[....] Starting enhanced syslogd: rsyslogd[ 15.665938] audit: type=1400 audit(1518314526.844:5): avc: denied { syslog } for pid=3959 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: [ 18.733963] audit: type=1400 audit(1518314529.912:6): avc: denied { map } for pid=4097 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 '10.128.15.229' (ECDSA) to the list of known hosts. executing program [ 25.027894] audit: type=1400 audit(1518314536.206:7): avc: denied { map } for pid=4111 comm="syzkaller329590" path="/root/syzkaller329590893" 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 [ 25.055981] [ 25.057683] ============================= [ 25.061835] WARNING: suspicious RCU usage [ 25.065985] 4.15.0+ #218 Not tainted [ 25.069702] ----------------------------- [ 25.073870] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.083142] [ 25.083142] other info that might help us debug this: [ 25.083142] [ 25.091292] [ 25.091292] rcu_scheduler_active = 2, debug_locks = 1 [ 25.097965] 1 lock held by syzkaller329590/4111: [ 25.102720] #0: (rcu_read_lock){....}, at: [<000000002eccb4b5>] __rds_conn_create+0xe46/0x1b50 [ 25.111666] [ 25.111666] stack backtrace: [ 25.116168] CPU: 0 PID: 4111 Comm: syzkaller329590 Not tainted 4.15.0+ #218 [ 25.123240] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.132572] Call Trace: [ 25.135135] dump_stack+0x194/0x257 [ 25.138738] ? arch_local_irq_restore+0x53/0x53 [ 25.143392] lockdep_rcu_suspicious+0x123/0x170 [ 25.148040] ___might_sleep+0x385/0x470 [ 25.151993] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.157853] ? __debug_object_init+0x235/0x1040 [ 25.162499] ? lock_acquire+0x1d5/0x580 [ 25.166447] ? debug_mutex_init+0x1c/0x60 [ 25.170573] __might_sleep+0x95/0x190 [ 25.174351] kmem_cache_alloc_trace+0x299/0x740 [ 25.178995] ? lock_acquire+0x1d5/0x580 [ 25.182942] ? lock_acquire+0x1d5/0x580 [ 25.186888] ? __rds_conn_create+0xe46/0x1b50 [ 25.191359] rds_loop_conn_alloc+0xc8/0x380 [ 25.195963] ? rds_loop_conn_free+0x290/0x290 [ 25.200434] ? __init_waitqueue_head+0x97/0x140 [ 25.205086] ? rcutorture_record_progress+0x10/0x10 [ 25.210076] ? __lockdep_init_map+0xe4/0x650 [ 25.214464] __rds_conn_create+0x112f/0x1b50 [ 25.218871] ? rds_conn_drop+0xb0/0xb0 [ 25.222749] ? __raw_spin_lock_init+0x1c/0x100 [ 25.227305] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.232299] ? __lockdep_init_map+0xe4/0x650 [ 25.236682] ? lockdep_init_map+0x9/0x10 [ 25.240714] ? __init_waitqueue_head+0x97/0x140 [ 25.245354] ? init_wait_entry+0x1b0/0x1b0 [ 25.249566] ? lockdep_init_map+0x9/0x10 [ 25.253604] ? rds_message_alloc+0x28c/0x330 [ 25.257983] ? rds_message_next_extension+0x210/0x210 [ 25.263143] ? trace_hardirqs_on+0xd/0x10 [ 25.267268] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.271655] ? __release_sock+0x360/0x360 [ 25.275773] ? lock_sock_nested+0x91/0x110 [ 25.279987] rds_conn_create_outgoing+0x3f/0x50 [ 25.284631] rds_sendmsg+0xda3/0x2390 [ 25.288419] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.292887] ? find_held_lock+0x35/0x1d0 [ 25.296931] ? __might_fault+0x110/0x1d0 [ 25.300965] ? lock_downgrade+0x980/0x980 [ 25.305095] ? sock_has_perm+0x2a4/0x420 [ 25.309133] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.314474] ? __might_sleep+0x95/0x190 [ 25.318434] ? kasan_check_write+0x14/0x20 [ 25.322642] ? _copy_from_user+0x99/0x110 [ 25.326768] ? selinux_socket_sendmsg+0x36/0x40 [ 25.331408] ? security_socket_sendmsg+0x89/0xb0 [ 25.336140] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.340616] sock_sendmsg+0xca/0x110 [ 25.344308] ___sys_sendmsg+0x320/0x8b0 [ 25.348260] ? copy_msghdr_from_user+0x590/0x590 [ 25.352991] ? finish_task_switch+0x29b/0x890 [ 25.357484] ? copy_overflow+0x20/0x20 [ 25.361361] ? __fget_light+0x2b2/0x3c0 [ 25.365341] ? __pmd_alloc+0x4e0/0x4e0 [ 25.369200] ? check_noncircular+0x20/0x20 [ 25.373413] ? __fdget+0x18/0x20 [ 25.376757] __sys_sendmmsg+0x31b/0x620 [ 25.380703] ? __sys_sendmmsg+0x31b/0x620 [ 25.384831] ? SyS_sendmsg+0x50/0x50 [ 25.388524] ? __do_page_fault+0x5f7/0xc90 [ 25.392733] ? lock_downgrade+0x980/0x980 [ 25.396865] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.401415] ? vmacache_find+0x5f/0x280 [ 25.405370] ? up_read+0x1a/0x40 [ 25.408708] ? __do_page_fault+0x3d6/0xc90 [ 25.412933] compat_SyS_sendmmsg+0x32/0x40 [ 25.417143] ? compat_SyS_sendmsg+0x40/0x40 [ 25.421436] do_fast_syscall_32+0x3ee/0xfa1 [ 25.425737] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.430291] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.435801] ? syscall_return_slowpath+0x550/0x550 [ 25.440703] ? syscall_return_slowpath+0x2ac/0x550 [ 25.445615] ? retint_user+0x18/0x18 [ 25.449308] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.454129] entry_SYSENTER_compat+0x54/0x63 [ 25.458510] RIP: 0023:0xf7fbec79 [ 25.461845] RSP: 002b:00000000ffb5fa1c EFLAGS: 00000282 ORIG_RAX: 0000000000000159 [ 25.469524] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020573000 [ 25.476767] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000015 [ 25.484008] RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000000 [ 25.491249] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 25.498498] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 25.505799] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.513253] in_atomic(): 1, irqs_disabled(): 0, pid: 4111, name: syzkaller329590 [ 25.520812] 1 lock held by syzkaller329590/4111: [ 25.525567] #0: (rcu_read_lock){....}, at: [<000000002eccb4b5>] __rds_conn_create+0xe46/0x1b50 [ 25.534521] CPU: 0 PID: 4111 Comm: syzkaller329590 Not tainted 4.15.0+ #218 [ 25.541600] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.550925] Call Trace: [ 25.553493] dump_stack+0x194/0x257 [ 25.557094] ? arch_local_irq_restore+0x53/0x53 [ 25.561739] ? print_lock+0x9f/0xa2 [ 25.565338] ? lockdep_print_held_locks+0xc4/0x130 [ 25.570260] ___might_sleep+0x2b2/0x470 [ 25.574214] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.580071] ? __debug_object_init+0x235/0x1040 [ 25.584710] ? lock_acquire+0x1d5/0x580 [ 25.588658] ? debug_mutex_init+0x1c/0x60 [ 25.592784] __might_sleep+0x95/0x190 [ 25.596561] kmem_cache_alloc_trace+0x299/0x740 [ 25.601203] ? lock_acquire+0x1d5/0x580 [ 25.605147] ? lock_acquire+0x1d5/0x580 [ 25.609095] ? __rds_conn_create+0xe46/0x1b50 [ 25.613566] rds_loop_conn_alloc+0xc8/0x380 [ 25.617863] ? rds_loop_conn_free+0x290/0x290 [ 25.622333] ? __init_waitqueue_head+0x97/0x140 [ 25.626977] ? rcutorture_record_progress+0x10/0x10 [ 25.631968] ? __lockdep_init_map+0xe4/0x650 [ 25.636355] __rds_conn_create+0x112f/0x1b50 [ 25.640755] ? rds_conn_drop+0xb0/0xb0 [ 25.644623] ? __raw_spin_lock_init+0x1c/0x100 [ 25.649179] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.654175] ? __lockdep_init_map+0xe4/0x650 [ 25.658557] ? lockdep_init_map+0x9/0x10 [ 25.662590] ? __init_waitqueue_head+0x97/0x140 [ 25.667231] ? init_wait_entry+0x1b0/0x1b0 [ 25.671454] ? lockdep_init_map+0x9/0x10 [ 25.675494] ? rds_message_alloc+0x28c/0x330 [ 25.679877] ? rds_message_next_extension+0x210/0x210 [ 25.685036] ? trace_hardirqs_on+0xd/0x10 [ 25.689167] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.693558] ? __release_sock+0x360/0x360 [ 25.697677] ? lock_sock_nested+0x91/0x110 [ 25.701890] rds_conn_create_outgoing+0x3f/0x50 [ 25.706538] rds_sendmsg+0xda3/0x2390 [ 25.710327] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.714794] ? find_held_lock+0x35/0x1d0 [ 25.718836] ? __might_fault+0x110/0x1d0 [ 25.722872] ? lock_downgrade+0x980/0x980 [ 25.726997] ? sock_has_perm+0x2a4/0x420 [ 25.731031] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.736371] ? __might_sleep+0x95/0x190 [ 25.740323] ? kasan_check_write+0x14/0x20 [ 25.744531] ? _copy_from_user+0x99/0x110 [ 25.748657] ? selinux_socket_sendmsg+0x36/0x40 [ 25.753297] ? security_socket_sendmsg+0x89/0xb0 [ 25.758035] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.762522] sock_sendmsg+0xca/0x110 [ 25.766211] ___sys_sendmsg+0x320/0x8b0 [ 25.770162] ? copy_msghdr_from_user+0x590/0x590 [ 25.774894] ? finish_task_switch+0x29b/0x890 [ 25.779364] ? copy_overflow+0x20/0x20 [ 25.783249] ? __fget_light+0x2b2/0x3c0 [ 25.787215] ? __pmd_alloc+0x4e0/0x4e0 [ 25.791072] ? check_noncircular+0x20/0x20 [ 25.795283] ? __fdget+0x18/0x20 [ 25.798626] __sys_sendmmsg+0x31b/0x620 [ 25.802574] ? __sys_sendmmsg+0x31b/0x620 [ 25.806701] ? SyS_sendmsg+0x50/0x50 [ 25.810396] ? __do_page_fault+0x5f7/0xc90 [ 25.814604] ? lock_downgrade+0x980/0x980 [ 25.818745] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.823296] ? vmacache_find+0x5f/0x280 [ 25.827257] ? up_read+0x1a/0x40 [ 25.830600] ? __do_page_fault+0x3d6/0xc90 [ 25.834819] compat_SyS_sendmmsg+0x32/0x40 [ 25.839027] ? compat_SyS_sendmsg+0x40/0x40 [ 25.843321] do_fast_syscall_32+0x3ee/0xfa1 [ 25.847622] ? do_int80_syscall_32+0x9d0/0x9d0 [ 25.852191] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.857701] ? syscall_return_slowpath+0x550/0x550 [ 25.862605] ? syscall_return_slowpath+0x2ac/0x550 [ 25.867685] ? retint_user+0x18/0x18 [ 25.871375] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.876194] entry_SYSENTER_compat+0x54/0x63 [ 25.880575