[....] Starting enhanced syslogd: rsyslogd[ 15.115780] audit: type=1400 audit(1518387887.385:5): avc: denied { syslog } for pid=3929 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: [ 19.093371] audit: type=1400 audit(1518387891.363:6): avc: denied { map } for pid=4069 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 '10.128.0.19' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 25.396636] audit: type=1400 audit(1518387897.666:7): avc: denied { map } for pid=4083 comm="syzkaller207706" path="/root/syzkaller207706135" 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 [ 25.778476] 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 [ 26.112441] [ 26.114142] ============================= [ 26.118298] WARNING: suspicious RCU usage [ 26.122446] 4.15.0+ #308 Not tainted [ 26.126164] ----------------------------- [ 26.130341] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 26.139641] [ 26.139641] other info that might help us debug this: [ 26.139641] [ 26.147802] [ 26.147802] rcu_scheduler_active = 2, debug_locks = 1 [ 26.154492] 1 lock held by syzkaller207706/4083: [ 26.159268] #0: (rcu_read_lock){....}, at: [<0000000069fad00f>] __rds_conn_create+0xe46/0x1b50 [ 26.168232] [ 26.168232] stack backtrace: [ 26.172743] CPU: 1 PID: 4083 Comm: syzkaller207706 Not tainted 4.15.0+ #308 [ 26.179815] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.189141] Call Trace: [ 26.191703] dump_stack+0x194/0x257 [ 26.195306] ? arch_local_irq_restore+0x53/0x53 [ 26.199960] lockdep_rcu_suspicious+0x123/0x170 [ 26.204604] ___might_sleep+0x385/0x470 [ 26.208639] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.214497] ? debug_mutex_init+0x1c/0x60 [ 26.218618] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.223618] __might_sleep+0x95/0x190 [ 26.227398] kmem_cache_alloc+0x2a2/0x760 [ 26.231520] ? lock_acquire+0x1d5/0x580 [ 26.235467] ? __rds_conn_create+0xe46/0x1b50 [ 26.239939] ? SyS_membarrier+0x700/0x700 [ 26.244061] ? init_timer_key+0x163/0x3f0 [ 26.248185] rds_tcp_conn_alloc+0xa7/0x4e0 [ 26.252398] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 26.256779] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.261010] ? __lockdep_init_map+0xe4/0x650 [ 26.265395] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.269606] __rds_conn_create+0x112f/0x1b50 [ 26.274011] ? rds_conn_drop+0xb0/0xb0 [ 26.277879] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.282874] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.287616] ? __raw_spin_lock_init+0x1c/0x100 [ 26.292174] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.297169] ? __lockdep_init_map+0xe4/0x650 [ 26.301554] ? lockdep_init_map+0x9/0x10 [ 26.305587] ? __init_waitqueue_head+0x97/0x140 [ 26.310234] ? init_wait_entry+0x1b0/0x1b0 [ 26.314449] ? lockdep_init_map+0x9/0x10 [ 26.318492] ? rds_message_alloc+0x28c/0x330 [ 26.322882] ? rds_message_next_extension+0x210/0x210 [ 26.328050] ? rds_rdma_extra_size+0x205/0x2b0 [ 26.332617] ? rds_atomic_free_op+0x330/0x330 [ 26.337090] ? lock_sock_nested+0x91/0x110 [ 26.341308] rds_conn_create_outgoing+0x3f/0x50 [ 26.345955] rds_sendmsg+0xda3/0x2390 [ 26.349745] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.354229] ? find_held_lock+0x35/0x1d0 [ 26.358268] ? sock_has_perm+0x2a4/0x420 [ 26.362305] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.367641] ? lock_downgrade+0x980/0x980 [ 26.371765] ? lock_release+0xa40/0xa40 [ 26.375724] ? selinux_socket_sendmsg+0x36/0x40 [ 26.380364] ? security_socket_sendmsg+0x89/0xb0 [ 26.385092] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.389560] sock_sendmsg+0xca/0x110 [ 26.393250] ___sys_sendmsg+0x767/0x8b0 [ 26.397200] ? copy_msghdr_from_user+0x590/0x590 [ 26.401930] ? up_read+0x1a/0x40 [ 26.405270] ? rds_trans_get_preferred+0xfb/0x130 [ 26.410091] ? rds_bind+0x3bd/0xc00 [ 26.413699] ? __fget_light+0x2b2/0x3c0 [ 26.417649] ? fget_raw+0x20/0x20 [ 26.421111] __sys_sendmsg+0xe5/0x210 [ 26.424895] ? __sys_sendmsg+0xe5/0x210 [ 26.428844] ? SyS_shutdown+0x290/0x290 [ 26.432805] ? __do_page_fault+0x3d6/0xc90 [ 26.437034] ? move_addr_to_kernel+0x60/0x60 [ 26.441432] SyS_sendmsg+0x2d/0x50 [ 26.444956] ? __sys_sendmsg+0x210/0x210 [ 26.448998] do_syscall_64+0x282/0x940 [ 26.452862] ? __do_page_fault+0xc90/0xc90 [ 26.457071] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.461804] ? syscall_return_slowpath+0x550/0x550 [ 26.466708] ? syscall_return_slowpath+0x2ac/0x550 [ 26.471612] ? prepare_exit_to_usermode+0x350/0x350 [ 26.476604] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 26.481959] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.486793] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.491958] RIP: 0033:0x4452b9 [ 26.495127] RSP: 002b:00007ffc02fa97d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.502806] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004452b9 [ 26.510050] RDX: 0000000000000000 RSI: 0000000020006fc8 RDI: 0000000000000004 [ 26.517294] RBP: 00007ffc02fa98f8 R08: 0000000000000000 R09: 0000000000000000 [ 26.524545] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffc02fa98f8 [ 26.531787] R13: 0000000000402780 R14: 0000000000000000 R15: 0000000000000000 [ 26.539448] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.546915] in_atomic(): 1, irqs_disabled(): 0, pid: 4083, name: syzkaller207706 [ 26.554466] 1 lock held by syzkaller207706/4083: [ 26.559226] #0: (rcu_read_lock){....}, at: [<0000000069fad00f>] __rds_conn_create+0xe46/0x1b50 [ 26.568184] CPU: 1 PID: 4083 Comm: syzkaller207706 Not tainted 4.15.0+ #308 [ 26.575268] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.584605] Call Trace: [ 26.587172] dump_stack+0x194/0x257 [ 26.590778] ? arch_local_irq_restore+0x53/0x53 [ 26.595433] ? print_lock+0x9f/0xa2 [ 26.599039] ? lockdep_print_held_locks+0xc4/0x130 [ 26.603948] ___might_sleep+0x2b2/0x470 [ 26.607896] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.613753] ? debug_mutex_init+0x1c/0x60 [ 26.617875] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.622869] __might_sleep+0x95/0x190 [ 26.626646] kmem_cache_alloc+0x2a2/0x760 [ 26.630767] ? lock_acquire+0x1d5/0x580 [ 26.634715] ? __rds_conn_create+0xe46/0x1b50 [ 26.639186] ? SyS_membarrier+0x700/0x700 [ 26.643324] ? init_timer_key+0x163/0x3f0 [ 26.647451] rds_tcp_conn_alloc+0xa7/0x4e0 [ 26.651664] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 26.656045] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.660257] ? __lockdep_init_map+0xe4/0x650 [ 26.664640] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.668851] __rds_conn_create+0x112f/0x1b50 [ 26.673251] ? rds_conn_drop+0xb0/0xb0 [ 26.677113] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.682123] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.686863] ? __raw_spin_lock_init+0x1c/0x100 [ 26.691421] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.696421] ? __lockdep_init_map+0xe4/0x650 [ 26.700809] ? lockdep_init_map+0x9/0x10 [ 26.704845] ? __init_waitqueue_head+0x97/0x140 [ 26.709489] ? init_wait_entry+0x1b0/0x1b0 [ 26.713712] ? lockdep_init_map+0x9/0x10 [ 26.717755] ? rds_message_alloc+0x28c/0x330 [ 26.722136] ? rds_message_next_extension+0x210/0x210 [ 26.727301] ? rds_rdma_extra_size+0x205/0x2b0 [ 26.731865] ? rds_atomic_free_op+0x330/0x330 [ 26.736337] ? lock_sock_nested+0x91/0x110 [ 26.740550] rds_conn_create_outgoing+0x3f/0x50 [ 26.745198] rds_sendmsg+0xda3/0x2390 [ 26.748989] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.753476] ? find_held_lock+0x35/0x1d0 [ 26.757515] ? sock_has_perm+0x2a4/0x420 [ 26.761551] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.766886] ? lock_downgrade+0x980/0x980 [ 26.771019] ? lock_release+0xa40/0xa40 [ 26.774984] ? selinux_socket_sendmsg+0x36/0x40 [ 26.779630] ? security_socket_sendmsg+0x89/0xb0 [ 26.784360] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.788832] sock_sendmsg+0xca/0x110 [ 26.792522] ___sys_sendmsg+0x767/0x8b0 [ 26.796473] ? copy_msghdr_from_user+0x590/0x590 [ 26.801208] ? up_read+0x1a/0x40 [ 26.804549] ? rds_trans_get_preferred+0xfb/0x130 [ 26.809366] ? rds_bind+0x3bd/0xc00 [ 26.812974] ? __fget_light+0x2b2/0x3c0 [ 26.816926] ? fget_raw+0x20/0x20 [ 26.820382] __sys_sendmsg+0xe5/0x210 [ 26.824158] ? __sys_sendmsg+0xe5/0x210 [ 26.828110] ? SyS_shutdown+0x290/0x290 [ 26.832067] ? __do_page_fault+0x3d6/0xc90 [ 26.836286] ? move_addr_to_kernel+0x60/0x60 [ 26.840683] SyS_sendmsg+0x2d/0x50 [ 26.844204] ? __sys_sendmsg+0x210/0x210 [ 26.848241] do_syscall_64+0x282/0x940 [ 26.852103] ? __do_page_fault+0xc90/0xc90 [ 26.856310] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.861057] ? syscall_return_slowpath+0x550/0x550 [ 26.865963] ? syscall_return_slowpath+0x2ac/0x550 [ 26.870873] ? prepare_exit_to_usermode+0x350/0x350 [ 26.875865] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 26.881206] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.886036] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.891199] RIP: 0033:0x4452b9 [ 26.894362] RSP: 002b:00007ffc02fa97d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.902045] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004452b9 [ 26.909294] RDX: 0000000000000000 RSI: 0000000020006fc8 RDI: 000000000000000