[....] Starting enhanced syslogd: rsyslogd[ 15.026766] audit: type=1400 audit(1518412290.979:5): 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 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: [ 19.235646] audit: type=1400 audit(1518412295.188:6): 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 '10.128.15.204' (ECDSA) to the list of known hosts. executing program [ 25.470560] audit: type=1400 audit(1518412301.423:7): avc: denied { map } for pid=4151 comm="syzkaller625806" path="/root/syzkaller625806319" 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 [ 25.497405] [ 25.499096] ============================= [ 25.503257] WARNING: suspicious RCU usage [ 25.507410] 4.16.0-rc1+ #309 Not tainted [ 25.511483] ----------------------------- [ 25.515636] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.524912] [ 25.524912] other info that might help us debug this: [ 25.524912] [ 25.533061] [ 25.533061] rcu_scheduler_active = 2, debug_locks = 1 [ 25.539729] 1 lock held by syzkaller625806/4151: [ 25.544485] #0: (rcu_read_lock){....}, at: [<0000000068642bbb>] __rds_conn_create+0xe46/0x1b50 [ 25.553434] [ 25.553434] stack backtrace: [ 25.557938] CPU: 0 PID: 4151 Comm: syzkaller625806 Not tainted 4.16.0-rc1+ #309 [ 25.565361] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.574687] Call Trace: [ 25.577249] dump_stack+0x194/0x257 [ 25.580851] ? arch_local_irq_restore+0x53/0x53 [ 25.585505] lockdep_rcu_suspicious+0x123/0x170 [ 25.590148] ___might_sleep+0x385/0x470 [ 25.594095] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.599948] ? __debug_object_init+0x235/0x1040 [ 25.604588] ? debug_mutex_init+0x1c/0x60 [ 25.608710] __might_sleep+0x95/0x190 [ 25.612488] kmem_cache_alloc_trace+0x299/0x740 [ 25.617128] ? lock_acquire+0x1d5/0x580 [ 25.621071] ? lock_acquire+0x1d5/0x580 [ 25.625016] ? __rds_conn_create+0xe46/0x1b50 [ 25.629485] rds_loop_conn_alloc+0xc8/0x380 [ 25.633778] ? rds_loop_conn_free+0x290/0x290 [ 25.638246] ? __init_waitqueue_head+0x97/0x140 [ 25.642889] ? rcutorture_record_progress+0x10/0x10 [ 25.647876] ? __lockdep_init_map+0xe4/0x650 [ 25.652262] __rds_conn_create+0x112f/0x1b50 [ 25.656660] ? rds_conn_drop+0xb0/0xb0 [ 25.660530] ? __raw_spin_lock_init+0x1c/0x100 [ 25.665084] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.670080] ? __lockdep_init_map+0xe4/0x650 [ 25.674467] ? lockdep_init_map+0x9/0x10 [ 25.678500] ? __init_waitqueue_head+0x97/0x140 [ 25.683144] ? init_wait_entry+0x1b0/0x1b0 [ 25.687353] ? lockdep_init_map+0x9/0x10 [ 25.691392] ? rds_message_alloc+0x28c/0x330 [ 25.695772] ? rds_message_next_extension+0x210/0x210 [ 25.700932] ? trace_hardirqs_on+0xd/0x10 [ 25.705058] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.709441] ? __release_sock+0x360/0x360 [ 25.713559] ? lock_sock_nested+0x91/0x110 [ 25.717769] rds_conn_create_outgoing+0x3f/0x50 [ 25.722413] rds_sendmsg+0xda3/0x2390 [ 25.726186] ? avc_has_perm+0x43e/0x680 [ 25.730147] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.734615] ? _raw_spin_unlock_irq+0x27/0x70 [ 25.739089] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.744082] ? find_held_lock+0x35/0x1d0 [ 25.748125] ? sock_has_perm+0x2a4/0x420 [ 25.752159] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.757493] ? lock_release+0xa22/0xa40 [ 25.761439] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.767297] ? __check_object_size+0x8b/0x530 [ 25.771764] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.776237] ? __might_sleep+0x95/0x190 [ 25.780189] ? selinux_socket_sendmsg+0x36/0x40 [ 25.784832] ? security_socket_sendmsg+0x89/0xb0 [ 25.789561] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.794030] sock_sendmsg+0xca/0x110 [ 25.797721] SYSC_sendto+0x361/0x5c0 [ 25.801413] ? SYSC_connect+0x4a0/0x4a0 [ 25.805366] ? __do_page_fault+0x5f7/0xc90 [ 25.809574] ? lock_downgrade+0x980/0x980 [ 25.813703] ? handle_mm_fault+0x43b/0x970 [ 25.817921] ? up_read+0x1a/0x40 [ 25.821258] ? __do_page_fault+0x3d6/0xc90 [ 25.825474] ? mm_fault_error+0x2c0/0x2c0 [ 25.829596] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 25.835108] SyS_sendto+0x40/0x50 [ 25.838536] ? SyS_getpeername+0x30/0x30 [ 25.842570] do_syscall_64+0x282/0x940 [ 25.846429] ? __do_page_fault+0xc90/0xc90 [ 25.850649] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.855379] ? syscall_return_slowpath+0x550/0x550 [ 25.860282] ? syscall_return_slowpath+0x2ac/0x550 [ 25.865183] ? prepare_exit_to_usermode+0x350/0x350 [ 25.870171] ? retint_user+0x18/0x18 [ 25.873860] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.878682] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.883841] RIP: 0033:0x43fd99 [ 25.887000] RSP: 002b:00007ffc74aa1618 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.894688] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 25.901927] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 25.909166] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 25.916405] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004016c0 [ 25.923644] R13: 0000000000401750 R14: 0000000000000000 R15: 0000000000000000 [ 25.930980] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.938435] in_atomic(): 1, irqs_disabled(): 0, pid: 4151, name: syzkaller625806 [ 25.945974] 1 lock held by syzkaller625806/4151: [ 25.950727] #0: (rcu_read_lock){....}, at: [<0000000068642bbb>] __rds_conn_create+0xe46/0x1b50 [ 25.959676] CPU: 0 PID: 4151 Comm: syzkaller625806 Not tainted 4.16.0-rc1+ #309 [ 25.967101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.976424] Call Trace: [ 25.978982] dump_stack+0x194/0x257 [ 25.982586] ? arch_local_irq_restore+0x53/0x53 [ 25.987231] ? print_lock+0x9f/0xa2 [ 25.990832] ? lockdep_print_held_locks+0xc4/0x130 [ 25.995740] ___might_sleep+0x2b2/0x470 [ 25.999685] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.005763] ? __debug_object_init+0x235/0x1040 [ 26.010408] ? debug_mutex_init+0x1c/0x60 [ 26.014532] __might_sleep+0x95/0x190 [ 26.018309] kmem_cache_alloc_trace+0x299/0x740 [ 26.022951] ? lock_acquire+0x1d5/0x580 [ 26.026894] ? lock_acquire+0x1d5/0x580 [ 26.030842] ? __rds_conn_create+0xe46/0x1b50 [ 26.035313] rds_loop_conn_alloc+0xc8/0x380 [ 26.039612] ? rds_loop_conn_free+0x290/0x290 [ 26.044079] ? __init_waitqueue_head+0x97/0x140 [ 26.048721] ? rcutorture_record_progress+0x10/0x10 [ 26.053707] ? __lockdep_init_map+0xe4/0x650 [ 26.058091] __rds_conn_create+0x112f/0x1b50 [ 26.062490] ? rds_conn_drop+0xb0/0xb0 [ 26.066361] ? __raw_spin_lock_init+0x1c/0x100 [ 26.070914] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.075905] ? __lockdep_init_map+0xe4/0x650 [ 26.080289] ? lockdep_init_map+0x9/0x10 [ 26.084320] ? __init_waitqueue_head+0x97/0x140 [ 26.088958] ? init_wait_entry+0x1b0/0x1b0 [ 26.093170] ? lockdep_init_map+0x9/0x10 [ 26.097204] ? rds_message_alloc+0x28c/0x330 [ 26.101585] ? rds_message_next_extension+0x210/0x210 [ 26.106745] ? trace_hardirqs_on+0xd/0x10 [ 26.110867] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.115257] ? __release_sock+0x360/0x360 [ 26.119377] ? lock_sock_nested+0x91/0x110 [ 26.123589] rds_conn_create_outgoing+0x3f/0x50 [ 26.128234] rds_sendmsg+0xda3/0x2390 [ 26.132007] ? avc_has_perm+0x43e/0x680 [ 26.135972] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.140439] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.144906] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.149900] ? find_held_lock+0x35/0x1d0 [ 26.153938] ? sock_has_perm+0x2a4/0x420 [ 26.157972] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.163306] ? lock_release+0xa22/0xa40 [ 26.167253] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.173108] ? __check_object_size+0x8b/0x530 [ 26.177575] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.182047] ? __might_sleep+0x95/0x190 [ 26.185995] ? selinux_socket_sendmsg+0x36/0x40 [ 26.190641] ? security_socket_sendmsg+0x89/0xb0 [ 26.195366] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.199835] sock_sendmsg+0xca/0x110 [ 26.203527] SYSC_sendto+0x361/0x5c0 [ 26.207218] ? SYSC_connect+0x4a0/0x4a0 [ 26.211167] ? __do_page_fault+0x5f7/0xc90 [ 26.215376] ? lock_downgrade+0x980/0x980 [ 26.219503] ? handle_mm_fault+0x43b/0x970 [ 26.223720] ? up_read+0x1a/0x40 [ 26.227059] ? __do_page_fault+0x3d6/0xc90 [ 26.231276] ? mm_fault_error+0x2c0/0x2c0 [ 26.235396] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 26.240920] SyS_sendto+0x40/0x50 [ 26.244348] ? SyS_getpeername+0x30/0x30 [ 26.248383] do_syscall_64+0x282/0x940 [ 26.252243] ? __do_page_fault+0xc90/0xc90 [ 26.256448] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.261176] ? syscall_return_slowpath+0x550/0x550 [ 26.266078] ? syscall_return_slowpath+0x2ac/0x550 [ 26.270977] ? prepare_exit_to_usermode+0x350/0x350 [ 26.275965] ? retint_user+0x18/0x18 [ 26.279653] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.284475] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.289633] RIP: 0033:0x43fd99 [ 26.292792] RSP: 002b:00007ffc74aa1618 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.300467] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd99 [ 26.307706] RDX: 0000000000000000 RSI: 0000000020218000 RDI: 0000000000000003 [ 26.314944] RBP: 00000000006ca018 R08: 0000000020062000 R09: 0000000000000010 [ 26.322183] R10: 000000