[....] Starting enhanced syslogd: rsyslogd[ 15.710990] audit: type=1400 audit(1518302335.953:5): avc: denied { syslog } for pid=4009 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: [ 18.969977] audit: type=1400 audit(1518302339.212:6): avc: denied { map } for pid=4148 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 '10.128.15.203' (ECDSA) to the list of known hosts. executing program [ 25.248172] audit: type=1400 audit(1518302345.490:7): avc: denied { map } for pid=4161 comm="syzkaller375587" path="/root/syzkaller375587358" 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 [ 25.276358] [ 25.278122] ============================= [ 25.282344] WARNING: suspicious RCU usage [ 25.286545] 4.15.0+ #307 Not tainted [ 25.290277] ----------------------------- [ 25.294486] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.303775] [ 25.303775] other info that might help us debug this: [ 25.303775] [ 25.311944] [ 25.311944] rcu_scheduler_active = 2, debug_locks = 1 [ 25.318635] 1 lock held by syzkaller375587/4161: [ 25.323401] #0: (rcu_read_lock){....}, at: [<00000000e85aa2fc>] __rds_conn_create+0xe46/0x1b50 [ 25.332369] [ 25.332369] stack backtrace: [ 25.336888] CPU: 1 PID: 4161 Comm: syzkaller375587 Not tainted 4.15.0+ #307 [ 25.343970] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.353302] Call Trace: [ 25.355876] dump_stack+0x194/0x257 [ 25.359486] ? arch_local_irq_restore+0x53/0x53 [ 25.364148] lockdep_rcu_suspicious+0x123/0x170 [ 25.368802] ___might_sleep+0x385/0x470 [ 25.372758] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.378631] ? __debug_object_init+0x235/0x1040 [ 25.383290] ? debug_mutex_init+0x1c/0x60 [ 25.387423] __might_sleep+0x95/0x190 [ 25.391209] kmem_cache_alloc_trace+0x299/0x740 [ 25.395860] ? lock_acquire+0x1d5/0x580 [ 25.399811] ? lock_acquire+0x1d5/0x580 [ 25.403773] ? __rds_conn_create+0xe46/0x1b50 [ 25.408250] rds_loop_conn_alloc+0xc8/0x380 [ 25.412551] ? rds_loop_conn_free+0x290/0x290 [ 25.417037] ? __init_waitqueue_head+0x97/0x140 [ 25.421698] ? rcutorture_record_progress+0x10/0x10 [ 25.426696] ? __lockdep_init_map+0xe4/0x650 [ 25.431092] __rds_conn_create+0x112f/0x1b50 [ 25.435506] ? rds_conn_drop+0xb0/0xb0 [ 25.439382] ? __raw_spin_lock_init+0x1c/0x100 [ 25.443944] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.448955] ? __lockdep_init_map+0xe4/0x650 [ 25.453345] ? lockdep_init_map+0x9/0x10 [ 25.457388] ? __init_waitqueue_head+0x97/0x140 [ 25.462038] ? init_wait_entry+0x1b0/0x1b0 [ 25.466256] ? lockdep_init_map+0x9/0x10 [ 25.470303] ? rds_message_alloc+0x28c/0x330 [ 25.474692] ? rds_message_next_extension+0x210/0x210 [ 25.479865] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.484256] ? __release_sock+0x360/0x360 [ 25.488382] ? lock_sock_nested+0x91/0x110 [ 25.492606] rds_conn_create_outgoing+0x3f/0x50 [ 25.497260] rds_sendmsg+0xda3/0x2390 [ 25.501048] ? avc_has_perm+0x43e/0x680 [ 25.505033] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.509511] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.513988] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.518987] ? find_held_lock+0x35/0x1d0 [ 25.523051] ? sock_has_perm+0x2a4/0x420 [ 25.527100] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.532445] ? lock_release+0xa02/0xa40 [ 25.536401] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.542277] ? __check_object_size+0x8b/0x530 [ 25.546754] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.551249] ? __might_sleep+0x95/0x190 [ 25.555209] ? selinux_socket_sendmsg+0x36/0x40 [ 25.559859] ? security_socket_sendmsg+0x89/0xb0 [ 25.564609] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.569087] sock_sendmsg+0xca/0x110 [ 25.572780] SYSC_sendto+0x361/0x5c0 [ 25.576483] ? SYSC_connect+0x4a0/0x4a0 [ 25.580444] ? __do_page_fault+0x5f7/0xc90 [ 25.584662] ? lock_downgrade+0x980/0x980 [ 25.588796] ? handle_mm_fault+0x43b/0x970 [ 25.593040] ? up_read+0x1a/0x40 [ 25.596385] ? __do_page_fault+0x3d6/0xc90 [ 25.600604] ? mm_fault_error+0x2c0/0x2c0 [ 25.604744] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.610272] SyS_sendto+0x40/0x50 [ 25.613710] ? SyS_getpeername+0x30/0x30 [ 25.617757] do_syscall_64+0x282/0x940 [ 25.621630] ? __do_page_fault+0xc90/0xc90 [ 25.625875] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.630628] ? syscall_return_slowpath+0x550/0x550 [ 25.635574] ? syscall_return_slowpath+0x2ac/0x550 [ 25.640522] ? prepare_exit_to_usermode+0x350/0x350 [ 25.646242] ? retint_user+0x18/0x18 [ 25.649963] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.654790] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.659959] RIP: 0033:0x43fd99 [ 25.663137] RSP: 002b:00007ffdeeba6e38 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.670821] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.678070] RDX: 0000000000000000 RSI: 000000002056a000 RDI: 0000000000000003 [ 25.685333] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 25.692581] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.699838] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.707170] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.714650] in_atomic(): 1, irqs_disabled(): 0, pid: 4161, name: syzkaller375587 [ 25.722208] 1 lock held by syzkaller375587/4161: [ 25.726996] #0: (rcu_read_lock){....}, at: [<00000000e85aa2fc>] __rds_conn_create+0xe46/0x1b50 [ 25.736039] CPU: 1 PID: 4161 Comm: syzkaller375587 Not tainted 4.15.0+ #307 [ 25.743122] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.752453] Call Trace: [ 25.755030] dump_stack+0x194/0x257 [ 25.758642] ? arch_local_irq_restore+0x53/0x53 [ 25.763301] ? print_lock+0x9f/0xa2 [ 25.766909] ? lockdep_print_held_locks+0xc4/0x130 [ 25.771825] ___might_sleep+0x2b2/0x470 [ 25.775786] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.781653] ? __debug_object_init+0x235/0x1040 [ 25.786304] ? debug_mutex_init+0x1c/0x60 [ 25.790434] __might_sleep+0x95/0x190 [ 25.794224] kmem_cache_alloc_trace+0x299/0x740 [ 25.798871] ? lock_acquire+0x1d5/0x580 [ 25.802825] ? lock_acquire+0x1d5/0x580 [ 25.806778] ? __rds_conn_create+0xe46/0x1b50 [ 25.811255] rds_loop_conn_alloc+0xc8/0x380 [ 25.815557] ? rds_loop_conn_free+0x290/0x290 [ 25.820050] ? __init_waitqueue_head+0x97/0x140 [ 25.824701] ? rcutorture_record_progress+0x10/0x10 [ 25.829712] ? __lockdep_init_map+0xe4/0x650 [ 25.834115] __rds_conn_create+0x112f/0x1b50 [ 25.838537] ? rds_conn_drop+0xb0/0xb0 [ 25.842415] ? __raw_spin_lock_init+0x1c/0x100 [ 25.846978] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.851979] ? __lockdep_init_map+0xe4/0x650 [ 25.856376] ? lockdep_init_map+0x9/0x10 [ 25.860417] ? __init_waitqueue_head+0x97/0x140 [ 25.865076] ? init_wait_entry+0x1b0/0x1b0 [ 25.869300] ? lockdep_init_map+0x9/0x10 [ 25.873356] ? rds_message_alloc+0x28c/0x330 [ 25.877754] ? rds_message_next_extension+0x210/0x210 [ 25.882930] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.887321] ? __release_sock+0x360/0x360 [ 25.891445] ? lock_sock_nested+0x91/0x110 [ 25.895665] rds_conn_create_outgoing+0x3f/0x50 [ 25.900320] rds_sendmsg+0xda3/0x2390 [ 25.904121] ? avc_has_perm+0x43e/0x680 [ 25.908102] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.912583] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.917065] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.922077] ? find_held_lock+0x35/0x1d0 [ 25.926137] ? sock_has_perm+0x2a4/0x420 [ 25.930194] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.935540] ? lock_release+0xa02/0xa40 [ 25.939503] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.945374] ? __check_object_size+0x8b/0x530 [ 25.949864] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.954349] ? __might_sleep+0x95/0x190 [ 25.958315] ? selinux_socket_sendmsg+0x36/0x40 [ 25.962974] ? security_socket_sendmsg+0x89/0xb0 [ 25.967712] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.972191] sock_sendmsg+0xca/0x110 [ 25.975901] SYSC_sendto+0x361/0x5c0 [ 25.979597] ? SYSC_connect+0x4a0/0x4a0 [ 25.983556] ? __do_page_fault+0x5f7/0xc90 [ 25.987776] ? lock_downgrade+0x980/0x980 [ 25.991911] ? handle_mm_fault+0x43b/0x970 [ 25.996145] ? up_read+0x1a/0x40 [ 25.999491] ? __do_page_fault+0x3d6/0xc90 [ 26.003722] ? mm_fault_error+0x2c0/0x2c0 [ 26.007851] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.013372] SyS_sendto+0x40/0x50 [ 26.016805] ? SyS_getpeername+0x30/0x30 [ 26.020845] do_syscall_64+0x282/0x940 [ 26.024723] ? __do_page_fault+0xc90/0xc90 [ 26.028938] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.033676] ? syscall_return_slowpath+0x550/0x550 [ 26.038586] ? syscall_return_slowpath+0x2ac/0x550 [ 26.043494] ? prepare_exit_to_usermode+0x350/0x350 [ 26.048502] ? retint_user+0x18/0x18 [ 26.052203] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.057043] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.062221] RIP: 0033:0x43fd99 [ 26.065390] RSP: 002b:00007ffdeeba6e38 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.073085] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.080334] RDX: 0000000000000000 RSI: 000000002056a000 RDI: 0000000000000003 [ 26.087582] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 26.094829] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0