[....] Starting enhanced syslogd: rsyslogd[ 16.190328] audit: type=1400 audit(1518273168.041:5): avc: denied { syslog } for pid=4007 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: [ 18.337807] audit: type=1400 audit(1518273170.188:6): avc: denied { map } for pid=4145 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 '10.128.0.49' (ECDSA) to the list of known hosts. executing program [ 24.651637] audit: type=1400 audit(1518273176.502:7): avc: denied { map } for pid=4159 comm="syzkaller045487" path="/root/syzkaller045487093" 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 [ 24.678980] [ 24.680684] ============================= [ 24.684833] WARNING: suspicious RCU usage [ 24.688988] 4.15.0+ #307 Not tainted [ 24.692707] ----------------------------- [ 24.696873] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.706150] [ 24.706150] other info that might help us debug this: [ 24.706150] [ 24.714308] [ 24.714308] rcu_scheduler_active = 2, debug_locks = 1 [ 24.720983] 1 lock held by syzkaller045487/4159: [ 24.725754] #0: (rcu_read_lock){....}, at: [<000000002d9b1b92>] __rds_conn_create+0xe46/0x1b50 [ 24.734705] [ 24.734705] stack backtrace: [ 24.739210] CPU: 1 PID: 4159 Comm: syzkaller045487 Not tainted 4.15.0+ #307 [ 24.746281] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.755610] Call Trace: [ 24.758184] dump_stack+0x194/0x257 [ 24.761794] ? arch_local_irq_restore+0x53/0x53 [ 24.766446] lockdep_rcu_suspicious+0x123/0x170 [ 24.771092] ___might_sleep+0x385/0x470 [ 24.775043] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.780898] ? __debug_object_init+0x235/0x1040 [ 24.785549] ? debug_mutex_init+0x1c/0x60 [ 24.789675] __might_sleep+0x95/0x190 [ 24.793454] kmem_cache_alloc_trace+0x299/0x740 [ 24.798095] ? lock_acquire+0x1d5/0x580 [ 24.802054] ? lock_acquire+0x1d5/0x580 [ 24.806005] ? __rds_conn_create+0xe46/0x1b50 [ 24.810484] rds_loop_conn_alloc+0xc8/0x380 [ 24.814787] ? rds_loop_conn_free+0x290/0x290 [ 24.819258] ? __init_waitqueue_head+0x97/0x140 [ 24.823908] ? rcutorture_record_progress+0x10/0x10 [ 24.828897] ? __lockdep_init_map+0xe4/0x650 [ 24.833285] __rds_conn_create+0x112f/0x1b50 [ 24.837683] ? rds_conn_drop+0xb0/0xb0 [ 24.841558] ? __raw_spin_lock_init+0x1c/0x100 [ 24.846113] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.851106] ? __lockdep_init_map+0xe4/0x650 [ 24.855490] ? lockdep_init_map+0x9/0x10 [ 24.859524] ? __init_waitqueue_head+0x97/0x140 [ 24.864167] ? init_wait_entry+0x1b0/0x1b0 [ 24.868377] ? lockdep_init_map+0x9/0x10 [ 24.872411] ? rds_message_alloc+0x28c/0x330 [ 24.876798] ? rds_message_next_extension+0x210/0x210 [ 24.881958] ? trace_hardirqs_on+0xd/0x10 [ 24.886084] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.890467] ? __release_sock+0x360/0x360 [ 24.894591] ? lock_sock_nested+0x91/0x110 [ 24.898800] rds_conn_create_outgoing+0x3f/0x50 [ 24.903442] rds_sendmsg+0xda3/0x2390 [ 24.907212] ? avc_has_perm+0x43e/0x680 [ 24.911171] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.915643] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.920111] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.925102] ? find_held_lock+0x35/0x1d0 [ 24.929142] ? sock_has_perm+0x2a4/0x420 [ 24.933181] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.938513] ? lock_release+0xa02/0xa40 [ 24.942460] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.948315] ? __check_object_size+0x8b/0x530 [ 24.952782] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.957259] ? __might_sleep+0x95/0x190 [ 24.961211] ? selinux_socket_sendmsg+0x36/0x40 [ 24.965849] ? security_socket_sendmsg+0x89/0xb0 [ 24.970577] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.975048] sock_sendmsg+0xca/0x110 [ 24.978736] SYSC_sendto+0x361/0x5c0 [ 24.982422] ? SYSC_connect+0x4a0/0x4a0 [ 24.986376] ? __do_page_fault+0x5f7/0xc90 [ 24.990585] ? lock_downgrade+0x980/0x980 [ 24.994712] ? handle_mm_fault+0x43b/0x970 [ 24.998928] ? up_read+0x1a/0x40 [ 25.002272] ? __do_page_fault+0x3d6/0xc90 [ 25.006491] ? mm_fault_error+0x2c0/0x2c0 [ 25.010612] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.016125] SyS_sendto+0x40/0x50 [ 25.019552] ? SyS_getpeername+0x30/0x30 [ 25.023587] do_syscall_64+0x282/0x940 [ 25.027445] ? __do_page_fault+0xc90/0xc90 [ 25.031651] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.036378] ? syscall_return_slowpath+0x550/0x550 [ 25.041281] ? syscall_return_slowpath+0x2ac/0x550 [ 25.046180] ? prepare_exit_to_usermode+0x350/0x350 [ 25.051167] ? retint_user+0x18/0x18 [ 25.054857] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.059679] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.064840] RIP: 0033:0x43fd99 [ 25.068006] RSP: 002b:00007ffdfcbc5b78 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.075693] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.082940] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 25.090179] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 25.097419] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.104659] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.112009] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.119482] in_atomic(): 1, irqs_disabled(): 0, pid: 4159, name: syzkaller045487 [ 25.127048] 1 lock held by syzkaller045487/4159: [ 25.131803] #0: (rcu_read_lock){....}, at: [<000000002d9b1b92>] __rds_conn_create+0xe46/0x1b50 [ 25.140753] CPU: 1 PID: 4159 Comm: syzkaller045487 Not tainted 4.15.0+ #307 [ 25.147831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.157156] Call Trace: [ 25.159716] dump_stack+0x194/0x257 [ 25.163317] ? arch_local_irq_restore+0x53/0x53 [ 25.167959] ? print_lock+0x9f/0xa2 [ 25.171562] ? lockdep_print_held_locks+0xc4/0x130 [ 25.176470] ___might_sleep+0x2b2/0x470 [ 25.180418] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.186272] ? __debug_object_init+0x235/0x1040 [ 25.190913] ? debug_mutex_init+0x1c/0x60 [ 25.195041] __might_sleep+0x95/0x190 [ 25.198825] kmem_cache_alloc_trace+0x299/0x740 [ 25.203466] ? lock_acquire+0x1d5/0x580 [ 25.207410] ? lock_acquire+0x1d5/0x580 [ 25.211354] ? __rds_conn_create+0xe46/0x1b50 [ 25.215826] rds_loop_conn_alloc+0xc8/0x380 [ 25.220121] ? rds_loop_conn_free+0x290/0x290 [ 25.224592] ? __init_waitqueue_head+0x97/0x140 [ 25.229235] ? rcutorture_record_progress+0x10/0x10 [ 25.234228] ? __lockdep_init_map+0xe4/0x650 [ 25.238614] __rds_conn_create+0x112f/0x1b50 [ 25.243020] ? rds_conn_drop+0xb0/0xb0 [ 25.246890] ? __raw_spin_lock_init+0x1c/0x100 [ 25.251451] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.256443] ? __lockdep_init_map+0xe4/0x650 [ 25.260823] ? lockdep_init_map+0x9/0x10 [ 25.264855] ? __init_waitqueue_head+0x97/0x140 [ 25.269495] ? init_wait_entry+0x1b0/0x1b0 [ 25.273706] ? lockdep_init_map+0x9/0x10 [ 25.277742] ? rds_message_alloc+0x28c/0x330 [ 25.282121] ? rds_message_next_extension+0x210/0x210 [ 25.287279] ? trace_hardirqs_on+0xd/0x10 [ 25.291401] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.295787] ? __release_sock+0x360/0x360 [ 25.299910] ? lock_sock_nested+0x91/0x110 [ 25.304123] rds_conn_create_outgoing+0x3f/0x50 [ 25.308765] rds_sendmsg+0xda3/0x2390 [ 25.312535] ? avc_has_perm+0x43e/0x680 [ 25.316494] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.320960] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.325427] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.330417] ? find_held_lock+0x35/0x1d0 [ 25.334458] ? sock_has_perm+0x2a4/0x420 [ 25.338491] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.343823] ? lock_release+0xa02/0xa40 [ 25.347768] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.353625] ? __check_object_size+0x8b/0x530 [ 25.358092] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.362564] ? __might_sleep+0x95/0x190 [ 25.366514] ? selinux_socket_sendmsg+0x36/0x40 [ 25.371155] ? security_socket_sendmsg+0x89/0xb0 [ 25.375882] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.380352] sock_sendmsg+0xca/0x110 [ 25.384212] SYSC_sendto+0x361/0x5c0 [ 25.387905] ? SYSC_connect+0x4a0/0x4a0 [ 25.391859] ? __do_page_fault+0x5f7/0xc90 [ 25.396066] ? lock_downgrade+0x980/0x980 [ 25.400190] ? handle_mm_fault+0x43b/0x970 [ 25.404417] ? up_read+0x1a/0x40 [ 25.407756] ? __do_page_fault+0x3d6/0xc90 [ 25.411971] ? mm_fault_error+0x2c0/0x2c0 [ 25.416093] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.421606] SyS_sendto+0x40/0x50 [ 25.425036] ? SyS_getpeername+0x30/0x30 [ 25.429074] do_syscall_64+0x282/0x940 [ 25.432932] ? __do_page_fault+0xc90/0xc90 [ 25.437137] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.441865] ? syscall_return_slowpath+0x550/0x550 [ 25.446766] ? syscall_return_slowpath+0x2ac/0x550 [ 25.451667] ? prepare_exit_to_usermode+0x350/0x350 [ 25.456656] ? retint_user+0x18/0x18 [ 25.460344] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.465164] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.470324] RIP: 0033:0x43fd99 [ 25.473483] RSP: 002b:00007ffdfcbc5b78 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.481163] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.488404] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 25.495649] RBP: 00000000006ca018 R08: 0000000020af3ff0 R09: 0000000000000010 [ 25.502898] R10: 00000000