[....] Starting enhanced syslogd: rsyslogd[ 15.203651] audit: type=1400 audit(1518350825.185:5): avc: denied { syslog } for pid=3932 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: [ 19.036973] audit: type=1400 audit(1518350829.018:6): avc: denied { map } for pid=4073 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 '10.128.0.2' (ECDSA) to the list of known hosts. executing program [ 25.361617] audit: type=1400 audit(1518350835.343:7): avc: denied { map } for pid=4087 comm="syzkaller271598" path="/root/syzkaller271598436" 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 [ 25.388288] [ 25.389978] ============================= [ 25.394126] WARNING: suspicious RCU usage [ 25.398274] 4.15.0+ #308 Not tainted [ 25.401984] ----------------------------- [ 25.406132] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.415401] [ 25.415401] other info that might help us debug this: [ 25.415401] [ 25.423554] [ 25.423554] rcu_scheduler_active = 2, debug_locks = 1 [ 25.430225] 1 lock held by syzkaller271598/4087: [ 25.435104] #0: (rcu_read_lock){....}, at: [<00000000e09faef0>] __rds_conn_create+0xe46/0x1b50 [ 25.444056] [ 25.444056] stack backtrace: [ 25.448554] CPU: 0 PID: 4087 Comm: syzkaller271598 Not tainted 4.15.0+ #308 [ 25.455621] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.464946] Call Trace: [ 25.467508] dump_stack+0x194/0x257 [ 25.471109] ? arch_local_irq_restore+0x53/0x53 [ 25.475760] lockdep_rcu_suspicious+0x123/0x170 [ 25.480401] ___might_sleep+0x385/0x470 [ 25.484346] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.490199] ? __debug_object_init+0x235/0x1040 [ 25.494840] ? debug_mutex_init+0x1c/0x60 [ 25.498965] __might_sleep+0x95/0x190 [ 25.502740] kmem_cache_alloc_trace+0x299/0x740 [ 25.507383] ? lock_acquire+0x1d5/0x580 [ 25.511329] ? lock_acquire+0x1d5/0x580 [ 25.515276] ? __rds_conn_create+0xe46/0x1b50 [ 25.519748] rds_loop_conn_alloc+0xc8/0x380 [ 25.524042] ? rds_loop_conn_free+0x290/0x290 [ 25.528512] ? __init_waitqueue_head+0x97/0x140 [ 25.533155] ? rcutorture_record_progress+0x10/0x10 [ 25.538143] ? __lockdep_init_map+0xe4/0x650 [ 25.542527] __rds_conn_create+0x112f/0x1b50 [ 25.546925] ? rds_conn_drop+0xb0/0xb0 [ 25.550782] ? find_held_lock+0x35/0x1d0 [ 25.554816] ? retint_kernel+0x10/0x10 [ 25.558675] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.563665] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.568399] ? retint_kernel+0x10/0x10 [ 25.572274] ? copy_user_enhanced_fast_string+0xe/0x20 [ 25.577524] ? copyin+0x91/0xb0 [ 25.580780] ? copy_page_from_iter+0x50e/0x7c0 [ 25.585341] ? _copy_from_iter+0xf30/0xf30 [ 25.589550] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.593937] ? rds_message_copy_from_user+0x29e/0x370 [ 25.599103] rds_conn_create_outgoing+0x3f/0x50 [ 25.603751] rds_sendmsg+0xda3/0x2390 [ 25.607520] ? avc_has_perm+0x43e/0x680 [ 25.611479] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.615954] ? find_held_lock+0x35/0x1d0 [ 25.619995] ? sock_has_perm+0x2a4/0x420 [ 25.624040] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.629377] ? lock_release+0xa22/0xa40 [ 25.633323] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.639180] ? __check_object_size+0x8b/0x530 [ 25.643644] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.648117] ? __might_sleep+0x95/0x190 [ 25.652066] ? selinux_socket_sendmsg+0x36/0x40 [ 25.656705] ? security_socket_sendmsg+0x89/0xb0 [ 25.661431] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.665900] sock_sendmsg+0xca/0x110 [ 25.669587] SYSC_sendto+0x361/0x5c0 [ 25.673277] ? SYSC_connect+0x4a0/0x4a0 [ 25.677229] ? __do_page_fault+0x5f7/0xc90 [ 25.681433] ? lock_downgrade+0x980/0x980 [ 25.685559] ? handle_mm_fault+0x43b/0x970 [ 25.689777] ? up_read+0x1a/0x40 [ 25.693118] ? __do_page_fault+0x3d6/0xc90 [ 25.697332] ? mm_fault_error+0x2c0/0x2c0 [ 25.701452] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.706963] SyS_sendto+0x40/0x50 [ 25.710388] ? SyS_getpeername+0x30/0x30 [ 25.714424] do_syscall_64+0x282/0x940 [ 25.718281] ? __do_page_fault+0xc90/0xc90 [ 25.722489] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.727216] ? syscall_return_slowpath+0x550/0x550 [ 25.732120] ? syscall_return_slowpath+0x2ac/0x550 [ 25.737030] ? prepare_exit_to_usermode+0x350/0x350 [ 25.742029] ? retint_user+0x18/0x18 [ 25.745719] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.750538] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.755697] RIP: 0033:0x43fd99 [ 25.758857] RSP: 002b:00007ffc26d86b98 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.766538] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.773777] RDX: 000000000000ff4e RSI: 0000000020fbffff RDI: 0000000000000003 [ 25.781021] RBP: 00000000006ca018 R08: 0000000020fc9000 R09: 0000000000000010 [ 25.788266] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.795511] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.802883] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.810342] in_atomic(): 1, irqs_disabled(): 0, pid: 4087, name: syzkaller271598 [ 25.817879] 1 lock held by syzkaller271598/4087: [ 25.822639] #0: (rcu_read_lock){....}, at: [<00000000e09faef0>] __rds_conn_create+0xe46/0x1b50 [ 25.831595] CPU: 0 PID: 4087 Comm: syzkaller271598 Not tainted 4.15.0+ #308 [ 25.838670] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.847995] Call Trace: [ 25.850563] dump_stack+0x194/0x257 [ 25.854167] ? arch_local_irq_restore+0x53/0x53 [ 25.858811] ? print_lock+0x9f/0xa2 [ 25.862412] ? lockdep_print_held_locks+0xc4/0x130 [ 25.867336] ___might_sleep+0x2b2/0x470 [ 25.871290] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.877153] ? __debug_object_init+0x235/0x1040 [ 25.881798] ? debug_mutex_init+0x1c/0x60 [ 25.885920] __might_sleep+0x95/0x190 [ 25.889696] kmem_cache_alloc_trace+0x299/0x740 [ 25.894339] ? lock_acquire+0x1d5/0x580 [ 25.898284] ? lock_acquire+0x1d5/0x580 [ 25.902232] ? __rds_conn_create+0xe46/0x1b50 [ 25.906701] rds_loop_conn_alloc+0xc8/0x380 [ 25.910994] ? rds_loop_conn_free+0x290/0x290 [ 25.915464] ? __init_waitqueue_head+0x97/0x140 [ 25.920115] ? rcutorture_record_progress+0x10/0x10 [ 25.925104] ? __lockdep_init_map+0xe4/0x650 [ 25.929489] __rds_conn_create+0x112f/0x1b50 [ 25.933886] ? rds_conn_drop+0xb0/0xb0 [ 25.937746] ? find_held_lock+0x35/0x1d0 [ 25.941778] ? retint_kernel+0x10/0x10 [ 25.945638] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.950629] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.955364] ? retint_kernel+0x10/0x10 [ 25.959235] ? copy_user_enhanced_fast_string+0xe/0x20 [ 25.964485] ? copyin+0x91/0xb0 [ 25.967741] ? copy_page_from_iter+0x50e/0x7c0 [ 25.972300] ? _copy_from_iter+0xf30/0xf30 [ 25.976509] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.980893] ? rds_message_copy_from_user+0x29e/0x370 [ 25.986060] rds_conn_create_outgoing+0x3f/0x50 [ 25.990703] rds_sendmsg+0xda3/0x2390 [ 25.994472] ? avc_has_perm+0x43e/0x680 [ 25.998430] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.002905] ? find_held_lock+0x35/0x1d0 [ 26.006946] ? sock_has_perm+0x2a4/0x420 [ 26.010980] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.016313] ? lock_release+0xa22/0xa40 [ 26.020258] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.026117] ? __check_object_size+0x8b/0x530 [ 26.030581] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.035052] ? __might_sleep+0x95/0x190 [ 26.039001] ? selinux_socket_sendmsg+0x36/0x40 [ 26.043649] ? security_socket_sendmsg+0x89/0xb0 [ 26.048379] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.052849] sock_sendmsg+0xca/0x110 [ 26.056537] SYSC_sendto+0x361/0x5c0 [ 26.060227] ? SYSC_connect+0x4a0/0x4a0 [ 26.064180] ? __do_page_fault+0x5f7/0xc90 [ 26.068390] ? lock_downgrade+0x980/0x980 [ 26.072516] ? handle_mm_fault+0x43b/0x970 [ 26.076735] ? up_read+0x1a/0x40 [ 26.080075] ? __do_page_fault+0x3d6/0xc90 [ 26.084288] ? mm_fault_error+0x2c0/0x2c0 [ 26.088407] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.093918] SyS_sendto+0x40/0x50 [ 26.097342] ? SyS_getpeername+0x30/0x30 [ 26.101378] do_syscall_64+0x282/0x940 [ 26.105234] ? __do_page_fault+0xc90/0xc90 [ 26.109439] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.114166] ? syscall_return_slowpath+0x550/0x550 [ 26.119070] ? syscall_return_slowpath+0x2ac/0x550 [ 26.123970] ? prepare_exit_to_usermode+0x350/0x350 [ 26.128960] ? retint_user+0x18/0x18 [ 26.132650] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.137468] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.142627] RIP: 0033:0x43fd99 [ 26.145787] RSP: 002b:00007ffc26d86b98 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.153465] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.160707] RDX: 000000000000ff4e RSI: 000000002