[....] Starting enhanced syslogd: rsyslogd[ 15.455517] audit: type=1400 audit(1518414788.088:5): avc: denied { syslog } for pid=3998 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.663684] audit: type=1400 audit(1518414790.296:6): avc: denied { map } for pid=4137 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 '10.128.0.36' (ECDSA) to the list of known hosts. executing program [ 23.934701] audit: type=1400 audit(1518414796.567:7): avc: denied { map } for pid=4151 comm="syzkaller593253" path="/root/syzkaller593253423" 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 [ 23.960872] [ 23.962667] ============================= [ 23.966823] WARNING: suspicious RCU usage [ 23.970981] 4.16.0-rc1+ #309 Not tainted [ 23.975062] ----------------------------- [ 23.979232] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 23.988523] [ 23.988523] other info that might help us debug this: [ 23.988523] [ 23.996674] [ 23.996674] rcu_scheduler_active = 2, debug_locks = 1 [ 24.003343] 1 lock held by syzkaller593253/4151: [ 24.008099] #0: (rcu_read_lock){....}, at: [<00000000e71d3fd2>] __rds_conn_create+0xe46/0x1b50 [ 24.017050] [ 24.017050] stack backtrace: [ 24.021550] CPU: 1 PID: 4151 Comm: syzkaller593253 Not tainted 4.16.0-rc1+ #309 [ 24.028970] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.038295] Call Trace: [ 24.040860] dump_stack+0x194/0x257 [ 24.044464] ? arch_local_irq_restore+0x53/0x53 [ 24.049120] lockdep_rcu_suspicious+0x123/0x170 [ 24.053765] ___might_sleep+0x385/0x470 [ 24.057710] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.063567] ? __debug_object_init+0x235/0x1040 [ 24.068210] ? lock_acquire+0x1d5/0x580 [ 24.072156] ? debug_mutex_init+0x1c/0x60 [ 24.076284] __might_sleep+0x95/0x190 [ 24.080063] kmem_cache_alloc_trace+0x299/0x740 [ 24.084707] ? lock_acquire+0x1d5/0x580 [ 24.088652] ? lock_acquire+0x1d5/0x580 [ 24.092609] ? __rds_conn_create+0xe46/0x1b50 [ 24.097084] rds_loop_conn_alloc+0xc8/0x380 [ 24.101386] ? rds_loop_conn_free+0x290/0x290 [ 24.105855] ? __init_waitqueue_head+0x97/0x140 [ 24.110502] ? rcutorture_record_progress+0x10/0x10 [ 24.115493] ? __lockdep_init_map+0xe4/0x650 [ 24.119878] __rds_conn_create+0x112f/0x1b50 [ 24.124282] ? rds_conn_drop+0xb0/0xb0 [ 24.128153] ? __raw_spin_lock_init+0x1c/0x100 [ 24.132709] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.137703] ? __lockdep_init_map+0xe4/0x650 [ 24.142088] ? lockdep_init_map+0x9/0x10 [ 24.146121] ? __init_waitqueue_head+0x97/0x140 [ 24.150761] ? init_wait_entry+0x1b0/0x1b0 [ 24.154973] ? lockdep_init_map+0x9/0x10 [ 24.159020] ? rds_message_alloc+0x28c/0x330 [ 24.163410] ? rds_message_next_extension+0x210/0x210 [ 24.168572] ? trace_hardirqs_on+0xd/0x10 [ 24.172700] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.177087] ? __release_sock+0x360/0x360 [ 24.181207] ? lock_sock_nested+0x91/0x110 [ 24.185421] rds_conn_create_outgoing+0x3f/0x50 [ 24.190068] rds_sendmsg+0xda3/0x2390 [ 24.193858] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.198332] ? lock_downgrade+0x980/0x980 [ 24.202458] ? find_held_lock+0x35/0x1d0 [ 24.206501] ? sock_has_perm+0x2a4/0x420 [ 24.210538] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.215874] ? lock_downgrade+0x980/0x980 [ 24.220010] ? dup_iter+0x252/0x260 [ 24.223613] ? lock_release+0xa40/0xa40 [ 24.227571] ? selinux_socket_sendmsg+0x36/0x40 [ 24.232215] ? security_socket_sendmsg+0x89/0xb0 [ 24.237314] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.241788] sock_sendmsg+0xca/0x110 [ 24.245477] ___sys_sendmsg+0x767/0x8b0 [ 24.249429] ? copy_msghdr_from_user+0x590/0x590 [ 24.254161] ? __pmd_alloc+0x4e0/0x4e0 [ 24.258021] ? check_noncircular+0x20/0x20 [ 24.262227] ? lock_acquire+0x1d5/0x580 [ 24.266173] ? check_noncircular+0x20/0x20 [ 24.270379] ? find_held_lock+0x35/0x1d0 [ 24.274416] ? __fget_light+0x2b2/0x3c0 [ 24.278363] ? fget_raw+0x20/0x20 [ 24.281790] ? handle_mm_fault+0x270/0x970 [ 24.286000] ? find_held_lock+0x35/0x1d0 [ 24.290044] ? __do_page_fault+0x5f7/0xc90 [ 24.294253] ? lock_downgrade+0x980/0x980 [ 24.298386] __sys_sendmsg+0xe5/0x210 [ 24.302158] ? __sys_sendmsg+0xe5/0x210 [ 24.306106] ? SyS_shutdown+0x290/0x290 [ 24.310058] ? __do_page_fault+0x3d6/0xc90 [ 24.314275] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.319791] SyS_sendmsg+0x2d/0x50 [ 24.323306] ? __sys_sendmsg+0x210/0x210 [ 24.327342] do_syscall_64+0x282/0x940 [ 24.331202] ? __do_page_fault+0xc90/0xc90 [ 24.335411] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.340139] ? syscall_return_slowpath+0x550/0x550 [ 24.345040] ? syscall_return_slowpath+0x2ac/0x550 [ 24.349944] ? prepare_exit_to_usermode+0x350/0x350 [ 24.354935] ? retint_user+0x18/0x18 [ 24.358625] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.363449] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.368607] RIP: 0033:0x43fe29 [ 24.371770] RSP: 002b:00007ffc4609b118 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 24.379450] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fe29 [ 24.386690] RDX: 0000000000000000 RSI: 0000000020fc5fc8 RDI: 0000000000000003 [ 24.393932] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 24.401173] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 24.408414] R13: 00000000004017e0 R14: 0000000000000000 R15: 0000000000000000 [ 24.415711] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 24.423167] in_atomic(): 1, irqs_disabled(): 0, pid: 4151, name: syzkaller593253 [ 24.430708] 1 lock held by syzkaller593253/4151: [ 24.435463] #0: (rcu_read_lock){....}, at: [<00000000e71d3fd2>] __rds_conn_create+0xe46/0x1b50 [ 24.444417] CPU: 1 PID: 4151 Comm: syzkaller593253 Not tainted 4.16.0-rc1+ #309 [ 24.451842] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.461168] Call Trace: [ 24.463728] dump_stack+0x194/0x257 [ 24.467331] ? arch_local_irq_restore+0x53/0x53 [ 24.471972] ? print_lock+0x9f/0xa2 [ 24.475577] ? lockdep_print_held_locks+0xc4/0x130 [ 24.480486] ___might_sleep+0x2b2/0x470 [ 24.484431] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 24.490284] ? __debug_object_init+0x235/0x1040 [ 24.494921] ? lock_acquire+0x1d5/0x580 [ 24.498869] ? debug_mutex_init+0x1c/0x60 [ 24.502993] __might_sleep+0x95/0x190 [ 24.506771] kmem_cache_alloc_trace+0x299/0x740 [ 24.511415] ? lock_acquire+0x1d5/0x580 [ 24.515361] ? lock_acquire+0x1d5/0x580 [ 24.519316] ? __rds_conn_create+0xe46/0x1b50 [ 24.523788] rds_loop_conn_alloc+0xc8/0x380 [ 24.528090] ? rds_loop_conn_free+0x290/0x290 [ 24.532561] ? __init_waitqueue_head+0x97/0x140 [ 24.537210] ? rcutorture_record_progress+0x10/0x10 [ 24.542203] ? __lockdep_init_map+0xe4/0x650 [ 24.546588] __rds_conn_create+0x112f/0x1b50 [ 24.550987] ? rds_conn_drop+0xb0/0xb0 [ 24.554856] ? __raw_spin_lock_init+0x1c/0x100 [ 24.559412] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.564405] ? __lockdep_init_map+0xe4/0x650 [ 24.568790] ? lockdep_init_map+0x9/0x10 [ 24.572823] ? __init_waitqueue_head+0x97/0x140 [ 24.577465] ? init_wait_entry+0x1b0/0x1b0 [ 24.581675] ? lockdep_init_map+0x9/0x10 [ 24.585712] ? rds_message_alloc+0x28c/0x330 [ 24.590092] ? rds_message_next_extension+0x210/0x210 [ 24.595254] ? trace_hardirqs_on+0xd/0x10 [ 24.599376] ? _raw_spin_unlock_bh+0x30/0x40 [ 24.603763] ? __release_sock+0x360/0x360 [ 24.607883] ? lock_sock_nested+0x91/0x110 [ 24.612099] rds_conn_create_outgoing+0x3f/0x50 [ 24.616743] rds_sendmsg+0xda3/0x2390 [ 24.620535] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.625009] ? lock_downgrade+0x980/0x980 [ 24.629138] ? find_held_lock+0x35/0x1d0 [ 24.633178] ? sock_has_perm+0x2a4/0x420 [ 24.637214] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 24.642552] ? lock_downgrade+0x980/0x980 [ 24.646680] ? dup_iter+0x252/0x260 [ 24.650282] ? lock_release+0xa40/0xa40 [ 24.654243] ? selinux_socket_sendmsg+0x36/0x40 [ 24.658882] ? security_socket_sendmsg+0x89/0xb0 [ 24.663614] ? rds_send_drop_to+0x19d0/0x19d0 [ 24.668091] sock_sendmsg+0xca/0x110 [ 24.671781] ___sys_sendmsg+0x767/0x8b0 [ 24.675732] ? copy_msghdr_from_user+0x590/0x590 [ 24.680465] ? __pmd_alloc+0x4e0/0x4e0 [ 24.684323] ? check_noncircular+0x20/0x20 [ 24.688528] ? lock_acquire+0x1d5/0x580 [ 24.692482] ? check_noncircular+0x20/0x20 [ 24.696689] ? find_held_lock+0x35/0x1d0 [ 24.700727] ? __fget_light+0x2b2/0x3c0 [ 24.704671] ? fget_raw+0x20/0x20 [ 24.708098] ? handle_mm_fault+0x270/0x970 [ 24.712307] ? find_held_lock+0x35/0x1d0 [ 24.716348] ? __do_page_fault+0x5f7/0xc90 [ 24.720555] ? lock_downgrade+0x980/0x980 [ 24.724689] __sys_sendmsg+0xe5/0x210 [ 24.728463] ? __sys_sendmsg+0xe5/0x210 [ 24.732409] ? SyS_shutdown+0x290/0x290 [ 24.736364] ? __do_page_fault+0x3d6/0xc90 [ 24.740585] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 24.746104] SyS_sendmsg+0x2d/0x50 [ 24.749617] ? __sys_sendmsg+0x210/0x210 [ 24.753649] do_syscall_64+0x282/0x940 [ 24.757505] ? __do_page_fault+0xc90/0xc90 [ 24.761710] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 24.766439] ? syscall_return_slowpath+0x550/0x550 [ 24.771342] ? syscall_return_slowpath+0x2ac/0x550 [ 24.776244] ? prepare_exit_to_usermode+0x350/0x350 [ 24.781236] ? retint_user+0x18/0x18 [ 24.784926] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.789748] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 24.794908] RIP: 0033:0x43fe29 [ 24.798068] RSP: 002b:00007ffc4609b118 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 24.805748] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fe29 [ 24.812991] RDX: 0000000000000000 RSI: 0000000020fc5fc8 RDI: 0000000000000003 [ 24.820231] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 24.827480] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401750 [ 24.834728] R13: 00000000004017e0 R14: 0000