[....] Starting enhanced syslogd: rsyslogd[ 15.489607] audit: type=1400 audit(1518426492.589:5): avc: denied { syslog } for pid=3999 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: [ 19.108811] audit: type=1400 audit(1518426496.208:6): avc: denied { map } for pid=4138 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 '10.128.15.194' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 37.761769] audit: type=1400 audit(1518426514.861:7): avc: denied { map } for pid=4155 comm="syzkaller666532" path="/root/syzkaller666532704" 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 RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 38.018352] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 38.317301] [ 38.318997] ============================= [ 38.323146] WARNING: suspicious RCU usage [ 38.327284] 4.16.0-rc1+ #309 Not tainted [ 38.331341] ----------------------------- [ 38.335481] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 38.344762] [ 38.344762] other info that might help us debug this: [ 38.344762] [ 38.352904] [ 38.352904] rcu_scheduler_active = 2, debug_locks = 1 [ 38.359567] 1 lock held by syzkaller666532/4155: [ 38.364310] #0: (rcu_read_lock){....}, at: [<000000004e6d2b6a>] __rds_conn_create+0xe46/0x1b50 [ 38.373253] [ 38.373253] stack backtrace: [ 38.377740] CPU: 1 PID: 4155 Comm: syzkaller666532 Not tainted 4.16.0-rc1+ #309 [ 38.385157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.394514] Call Trace: [ 38.397079] dump_stack+0x194/0x257 [ 38.400681] ? arch_local_irq_restore+0x53/0x53 [ 38.405331] lockdep_rcu_suspicious+0x123/0x170 [ 38.409973] ___might_sleep+0x385/0x470 [ 38.413916] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 38.419768] ? debug_mutex_init+0x1c/0x60 [ 38.423891] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.428881] __might_sleep+0x95/0x190 [ 38.432659] kmem_cache_alloc+0x2a2/0x760 [ 38.436775] ? lock_acquire+0x1d5/0x580 [ 38.440718] ? __rds_conn_create+0xe46/0x1b50 [ 38.445184] ? SyS_membarrier+0x700/0x700 [ 38.449302] ? init_timer_key+0x163/0x3f0 [ 38.453425] rds_tcp_conn_alloc+0xa7/0x4e0 [ 38.457633] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 38.462009] ? rds_cmsg_atomic+0xff0/0xff0 [ 38.466216] ? __lockdep_init_map+0xe4/0x650 [ 38.470596] ? rds_cmsg_atomic+0xff0/0xff0 [ 38.474803] __rds_conn_create+0x112f/0x1b50 [ 38.479198] ? rds_conn_drop+0xb0/0xb0 [ 38.483069] ? __raw_spin_lock_init+0x1c/0x100 [ 38.487797] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.492789] ? __lockdep_init_map+0xe4/0x650 [ 38.497169] ? lockdep_init_map+0x9/0x10 [ 38.501200] ? __init_waitqueue_head+0x97/0x140 [ 38.505841] ? init_wait_entry+0x1b0/0x1b0 [ 38.510052] ? lockdep_init_map+0x9/0x10 [ 38.514089] ? rds_message_alloc+0x28c/0x330 [ 38.518468] ? rds_message_next_extension+0x210/0x210 [ 38.523627] ? trace_hardirqs_on+0xd/0x10 [ 38.527753] ? _raw_spin_unlock_bh+0x30/0x40 [ 38.532138] ? __release_sock+0x360/0x360 [ 38.536255] ? lock_sock_nested+0x91/0x110 [ 38.540469] rds_conn_create_outgoing+0x3f/0x50 [ 38.545115] rds_sendmsg+0xda3/0x2390 [ 38.548889] ? avc_has_perm+0x43e/0x680 [ 38.552850] ? rds_send_drop_to+0x19d0/0x19d0 [ 38.557316] ? release_sock+0x1d4/0x2a0 [ 38.561270] ? lock_downgrade+0x980/0x980 [ 38.565401] ? find_held_lock+0x35/0x1d0 [ 38.569444] ? sock_has_perm+0x2a4/0x420 [ 38.573478] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 38.578810] ? lock_release+0xa22/0xa40 [ 38.582755] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 38.588610] ? __check_object_size+0x8b/0x530 [ 38.593077] ? __handle_mm_fault+0x80e/0x3ce0 [ 38.597546] ? __might_sleep+0x95/0x190 [ 38.601496] ? selinux_socket_sendmsg+0x36/0x40 [ 38.606138] ? security_socket_sendmsg+0x89/0xb0 [ 38.610866] ? rds_send_drop_to+0x19d0/0x19d0 [ 38.615340] sock_sendmsg+0xca/0x110 [ 38.619028] SYSC_sendto+0x361/0x5c0 [ 38.622716] ? SYSC_connect+0x4a0/0x4a0 [ 38.626670] ? __do_page_fault+0x5f7/0xc90 [ 38.630876] ? lock_downgrade+0x980/0x980 [ 38.635001] ? handle_mm_fault+0x43b/0x970 [ 38.639218] ? up_read+0x1a/0x40 [ 38.642555] ? __do_page_fault+0x3d6/0xc90 [ 38.646767] ? mm_fault_error+0x2c0/0x2c0 [ 38.650887] ? kernel_write+0x120/0x120 [ 38.654835] SyS_sendto+0x40/0x50 [ 38.658258] ? SyS_getpeername+0x30/0x30 [ 38.662292] do_syscall_64+0x282/0x940 [ 38.666150] ? __do_page_fault+0xc90/0xc90 [ 38.670358] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 38.675085] ? syscall_return_slowpath+0x550/0x550 [ 38.679984] ? syscall_return_slowpath+0x2ac/0x550 [ 38.684883] ? prepare_exit_to_usermode+0x350/0x350 [ 38.689872] ? retint_user+0x18/0x18 [ 38.693578] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.698398] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 38.703557] RIP: 0033:0x444f09 [ 38.706714] RSP: 002b:00007ffe01ae99c8 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 38.714390] RAX: ffffffffffffffda RBX: 00000000004a682b RCX: 0000000000444f09 [ 38.721630] RDX: 0000000000000000 RSI: 0000000020a3cfff RDI: 0000000000000004 [ 38.728872] RBP: 00007ffe01ae9a78 R08: 0000000020dfcff0 R09: 0000000000000010 [ 38.736120] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe01ae9a78 [ 38.743359] R13: 0000000000402490 R14: 0000000000000000 R15: 0000000000000000 [ 38.750920] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 38.758539] in_atomic(): 1, irqs_disabled(): 0, pid: 4155, name: syzkaller666532 [ 38.766083] 1 lock held by syzkaller666532/4155: [ 38.770823] #0: (rcu_read_lock){....}, at: [<000000004e6d2b6a>] __rds_conn_create+0xe46/0x1b50 [ 38.779766] CPU: 1 PID: 4155 Comm: syzkaller666532 Not tainted 4.16.0-rc1+ #309 [ 38.787183] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.796505] Call Trace: [ 38.799068] dump_stack+0x194/0x257 [ 38.802670] ? arch_local_irq_restore+0x53/0x53 [ 38.807312] ? print_lock+0x9f/0xa2 [ 38.810910] ? lockdep_print_held_locks+0xc4/0x130 [ 38.815815] ___might_sleep+0x2b2/0x470 [ 38.819759] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 38.825613] ? debug_mutex_init+0x1c/0x60 [ 38.829732] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.834724] __might_sleep+0x95/0x190 [ 38.838527] kmem_cache_alloc+0x2a2/0x760 [ 38.842991] ? lock_acquire+0x1d5/0x580 [ 38.846942] ? __rds_conn_create+0xe46/0x1b50 [ 38.851407] ? SyS_membarrier+0x700/0x700 [ 38.855530] ? init_timer_key+0x163/0x3f0 [ 38.859650] rds_tcp_conn_alloc+0xa7/0x4e0 [ 38.863858] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 38.868237] ? rds_cmsg_atomic+0xff0/0xff0 [ 38.872442] ? __lockdep_init_map+0xe4/0x650 [ 38.876822] ? rds_cmsg_atomic+0xff0/0xff0 [ 38.881027] __rds_conn_create+0x112f/0x1b50 [ 38.885427] ? rds_conn_drop+0xb0/0xb0 [ 38.889297] ? __raw_spin_lock_init+0x1c/0x100 [ 38.893850] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.898840] ? __lockdep_init_map+0xe4/0x650 [ 38.903223] ? lockdep_init_map+0x9/0x10 [ 38.907253] ? __init_waitqueue_head+0x97/0x140 [ 38.911893] ? init_wait_entry+0x1b0/0x1b0 [ 38.916117] ? lockdep_init_map+0x9/0x10 [ 38.920155] ? rds_message_alloc+0x28c/0x330 [ 38.924531] ? rds_message_next_extension+0x210/0x210 [ 38.929689] ? trace_hardirqs_on+0xd/0x10 [ 38.933810] ? _raw_spin_unlock_bh+0x30/0x40 [ 38.938192] ? __release_sock+0x360/0x360 [ 38.942312] ? lock_sock_nested+0x91/0x110 [ 38.946527] rds_conn_create_outgoing+0x3f/0x50 [ 38.951170] rds_sendmsg+0xda3/0x2390 [ 38.954939] ? avc_has_perm+0x43e/0x680 [ 38.958896] ? rds_send_drop_to+0x19d0/0x19d0 [ 38.963361] ? release_sock+0x1d4/0x2a0 [ 38.967316] ? lock_downgrade+0x980/0x980 [ 38.971437] ? find_held_lock+0x35/0x1d0 [ 38.975477] ? sock_has_perm+0x2a4/0x420 [ 38.979509] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 38.984844] ? lock_release+0xa22/0xa40 [ 38.988787] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 38.994642] ? __check_object_size+0x8b/0x530 [ 38.999109] ? __handle_mm_fault+0x80e/0x3ce0 [ 39.003581] ? __might_sleep+0x95/0x190 [ 39.007530] ? selinux_socket_sendmsg+0x36/0x40 [ 39.012170] ? security_socket_sendmsg+0x89/0xb0 [ 39.016896] ? rds_send_drop_to+0x19d0/0x19d0 [ 39.021365] sock_sendmsg+0xca/0x110 [ 39.025050] SYSC_sendto+0x361/0x5c0 [ 39.028739] ? SYSC_connect+0x4a0/0x4a0 [ 39.032704] ? __do_page_fault+0x5f7/0xc90 [ 39.036928] ? lock_downgrade+0x980/0x980 [ 39.041056] ? handle_mm_fault+0x43b/0x970 [ 39.045278] ? up_read+0x1a/0x40 [ 39.048618] ? __do_page_fault+0x3d6/0xc90 [ 39.052829] ? mm_fault_error+0x2c0/0x2c0 [ 39.056947] ? kernel_write+0x120/0x120 [ 39.060897] SyS_sendto+0x40/0x50 [ 39.064329] ? SyS_getpeername+0x30/0x30 [ 39.068362] do_syscall_64+0x282/0x940 [ 39.072220] ? __do_page_fault+0xc90/0xc90 [ 39.076425] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 39.081153] ? syscall_return_slowpath+0x550/0x550 [ 39.086054] ? syscall_return_slowpath+0x2ac/0x550 [ 39.090956] ? prepare_exit_to_usermode+0x350/0x350 [ 39.095945] ? retint_user+0x18/0x18 [ 39.099644] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.104464] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 39.109624] RIP: 0033:0x444f09 [ 39.112783] RSP: 002b:00007ffe01ae99c8 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 39.120459] RAX: ffffffffffffffda RBX: 00000000004a682b RCX: 0000000000444f09 [ 39.127701] RDX: 0000000000000000 RSI: 0000000020a3cfff RDI: 0000000000000004 [ 39.134943] RBP: 00007ffe01ae9a78 R08: 0000000020dfcff0 R09: 0000000000000010 [ 39.142183] R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffe01ae9a78 [ 39.149423] R13: 0000000000402490 R14: 0000000000000000 R15: 0000000000000000