[....] Starting enhanced syslogd: rsyslogd[ 15.934102] audit: type=1400 audit(1518353107.454:5): avc: denied { syslog } for pid=3977 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: [ 19.113182] audit: type=1400 audit(1518353110.633:6): avc: denied { map } for pid=4116 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 '10.128.0.51' (ECDSA) to the list of known hosts. executing program [ 25.403675] audit: type=1400 audit(1518353116.924:7): avc: denied { map } for pid=4130 comm="syzkaller331234" path="/root/syzkaller331234332" 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 [ 25.430497] [ 25.432194] ============================= [ 25.436341] WARNING: suspicious RCU usage [ 25.440491] 4.15.0+ #308 Not tainted [ 25.444200] ----------------------------- [ 25.448357] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.457620] [ 25.457620] other info that might help us debug this: [ 25.457620] [ 25.465757] [ 25.465757] rcu_scheduler_active = 2, debug_locks = 1 [ 25.472424] 1 lock held by syzkaller331234/4130: [ 25.477170] #0: (rcu_read_lock){....}, at: [<00000000293475a2>] __rds_conn_create+0xe46/0x1b50 [ 25.486130] [ 25.486130] stack backtrace: [ 25.490635] CPU: 1 PID: 4130 Comm: syzkaller331234 Not tainted 4.15.0+ #308 [ 25.497706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.507033] Call Trace: [ 25.509601] dump_stack+0x194/0x257 [ 25.513206] ? arch_local_irq_restore+0x53/0x53 [ 25.517860] lockdep_rcu_suspicious+0x123/0x170 [ 25.522505] ___might_sleep+0x385/0x470 [ 25.526452] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.532312] ? __debug_object_init+0x235/0x1040 [ 25.536956] ? debug_mutex_init+0x1c/0x60 [ 25.541085] __might_sleep+0x95/0x190 [ 25.544862] kmem_cache_alloc_trace+0x299/0x740 [ 25.549507] ? lock_acquire+0x1d5/0x580 [ 25.553452] ? lock_acquire+0x1d5/0x580 [ 25.557401] ? __rds_conn_create+0xe46/0x1b50 [ 25.561873] rds_loop_conn_alloc+0xc8/0x380 [ 25.566169] ? rds_loop_conn_free+0x290/0x290 [ 25.570643] ? __init_waitqueue_head+0x97/0x140 [ 25.575291] ? rcutorture_record_progress+0x10/0x10 [ 25.580289] ? __lockdep_init_map+0xe4/0x650 [ 25.584679] __rds_conn_create+0x112f/0x1b50 [ 25.589089] ? rds_conn_drop+0xb0/0xb0 [ 25.592957] ? __raw_spin_lock_init+0x1c/0x100 [ 25.597514] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.602509] ? __lockdep_init_map+0xe4/0x650 [ 25.606895] ? lockdep_init_map+0x9/0x10 [ 25.610928] ? __init_waitqueue_head+0x97/0x140 [ 25.615571] ? init_wait_entry+0x1b0/0x1b0 [ 25.619780] ? lockdep_init_map+0x9/0x10 [ 25.623819] ? rds_message_alloc+0x28c/0x330 [ 25.628199] ? rds_message_next_extension+0x210/0x210 [ 25.633362] ? trace_hardirqs_on+0xd/0x10 [ 25.637485] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.641870] ? __release_sock+0x360/0x360 [ 25.645990] ? lock_sock_nested+0x91/0x110 [ 25.650204] rds_conn_create_outgoing+0x3f/0x50 [ 25.654852] rds_sendmsg+0xda3/0x2390 [ 25.658623] ? avc_has_perm+0x43e/0x680 [ 25.662587] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.667058] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.671533] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.676527] ? find_held_lock+0x35/0x1d0 [ 25.680569] ? sock_has_perm+0x2a4/0x420 [ 25.684603] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.689939] ? lock_release+0xa22/0xa40 [ 25.693884] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.699743] ? __check_object_size+0x8b/0x530 [ 25.704213] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.708689] ? __might_sleep+0x95/0x190 [ 25.712644] ? selinux_socket_sendmsg+0x36/0x40 [ 25.717287] ? security_socket_sendmsg+0x89/0xb0 [ 25.722026] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.726500] sock_sendmsg+0xca/0x110 [ 25.730188] SYSC_sendto+0x361/0x5c0 [ 25.733877] ? SYSC_connect+0x4a0/0x4a0 [ 25.737830] ? __do_page_fault+0x5f7/0xc90 [ 25.742041] ? lock_downgrade+0x980/0x980 [ 25.746170] ? handle_mm_fault+0x43b/0x970 [ 25.750388] ? up_read+0x1a/0x40 [ 25.753727] ? __do_page_fault+0x3d6/0xc90 [ 25.757940] ? mm_fault_error+0x2c0/0x2c0 [ 25.762063] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.767605] SyS_sendto+0x40/0x50 [ 25.771038] ? SyS_getpeername+0x30/0x30 [ 25.775077] do_syscall_64+0x282/0x940 [ 25.778938] ? __do_page_fault+0xc90/0xc90 [ 25.783149] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.787885] ? syscall_return_slowpath+0x550/0x550 [ 25.792799] ? syscall_return_slowpath+0x2ac/0x550 [ 25.797706] ? prepare_exit_to_usermode+0x350/0x350 [ 25.802696] ? retint_user+0x18/0x18 [ 25.806388] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.811208] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.816369] RIP: 0033:0x43fd99 [ 25.819531] RSP: 002b:00007ffec9368ca8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.827209] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.834452] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 25.841692] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 25.848933] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.856176] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.863478] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.870921] in_atomic(): 1, irqs_disabled(): 0, pid: 4130, name: syzkaller331234 [ 25.878458] 1 lock held by syzkaller331234/4130: [ 25.883207] #0: (rcu_read_lock){....}, at: [<00000000293475a2>] __rds_conn_create+0xe46/0x1b50 [ 25.892153] CPU: 1 PID: 4130 Comm: syzkaller331234 Not tainted 4.15.0+ #308 [ 25.899230] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.908555] Call Trace: [ 25.911118] dump_stack+0x194/0x257 [ 25.915099] ? arch_local_irq_restore+0x53/0x53 [ 25.919754] ? print_lock+0x9f/0xa2 [ 25.923353] ? lockdep_print_held_locks+0xc4/0x130 [ 25.928260] ___might_sleep+0x2b2/0x470 [ 25.932206] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.938061] ? __debug_object_init+0x235/0x1040 [ 25.942706] ? debug_mutex_init+0x1c/0x60 [ 25.946833] __might_sleep+0x95/0x190 [ 25.950616] kmem_cache_alloc_trace+0x299/0x740 [ 25.955269] ? lock_acquire+0x1d5/0x580 [ 25.959216] ? lock_acquire+0x1d5/0x580 [ 25.963167] ? __rds_conn_create+0xe46/0x1b50 [ 25.967640] rds_loop_conn_alloc+0xc8/0x380 [ 25.971937] ? rds_loop_conn_free+0x290/0x290 [ 25.976406] ? __init_waitqueue_head+0x97/0x140 [ 25.981058] ? rcutorture_record_progress+0x10/0x10 [ 25.986051] ? __lockdep_init_map+0xe4/0x650 [ 25.990439] __rds_conn_create+0x112f/0x1b50 [ 25.994840] ? rds_conn_drop+0xb0/0xb0 [ 25.998711] ? __raw_spin_lock_init+0x1c/0x100 [ 26.003266] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.008263] ? __lockdep_init_map+0xe4/0x650 [ 26.012647] ? lockdep_init_map+0x9/0x10 [ 26.016689] ? __init_waitqueue_head+0x97/0x140 [ 26.021330] ? init_wait_entry+0x1b0/0x1b0 [ 26.025543] ? lockdep_init_map+0x9/0x10 [ 26.029583] ? rds_message_alloc+0x28c/0x330 [ 26.033965] ? rds_message_next_extension+0x210/0x210 [ 26.039127] ? trace_hardirqs_on+0xd/0x10 [ 26.043253] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.047641] ? __release_sock+0x360/0x360 [ 26.051762] ? lock_sock_nested+0x91/0x110 [ 26.055979] rds_conn_create_outgoing+0x3f/0x50 [ 26.060624] rds_sendmsg+0xda3/0x2390 [ 26.064395] ? avc_has_perm+0x43e/0x680 [ 26.068357] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.072824] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.077296] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.082288] ? find_held_lock+0x35/0x1d0 [ 26.086331] ? sock_has_perm+0x2a4/0x420 [ 26.090368] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.095704] ? lock_release+0xa22/0xa40 [ 26.099650] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.105513] ? __check_object_size+0x8b/0x530 [ 26.109984] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.114460] ? __might_sleep+0x95/0x190 [ 26.118412] ? selinux_socket_sendmsg+0x36/0x40 [ 26.123066] ? security_socket_sendmsg+0x89/0xb0 [ 26.127794] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.132282] sock_sendmsg+0xca/0x110 [ 26.135971] SYSC_sendto+0x361/0x5c0 [ 26.139659] ? SYSC_connect+0x4a0/0x4a0 [ 26.143624] ? __do_page_fault+0x5f7/0xc90 [ 26.147840] ? lock_downgrade+0x980/0x980 [ 26.151968] ? handle_mm_fault+0x43b/0x970 [ 26.156187] ? up_read+0x1a/0x40 [ 26.159528] ? __do_page_fault+0x3d6/0xc90 [ 26.163829] ? mm_fault_error+0x2c0/0x2c0 [ 26.167950] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.173468] SyS_sendto+0x40/0x50 [ 26.176903] ? SyS_getpeername+0x30/0x30 [ 26.180952] do_syscall_64+0x282/0x940 [ 26.184821] ? __do_page_fault+0xc90/0xc90 [ 26.189040] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.193773] ? syscall_return_slowpath+0x550/0x550 [ 26.198683] ? syscall_return_slowpath+0x2ac/0x550 [ 26.203585] ? prepare_exit_to_usermode+0x350/0x350 [ 26.208575] ? retint_user+0x18/0x18 [ 26.212266] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.217089] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.222249] RIP: 0033:0x43fd99 [ 26.225412] RSP: 002b:00007ffec9368ca8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.233093] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.240334] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 26.247575] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 26.254823] R10: 0000000000