[....] Starting enhanced syslogd: rsyslogd[ 14.985826] audit: type=1400 audit(1518416784.529:5): avc: denied { syslog } for pid=3915 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: [ 18.890566] audit: type=1400 audit(1518416788.434:6): avc: denied { map } for pid=4056 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 '10.128.15.215' (ECDSA) to the list of known hosts. executing program [ 25.157088] audit: type=1400 audit(1518416794.700:7): avc: denied { map } for pid=4069 comm="syzkaller859531" path="/root/syzkaller859531616" 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 [ 25.183773] [ 25.185545] ============================= [ 25.189699] WARNING: suspicious RCU usage [ 25.193856] 4.15.0+ #222 Not tainted [ 25.197576] ----------------------------- [ 25.201748] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.211034] [ 25.211034] other info that might help us debug this: [ 25.211034] [ 25.219189] [ 25.219189] rcu_scheduler_active = 2, debug_locks = 1 [ 25.225862] 1 lock held by syzkaller859531/4069: [ 25.230618] #0: (rcu_read_lock){....}, at: [<00000000c517e532>] __rds_conn_create+0xe46/0x1b50 [ 25.239566] [ 25.239566] stack backtrace: [ 25.244070] CPU: 0 PID: 4069 Comm: syzkaller859531 Not tainted 4.15.0+ #222 [ 25.251153] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.260489] Call Trace: [ 25.263057] dump_stack+0x194/0x257 [ 25.266659] ? arch_local_irq_restore+0x53/0x53 [ 25.271313] lockdep_rcu_suspicious+0x123/0x170 [ 25.275956] ___might_sleep+0x385/0x470 [ 25.279901] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.285763] ? __debug_object_init+0x235/0x1040 [ 25.290404] ? debug_mutex_init+0x1c/0x60 [ 25.294528] __might_sleep+0x95/0x190 [ 25.298305] kmem_cache_alloc_trace+0x299/0x740 [ 25.302946] ? lock_acquire+0x1d5/0x580 [ 25.306892] ? lock_acquire+0x1d5/0x580 [ 25.310842] ? __rds_conn_create+0xe46/0x1b50 [ 25.315315] rds_loop_conn_alloc+0xc8/0x380 [ 25.319608] ? rds_loop_conn_free+0x290/0x290 [ 25.324076] ? __init_waitqueue_head+0x97/0x140 [ 25.328725] ? rcutorture_record_progress+0x10/0x10 [ 25.333716] ? __lockdep_init_map+0xe4/0x650 [ 25.338100] __rds_conn_create+0x112f/0x1b50 [ 25.342498] ? rds_conn_drop+0xb0/0xb0 [ 25.346366] ? __raw_spin_lock_init+0x1c/0x100 [ 25.350922] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.355914] ? __lockdep_init_map+0xe4/0x650 [ 25.360301] ? lockdep_init_map+0x9/0x10 [ 25.364333] ? __init_waitqueue_head+0x97/0x140 [ 25.368982] ? init_wait_entry+0x1b0/0x1b0 [ 25.373192] ? lockdep_init_map+0x9/0x10 [ 25.377243] ? rds_message_alloc+0x28c/0x330 [ 25.381624] ? rds_message_next_extension+0x210/0x210 [ 25.386785] ? trace_hardirqs_on+0xd/0x10 [ 25.390911] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.395296] ? __release_sock+0x360/0x360 [ 25.399413] ? lock_sock_nested+0x91/0x110 [ 25.403623] rds_conn_create_outgoing+0x3f/0x50 [ 25.408268] rds_sendmsg+0xda3/0x2390 [ 25.412039] ? avc_has_perm+0x43e/0x680 [ 25.415999] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.420472] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.424949] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.429943] ? find_held_lock+0x35/0x1d0 [ 25.433983] ? sock_has_perm+0x2a4/0x420 [ 25.438027] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.443362] ? lock_release+0xa02/0xa40 [ 25.447307] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.453164] ? __check_object_size+0x8b/0x530 [ 25.457629] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.462101] ? __might_sleep+0x95/0x190 [ 25.466051] ? selinux_socket_sendmsg+0x36/0x40 [ 25.470689] ? security_socket_sendmsg+0x89/0xb0 [ 25.475416] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.479891] sock_sendmsg+0xca/0x110 [ 25.483581] SYSC_sendto+0x361/0x5c0 [ 25.487272] ? SYSC_connect+0x4a0/0x4a0 [ 25.491223] ? __do_page_fault+0x5f7/0xc90 [ 25.495429] ? lock_downgrade+0x980/0x980 [ 25.499558] ? handle_mm_fault+0x43b/0x970 [ 25.503777] ? up_read+0x1a/0x40 [ 25.507119] ? __do_page_fault+0x3d6/0xc90 [ 25.511330] ? mm_fault_error+0x2c0/0x2c0 [ 25.515454] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.520965] SyS_sendto+0x40/0x50 [ 25.524388] ? SyS_getpeername+0x30/0x30 [ 25.528424] do_syscall_64+0x282/0x940 [ 25.532285] ? __do_page_fault+0xc90/0xc90 [ 25.536492] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.541222] ? syscall_return_slowpath+0x550/0x550 [ 25.546123] ? syscall_return_slowpath+0x2ac/0x550 [ 25.551031] ? prepare_exit_to_usermode+0x350/0x350 [ 25.556028] ? retint_user+0x18/0x18 [ 25.559718] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.564538] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.569697] RIP: 0033:0x43fd99 [ 25.572856] RSP: 002b:00007ffd4055f018 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.580533] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.587774] RDX: 0000000000000000 RSI: 0000000020ea8000 RDI: 0000000000000003 [ 25.595027] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 25.602274] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.609513] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.616822] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.624272] in_atomic(): 1, irqs_disabled(): 0, pid: 4069, name: syzkaller859531 [ 25.631810] 1 lock held by syzkaller859531/4069: [ 25.636562] #0: (rcu_read_lock){....}, at: [<00000000c517e532>] __rds_conn_create+0xe46/0x1b50 [ 25.645509] CPU: 0 PID: 4069 Comm: syzkaller859531 Not tainted 4.15.0+ #222 [ 25.652588] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.661910] Call Trace: [ 25.664472] dump_stack+0x194/0x257 [ 25.668074] ? arch_local_irq_restore+0x53/0x53 [ 25.672716] ? print_lock+0x9f/0xa2 [ 25.676418] ? lockdep_print_held_locks+0xc4/0x130 [ 25.681332] ___might_sleep+0x2b2/0x470 [ 25.685279] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.691133] ? __debug_object_init+0x235/0x1040 [ 25.695775] ? debug_mutex_init+0x1c/0x60 [ 25.699904] __might_sleep+0x95/0x190 [ 25.703680] kmem_cache_alloc_trace+0x299/0x740 [ 25.708321] ? lock_acquire+0x1d5/0x580 [ 25.712268] ? lock_acquire+0x1d5/0x580 [ 25.716214] ? __rds_conn_create+0xe46/0x1b50 [ 25.720683] rds_loop_conn_alloc+0xc8/0x380 [ 25.724978] ? rds_loop_conn_free+0x290/0x290 [ 25.729447] ? __init_waitqueue_head+0x97/0x140 [ 25.734091] ? rcutorture_record_progress+0x10/0x10 [ 25.739082] ? __lockdep_init_map+0xe4/0x650 [ 25.743467] __rds_conn_create+0x112f/0x1b50 [ 25.747864] ? rds_conn_drop+0xb0/0xb0 [ 25.751730] ? __raw_spin_lock_init+0x1c/0x100 [ 25.756283] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.761275] ? __lockdep_init_map+0xe4/0x650 [ 25.765659] ? lockdep_init_map+0x9/0x10 [ 25.769690] ? __init_waitqueue_head+0x97/0x140 [ 25.774330] ? init_wait_entry+0x1b0/0x1b0 [ 25.778543] ? lockdep_init_map+0x9/0x10 [ 25.782587] ? rds_message_alloc+0x28c/0x330 [ 25.786971] ? rds_message_next_extension+0x210/0x210 [ 25.792130] ? trace_hardirqs_on+0xd/0x10 [ 25.796253] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.800649] ? __release_sock+0x360/0x360 [ 25.804778] ? lock_sock_nested+0x91/0x110 [ 25.808996] rds_conn_create_outgoing+0x3f/0x50 [ 25.813645] rds_sendmsg+0xda3/0x2390 [ 25.817423] ? avc_has_perm+0x43e/0x680 [ 25.821381] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.825856] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.830329] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.835319] ? find_held_lock+0x35/0x1d0 [ 25.839358] ? sock_has_perm+0x2a4/0x420 [ 25.843398] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.848733] ? lock_release+0xa02/0xa40 [ 25.852684] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.858551] ? __check_object_size+0x8b/0x530 [ 25.863024] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.867499] ? __might_sleep+0x95/0x190 [ 25.871451] ? selinux_socket_sendmsg+0x36/0x40 [ 25.876098] ? security_socket_sendmsg+0x89/0xb0 [ 25.880833] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.885302] sock_sendmsg+0xca/0x110 [ 25.888989] SYSC_sendto+0x361/0x5c0 [ 25.892681] ? SYSC_connect+0x4a0/0x4a0 [ 25.896638] ? __do_page_fault+0x5f7/0xc90 [ 25.900845] ? lock_downgrade+0x980/0x980 [ 25.904972] ? handle_mm_fault+0x43b/0x970 [ 25.909191] ? up_read+0x1a/0x40 [ 25.912531] ? __do_page_fault+0x3d6/0xc90 [ 25.916834] ? mm_fault_error+0x2c0/0x2c0 [ 25.920957] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.926470] SyS_sendto+0x40/0x50 [ 25.929894] ? SyS_getpeername+0x30/0x30 [ 25.933931] do_syscall_64+0x282/0x940 [ 25.937788] ? __do_page_fault+0xc90/0xc90 [ 25.941997] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.946733] ? syscall_return_slowpath+0x550/0x550 [ 25.951634] ? syscall_return_slowpath+0x2ac/0x550 [ 25.956538] ? prepare_exit_to_usermode+0x350/0x350 [ 25.961527] ? retint_user+0x18/0x18 [ 25.965218] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.970043] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.975201] RIP: 0033:0x43fd99 [ 25.978363] RSP: 002b:00007ffd4055f018 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.986044] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.993287] RDX: 0000000000000000 RSI: 0000000020ea8000 RDI: 0000000000000003 [ 26.000530] RBP: 00000000006ca018 R08: 0000000020dfcff0 R09: 0000000000000010 [ 26.007772] R10: 0000000000000000