[....] Starting enhanced syslogd: rsyslogd[ 15.794432] audit: type=1400 audit(1518371156.078:5): 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 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: [ 17.797363] audit: type=1400 audit(1518371158.081:6): 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 '10.128.0.32' (ECDSA) to the list of known hosts. executing program [ 24.092702] audit: type=1400 audit(1518371164.376:7): avc: denied { map } for pid=4159 comm="syzkaller419345" path="/root/syzkaller419345548" 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 [ 24.119589] [ 24.121312] ============================= [ 24.125467] WARNING: suspicious RCU usage [ 24.129642] 4.15.0+ #222 Not tainted [ 24.133354] ----------------------------- [ 24.137512] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 24.146802] [ 24.146802] other info that might help us debug this: [ 24.146802] [ 24.154963] [ 24.154963] rcu_scheduler_active = 2, debug_locks = 1 [ 24.161635] 1 lock held by syzkaller419345/4159: [ 24.166400] #0: (rcu_read_lock){....}, at: [<00000000844694f8>] __rds_conn_create+0xe46/0x1b50 [ 24.175351] [ 24.175351] stack backtrace: [ 24.179860] CPU: 1 PID: 4159 Comm: syzkaller419345 Not tainted 4.15.0+ #222 [ 24.186944] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.196272] Call Trace: [ 24.198843] dump_stack+0x194/0x257 [ 24.202447] ? arch_local_irq_restore+0x53/0x53 [ 24.207104] lockdep_rcu_suspicious+0x123/0x170 [ 24.211762] ___might_sleep+0x385/0x470 [ 24.215721] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.221581] ? __debug_object_init+0x235/0x1040 [ 24.226230] ? debug_mutex_init+0x1c/0x60 [ 24.230362] __might_sleep+0x95/0x190 [ 24.234143] kmem_cache_alloc_trace+0x299/0x740 [ 24.238794] ? lock_acquire+0x1d5/0x580 [ 24.242744] ? lock_acquire+0x1d5/0x580 [ 24.246703] ? __rds_conn_create+0xe46/0x1b50 [ 24.251184] rds_loop_conn_alloc+0xc8/0x380 [ 24.255478] ? rds_loop_conn_free+0x290/0x290 [ 24.259948] ? __init_waitqueue_head+0x97/0x140 [ 24.264597] ? rcutorture_record_progress+0x10/0x10 [ 24.269588] ? __lockdep_init_map+0xe4/0x650 [ 24.273985] __rds_conn_create+0x112f/0x1b50 [ 24.278391] ? rds_conn_drop+0xb0/0xb0 [ 24.282277] ? __raw_spin_lock_init+0x1c/0x100 [ 24.286838] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.291841] ? __lockdep_init_map+0xe4/0x650 [ 24.296243] ? lockdep_init_map+0x9/0x10 [ 24.300276] ? __init_waitqueue_head+0x97/0x140 [ 24.304917] ? init_wait_entry+0x1b0/0x1b0 [ 24.309129] ? lockdep_init_map+0x9/0x10 [ 24.313168] ? rds_message_alloc+0x28c/0x330 [ 24.317549] ? rds_message_next_extension+0x210/0x210 [ 24.322725] ? trace_hardirqs_on+0xd/0x10 [ 24.326859] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.331244] ? __release_sock+0x360/0x360 [ 24.335367] ? lock_sock_nested+0x91/0x110 [ 24.339585] rds_conn_create_outgoing+0x3f/0x50 [ 24.344230] rds_sendmsg+0xda3/0x2390 [ 24.348008] ? avc_has_perm+0x43e/0x680 [ 24.351995] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.356472] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.360946] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.365950] ? find_held_lock+0x35/0x1d0 [ 24.369997] ? sock_has_perm+0x2a4/0x420 [ 24.374050] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.379391] ? lock_release+0xa02/0xa40 [ 24.383340] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.389207] ? __check_object_size+0x8b/0x530 [ 24.393684] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.398184] ? __might_sleep+0x95/0x190 [ 24.402145] ? selinux_socket_sendmsg+0x36/0x40 [ 24.406787] ? security_socket_sendmsg+0x89/0xb0 [ 24.411522] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.415997] sock_sendmsg+0xca/0x110 [ 24.419693] SYSC_sendto+0x361/0x5c0 [ 24.423384] ? SYSC_connect+0x4a0/0x4a0 [ 24.427339] ? __do_page_fault+0x5f7/0xc90 [ 24.431550] ? lock_downgrade+0x980/0x980 [ 24.435681] ? handle_mm_fault+0x43b/0x970 [ 24.439919] ? up_read+0x1a/0x40 [ 24.443273] ? __do_page_fault+0x3d6/0xc90 [ 24.447493] ? mm_fault_error+0x2c0/0x2c0 [ 24.451627] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.457151] SyS_sendto+0x40/0x50 [ 24.460583] ? SyS_getpeername+0x30/0x30 [ 24.464622] do_syscall_64+0x282/0x940 [ 24.468481] ? __do_page_fault+0xc90/0xc90 [ 24.472687] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.478199] ? syscall_return_slowpath+0x550/0x550 [ 24.483111] ? syscall_return_slowpath+0x2ac/0x550 [ 24.488035] ? retint_user+0x18/0x18 [ 24.491731] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.496557] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.501717] RIP: 0033:0x43fd99 [ 24.504883] RSP: 002b:00007ffc7f0b0cb8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.512565] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.519815] RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 24.527066] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 24.534309] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 24.541559] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 24.548873] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.556325] in_atomic(): 1, irqs_disabled(): 0, pid: 4159, name: syzkaller419345 [ 24.563861] 1 lock held by syzkaller419345/4159: [ 24.568633] #0: (rcu_read_lock){....}, at: [<00000000844694f8>] __rds_conn_create+0xe46/0x1b50 [ 24.577584] CPU: 1 PID: 4159 Comm: syzkaller419345 Not tainted 4.15.0+ #222 [ 24.584656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.593981] Call Trace: [ 24.596544] dump_stack+0x194/0x257 [ 24.600153] ? arch_local_irq_restore+0x53/0x53 [ 24.604796] ? print_lock+0x9f/0xa2 [ 24.608398] ? lockdep_print_held_locks+0xc4/0x130 [ 24.613308] ___might_sleep+0x2b2/0x470 [ 24.617261] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.623119] ? __debug_object_init+0x235/0x1040 [ 24.627765] ? debug_mutex_init+0x1c/0x60 [ 24.631893] __might_sleep+0x95/0x190 [ 24.635676] kmem_cache_alloc_trace+0x299/0x740 [ 24.640324] ? lock_acquire+0x1d5/0x580 [ 24.644274] ? lock_acquire+0x1d5/0x580 [ 24.648230] ? __rds_conn_create+0xe46/0x1b50 [ 24.652711] rds_loop_conn_alloc+0xc8/0x380 [ 24.657014] ? rds_loop_conn_free+0x290/0x290 [ 24.661505] ? __init_waitqueue_head+0x97/0x140 [ 24.666151] ? rcutorture_record_progress+0x10/0x10 [ 24.671144] ? __lockdep_init_map+0xe4/0x650 [ 24.675529] __rds_conn_create+0x112f/0x1b50 [ 24.679926] ? rds_conn_drop+0xb0/0xb0 [ 24.683799] ? __raw_spin_lock_init+0x1c/0x100 [ 24.688360] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.693366] ? __lockdep_init_map+0xe4/0x650 [ 24.697755] ? lockdep_init_map+0x9/0x10 [ 24.701795] ? __init_waitqueue_head+0x97/0x140 [ 24.706449] ? init_wait_entry+0x1b0/0x1b0 [ 24.710681] ? lockdep_init_map+0x9/0x10 [ 24.714729] ? rds_message_alloc+0x28c/0x330 [ 24.719110] ? rds_message_next_extension+0x210/0x210 [ 24.724283] ? trace_hardirqs_on+0xd/0x10 [ 24.728406] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.732796] ? __release_sock+0x360/0x360 [ 24.736915] ? lock_sock_nested+0x91/0x110 [ 24.741129] rds_conn_create_outgoing+0x3f/0x50 [ 24.745780] rds_sendmsg+0xda3/0x2390 [ 24.749553] ? avc_has_perm+0x43e/0x680 [ 24.753533] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.758014] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.762496] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.767497] ? find_held_lock+0x35/0x1d0 [ 24.771541] ? sock_has_perm+0x2a4/0x420 [ 24.775576] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.780916] ? lock_release+0xa02/0xa40 [ 24.784867] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.790737] ? __check_object_size+0x8b/0x530 [ 24.795213] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.799691] ? __might_sleep+0x95/0x190 [ 24.803645] ? selinux_socket_sendmsg+0x36/0x40 [ 24.808287] ? security_socket_sendmsg+0x89/0xb0 [ 24.813026] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.817507] sock_sendmsg+0xca/0x110 [ 24.821202] SYSC_sendto+0x361/0x5c0 [ 24.824894] ? SYSC_connect+0x4a0/0x4a0 [ 24.828846] ? __do_page_fault+0x5f7/0xc90 [ 24.833064] ? lock_downgrade+0x980/0x980 [ 24.837206] ? handle_mm_fault+0x43b/0x970 [ 24.841427] ? up_read+0x1a/0x40 [ 24.844782] ? __do_page_fault+0x3d6/0xc90 [ 24.849001] ? mm_fault_error+0x2c0/0x2c0 [ 24.853137] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.858658] SyS_sendto+0x40/0x50 [ 24.862091] ? SyS_getpeername+0x30/0x30 [ 24.866130] do_syscall_64+0x282/0x940 [ 24.869994] ? __do_page_fault+0xc90/0xc90 [ 24.874209] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.879719] ? syscall_return_slowpath+0x550/0x550 [ 24.884621] ? syscall_return_slowpath+0x2ac/0x550 [ 24.889533] ? retint_user+0x18/0x18 [ 24.893238] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.898072] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.903238] RIP: 0033:0x43fd99 [ 24.906404] RSP: 002b:00007ffc7f0b0cb8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 24.914088] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 24.921344] RDX: 0000000000000000 RSI: 0000000020dbf000 RDI: 0000000000000003 [ 24.928595] RBP: 00000000006ca018 R08: 0000000020b2d000 R09: 0000000000000010 [ 24.935843] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 24.943089] R13: 0000000000401750