[....] Starting enhanced syslogd: rsyslogd[ 16.170879] audit: type=1400 audit(1518861533.028:5): avc: denied { syslog } for pid=4011 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 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.914745] audit: type=1400 audit(1518861535.772:6): avc: denied { map } for pid=4150 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 [ 28.347975] audit: type=1400 audit(1518861545.205:7): avc: denied { map } for pid=4164 comm="syzkaller046804" path="/root/syzkaller046804060" 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 [ 28.374866] [ 28.376562] ============================= [ 28.380726] WARNING: suspicious RCU usage [ 28.384889] 4.16.0-rc1+ #316 Not tainted [ 28.388967] ----------------------------- [ 28.393121] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 28.402420] [ 28.402420] other info that might help us debug this: [ 28.402420] [ 28.410566] [ 28.410566] rcu_scheduler_active = 2, debug_locks = 1 [ 28.417238] 1 lock held by syzkaller046804/4164: [ 28.421981] #0: (rcu_read_lock){....}, at: [<00000000e85fc9e8>] __rds_conn_create+0xe46/0x1b50 [ 28.430967] [ 28.430967] stack backtrace: [ 28.435478] CPU: 1 PID: 4164 Comm: syzkaller046804 Not tainted 4.16.0-rc1+ #316 [ 28.443077] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.452404] Call Trace: [ 28.454970] dump_stack+0x194/0x257 [ 28.458574] ? arch_local_irq_restore+0x53/0x53 [ 28.463231] lockdep_rcu_suspicious+0x123/0x170 [ 28.467877] ___might_sleep+0x385/0x470 [ 28.471827] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.477686] ? __debug_object_init+0x235/0x1040 [ 28.482330] ? debug_mutex_init+0x1c/0x60 [ 28.486454] __might_sleep+0x95/0x190 [ 28.490233] kmem_cache_alloc_trace+0x299/0x740 [ 28.494874] ? lock_acquire+0x1d5/0x580 [ 28.498820] ? lock_acquire+0x1d5/0x580 [ 28.502768] ? __rds_conn_create+0xe46/0x1b50 [ 28.507242] rds_loop_conn_alloc+0xc8/0x380 [ 28.511537] ? rds_loop_conn_free+0x290/0x290 [ 28.516006] ? __init_waitqueue_head+0x97/0x140 [ 28.520654] ? rcutorture_record_progress+0x10/0x10 [ 28.525643] ? __lockdep_init_map+0xe4/0x650 [ 28.530638] __rds_conn_create+0x112f/0x1b50 [ 28.535036] ? rds_conn_drop+0xb0/0xb0 [ 28.538906] ? __raw_spin_lock_init+0x1c/0x100 [ 28.543473] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.548468] ? __lockdep_init_map+0xe4/0x650 [ 28.552858] ? lockdep_init_map+0x9/0x10 [ 28.556901] ? __init_waitqueue_head+0x97/0x140 [ 28.561543] ? init_wait_entry+0x1b0/0x1b0 [ 28.565766] ? lockdep_init_map+0x9/0x10 [ 28.569800] ? rds_message_alloc+0x28c/0x330 [ 28.574183] ? rds_message_next_extension+0x210/0x210 [ 28.579348] ? trace_hardirqs_on+0xd/0x10 [ 28.583484] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.587872] ? __release_sock+0x360/0x360 [ 28.591992] ? lock_sock_nested+0x91/0x110 [ 28.596207] rds_conn_create_outgoing+0x3f/0x50 [ 28.600853] rds_sendmsg+0xda3/0x2390 [ 28.604626] ? avc_has_perm+0x43e/0x680 [ 28.608586] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.613051] ? _raw_spin_unlock_irq+0x27/0x70 [ 28.617520] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.622512] ? find_held_lock+0x35/0x1d0 [ 28.626556] ? sock_has_perm+0x2a4/0x420 [ 28.630592] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 28.635941] ? lock_release+0x9a2/0xa40 [ 28.639902] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.645761] ? __check_object_size+0x8b/0x530 [ 28.650229] ? __handle_mm_fault+0x80e/0x3ce0 [ 28.654701] ? __might_sleep+0x95/0x190 [ 28.658654] ? selinux_socket_sendmsg+0x36/0x40 [ 28.663295] ? security_socket_sendmsg+0x89/0xb0 [ 28.668037] ? rds_send_drop_to+0x19d0/0x19d0 [ 28.672507] sock_sendmsg+0xca/0x110 [ 28.676197] SYSC_sendto+0x361/0x5c0 [ 28.679894] ? SYSC_connect+0x4a0/0x4a0 [ 28.683851] ? __do_page_fault+0x5f7/0xc90 [ 28.688060] ? lock_downgrade+0x980/0x980 [ 28.692187] ? handle_mm_fault+0x43b/0x970 [ 28.696410] ? up_read+0x1a/0x40 [ 28.699759] ? __do_page_fault+0x3d6/0xc90 [ 28.703973] ? mm_fault_error+0x2c0/0x2c0 [ 28.708095] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 28.713616] SyS_sendto+0x40/0x50 [ 28.717048] ? SyS_getpeername+0x30/0x30 [ 28.721084] do_syscall_64+0x280/0x940 [ 28.724948] ? __do_page_fault+0xc90/0xc90 [ 28.729155] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 28.733894] ? syscall_return_slowpath+0x550/0x550 [ 28.738795] ? syscall_return_slowpath+0x2ac/0x550 [ 28.743702] ? prepare_exit_to_usermode+0x350/0x350 [ 28.748696] ? retint_user+0x18/0x18 [ 28.752387] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.757210] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 28.762374] RIP: 0033:0x43fd99 [ 28.765537] RSP: 002b:00007ffd80ba9468 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 28.773218] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 28.780469] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 28.787711] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 28.794952] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 28.802191] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 28.809500] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 28.816950] in_atomic(): 1, irqs_disabled(): 0, pid: 4164, name: syzkaller046804 [ 28.824505] 1 lock held by syzkaller046804/4164: [ 28.829260] #0: (rcu_read_lock){....}, at: [<00000000e85fc9e8>] __rds_conn_create+0xe46/0x1b50 [ 28.838227] CPU: 1 PID: 4164 Comm: syzkaller046804 Not tainted 4.16.0-rc1+ #316 [ 28.845648] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.854975] Call Trace: [ 28.857545] dump_stack+0x194/0x257 [ 28.861158] ? arch_local_irq_restore+0x53/0x53 [ 28.865824] ? print_lock+0x9f/0xa2 [ 28.869432] ? lockdep_print_held_locks+0xc4/0x130 [ 28.874348] ___might_sleep+0x2b2/0x470 [ 28.878297] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 28.884154] ? __debug_object_init+0x235/0x1040 [ 28.888796] ? debug_mutex_init+0x1c/0x60 [ 28.892923] __might_sleep+0x95/0x190 [ 28.896706] kmem_cache_alloc_trace+0x299/0x740 [ 28.901351] ? lock_acquire+0x1d5/0x580 [ 28.905299] ? lock_acquire+0x1d5/0x580 [ 28.909253] ? __rds_conn_create+0xe46/0x1b50 [ 28.913737] rds_loop_conn_alloc+0xc8/0x380 [ 28.918033] ? rds_loop_conn_free+0x290/0x290 [ 28.922504] ? __init_waitqueue_head+0x97/0x140 [ 28.927153] ? rcutorture_record_progress+0x10/0x10 [ 28.932148] ? __lockdep_init_map+0xe4/0x650 [ 28.936537] __rds_conn_create+0x112f/0x1b50 [ 28.940937] ? rds_conn_drop+0xb0/0xb0 [ 28.944806] ? __raw_spin_lock_init+0x1c/0x100 [ 28.949362] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 28.954359] ? __lockdep_init_map+0xe4/0x650 [ 28.958757] ? lockdep_init_map+0x9/0x10 [ 28.962789] ? __init_waitqueue_head+0x97/0x140 [ 28.967432] ? init_wait_entry+0x1b0/0x1b0 [ 28.971643] ? lockdep_init_map+0x9/0x10 [ 28.975678] ? rds_message_alloc+0x28c/0x330 [ 28.980063] ? rds_message_next_extension+0x210/0x210 [ 28.985226] ? trace_hardirqs_on+0xd/0x10 [ 28.989353] ? _raw_spin_unlock_bh+0x30/0x40 [ 28.993742] ? __release_sock+0x360/0x360 [ 28.997861] ? lock_sock_nested+0x91/0x110 [ 29.002071] rds_conn_create_outgoing+0x3f/0x50 [ 29.006720] rds_sendmsg+0xda3/0x2390 [ 29.010500] ? avc_has_perm+0x43e/0x680 [ 29.014463] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.018932] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.023402] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.028394] ? find_held_lock+0x35/0x1d0 [ 29.032435] ? sock_has_perm+0x2a4/0x420 [ 29.036473] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 29.041933] ? lock_release+0x9a2/0xa40 [ 29.045890] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 29.051752] ? __check_object_size+0x8b/0x530 [ 29.056223] ? __handle_mm_fault+0x80e/0x3ce0 [ 29.060714] ? __might_sleep+0x95/0x190 [ 29.064847] ? selinux_socket_sendmsg+0x36/0x40 [ 29.069497] ? security_socket_sendmsg+0x89/0xb0 [ 29.074228] ? rds_send_drop_to+0x19d0/0x19d0 [ 29.078702] sock_sendmsg+0xca/0x110 [ 29.082395] SYSC_sendto+0x361/0x5c0 [ 29.086084] ? SYSC_connect+0x4a0/0x4a0 [ 29.090037] ? __do_page_fault+0x5f7/0xc90 [ 29.094247] ? lock_downgrade+0x980/0x980 [ 29.098374] ? handle_mm_fault+0x43b/0x970 [ 29.102594] ? up_read+0x1a/0x40 [ 29.105933] ? __do_page_fault+0x3d6/0xc90 [ 29.110152] ? mm_fault_error+0x2c0/0x2c0 [ 29.114276] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 29.119791] SyS_sendto+0x40/0x50 [ 29.123219] ? SyS_getpeername+0x30/0x30 [ 29.127251] do_syscall_64+0x280/0x940 [ 29.131111] ? __do_page_fault+0xc90/0xc90 [ 29.135321] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 29.140050] ? syscall_return_slowpath+0x550/0x550 [ 29.144952] ? syscall_return_slowpath+0x2ac/0x550 [ 29.149853] ? prepare_exit_to_usermode+0x350/0x350 [ 29.154843] ? retint_user+0x18/0x18 [ 29.158542] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.163364] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 29.168525] RIP: 0033:0x43fd99 [ 29.171687] RSP: 002b:00007ffd80ba9468 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 29.179375] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 29.186619] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 29.193861] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 29.201