[....] Starting enhanced syslogd: rsyslogd[ 15.096665] audit: type=1400 audit(1518422695.325:5): avc: denied { syslog } for pid=3943 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: [ 20.114265] audit: type=1400 audit(1518422700.343:6): avc: denied { map } for pid=4082 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 '10.128.0.19' (ECDSA) to the list of known hosts. executing program [ 26.399644] audit: type=1400 audit(1518422706.628:7): avc: denied { map } for pid=4096 comm="syzkaller286682" path="/root/syzkaller286682417" 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 [ 26.426601] [ 26.428283] ============================= [ 26.432434] WARNING: suspicious RCU usage [ 26.436581] 4.16.0-rc1+ #309 Not tainted [ 26.440640] ----------------------------- [ 26.444787] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 26.454060] [ 26.454060] other info that might help us debug this: [ 26.454060] [ 26.462213] [ 26.462213] rcu_scheduler_active = 2, debug_locks = 1 [ 26.468878] 1 lock held by syzkaller286682/4096: [ 26.473651] #0: (rcu_read_lock){....}, at: [<000000007451a17e>] __rds_conn_create+0xe46/0x1b50 [ 26.482607] [ 26.482607] stack backtrace: [ 26.487104] CPU: 0 PID: 4096 Comm: syzkaller286682 Not tainted 4.16.0-rc1+ #309 [ 26.494522] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.503846] Call Trace: [ 26.506412] dump_stack+0x194/0x257 [ 26.510023] ? arch_local_irq_restore+0x53/0x53 [ 26.514682] lockdep_rcu_suspicious+0x123/0x170 [ 26.519326] ___might_sleep+0x385/0x470 [ 26.523273] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.529127] ? __debug_object_init+0x235/0x1040 [ 26.533770] ? debug_mutex_init+0x1c/0x60 [ 26.537894] __might_sleep+0x95/0x190 [ 26.541670] kmem_cache_alloc_trace+0x299/0x740 [ 26.546313] ? lock_acquire+0x1d5/0x580 [ 26.550258] ? lock_acquire+0x1d5/0x580 [ 26.554207] ? __rds_conn_create+0xe46/0x1b50 [ 26.558681] rds_loop_conn_alloc+0xc8/0x380 [ 26.562978] ? rds_loop_conn_free+0x290/0x290 [ 26.567449] ? __init_waitqueue_head+0x97/0x140 [ 26.572095] ? rcutorture_record_progress+0x10/0x10 [ 26.577083] ? __lockdep_init_map+0xe4/0x650 [ 26.581472] __rds_conn_create+0x112f/0x1b50 [ 26.585872] ? rds_conn_drop+0xb0/0xb0 [ 26.589741] ? __raw_spin_lock_init+0x1c/0x100 [ 26.594297] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.599289] ? __lockdep_init_map+0xe4/0x650 [ 26.603672] ? lockdep_init_map+0x9/0x10 [ 26.607703] ? __init_waitqueue_head+0x97/0x140 [ 26.612343] ? init_wait_entry+0x1b0/0x1b0 [ 26.616574] ? lockdep_init_map+0x9/0x10 [ 26.620612] ? rds_message_alloc+0x28c/0x330 [ 26.624993] ? rds_message_next_extension+0x210/0x210 [ 26.630155] ? trace_hardirqs_on+0xd/0x10 [ 26.634280] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.638663] ? __release_sock+0x360/0x360 [ 26.642779] ? lock_sock_nested+0x91/0x110 [ 26.646989] rds_conn_create_outgoing+0x3f/0x50 [ 26.651637] rds_sendmsg+0xda3/0x2390 [ 26.655409] ? avc_has_perm+0x43e/0x680 [ 26.659370] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.663839] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.668307] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.673298] ? find_held_lock+0x35/0x1d0 [ 26.677341] ? sock_has_perm+0x2a4/0x420 [ 26.681374] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.686709] ? lock_release+0xa22/0xa40 [ 26.690660] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.696518] ? __check_object_size+0x8b/0x530 [ 26.700982] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.705456] ? __might_sleep+0x95/0x190 [ 26.709410] ? selinux_socket_sendmsg+0x36/0x40 [ 26.714056] ? security_socket_sendmsg+0x89/0xb0 [ 26.718784] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.723255] sock_sendmsg+0xca/0x110 [ 26.726946] SYSC_sendto+0x361/0x5c0 [ 26.730637] ? SYSC_connect+0x4a0/0x4a0 [ 26.734592] ? __do_page_fault+0x5f7/0xc90 [ 26.738803] ? lock_downgrade+0x980/0x980 [ 26.742932] ? handle_mm_fault+0x43b/0x970 [ 26.747152] ? up_read+0x1a/0x40 [ 26.750496] ? __do_page_fault+0x3d6/0xc90 [ 26.754710] ? mm_fault_error+0x2c0/0x2c0 [ 26.758833] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.764347] SyS_sendto+0x40/0x50 [ 26.767774] ? SyS_getpeername+0x30/0x30 [ 26.771895] do_syscall_64+0x282/0x940 [ 26.775765] ? __do_page_fault+0xc90/0xc90 [ 26.779974] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.784704] ? syscall_return_slowpath+0x550/0x550 [ 26.789795] ? syscall_return_slowpath+0x2ac/0x550 [ 26.794695] ? prepare_exit_to_usermode+0x350/0x350 [ 26.799685] ? retint_user+0x18/0x18 [ 26.803375] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.808196] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.813357] RIP: 0033:0x43fd99 [ 26.816517] RSP: 002b:00007ffdd51d2018 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.824195] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.831434] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 26.838678] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 26.845919] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.853158] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 26.860676] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.868133] in_atomic(): 1, irqs_disabled(): 0, pid: 4096, name: syzkaller286682 [ 26.875671] 1 lock held by syzkaller286682/4096: [ 26.880438] #0: (rcu_read_lock){....}, at: [<000000007451a17e>] __rds_conn_create+0xe46/0x1b50 [ 26.889418] CPU: 0 PID: 4096 Comm: syzkaller286682 Not tainted 4.16.0-rc1+ #309 [ 26.896845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.906168] Call Trace: [ 26.908732] dump_stack+0x194/0x257 [ 26.912334] ? arch_local_irq_restore+0x53/0x53 [ 26.916977] ? print_lock+0x9f/0xa2 [ 26.920575] ? lockdep_print_held_locks+0xc4/0x130 [ 26.925487] ___might_sleep+0x2b2/0x470 [ 26.929438] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.935317] ? __debug_object_init+0x235/0x1040 [ 26.939961] ? debug_mutex_init+0x1c/0x60 [ 26.944085] __might_sleep+0x95/0x190 [ 26.947863] kmem_cache_alloc_trace+0x299/0x740 [ 26.952508] ? lock_acquire+0x1d5/0x580 [ 26.956451] ? lock_acquire+0x1d5/0x580 [ 26.960401] ? __rds_conn_create+0xe46/0x1b50 [ 26.964871] rds_loop_conn_alloc+0xc8/0x380 [ 26.969168] ? rds_loop_conn_free+0x290/0x290 [ 26.973637] ? __init_waitqueue_head+0x97/0x140 [ 26.978280] ? rcutorture_record_progress+0x10/0x10 [ 26.983271] ? __lockdep_init_map+0xe4/0x650 [ 26.987655] __rds_conn_create+0x112f/0x1b50 [ 26.992060] ? rds_conn_drop+0xb0/0xb0 [ 26.995934] ? __raw_spin_lock_init+0x1c/0x100 [ 27.000490] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.005486] ? __lockdep_init_map+0xe4/0x650 [ 27.009870] ? lockdep_init_map+0x9/0x10 [ 27.013904] ? __init_waitqueue_head+0x97/0x140 [ 27.018544] ? init_wait_entry+0x1b0/0x1b0 [ 27.022753] ? lockdep_init_map+0x9/0x10 [ 27.026787] ? rds_message_alloc+0x28c/0x330 [ 27.031166] ? rds_message_next_extension+0x210/0x210 [ 27.036326] ? trace_hardirqs_on+0xd/0x10 [ 27.040450] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.044838] ? __release_sock+0x360/0x360 [ 27.048957] ? lock_sock_nested+0x91/0x110 [ 27.053168] rds_conn_create_outgoing+0x3f/0x50 [ 27.057810] rds_sendmsg+0xda3/0x2390 [ 27.061580] ? avc_has_perm+0x43e/0x680 [ 27.065540] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.070010] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.074490] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.079485] ? find_held_lock+0x35/0x1d0 [ 27.083528] ? sock_has_perm+0x2a4/0x420 [ 27.087565] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.092903] ? lock_release+0xa22/0xa40 [ 27.096848] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 27.102704] ? __check_object_size+0x8b/0x530 [ 27.107172] ? __handle_mm_fault+0x80e/0x3ce0 [ 27.111644] ? __might_sleep+0x95/0x190 [ 27.115594] ? selinux_socket_sendmsg+0x36/0x40 [ 27.120238] ? security_socket_sendmsg+0x89/0xb0 [ 27.124965] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.129433] sock_sendmsg+0xca/0x110 [ 27.133122] SYSC_sendto+0x361/0x5c0 [ 27.136810] ? SYSC_connect+0x4a0/0x4a0 [ 27.140761] ? __do_page_fault+0x5f7/0xc90 [ 27.144969] ? lock_downgrade+0x980/0x980 [ 27.149097] ? handle_mm_fault+0x43b/0x970 [ 27.153315] ? up_read+0x1a/0x40 [ 27.156654] ? __do_page_fault+0x3d6/0xc90 [ 27.160870] ? mm_fault_error+0x2c0/0x2c0 [ 27.164993] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 27.170511] SyS_sendto+0x40/0x50 [ 27.173936] ? SyS_getpeername+0x30/0x30 [ 27.177969] do_syscall_64+0x282/0x940 [ 27.181828] ? __do_page_fault+0xc90/0xc90 [ 27.186039] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.190771] ? syscall_return_slowpath+0x550/0x550 [ 27.195672] ? syscall_return_slowpath+0x2ac/0x550 [ 27.200574] ? prepare_exit_to_usermode+0x350/0x350 [ 27.205563] ? retint_user+0x18/0x18 [ 27.209254] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.214077] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 27.219237] RIP: 0033:0x43fd99 [ 27.222397] RSP: 002b:00007ffdd51d2018 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 27.230076] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 27.237315] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 27.244555] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 27.251793] R10: