[....] Starting enhanced syslogd: rsyslogd[ 16.652416] audit: type=1400 audit(1518416832.203:5): avc: denied { syslog } for pid=4041 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: [ 18.947429] audit: type=1400 audit(1518416834.498:6): avc: denied { map } for pid=4180 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 '10.128.0.18' (ECDSA) to the list of known hosts. executing program [ 25.282645] audit: type=1400 audit(1518416840.833:7): avc: denied { map } for pid=4194 comm="syzkaller503483" path="/root/syzkaller503483379" 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 [ 25.309843] [ 25.311539] ============================= [ 25.315845] WARNING: suspicious RCU usage [ 25.320008] 4.16.0-rc1+ #219 Not tainted [ 25.324103] ----------------------------- [ 25.328263] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.337546] [ 25.337546] other info that might help us debug this: [ 25.337546] [ 25.345700] [ 25.345700] rcu_scheduler_active = 2, debug_locks = 1 [ 25.352374] 1 lock held by syzkaller503483/4194: [ 25.357314] #0: (rcu_read_lock){....}, at: [<00000000f52ae5c1>] __rds_conn_create+0xe46/0x1b50 [ 25.366274] [ 25.366274] stack backtrace: [ 25.370784] CPU: 1 PID: 4194 Comm: syzkaller503483 Not tainted 4.16.0-rc1+ #219 [ 25.378210] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.387537] Call Trace: [ 25.390103] dump_stack+0x194/0x257 [ 25.393708] ? arch_local_irq_restore+0x53/0x53 [ 25.398362] lockdep_rcu_suspicious+0x123/0x170 [ 25.403006] ___might_sleep+0x385/0x470 [ 25.406961] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.412819] ? __debug_object_init+0x235/0x1040 [ 25.417463] ? debug_mutex_init+0x1c/0x60 [ 25.421590] __might_sleep+0x95/0x190 [ 25.425370] kmem_cache_alloc_trace+0x299/0x740 [ 25.430274] ? lock_acquire+0x1d5/0x580 [ 25.434219] ? lock_acquire+0x1d5/0x580 [ 25.438168] ? __rds_conn_create+0xe46/0x1b50 [ 25.442640] rds_loop_conn_alloc+0xc8/0x380 [ 25.446940] ? rds_loop_conn_free+0x290/0x290 [ 25.451503] ? __init_waitqueue_head+0x97/0x140 [ 25.456149] ? rcutorture_record_progress+0x10/0x10 [ 25.461140] ? __lockdep_init_map+0xe4/0x650 [ 25.465527] __rds_conn_create+0x112f/0x1b50 [ 25.469926] ? rds_conn_drop+0xb0/0xb0 [ 25.473797] ? __raw_spin_lock_init+0x1c/0x100 [ 25.478352] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.483347] ? __lockdep_init_map+0xe4/0x650 [ 25.487731] ? lockdep_init_map+0x9/0x10 [ 25.491765] ? __init_waitqueue_head+0x97/0x140 [ 25.496410] ? init_wait_entry+0x1b0/0x1b0 [ 25.500622] ? lockdep_init_map+0x9/0x10 [ 25.504658] ? rds_message_alloc+0x28c/0x330 [ 25.509039] ? rds_message_next_extension+0x210/0x210 [ 25.514205] ? trace_hardirqs_on+0xd/0x10 [ 25.518336] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.522851] ? __release_sock+0x360/0x360 [ 25.526977] ? lock_sock_nested+0x91/0x110 [ 25.531193] rds_conn_create_outgoing+0x3f/0x50 [ 25.535844] rds_sendmsg+0xda3/0x2390 [ 25.539622] ? avc_has_perm+0x43e/0x680 [ 25.543583] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.548058] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.552537] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.557530] ? find_held_lock+0x35/0x1d0 [ 25.561573] ? sock_has_perm+0x2a4/0x420 [ 25.565617] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.570953] ? lock_release+0xa22/0xa40 [ 25.574900] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.580765] ? __check_object_size+0x8b/0x530 [ 25.585241] ? __might_sleep+0x95/0x190 [ 25.589192] ? selinux_socket_sendmsg+0x36/0x40 [ 25.593834] ? security_socket_sendmsg+0x89/0xb0 [ 25.598563] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.603034] sock_sendmsg+0xca/0x110 [ 25.606725] SYSC_sendto+0x361/0x5c0 [ 25.610504] ? SYSC_connect+0x4a0/0x4a0 [ 25.614454] ? find_held_lock+0x35/0x1d0 [ 25.618500] ? lock_downgrade+0x980/0x980 [ 25.622642] ? up_read+0x1a/0x40 [ 25.625981] ? __do_page_fault+0x3d6/0xc90 [ 25.630195] SyS_sendto+0x40/0x50 [ 25.633625] ? SyS_getpeername+0x30/0x30 [ 25.637660] do_fast_syscall_32+0x3ee/0xfa1 [ 25.641963] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.646517] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.651249] ? syscall_return_slowpath+0x550/0x550 [ 25.656152] ? syscall_return_slowpath+0x2ac/0x550 [ 25.661063] ? prepare_exit_to_usermode+0x350/0x350 [ 25.666053] ? retint_user+0x18/0x18 [ 25.669752] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.674576] entry_SYSENTER_compat+0x54/0x63 [ 25.678957] RIP: 0023:0xf7f22c79 [ 25.682293] RSP: 002b:00000000ffdfcf5c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 25.689974] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 25.697218] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020062000 [ 25.704480] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 25.711728] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.718978] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.726496] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.733967] in_atomic(): 1, irqs_disabled(): 0, pid: 4194, name: syzkaller503483 [ 25.741518] 1 lock held by syzkaller503483/4194: [ 25.746276] #0: (rcu_read_lock){....}, at: [<00000000f52ae5c1>] __rds_conn_create+0xe46/0x1b50 [ 25.755236] CPU: 1 PID: 4194 Comm: syzkaller503483 Not tainted 4.16.0-rc1+ #219 [ 25.762664] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.771993] Call Trace: [ 25.774562] dump_stack+0x194/0x257 [ 25.778164] ? arch_local_irq_restore+0x53/0x53 [ 25.782819] ? print_lock+0x9f/0xa2 [ 25.786418] ? lockdep_print_held_locks+0xc4/0x130 [ 25.791328] ___might_sleep+0x2b2/0x470 [ 25.795291] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.801166] ? __debug_object_init+0x235/0x1040 [ 25.805814] ? debug_mutex_init+0x1c/0x60 [ 25.809939] __might_sleep+0x95/0x190 [ 25.813719] kmem_cache_alloc_trace+0x299/0x740 [ 25.818368] ? lock_acquire+0x1d5/0x580 [ 25.822313] ? lock_acquire+0x1d5/0x580 [ 25.826259] ? __rds_conn_create+0xe46/0x1b50 [ 25.830739] rds_loop_conn_alloc+0xc8/0x380 [ 25.835036] ? rds_loop_conn_free+0x290/0x290 [ 25.839507] ? __init_waitqueue_head+0x97/0x140 [ 25.844149] ? rcutorture_record_progress+0x10/0x10 [ 25.849138] ? __lockdep_init_map+0xe4/0x650 [ 25.853523] __rds_conn_create+0x112f/0x1b50 [ 25.857922] ? rds_conn_drop+0xb0/0xb0 [ 25.861792] ? __raw_spin_lock_init+0x1c/0x100 [ 25.866347] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.871339] ? __lockdep_init_map+0xe4/0x650 [ 25.875724] ? lockdep_init_map+0x9/0x10 [ 25.879756] ? __init_waitqueue_head+0x97/0x140 [ 25.884397] ? init_wait_entry+0x1b0/0x1b0 [ 25.888610] ? lockdep_init_map+0x9/0x10 [ 25.892647] ? rds_message_alloc+0x28c/0x330 [ 25.897034] ? rds_message_next_extension+0x210/0x210 [ 25.902197] ? trace_hardirqs_on+0xd/0x10 [ 25.906324] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.910712] ? __release_sock+0x360/0x360 [ 25.914831] ? lock_sock_nested+0x91/0x110 [ 25.919044] rds_conn_create_outgoing+0x3f/0x50 [ 25.923691] rds_sendmsg+0xda3/0x2390 [ 25.927465] ? avc_has_perm+0x43e/0x680 [ 25.931425] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.935894] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.940364] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.945356] ? find_held_lock+0x35/0x1d0 [ 25.949399] ? sock_has_perm+0x2a4/0x420 [ 25.953433] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.958769] ? lock_release+0xa22/0xa40 [ 25.962716] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.968575] ? __check_object_size+0x8b/0x530 [ 25.973050] ? __might_sleep+0x95/0x190 [ 25.977006] ? selinux_socket_sendmsg+0x36/0x40 [ 25.981659] ? security_socket_sendmsg+0x89/0xb0 [ 25.986387] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.990861] sock_sendmsg+0xca/0x110 [ 25.994551] SYSC_sendto+0x361/0x5c0 [ 25.998238] ? SYSC_connect+0x4a0/0x4a0 [ 26.002188] ? find_held_lock+0x35/0x1d0 [ 26.006666] ? lock_downgrade+0x980/0x980 [ 26.010806] ? up_read+0x1a/0x40 [ 26.014146] ? __do_page_fault+0x3d6/0xc90 [ 26.018361] SyS_sendto+0x40/0x50 [ 26.021787] ? SyS_getpeername+0x30/0x30 [ 26.025821] do_fast_syscall_32+0x3ee/0xfa1 [ 26.030124] ? do_int80_syscall_32+0x9d0/0x9d0 [ 26.034677] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.039408] ? syscall_return_slowpath+0x550/0x550 [ 26.044309] ? syscall_return_slowpath+0x2ac/0x550 [ 26.049211] ? prepare_exit_to_usermode+0x350/0x350 [ 26.054200] ? retint_user+0x18/0x18 [ 26.057892] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.062713] entry_SYSENTER_compat+0x54/0x63 [ 26.067093] RIP: 0023:0xf7f22c79 [ 26.070427] RSP: 002b:00000000ffdfcf5c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 26.078108] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 26.0853