[....] Starting enhanced syslogd: rsyslogd[ 15.002831] audit: type=1400 audit(1518376216.353:5): avc: denied { syslog } for pid=4006 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: [ 18.103282] audit: type=1400 audit(1518376219.454:6): avc: denied { map } for pid=4147 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 '10.128.0.10' (ECDSA) to the list of known hosts. executing program [ 32.329618] audit: type=1400 audit(1518376233.680:7): avc: denied { map } for pid=4164 comm="syzkaller360061" path="/root/syzkaller360061042" 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 [ 32.356339] [ 32.358031] ============================= [ 32.362189] WARNING: suspicious RCU usage [ 32.366340] 4.15.0+ #218 Not tainted [ 32.370054] ----------------------------- [ 32.374200] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 32.383478] [ 32.383478] other info that might help us debug this: [ 32.383478] [ 32.391628] [ 32.391628] rcu_scheduler_active = 2, debug_locks = 1 [ 32.398298] 1 lock held by syzkaller360061/4164: [ 32.403051] #0: (rcu_read_lock){....}, at: [<00000000e5c1ac78>] __rds_conn_create+0xe46/0x1b50 [ 32.412017] [ 32.412017] stack backtrace: [ 32.416513] CPU: 0 PID: 4164 Comm: syzkaller360061 Not tainted 4.15.0+ #218 [ 32.423585] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.432924] Call Trace: [ 32.435485] dump_stack+0x194/0x257 [ 32.439087] ? arch_local_irq_restore+0x53/0x53 [ 32.443740] lockdep_rcu_suspicious+0x123/0x170 [ 32.448385] ___might_sleep+0x385/0x470 [ 32.452332] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 32.458188] ? __debug_object_init+0x235/0x1040 [ 32.462832] ? debug_mutex_init+0x1c/0x60 [ 32.466955] __might_sleep+0x95/0x190 [ 32.470734] kmem_cache_alloc_trace+0x299/0x740 [ 32.475374] ? lock_acquire+0x1d5/0x580 [ 32.479319] ? lock_acquire+0x1d5/0x580 [ 32.483264] ? __rds_conn_create+0xe46/0x1b50 [ 32.487745] rds_loop_conn_alloc+0xc8/0x380 [ 32.492040] ? rds_loop_conn_free+0x290/0x290 [ 32.496506] ? __init_waitqueue_head+0x97/0x140 [ 32.501149] ? rcutorture_record_progress+0x10/0x10 [ 32.506137] ? __lockdep_init_map+0xe4/0x650 [ 32.510528] __rds_conn_create+0x112f/0x1b50 [ 32.514930] ? rds_conn_drop+0xb0/0xb0 [ 32.518802] ? __raw_spin_lock_init+0x1c/0x100 [ 32.523357] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.528352] ? __lockdep_init_map+0xe4/0x650 [ 32.532742] ? lockdep_init_map+0x9/0x10 [ 32.536787] ? __init_waitqueue_head+0x97/0x140 [ 32.541431] ? init_wait_entry+0x1b0/0x1b0 [ 32.545643] ? lockdep_init_map+0x9/0x10 [ 32.549684] ? rds_message_alloc+0x28c/0x330 [ 32.554065] ? rds_message_next_extension+0x210/0x210 [ 32.559226] ? trace_hardirqs_on+0xd/0x10 [ 32.563350] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.567732] ? __release_sock+0x360/0x360 [ 32.571859] ? lock_sock_nested+0x91/0x110 [ 32.576068] rds_conn_create_outgoing+0x3f/0x50 [ 32.580712] rds_sendmsg+0xda3/0x2390 [ 32.584485] ? avc_has_perm+0x43e/0x680 [ 32.588443] ? rds_send_drop_to+0x19d0/0x19d0 [ 32.592911] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.597379] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.602371] ? find_held_lock+0x35/0x1d0 [ 32.606414] ? sock_has_perm+0x2a4/0x420 [ 32.610576] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 32.615916] ? lock_release+0xa22/0xa40 [ 32.619862] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 32.625719] ? __check_object_size+0x8b/0x530 [ 32.630192] ? __might_sleep+0x95/0x190 [ 32.634155] ? selinux_socket_sendmsg+0x36/0x40 [ 32.638805] ? security_socket_sendmsg+0x89/0xb0 [ 32.643545] ? rds_send_drop_to+0x19d0/0x19d0 [ 32.648017] sock_sendmsg+0xca/0x110 [ 32.651707] SYSC_sendto+0x361/0x5c0 [ 32.655397] ? SYSC_connect+0x4a0/0x4a0 [ 32.659347] ? find_held_lock+0x35/0x1d0 [ 32.663397] ? lock_downgrade+0x980/0x980 [ 32.667539] ? up_read+0x1a/0x40 [ 32.670880] ? __do_page_fault+0x3d6/0xc90 [ 32.675096] SyS_sendto+0x40/0x50 [ 32.678520] ? SyS_getpeername+0x30/0x30 [ 32.682554] do_fast_syscall_32+0x3ee/0xfa1 [ 32.686867] ? do_int80_syscall_32+0x9d0/0x9d0 [ 32.691422] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.696152] ? syscall_return_slowpath+0x550/0x550 [ 32.701056] ? syscall_return_slowpath+0x2ac/0x550 [ 32.705958] ? prepare_exit_to_usermode+0x350/0x350 [ 32.710948] ? retint_user+0x18/0x18 [ 32.714637] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.719457] entry_SYSENTER_compat+0x54/0x63 [ 32.723837] RIP: 0023:0xf7f14c79 [ 32.727171] RSP: 002b:00000000ffd23d1c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 32.734853] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 32.742092] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020af3ff0 [ 32.749332] RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000 [ 32.756572] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 32.763813] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 32.771166] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 32.778614] in_atomic(): 1, irqs_disabled(): 0, pid: 4164, name: syzkaller360061 [ 32.786151] 1 lock held by syzkaller360061/4164: [ 32.790899] #0: (rcu_read_lock){....}, at: [<00000000e5c1ac78>] __rds_conn_create+0xe46/0x1b50 [ 32.799848] CPU: 0 PID: 4164 Comm: syzkaller360061 Not tainted 4.15.0+ #218 [ 32.806919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.816246] Call Trace: [ 32.818811] dump_stack+0x194/0x257 [ 32.822412] ? arch_local_irq_restore+0x53/0x53 [ 32.827054] ? print_lock+0x9f/0xa2 [ 32.830655] ? lockdep_print_held_locks+0xc4/0x130 [ 32.835560] ___might_sleep+0x2b2/0x470 [ 32.839507] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 32.845362] ? __debug_object_init+0x235/0x1040 [ 32.850005] ? debug_mutex_init+0x1c/0x60 [ 32.854132] __might_sleep+0x95/0x190 [ 32.857911] kmem_cache_alloc_trace+0x299/0x740 [ 32.862555] ? lock_acquire+0x1d5/0x580 [ 32.866502] ? lock_acquire+0x1d5/0x580 [ 32.870447] ? __rds_conn_create+0xe46/0x1b50 [ 32.874924] rds_loop_conn_alloc+0xc8/0x380 [ 32.879226] ? rds_loop_conn_free+0x290/0x290 [ 32.883701] ? __init_waitqueue_head+0x97/0x140 [ 32.888346] ? rcutorture_record_progress+0x10/0x10 [ 32.893337] ? __lockdep_init_map+0xe4/0x650 [ 32.897722] __rds_conn_create+0x112f/0x1b50 [ 32.902120] ? rds_conn_drop+0xb0/0xb0 [ 32.905987] ? __raw_spin_lock_init+0x1c/0x100 [ 32.910539] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.915533] ? __lockdep_init_map+0xe4/0x650 [ 32.919917] ? lockdep_init_map+0x9/0x10 [ 32.923951] ? __init_waitqueue_head+0x97/0x140 [ 32.928593] ? init_wait_entry+0x1b0/0x1b0 [ 32.932802] ? lockdep_init_map+0x9/0x10 [ 32.936854] ? rds_message_alloc+0x28c/0x330 [ 32.941240] ? rds_message_next_extension+0x210/0x210 [ 32.946401] ? trace_hardirqs_on+0xd/0x10 [ 32.950523] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.954907] ? __release_sock+0x360/0x360 [ 32.959026] ? lock_sock_nested+0x91/0x110 [ 32.963251] rds_conn_create_outgoing+0x3f/0x50 [ 32.967895] rds_sendmsg+0xda3/0x2390 [ 32.971678] ? avc_has_perm+0x43e/0x680 [ 32.975640] ? rds_send_drop_to+0x19d0/0x19d0 [ 32.980112] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.984591] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.989582] ? find_held_lock+0x35/0x1d0 [ 32.993622] ? sock_has_perm+0x2a4/0x420 [ 32.997657] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 33.002990] ? lock_release+0xa22/0xa40 [ 33.006936] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 33.012801] ? __check_object_size+0x8b/0x530 [ 33.017275] ? __might_sleep+0x95/0x190 [ 33.021223] ? selinux_socket_sendmsg+0x36/0x40 [ 33.025865] ? security_socket_sendmsg+0x89/0xb0 [ 33.030592] ? rds_send_drop_to+0x19d0/0x19d0 [ 33.035062] sock_sendmsg+0xca/0x110 [ 33.038748] SYSC_sendto+0x361/0x5c0 [ 33.042436] ? SYSC_connect+0x4a0/0x4a0 [ 33.046387] ? find_held_lock+0x35/0x1d0 [ 33.050428] ? lock_downgrade+0x980/0x980 [ 33.054573] ? up_read+0x1a/0x40 [ 33.057915] ? __do_page_fault+0x3d6/0xc90 [ 33.062131] SyS_sendto+0x40/0x50 [ 33.065556] ? SyS_getpeername+0x30/0x30 [ 33.069591] do_fast_syscall_32+0x3ee/0xfa1 [ 33.073892] ? do_int80_syscall_32+0x9d0/0x9d0 [ 33.078445] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.083173] ? syscall_return_slowpath+0x550/0x550 [ 33.088077] ? syscall_return_slowpath+0x2ac/0x550 [ 33.092983] ? prepare_exit_to_usermode+0x350/0x350 [ 33.097972] ? retint_user+0x18/0x18 [ 33.101663] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.106482] entry_SYSENTER_compat+0x54/0x63 [ 33.110863] RIP: 0023:0xf7f14c79 [ 33.114196] RSP: 002b:00000000ffd23d1c EFLAGS: 00000286 ORIG_RAX: 0000000000000171 [ 33.121876] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020218000 [ 33.129120] RDX: 0000000000000000 RSI: 0000000