[....] Starting enhanced syslogd: rsyslogd[ 15.600308] audit: type=1400 audit(1518420989.139:5): avc: denied { syslog } for pid=3957 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: [ 19.083849] audit: type=1400 audit(1518420992.622:6): avc: denied { map } for pid=4096 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program [ 25.345403] audit: type=1400 audit(1518420998.884:7): avc: denied { map } for pid=4110 comm="syzkaller835990" path="/root/syzkaller835990570" 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 [ 25.372847] [ 25.374535] ============================= [ 25.378689] WARNING: suspicious RCU usage [ 25.382842] 4.16.0-rc1+ #309 Not tainted [ 25.386905] ----------------------------- [ 25.391059] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.400328] [ 25.400328] other info that might help us debug this: [ 25.400328] [ 25.408565] [ 25.408565] rcu_scheduler_active = 2, debug_locks = 1 [ 25.415239] 1 lock held by syzkaller835990/4110: [ 25.419995] #0: (rcu_read_lock){....}, at: [<00000000d06f9e91>] __rds_conn_create+0xe46/0x1b50 [ 25.428976] [ 25.428976] stack backtrace: [ 25.433487] CPU: 0 PID: 4110 Comm: syzkaller835990 Not tainted 4.16.0-rc1+ #309 [ 25.440916] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.450240] Call Trace: [ 25.452801] dump_stack+0x194/0x257 [ 25.456402] ? arch_local_irq_restore+0x53/0x53 [ 25.461056] lockdep_rcu_suspicious+0x123/0x170 [ 25.465699] ___might_sleep+0x385/0x470 [ 25.469646] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.475506] ? __debug_object_init+0x235/0x1040 [ 25.480151] ? debug_mutex_init+0x1c/0x60 [ 25.484275] __might_sleep+0x95/0x190 [ 25.488052] kmem_cache_alloc_trace+0x299/0x740 [ 25.492712] ? lock_acquire+0x1d5/0x580 [ 25.496659] ? lock_acquire+0x1d5/0x580 [ 25.500616] ? __rds_conn_create+0xe46/0x1b50 [ 25.505086] rds_loop_conn_alloc+0xc8/0x380 [ 25.509381] ? rds_loop_conn_free+0x290/0x290 [ 25.513849] ? __init_waitqueue_head+0x97/0x140 [ 25.518491] ? rcutorture_record_progress+0x10/0x10 [ 25.523481] ? __lockdep_init_map+0xe4/0x650 [ 25.527870] __rds_conn_create+0x112f/0x1b50 [ 25.532269] ? rds_conn_drop+0xb0/0xb0 [ 25.536137] ? __raw_spin_lock_init+0x1c/0x100 [ 25.540703] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.545694] ? __lockdep_init_map+0xe4/0x650 [ 25.550078] ? lockdep_init_map+0x9/0x10 [ 25.554110] ? __init_waitqueue_head+0x97/0x140 [ 25.558752] ? init_wait_entry+0x1b0/0x1b0 [ 25.562962] ? lockdep_init_map+0x9/0x10 [ 25.566998] ? rds_message_alloc+0x28c/0x330 [ 25.571392] ? rds_message_next_extension+0x210/0x210 [ 25.576549] ? trace_hardirqs_on+0xd/0x10 [ 25.580671] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.585055] ? __release_sock+0x360/0x360 [ 25.589172] ? lock_sock_nested+0x91/0x110 [ 25.593381] rds_conn_create_outgoing+0x3f/0x50 [ 25.598030] rds_sendmsg+0xda3/0x2390 [ 25.601813] ? avc_has_perm+0x43e/0x680 [ 25.605778] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.610252] ? lock_downgrade+0x980/0x980 [ 25.614375] ? rw_copy_check_uvector+0x1be/0x280 [ 25.619110] ? sock_has_perm+0x2a4/0x420 [ 25.623145] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.628480] ? dup_iter+0x252/0x260 [ 25.632087] ? kasan_check_write+0x14/0x20 [ 25.636297] ? copy_msghdr_from_user+0x3a6/0x590 [ 25.641028] ? check_noncircular+0x20/0x20 [ 25.645238] ? selinux_socket_sendmsg+0x36/0x40 [ 25.649880] ? security_socket_sendmsg+0x89/0xb0 [ 25.654606] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.659075] sock_sendmsg+0xca/0x110 [ 25.662764] ___sys_sendmsg+0x767/0x8b0 [ 25.666713] ? copy_msghdr_from_user+0x590/0x590 [ 25.671448] ? __pmd_alloc+0x4e0/0x4e0 [ 25.675311] ? check_noncircular+0x20/0x20 [ 25.679517] ? lock_release+0xa40/0xa40 [ 25.683574] ? lock_acquire+0x1d5/0x580 [ 25.687523] ? check_noncircular+0x20/0x20 [ 25.691732] ? find_held_lock+0x35/0x1d0 [ 25.695768] ? __fget_light+0x2b2/0x3c0 [ 25.699715] ? fget_raw+0x20/0x20 [ 25.703139] ? handle_mm_fault+0x270/0x970 [ 25.707353] ? find_held_lock+0x35/0x1d0 [ 25.711396] ? __do_page_fault+0x5f7/0xc90 [ 25.715607] ? lock_downgrade+0x980/0x980 [ 25.719738] __sys_sendmsg+0xe5/0x210 [ 25.723514] ? __sys_sendmsg+0xe5/0x210 [ 25.727461] ? SyS_shutdown+0x290/0x290 [ 25.731415] ? __do_page_fault+0x3d6/0xc90 [ 25.735633] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.741146] SyS_sendmsg+0x2d/0x50 [ 25.744656] ? __sys_sendmsg+0x210/0x210 [ 25.748689] do_syscall_64+0x282/0x940 [ 25.752549] ? __do_page_fault+0xc90/0xc90 [ 25.756754] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.761483] ? syscall_return_slowpath+0x550/0x550 [ 25.766389] ? syscall_return_slowpath+0x2ac/0x550 [ 25.771290] ? prepare_exit_to_usermode+0x350/0x350 [ 25.776280] ? retint_user+0x18/0x18 [ 25.779968] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.784788] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.789960] RIP: 0033:0x43fdf9 [ 25.793123] RSP: 002b:00007ffc5865f7c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 25.800801] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 25.808040] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 25.815279] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 25.822520] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401720 [ 25.829760] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 25.837125] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.844601] in_atomic(): 1, irqs_disabled(): 0, pid: 4110, name: syzkaller835990 [ 25.852198] 1 lock held by syzkaller835990/4110: [ 25.856998] #0: (rcu_read_lock){....}, at: [<00000000d06f9e91>] __rds_conn_create+0xe46/0x1b50 [ 25.866061] CPU: 0 PID: 4110 Comm: syzkaller835990 Not tainted 4.16.0-rc1+ #309 [ 25.873504] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.882850] Call Trace: [ 25.885425] dump_stack+0x194/0x257 [ 25.889030] ? arch_local_irq_restore+0x53/0x53 [ 25.893675] ? print_lock+0x9f/0xa2 [ 25.897274] ? lockdep_print_held_locks+0xc4/0x130 [ 25.902180] ___might_sleep+0x2b2/0x470 [ 25.906127] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.911982] ? __debug_object_init+0x235/0x1040 [ 25.916627] ? debug_mutex_init+0x1c/0x60 [ 25.920754] __might_sleep+0x95/0x190 [ 25.924532] kmem_cache_alloc_trace+0x299/0x740 [ 25.929172] ? lock_acquire+0x1d5/0x580 [ 25.933116] ? lock_acquire+0x1d5/0x580 [ 25.937062] ? __rds_conn_create+0xe46/0x1b50 [ 25.941536] rds_loop_conn_alloc+0xc8/0x380 [ 25.945839] ? rds_loop_conn_free+0x290/0x290 [ 25.950306] ? __init_waitqueue_head+0x97/0x140 [ 25.954950] ? rcutorture_record_progress+0x10/0x10 [ 25.959939] ? __lockdep_init_map+0xe4/0x650 [ 25.964323] __rds_conn_create+0x112f/0x1b50 [ 25.968720] ? rds_conn_drop+0xb0/0xb0 [ 25.972590] ? __raw_spin_lock_init+0x1c/0x100 [ 25.977146] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.982141] ? __lockdep_init_map+0xe4/0x650 [ 25.986525] ? lockdep_init_map+0x9/0x10 [ 25.990557] ? __init_waitqueue_head+0x97/0x140 [ 25.995197] ? init_wait_entry+0x1b0/0x1b0 [ 25.999407] ? lockdep_init_map+0x9/0x10 [ 26.003443] ? rds_message_alloc+0x28c/0x330 [ 26.007825] ? rds_message_next_extension+0x210/0x210 [ 26.012985] ? trace_hardirqs_on+0xd/0x10 [ 26.017112] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.021509] ? __release_sock+0x360/0x360 [ 26.025629] ? lock_sock_nested+0x91/0x110 [ 26.029839] rds_conn_create_outgoing+0x3f/0x50 [ 26.034485] rds_sendmsg+0xda3/0x2390 [ 26.038255] ? avc_has_perm+0x43e/0x680 [ 26.042214] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.046686] ? lock_downgrade+0x980/0x980 [ 26.050812] ? rw_copy_check_uvector+0x1be/0x280 [ 26.055548] ? sock_has_perm+0x2a4/0x420 [ 26.059583] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.064920] ? dup_iter+0x252/0x260 [ 26.068523] ? kasan_check_write+0x14/0x20 [ 26.072735] ? copy_msghdr_from_user+0x3a6/0x590 [ 26.077460] ? check_noncircular+0x20/0x20 [ 26.081669] ? selinux_socket_sendmsg+0x36/0x40 [ 26.086309] ? security_socket_sendmsg+0x89/0xb0 [ 26.091043] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.095520] sock_sendmsg+0xca/0x110 [ 26.099222] ___sys_sendmsg+0x767/0x8b0 [ 26.103175] ? copy_msghdr_from_user+0x590/0x590 [ 26.107908] ? __pmd_alloc+0x4e0/0x4e0 [ 26.111765] ? check_noncircular+0x20/0x20 [ 26.115970] ? lock_release+0xa40/0xa40 [ 26.119916] ? lock_acquire+0x1d5/0x580 [ 26.123862] ? check_noncircular+0x20/0x20 [ 26.128070] ? find_held_lock+0x35/0x1d0 [ 26.132107] ? __fget_light+0x2b2/0x3c0 [ 26.136055] ? fget_raw+0x20/0x20 [ 26.139483] ? handle_mm_fault+0x270/0x970 [ 26.143693] ? find_held_lock+0x35/0x1d0 [ 26.147734] ? __do_page_fault+0x5f7/0xc90 [ 26.151939] ? lock_downgrade+0x980/0x980 [ 26.156069] __sys_sendmsg+0xe5/0x210 [ 26.159842] ? __sys_sendmsg+0xe5/0x210 [ 26.163788] ? SyS_shutdown+0x290/0x290 [ 26.167744] ? __do_page_fault+0x3d6/0xc90 [ 26.171960] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.177481] SyS_sendmsg+0x2d/0x50 [ 26.180992] ? __sys_sendmsg+0x210/0x210 [ 26.185024] do_syscall_64+0x282/0x940 [ 26.188888] ? __do_page_fault+0xc90/0xc90 [ 26.193094] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.197822] ? syscall_return_slowpath+0x550/0x550 [ 26.202723] ? syscall_return_slowpath+0x2ac/0x550 [ 26.207626] ? prepare_exit_to_usermode+0x350/0x350 [ 26.212616] ? retint_user+0x18/0x18 [ 26.216306] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.221133] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.226292] RIP: 0033:0x43fdf9 [ 26.229452] RSP: 002b:00007ffc5865f7c8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.237131] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 26.244373] RDX: 0000000000000000 RSI: 0000000020159