_progress+0x10/0x10 [ 26.364350] ? __lockdep_init_map+0xe4/0x650 [ 26.368735] __rds_conn_create+0x112f/0x1b50 [ 26.373135] ? rds_conn_drop+0xb0/0xb0 [ 26.377003] ? __raw_spin_lock_init+0x1c/0x100 [ 26.381558] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.386552] ? __lockdep_init_map+0xe4/0x650 [ 26.390936] ? lockdep_init_map+0x9/0x10 [ 26.394970] ? __init_waitqueue_head+0x97/0x140 [ 26.399613] ? init_wait_entry+0x1b0/0x1b0 [ 26.403825] ? lockdep_init_map+0x9/0x10 [ 26.407861] ? rds_message_alloc+0x28c/0x330 [ 26.412241] ? rds_message_next_extension+0x210/0x210 [ 26.417405] ? trace_hardirqs_on+0xd/0x10 [ 26.421528] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.425914] ? __release_sock+0x360/0x360 [ 26.430045] ? lock_sock_nested+0x91/0x110 [ 26.434263] rds_conn_create_outgoing+0x3f/0x50 [ 26.438906] rds_sendmsg+0xda3/0x2390 [ 26.442677] ? avc_has_perm+0x43e/0x680 [ 26.446637] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.451103] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.455571] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.460575] ? find_held_lock+0x35/0x1d0 [ 26.464618] ? sock_has_perm+0x2a4/0x420 [ 26.468653] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.473987] ? lock_release+0xa22/0xa40 [ 26.477936] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.483792] ? __check_object_size+0x8b/0x530 [ 26.488260] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.492735] ? __might_sleep+0x95/0x190 [ 26.496688] ? selinux_socket_sendmsg+0x36/0x40 [ 26.501330] ? security_socket_sendmsg+0x89/0xb0 [ 26.506069] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.510545] sock_sendmsg+0xca/0x110 [ 26.514234] SYSC_sendto+0x361/0x5c0 [ 26.517923] ? SYSC_connect+0x4a0/0x4a0 [ 26.521876] ? __do_page_fault+0x5f7/0xc90 [ 26.526090] ? lock_downgrade+0x980/0x980 [ 26.530216] ? handle_mm_fault+0x43b/0x970 [ 26.534435] ? up_read+0x1a/0x40 [ 26.537774] ? __do_page_fault+0x3d6/0xc90 [ 26.541986] ? mm_fault_error+0x2c0/0x2c0 [ 26.546110] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.551624] SyS_sendto+0x40/0x50 [ 26.555049] ? SyS_getpeername+0x30/0x30 [ 26.559081] do_syscall_64+0x282/0x940 [ 26.562938] ? __do_page_fault+0xc90/0xc90 [ 26.567143] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.571872] ? syscall_return_slowpath+0x550/0x550 [ 26.576775] ? syscall_return_slowpath+0x2ac/0x550 [ 26.581684] ? prepare_exit_to_usermode+0x350/0x350 [ 26.586681] ? retint_user+0x18/0x18 [ 26.590370] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.595192] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.600353] RIP: 0033:0x43fd99 [ 26.603514] RSP: 002b:00007ffd22d85108 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.611192] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.618431] RDX: 0000000000000000 RSI: 0000000020ea8000 RDI: 0000000000000003 [ 26.625671] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 26.63291