[....] Starting enhanced syslogd: rsyslogd[ 14.275655] audit: type=1400 audit(1518390612.064:5): avc: denied { syslog } for pid=3910 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: [ 18.327198] audit: type=1400 audit(1518390616.116:6): avc: denied { map } for pid=4050 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 '10.128.0.13' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 24.743261] audit: type=1400 audit(1518390622.531:7): avc: denied { map } for pid=4064 comm="syzkaller729276" path="/root/syzkaller729276636" 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 [ 25.113322] IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument RTNETLINK answers: Invalid argument executing program [ 25.441752] [ 25.443435] ============================= [ 25.447686] WARNING: suspicious RCU usage [ 25.451840] 4.15.0+ #308 Not tainted [ 25.455555] ----------------------------- [ 25.459704] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 25.468977] [ 25.468977] other info that might help us debug this: [ 25.468977] [ 25.477156] [ 25.477156] rcu_scheduler_active = 2, debug_locks = 1 [ 25.483835] 1 lock held by syzkaller729276/4064: [ 25.488598] #0: (rcu_read_lock){....}, at: [<00000000a9cd4e24>] __rds_conn_create+0xe46/0x1b50 [ 25.497550] [ 25.497550] stack backtrace: [ 25.502057] CPU: 0 PID: 4064 Comm: syzkaller729276 Not tainted 4.15.0+ #308 [ 25.509129] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.518455] Call Trace: [ 25.521025] dump_stack+0x194/0x257 [ 25.524632] ? arch_local_irq_restore+0x53/0x53 [ 25.529288] lockdep_rcu_suspicious+0x123/0x170 [ 25.533933] ___might_sleep+0x385/0x470 [ 25.537880] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.543735] ? debug_mutex_init+0x1c/0x60 [ 25.547856] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.552848] __might_sleep+0x95/0x190 [ 25.556625] kmem_cache_alloc+0x2a2/0x760 [ 25.560745] ? lock_acquire+0x1d5/0x580 [ 25.564696] ? __rds_conn_create+0xe46/0x1b50 [ 25.569166] ? SyS_membarrier+0x700/0x700 [ 25.573285] ? init_timer_key+0x163/0x3f0 [ 25.577411] rds_tcp_conn_alloc+0xa7/0x4e0 [ 25.581620] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 25.585999] ? rds_cmsg_atomic+0xff0/0xff0 [ 25.590215] ? __lockdep_init_map+0xe4/0x650 [ 25.594593] ? rds_cmsg_atomic+0xff0/0xff0 [ 25.598802] __rds_conn_create+0x112f/0x1b50 [ 25.603199] ? rds_conn_drop+0xb0/0xb0 [ 25.607069] ? __raw_spin_lock_init+0x1c/0x100 [ 25.611633] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.616626] ? __lockdep_init_map+0xe4/0x650 [ 25.621010] ? lockdep_init_map+0x9/0x10 [ 25.625064] ? __init_waitqueue_head+0x97/0x140 [ 25.629707] ? init_wait_entry+0x1b0/0x1b0 [ 25.633925] ? lockdep_init_map+0x9/0x10 [ 25.637965] ? rds_message_alloc+0x28c/0x330 [ 25.642348] ? rds_message_next_extension+0x210/0x210 [ 25.647512] ? trace_hardirqs_on+0xd/0x10 [ 25.651640] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.656035] ? __release_sock+0x360/0x360 [ 25.660153] ? lock_sock_nested+0x91/0x110 [ 25.664366] rds_conn_create_outgoing+0x3f/0x50 [ 25.669017] rds_sendmsg+0xda3/0x2390 [ 25.672794] ? avc_has_perm+0x43e/0x680 [ 25.676755] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.681237] ? release_sock+0x1d4/0x2a0 [ 25.685188] ? lock_downgrade+0x980/0x980 [ 25.689313] ? find_held_lock+0x35/0x1d0 [ 25.693361] ? sock_has_perm+0x2a4/0x420 [ 25.697399] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 25.702733] ? lock_release+0xa22/0xa40 [ 25.706677] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.712540] ? __check_object_size+0x8b/0x530 [ 25.717008] ? __handle_mm_fault+0x80e/0x3ce0 [ 25.721492] ? __might_sleep+0x95/0x190 [ 25.725445] ? selinux_socket_sendmsg+0x36/0x40 [ 25.730086] ? security_socket_sendmsg+0x89/0xb0 [ 25.734817] ? rds_send_drop_to+0x19d0/0x19d0 [ 25.739289] sock_sendmsg+0xca/0x110 [ 25.742985] SYSC_sendto+0x361/0x5c0 [ 25.746675] ? SYSC_connect+0x4a0/0x4a0 [ 25.750629] ? __do_page_fault+0x5f7/0xc90 [ 25.754838] ? lock_downgrade+0x980/0x980 [ 25.758966] ? handle_mm_fault+0x43b/0x970 [ 25.763184] ? up_read+0x1a/0x40 [ 25.766524] ? __do_page_fault+0x3d6/0xc90 [ 25.770738] ? mm_fault_error+0x2c0/0x2c0 [ 25.774859] ? move_addr_to_kernel+0x60/0x60 [ 25.779250] SyS_sendto+0x40/0x50 [ 25.782676] ? SyS_getpeername+0x30/0x30 [ 25.786718] do_syscall_64+0x282/0x940 [ 25.790586] ? __do_page_fault+0xc90/0xc90 [ 25.794792] ? page_fault+0x36/0x60 [ 25.798389] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.803117] ? syscall_return_slowpath+0x550/0x550 [ 25.808019] ? retint_kernel+0x10/0x10 [ 25.811879] ? retint_user+0x18/0x18 [ 25.815578] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.820409] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 25.825573] RIP: 0033:0x445239 [ 25.828736] RSP: 002b:00007ffd1487c648 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 25.836414] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445239 [ 25.843666] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000004 [ 25.850908] RBP: 00007ffd1487c768 R08: 000000002069affb R09: 0000000000000010 [ 25.858152] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffd1487c768 [ 25.865392] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000 [ 25.872928] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 25.880382] in_atomic(): 1, irqs_disabled(): 0, pid: 4064, name: syzkaller729276 [ 25.887921] 1 lock held by syzkaller729276/4064: [ 25.892667] #0: (rcu_read_lock){....}, at: [<00000000a9cd4e24>] __rds_conn_create+0xe46/0x1b50 [ 25.901615] CPU: 0 PID: 4064 Comm: syzkaller729276 Not tainted 4.15.0+ #308 [ 25.908685] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.918012] Call Trace: [ 25.920575] dump_stack+0x194/0x257 [ 25.924177] ? arch_local_irq_restore+0x53/0x53 [ 25.928823] ? print_lock+0x9f/0xa2 [ 25.932430] ? lockdep_print_held_locks+0xc4/0x130 [ 25.937339] ___might_sleep+0x2b2/0x470 [ 25.941294] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 25.947147] ? debug_mutex_init+0x1c/0x60 [ 25.951270] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.956259] __might_sleep+0x95/0x190 [ 25.960035] kmem_cache_alloc+0x2a2/0x760 [ 25.964153] ? lock_acquire+0x1d5/0x580 [ 25.968096] ? __rds_conn_create+0xe46/0x1b50 [ 25.972570] ? SyS_membarrier+0x700/0x700 [ 25.976686] ? init_timer_key+0x163/0x3f0 [ 25.980806] rds_tcp_conn_alloc+0xa7/0x4e0 [ 25.985019] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 25.989396] ? rds_cmsg_atomic+0xff0/0xff0 [ 25.993603] ? __lockdep_init_map+0xe4/0x650 [ 25.997981] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.002190] __rds_conn_create+0x112f/0x1b50 [ 26.006585] ? rds_conn_drop+0xb0/0xb0 [ 26.010454] ? __raw_spin_lock_init+0x1c/0x100 [ 26.015007] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.019998] ? __lockdep_init_map+0xe4/0x650 [ 26.024379] ? lockdep_init_map+0x9/0x10 [ 26.028412] ? __init_waitqueue_head+0x97/0x140 [ 26.033051] ? init_wait_entry+0x1b0/0x1b0 [ 26.037262] ? lockdep_init_map+0x9/0x10 [ 26.041312] ? rds_message_alloc+0x28c/0x330 [ 26.045692] ? rds_message_next_extension+0x210/0x210 [ 26.050851] ? trace_hardirqs_on+0xd/0x10 [ 26.054972] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.059363] ? __release_sock+0x360/0x360 [ 26.063479] ? lock_sock_nested+0x91/0x110 [ 26.067689] rds_conn_create_outgoing+0x3f/0x50 [ 26.072333] rds_sendmsg+0xda3/0x2390 [ 26.076103] ? avc_has_perm+0x43e/0x680 [ 26.080063] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.084528] ? release_sock+0x1d4/0x2a0 [ 26.088480] ? lock_downgrade+0x980/0x980 [ 26.092605] ? find_held_lock+0x35/0x1d0 [ 26.096644] ? sock_has_perm+0x2a4/0x420 [ 26.100677] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.106011] ? lock_release+0xa22/0xa40 [ 26.109956] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.115810] ? __check_object_size+0x8b/0x530 [ 26.120278] ? __handle_mm_fault+0x80e/0x3ce0 [ 26.124767] ? __might_sleep+0x95/0x190 [ 26.128738] ? selinux_socket_sendmsg+0x36/0x40 [ 26.133382] ? security_socket_sendmsg+0x89/0xb0 [ 26.138112] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.142582] sock_sendmsg+0xca/0x110 [ 26.146272] SYSC_sendto+0x361/0x5c0 [ 26.149976] ? SYSC_connect+0x4a0/0x4a0 [ 26.153928] ? __do_page_fault+0x5f7/0xc90 [ 26.158138] ? lock_downgrade+0x980/0x980 [ 26.162264] ? handle_mm_fault+0x43b/0x970 [ 26.166484] ? up_read+0x1a/0x40 [ 26.169836] ? __do_page_fault+0x3d6/0xc90 [ 26.174050] ? mm_fault_error+0x2c0/0x2c0 [ 26.178170] ? move_addr_to_kernel+0x60/0x60 [ 26.182562] SyS_sendto+0x40/0x50 [ 26.185991] ? SyS_getpeername+0x30/0x30 [ 26.190026] do_syscall_64+0x282/0x940 [ 26.193886] ? __do_page_fault+0xc90/0xc90 [ 26.198092] ? page_fault+0x36/0x60 [ 26.201690] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.206418] ? syscall_return_slowpath+0x550/0x550 [ 26.211318] ? retint_kernel+0x10/0x10 [ 26.215266] ? retint_user+0x18/0x18 [ 26.218958] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.223779] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.228940] RIP: 0033:0x445239 [ 26.232102] RSP: 002b:00007ffd1487c648 EFLAGS: 00000217 ORIG_RAX: 000000000000002c [ 26.239782] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000445239 [ 26.247024] RDX: 0000000000000000 RSI: 0000000020fc2000 RDI: 0000000000000004 [ 26.254266] RBP: 00007ffd1487c768 R08: 000000002069affb R09: 0000000000000010 [ 26.261508] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffd1487c768 [ 26.268750] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000