[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 17.846462] audit: type=1400 audit(1518372642.687:6): avc: denied { map } for pid=4158 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.166821] audit: type=1400 audit(1518372649.007:7): avc: denied { map } for pid=4172 comm="syzkaller634990" path="/root/syzkaller634990360" 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 [ 24.192908] [ 24.194649] ============================= [ 24.198799] WARNING: suspicious RCU usage [ 24.202945] 4.15.0+ #222 Not tainted [ 24.206655] ----------------------------- [ 24.210812] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.220082] [ 24.220082] other info that might help us debug this: [ 24.220082] [ 24.228224] [ 24.228224] rcu_scheduler_active = 2, debug_locks = 1 [ 24.234887] 1 lock held by syzkaller634990/4172: [ 24.239644] #0: (rcu_read_lock){....}, at: [<0000000083832d35>] __rds_conn_create+0xe46/0x1b50 [ 24.248582] [ 24.248582] stack backtrace: [ 24.253081] CPU: 0 PID: 4172 Comm: syzkaller634990 Not tainted 4.15.0+ #222 [ 24.260162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.269487] Call Trace: [ 24.272058] dump_stack+0x194/0x257 [ 24.275669] ? arch_local_irq_restore+0x53/0x53 [ 24.280324] lockdep_rcu_suspicious+0x123/0x170 [ 24.284970] ___might_sleep+0x385/0x470 [ 24.288925] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.294780] ? __debug_object_init+0x235/0x1040 [ 24.299427] ? debug_mutex_init+0x1c/0x60 [ 24.303553] __might_sleep+0x95/0x190 [ 24.307334] kmem_cache_alloc_trace+0x299/0x740 [ 24.311978] ? lock_acquire+0x1d5/0x580 [ 24.315927] ? lock_acquire+0x1d5/0x580 [ 24.319876] ? __rds_conn_create+0xe46/0x1b50 [ 24.324347] rds_loop_conn_alloc+0xc8/0x380 [ 24.328643] ? rds_loop_conn_free+0x290/0x290 [ 24.333122] ? __init_waitqueue_head+0x97/0x140 [ 24.337770] ? rcutorture_record_progress+0x10/0x10 [ 24.342759] ? __lockdep_init_map+0xe4/0x650 [ 24.347146] __rds_conn_create+0x112f/0x1b50 [ 24.351546] ? rds_conn_drop+0xb0/0xb0 [ 24.355415] ? __raw_spin_lock_init+0x1c/0x100 [ 24.359971] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.364970] ? __lockdep_init_map+0xe4/0x650 [ 24.369357] ? lockdep_init_map+0x9/0x10 [ 24.373393] ? __init_waitqueue_head+0x97/0x140 [ 24.378042] ? init_wait_entry+0x1b0/0x1b0 [ 24.382258] ? lockdep_init_map+0x9/0x10 [ 24.386297] ? rds_message_alloc+0x28c/0x330 [ 24.390678] ? rds_message_next_extension+0x210/0x210 [ 24.395841] ? trace_hardirqs_on+0xd/0x10 [ 24.399965] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.404360] ? __release_sock+0x360/0x360 [ 24.408478] ? lock_sock_nested+0x91/0x110 [ 24.412688] rds_conn_create_outgoing+0x3f/0x50 [ 24.417334] rds_sendmsg+0xda3/0x2390 [ 24.421108] ? avc_has_perm+0x43e/0x680 [ 24.425069] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.429538] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.434013] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.439024] ? find_held_lock+0x35/0x1d0 [ 24.443072] ? sock_has_perm+0x2a4/0x420 [ 24.447112] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.452449] ? lock_release+0xa02/0xa40 [ 24.456394] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.462255] ? __check_object_size+0x8b/0x530 [ 24.466734] ? __might_sleep+0x95/0x190 [ 24.470686] ? selinux_socket_sendmsg+0x36/0x40 [ 24.475328] ? security_socket_sendmsg+0x89/0xb0 [ 24.480064] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.484543] sock_sendmsg+0xca/0x110 [ 24.488234] SYSC_sendto+0x361/0x5c0 [ 24.491928] ? SYSC_connect+0x4a0/0x4a0 [ 24.495891] ? schedule+0xf5/0x430 [ 24.499404] ? SYSC_bind+0x290/0x410 [ 24.503112] ? exit_to_usermode_loop+0x8c/0x2f0 [ 24.507760] ? trace_hardirqs_off+0xd/0x10 [ 24.511965] ? exit_to_usermode_loop+0x198/0x2f0 [ 24.516697] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.522213] SyS_sendto+0x40/0x50 [ 24.525640] ? SyS_getpeername+0x30/0x30 [ 24.529675] do_syscall_64+0x282/0x940 [ 24.533534] ? __do_page_fault+0xc90/0xc90 [ 24.537741] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.542472] ? syscall_return_slowpath+0x550/0x550 [ 24.547377] ? syscall_return_slowpath+0x2ac/0x550 [ 24.552280] ? prepare_exit_to_usermode+0x350/0x350 [ 24.557272] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 24.562613] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.567436] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.572597] RIP: 0033:0x43fd99 [ 24.575758] RSP: 002b:00007ffe10baa9b8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.583437] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.590676] RDX: 0000000000000000 RSI: 0000000020c15000 RDI: 0000000000000003 [ 24.597919] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 24.605170] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 24.612414] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 24.619710] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.627154] in_atomic(): 1, irqs_disabled(): 0, pid: 4172, name: syzkaller634990 [ 24.634687] 1 lock held by syzkaller634990/4172: [ 24.639435] #0: (rcu_read_lock){....}, at: [<0000000083832d35>] __rds_conn_create+0xe46/0x1b50 [ 24.648374] CPU: 0 PID: 4172 Comm: syzkaller634990 Not tainted 4.15.0+ #222 [ 24.655451] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.664777] Call Trace: [ 24.667338] dump_stack+0x194/0x257 [ 24.670941] ? arch_local_irq_restore+0x53/0x53 [ 24.675587] ? print_lock+0x9f/0xa2 [ 24.679187] ? lockdep_print_held_locks+0xc4/0x130 [ 24.684095] ___might_sleep+0x2b2/0x470 [ 24.688050] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.693910] ? __debug_object_init+0x235/0x1040 [ 24.698555] ? debug_mutex_init+0x1c/0x60 [ 24.702681] __might_sleep+0x95/0x190 [ 24.706460] kmem_cache_alloc_trace+0x299/0x740 [ 24.711107] ? lock_acquire+0x1d5/0x580 [ 24.715058] ? lock_acquire+0x1d5/0x580 [ 24.719012] ? __rds_conn_create+0xe46/0x1b50 [ 24.723493] rds_loop_conn_alloc+0xc8/0x380 [ 24.727790] ? rds_loop_conn_free+0x290/0x290 [ 24.732259] ? __init_waitqueue_head+0x97/0x140 [ 24.736903] ? rcutorture_record_progress+0x10/0x10 [ 24.741892] ? __lockdep_init_map+0xe4/0x650 [ 24.746278] __rds_conn_create+0x112f/0x1b50 [ 24.750675] ? rds_conn_drop+0xb0/0xb0 [ 24.754544] ? __raw_spin_lock_init+0x1c/0x100 [ 24.759099] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.764096] ? __lockdep_init_map+0xe4/0x650 [ 24.768480] ? lockdep_init_map+0x9/0x10 [ 24.772514] ? __init_waitqueue_head+0x97/0x140 [ 24.777158] ? init_wait_entry+0x1b0/0x1b0 [ 24.781372] ? lockdep_init_map+0x9/0x10 [ 24.785408] ? rds_message_alloc+0x28c/0x330 [ 24.789788] ? rds_message_next_extension+0x210/0x210 [ 24.794959] ? trace_hardirqs_on+0xd/0x10 [ 24.799084] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.803472] ? __release_sock+0x360/0x360 [ 24.807591] ? lock_sock_nested+0x91/0x110 [ 24.811800] rds_conn_create_outgoing+0x3f/0x50 [ 24.816446] rds_sendmsg+0xda3/0x2390 [ 24.820218] ? avc_has_perm+0x43e/0x680 [ 24.824177] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.828647] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.833121] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.838122] ? find_held_lock+0x35/0x1d0 [ 24.842167] ? sock_has_perm+0x2a4/0x420 [ 24.846202] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.851537] ? lock_release+0xa02/0xa40 [ 24.855485] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.861344] ? __check_object_size+0x8b/0x530 [ 24.865818] ? __might_sleep+0x95/0x190 [ 24.869771] ? selinux_socket_sendmsg+0x36/0x40 [ 24.874412] ? security_socket_sendmsg+0x89/0xb0 [ 24.879144] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.883616] sock_sendmsg+0xca/0x110 [ 24.887305] SYSC_sendto+0x361/0x5c0 [ 24.890994] ? SYSC_connect+0x4a0/0x4a0 [ 24.894961] ? schedule+0xf5/0x430 [ 24.898472] ? SYSC_bind+0x290/0x410 [ 24.902176] ? exit_to_usermode_loop+0x8c/0x2f0 [ 24.906827] ? trace_hardirqs_off+0xd/0x10 [ 24.911043] ? exit_to_usermode_loop+0x198/0x2f0 [ 24.915777] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.921294] SyS_sendto+0x40/0x50 [ 24.924722] ? SyS_getpeername+0x30/0x30 [ 24.928756] do_syscall_64+0x282/0x940 [ 24.932616] ? __do_page_fault+0xc90/0xc90 [ 24.936825] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.941561] ? syscall_return_slowpath+0x550/0x550 [ 24.946465] ? syscall_return_slowpath+0x2ac/0x550 [ 24.951369] ? prepare_exit_to_usermode+0x350/0x350 [ 24.956376] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 24.961717] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.966539] entry_SYSCALL_64_after_hwfram