[....] Starting enhanced syslogd: rsyslogd[ 14.238708] audit: type=1400 audit(1518415997.090:5): avc: denied { syslog } for pid=3920 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: [ 19.448409] audit: type=1400 audit(1518416002.300:6): avc: denied { map } for pid=4061 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 '10.128.0.63' (ECDSA) to the list of known hosts. executing program [ 25.665583] audit: type=1400 audit(1518416008.517:7): avc: denied { map } for pid=4075 comm="syzkaller103701" path="/root/syzkaller103701948" 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 [ 25.691671] [ 25.693434] ============================= [ 25.697586] WARNING: suspicious RCU usage [ 25.701738] 4.16.0-rc1+ #309 Not tainted [ 25.705802] ----------------------------- [ 25.709957] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.719224] [ 25.719224] other info that might help us debug this: [ 25.719224] [ 25.727368] [ 25.727368] rcu_scheduler_active = 2, debug_locks = 1 [ 25.734039] 1 lock held by syzkaller103701/4075: [ 25.738793] #0: (rcu_read_lock){....}, at: [<000000004b51662f>] __rds_conn_create+0xe46/0x1b50 [ 25.747740] [ 25.747740] stack backtrace: [ 25.752244] CPU: 0 PID: 4075 Comm: syzkaller103701 Not tainted 4.16.0-rc1+ #309 [ 25.759667] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.768991] Call Trace: [ 25.771556] dump_stack+0x194/0x257 [ 25.775161] ? arch_local_irq_restore+0x53/0x53 [ 25.779817] lockdep_rcu_suspicious+0x123/0x170 [ 25.784461] ___might_sleep+0x385/0x470 [ 25.788407] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.794261] ? __debug_object_init+0x235/0x1040 [ 25.798906] ? debug_mutex_init+0x1c/0x60 [ 25.803034] __might_sleep+0x95/0x190 [ 25.806817] kmem_cache_alloc_trace+0x299/0x740 [ 25.811460] ? lock_acquire+0x1d5/0x580 [ 25.815407] ? lock_acquire+0x1d5/0x580 [ 25.819354] ? __rds_conn_create+0xe46/0x1b50 [ 25.823826] rds_loop_conn_alloc+0xc8/0x380 [ 25.828124] ? rds_loop_conn_free+0x290/0x290 [ 25.832604] ? __init_waitqueue_head+0x97/0x140 [ 25.837249] ? rcutorture_record_progress+0x10/0x10 [ 25.842239] ? __lockdep_init_map+0xe4/0x650 [ 25.846624] __rds_conn_create+0x112f/0x1b50 [ 25.851029] ? rds_conn_drop+0xb0/0xb0 [ 25.854901] ? __raw_spin_lock_init+0x1c/0x100 [ 25.859460] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.864453] ? __lockdep_init_map+0xe4/0x650 [ 25.868838] ? lockdep_init_map+0x9/0x10 [ 25.872874] ? __init_waitqueue_head+0x97/0x140 [ 25.877514] ? init_wait_entry+0x1b0/0x1b0 [ 25.881726] ? lockdep_init_map+0x9/0x10 [ 25.885762] ? rds_message_alloc+0x28c/0x330 [ 25.890153] ? rds_message_next_extension+0x210/0x210 [ 25.895313] ? trace_hardirqs_on+0xd/0x10 [ 25.899437] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.903822] ? __release_sock+0x360/0x360 [ 25.907939] ? lock_sock_nested+0x91/0x110 [ 25.912152] rds_conn_create_outgoing+0x3f/0x50 [ 25.916796] rds_sendmsg+0xda3/0x2390 [ 25.920566] ? avc_has_perm+0x43e/0x680 [ 25.924526] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.928994] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.933462] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.938453] ? find_held_lock+0x35/0x1d0 [ 25.942496] ? sock_has_perm+0x2a4/0x420 [ 25.946530] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.951866] ? lock_release+0xa22/0xa40 [ 25.955814] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.961672] ? __check_object_size+0x8b/0x530 [ 25.966150] ? __might_sleep+0x95/0x190 [ 25.970102] ? selinux_socket_sendmsg+0x36/0x40 [ 25.974747] ? security_socket_sendmsg+0x89/0xb0 [ 25.979475] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.983946] sock_sendmsg+0xca/0x110 [ 25.987635] SYSC_sendto+0x361/0x5c0 [ 25.991326] ? SYSC_connect+0x4a0/0x4a0 [ 25.995285] ? schedule+0xf5/0x430 [ 25.998799] ? SYSC_bind+0x290/0x410 [ 26.002502] ? exit_to_usermode_loop+0x8c/0x2f0 [ 26.007151] ? trace_hardirqs_off+0xd/0x10 [ 26.011359] ? exit_to_usermode_loop+0x198/0x2f0 [ 26.016093] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.021606] SyS_sendto+0x40/0x50 [ 26.025033] ? SyS_getpeername+0x30/0x30 [ 26.029070] do_syscall_64+0x282/0x940 [ 26.032930] ? __do_page_fault+0xc90/0xc90 [ 26.037138] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.041872] ? syscall_return_slowpath+0x550/0x550 [ 26.046773] ? syscall_return_slowpath+0x2ac/0x550 [ 26.051677] ? prepare_exit_to_usermode+0x350/0x350 [ 26.056669] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 26.062014] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.066849] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.072011] RIP: 0033:0x43fd99 [ 26.075174] RSP: 002b:00007ffdaad2a238 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.082853] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.090097] RDX: 0000000000000000 RSI: 0000000020c15000 RDI: 0000000000000003 [ 26.097339] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 26.104579] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 26.111820] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 26.119122] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.126572] in_atomic(): 1, irqs_disabled(): 0, pid: 4075, name: syzkaller103701 [ 26.134112] 1 lock held by syzkaller103701/4075: [ 26.138869] #0: (rcu_read_lock){....}, at: [<000000004b51662f>] __rds_conn_create+0xe46/0x1b50 [ 26.147822] CPU: 0 PID: 4075 Comm: syzkaller103701 Not tainted 4.16.0-rc1+ #309 [ 26.155256] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.164582] Call Trace: [ 26.167145] dump_stack+0x194/0x257 [ 26.170746] ? arch_local_irq_restore+0x53/0x53 [ 26.175388] ? print_lock+0x9f/0xa2 [ 26.178988] ? lockdep_print_held_locks+0xc4/0x130 [ 26.183897] ___might_sleep+0x2b2/0x470 [ 26.187846] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.193703] ? __debug_object_init+0x235/0x1040 [ 26.198344] ? debug_mutex_init+0x1c/0x60 [ 26.202468] __might_sleep+0x95/0x190 [ 26.206245] kmem_cache_alloc_trace+0x299/0x740 [ 26.210889] ? lock_acquire+0x1d5/0x580 [ 26.214836] ? lock_acquire+0x1d5/0x580 [ 26.218783] ? __rds_conn_create+0xe46/0x1b50 [ 26.223254] rds_loop_conn_alloc+0xc8/0x380 [ 26.227548] ? rds_loop_conn_free+0x290/0x290 [ 26.232019] ? __init_waitqueue_head+0x97/0x140 [ 26.236666] ? rcutorture_record_progress+0x10/0x10 [ 26.241655] ? __lockdep_init_map+0xe4/0x650 [ 26.246053] __rds_conn_create+0x112f/0x1b50 [ 26.250462] ? rds_conn_drop+0xb0/0xb0 [ 26.254331] ? __raw_spin_lock_init+0x1c/0x100 [ 26.258888] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.263884] ? __lockdep_init_map+0xe4/0x650 [ 26.268268] ? lockdep_init_map+0x9/0x10 [ 26.272302] ? __init_waitqueue_head+0x97/0x140 [ 26.276945] ? init_wait_entry+0x1b0/0x1b0 [ 26.281155] ? lockdep_init_map+0x9/0x10 [ 26.285195] ? rds_message_alloc+0x28c/0x330 [ 26.289575] ? rds_message_next_extension+0x210/0x210 [ 26.294737] ? trace_hardirqs_on+0xd/0x10 [ 26.298863] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.303251] ? __release_sock+0x360/0x360 [ 26.307370] ? lock_sock_nested+0x91/0x110 [ 26.311580] rds_conn_create_outgoing+0x3f/0x50 [ 26.316236] rds_sendmsg+0xda3/0x2390 [ 26.320010] ? avc_has_perm+0x43e/0x680 [ 26.323973] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.328445] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.332918] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.337915] ? find_held_lock+0x35/0x1d0 [ 26.341961] ? sock_has_perm+0x2a4/0x420 [ 26.345997] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.351337] ? lock_release+0xa22/0xa40 [ 26.355284] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.361141] ? __check_object_size+0x8b/0x530 [ 26.365615] ? __might_sleep+0x95/0x190 [ 26.369566] ? selinux_socket_sendmsg+0x36/0x40 [ 26.374208] ? security_socket_sendmsg+0x89/0xb0 [ 26.378938] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.383412] sock_sendmsg+0xca/0x110 [ 26.387102] SYSC_sendto+0x361/0x5c0 [ 26.390793] ? SYSC_connect+0x4a0/0x4a0 [ 26.394758] ? schedule+0xf5/0x430 [ 26.398270] ? SYSC_bind+0x290/0x410 [ 26.401977] ? exit_to_usermode_loop+0x8c/0x2f0 [ 26.406622] ? trace_hardirqs_off+0xd/0x10 [ 26.410829] ? exit_to_usermode_loop+0x198/0x2f0 [ 26.415561] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.421075] SyS_sendto+0x40/0x50 [ 26.424500] ? SyS_getpeername+0x30/0x30 [ 26.428537] do_syscall_64+0x282/0x940 [ 26.432397] ? __do_page_fault+0xc90/0xc90 [ 26.436603] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.441335] ? syscall_return_slowpath+0x550/0x550 [ 26.446238] ? syscall_return_slowpath+0x2ac/0x550 [ 26.451142] ? prepare_exit_to_usermode+0x350/0x350 [ 26.456132] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 26.461471] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.466292] entry_SYSCALL_64_