[....] Starting enhanced syslogd: rsyslogd[ 15.865986] audit: type=1400 audit(1518424088.341:5): avc: denied { syslog } for pid=4016 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: [ 20.058418] audit: type=1400 audit(1518424092.534:6): avc: denied { map } for pid=4156 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 '10.128.15.205' (ECDSA) to the list of known hosts. executing program [ 31.312880] audit: type=1400 audit(1518424103.788:7): avc: denied { map } for pid=4171 comm="syzkaller161886" path="/root/syzkaller161886059" 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 [ 31.340212] [ 31.341906] ============================= [ 31.346048] WARNING: suspicious RCU usage [ 31.350188] 4.15.0+ #222 Not tainted [ 31.353900] ----------------------------- [ 31.358051] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 31.367311] [ 31.367311] other info that might help us debug this: [ 31.367311] [ 31.375444] [ 31.375444] rcu_scheduler_active = 2, debug_locks = 1 [ 31.382102] 1 lock held by syzkaller161886/4171: [ 31.386844] #0: (rcu_read_lock){....}, at: [<00000000f19b66d2>] __rds_conn_create+0xe46/0x1b50 [ 31.395780] [ 31.395780] stack backtrace: [ 31.400274] CPU: 0 PID: 4171 Comm: syzkaller161886 Not tainted 4.15.0+ #222 [ 31.407342] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.416665] Call Trace: [ 31.419230] dump_stack+0x194/0x257 [ 31.422833] ? arch_local_irq_restore+0x53/0x53 [ 31.427492] lockdep_rcu_suspicious+0x123/0x170 [ 31.432137] ___might_sleep+0x385/0x470 [ 31.436089] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 31.441950] ? __debug_object_init+0x235/0x1040 [ 31.446595] ? debug_mutex_init+0x1c/0x60 [ 31.450717] __might_sleep+0x95/0x190 [ 31.454496] kmem_cache_alloc_trace+0x299/0x740 [ 31.459140] ? lock_acquire+0x1d5/0x580 [ 31.463085] ? lock_acquire+0x1d5/0x580 [ 31.467030] ? __rds_conn_create+0xe46/0x1b50 [ 31.471500] rds_loop_conn_alloc+0xc8/0x380 [ 31.475795] ? rds_loop_conn_free+0x290/0x290 [ 31.480264] ? __init_waitqueue_head+0x97/0x140 [ 31.484910] ? rcutorture_record_progress+0x10/0x10 [ 31.489900] ? __lockdep_init_map+0xe4/0x650 [ 31.494287] __rds_conn_create+0x112f/0x1b50 [ 31.498689] ? rds_conn_drop+0xb0/0xb0 [ 31.502557] ? __raw_spin_lock_init+0x1c/0x100 [ 31.507111] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.512102] ? __lockdep_init_map+0xe4/0x650 [ 31.516483] ? lockdep_init_map+0x9/0x10 [ 31.520520] ? __init_waitqueue_head+0x97/0x140 [ 31.525165] ? init_wait_entry+0x1b0/0x1b0 [ 31.529378] ? lockdep_init_map+0x9/0x10 [ 31.533415] ? rds_message_alloc+0x28c/0x330 [ 31.537802] ? rds_message_next_extension+0x210/0x210 [ 31.542961] ? trace_hardirqs_on+0xd/0x10 [ 31.547085] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.551469] ? __release_sock+0x360/0x360 [ 31.555588] ? lock_sock_nested+0x91/0x110 [ 31.559796] rds_conn_create_outgoing+0x3f/0x50 [ 31.564436] rds_sendmsg+0xda3/0x2390 [ 31.568207] ? avc_has_perm+0x43e/0x680 [ 31.572165] ? rds_send_drop_to+0x19d0/0x19d0 [ 31.576638] ? lock_downgrade+0x980/0x980 [ 31.580761] ? rw_copy_check_uvector+0x1be/0x280 [ 31.585495] ? sock_has_perm+0x2a4/0x420 [ 31.589532] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 31.594867] ? dup_iter+0x1a2/0x260 [ 31.598475] ? kasan_check_write+0x14/0x20 [ 31.602690] ? copy_msghdr_from_user+0x3a6/0x590 [ 31.607420] ? check_noncircular+0x20/0x20 [ 31.611634] ? selinux_socket_sendmsg+0x36/0x40 [ 31.616276] ? security_socket_sendmsg+0x89/0xb0 [ 31.621005] ? rds_send_drop_to+0x19d0/0x19d0 [ 31.625474] sock_sendmsg+0xca/0x110 [ 31.629165] ___sys_sendmsg+0x767/0x8b0 [ 31.633122] ? copy_msghdr_from_user+0x590/0x590 [ 31.637855] ? __pmd_alloc+0x4e0/0x4e0 [ 31.641726] ? check_noncircular+0x20/0x20 [ 31.645932] ? lock_release+0xa40/0xa40 [ 31.649879] ? lock_acquire+0x1d5/0x580 [ 31.653822] ? check_noncircular+0x20/0x20 [ 31.658029] ? find_held_lock+0x35/0x1d0 [ 31.662067] ? __fget_light+0x2b2/0x3c0 [ 31.666013] ? fget_raw+0x20/0x20 [ 31.669438] ? handle_mm_fault+0x270/0x970 [ 31.673647] ? find_held_lock+0x35/0x1d0 [ 31.677687] ? __do_page_fault+0x5f7/0xc90 [ 31.681896] ? lock_downgrade+0x980/0x980 [ 31.686025] __sys_sendmsg+0xe5/0x210 [ 31.689798] ? __sys_sendmsg+0xe5/0x210 [ 31.693743] ? SyS_shutdown+0x290/0x290 [ 31.697695] ? __do_page_fault+0x3d6/0xc90 [ 31.701912] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 31.707424] SyS_sendmsg+0x2d/0x50 [ 31.710934] ? __sys_sendmsg+0x210/0x210 [ 31.714967] do_syscall_64+0x282/0x940 [ 31.718824] ? __do_page_fault+0xc90/0xc90 [ 31.723028] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.727756] ? syscall_return_slowpath+0x550/0x550 [ 31.732656] ? syscall_return_slowpath+0x2ac/0x550 [ 31.737565] ? prepare_exit_to_usermode+0x350/0x350 [ 31.742558] ? retint_user+0x18/0x18 [ 31.746252] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.751073] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 31.756234] RIP: 0033:0x43fdf9 [ 31.759395] RSP: 002b:00007ffeb0acf558 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 31.767071] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 31.774309] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [ 31.781551] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 31.788792] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401720 [ 31.796030] R13: 00000000004017b0 R14: 0000000000000000 R15: 0000000000000000 [ 31.803341] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 31.810777] in_atomic(): 1, irqs_disabled(): 0, pid: 4171, name: syzkaller161886 [ 31.818307] 1 lock held by syzkaller161886/4171: [ 31.823047] #0: (rcu_read_lock){....}, at: [<00000000f19b66d2>] __rds_conn_create+0xe46/0x1b50 [ 31.831982] CPU: 0 PID: 4171 Comm: syzkaller161886 Not tainted 4.15.0+ #222 [ 31.839050] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.848374] Call Trace: [ 31.850931] dump_stack+0x194/0x257 [ 31.854532] ? arch_local_irq_restore+0x53/0x53 [ 31.859176] ? print_lock+0x9f/0xa2 [ 31.862774] ? lockdep_print_held_locks+0xc4/0x130 [ 31.867682] ___might_sleep+0x2b2/0x470 [ 31.871631] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 31.877488] ? __debug_object_init+0x235/0x1040 [ 31.882133] ? debug_mutex_init+0x1c/0x60 [ 31.886255] __might_sleep+0x95/0x190 [ 31.890031] kmem_cache_alloc_trace+0x299/0x740 [ 31.894674] ? lock_acquire+0x1d5/0x580 [ 31.898621] ? lock_acquire+0x1d5/0x580 [ 31.902566] ? __rds_conn_create+0xe46/0x1b50 [ 31.907040] rds_loop_conn_alloc+0xc8/0x380 [ 31.911335] ? rds_loop_conn_free+0x290/0x290 [ 31.915804] ? __init_waitqueue_head+0x97/0x140 [ 31.920447] ? rcutorture_record_progress+0x10/0x10 [ 31.925435] ? __lockdep_init_map+0xe4/0x650 [ 31.929820] __rds_conn_create+0x112f/0x1b50 [ 31.934221] ? rds_conn_drop+0xb0/0xb0 [ 31.938090] ? __raw_spin_lock_init+0x1c/0x100 [ 31.942647] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.947638] ? __lockdep_init_map+0xe4/0x650 [ 31.952030] ? lockdep_init_map+0x9/0x10 [ 31.956063] ? __init_waitqueue_head+0x97/0x140 [ 31.960701] ? init_wait_entry+0x1b0/0x1b0 [ 31.964909] ? lockdep_init_map+0x9/0x10 [ 31.968944] ? rds_message_alloc+0x28c/0x330 [ 31.973326] ? rds_message_next_extension+0x210/0x210 [ 31.978487] ? trace_hardirqs_on+0xd/0x10 [ 31.982608] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.986993] ? __release_sock+0x360/0x360 [ 31.991109] ? lock_sock_nested+0x91/0x110 [ 31.995319] rds_conn_create_outgoing+0x3f/0x50 [ 31.999960] rds_sendmsg+0xda3/0x2390 [ 32.003733] ? avc_has_perm+0x43e/0x680 [ 32.007698] ? rds_send_drop_to+0x19d0/0x19d0 [ 32.012170] ? lock_downgrade+0x980/0x980 [ 32.016294] ? rw_copy_check_uvector+0x1be/0x280 [ 32.021028] ? sock_has_perm+0x2a4/0x420 [ 32.025062] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 32.030396] ? dup_iter+0x1a2/0x260 [ 32.033997] ? kasan_check_write+0x14/0x20 [ 32.038214] ? copy_msghdr_from_user+0x3a6/0x590 [ 32.042939] ? check_noncircular+0x20/0x20 [ 32.047152] ? selinux_socket_sendmsg+0x36/0x40 [ 32.051799] ? security_socket_sendmsg+0x89/0xb0 [ 32.056533] ? rds_send_drop_to+0x19d0/0x19d0 [ 32.061016] sock_sendmsg+0xca/0x110 [ 32.064710] ___sys_sendmsg+0x767/0x8b0 [ 32.068670] ? copy_msghdr_from_user+0x590/0x590 [ 32.073406] ? __pmd_alloc+0x4e0/0x4e0 [ 32.077265] ? check_noncircular+0x20/0x20 [ 32.081470] ? lock_release+0xa40/0xa40 [ 32.085415] ? lock_acquire+0x1d5/0x580 [ 32.089359] ? check_noncircular+0x20/0x20 [ 32.093567] ? find_held_lock+0x35/0x1d0 [ 32.097619] ? __fget_light+0x2b2/0x3c0 [ 32.101568] ? fget_raw+0x20/0x20 [ 32.104996] ? handle_mm_fault+0x270/0x970 [ 32.109209] ? find_held_lock+0x35/0x1d0 [ 32.113250] ? __do_page_fault+0x5f7/0xc90 [ 32.117456] ? lock_downgrade+0x980/0x980 [ 32.121584] __sys_sendmsg+0xe5/0x210 [ 32.125356] ? __sys_sendmsg+0xe5/0x210 [ 32.129301] ? SyS_shutdown+0x290/0x290 [ 32.133255] ? __do_page_fault+0x3d6/0xc90 [ 32.137473] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 32.142986] SyS_sendmsg+0x2d/0x50 [ 32.146497] ? __sys_sendmsg+0x210/0x210 [ 32.150533] do_syscall_64+0x282/0x940 [ 32.154391] ? __do_page_fault+0xc90/0xc90 [ 32.158601] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.163330] ? syscall_return_slowpath+0x550/0x550 [ 32.168234] ? syscall_return_slowpath+0x2ac/0x550 [ 32.173135] ? prepare_exit_to_usermode+0x350/0x350 [ 32.178122] ? retint_user+0x18/0x18 [ 32.181815] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.186636] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 32.191793] RIP: 0033:0x43fdf9 [ 32.194954] RSP: 002b:00007ffeb0acf558 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 32.202633] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdf9 [ 32.209871] RDX: 0000000000000000 RSI: 0000000020159fc8 RDI: 0000000000000003 [