[....] Starting enhanced syslogd: rsyslogd[ 15.497108] audit: type=1400 audit(1518307358.654:5): avc: denied { syslog } for pid=3976 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: [ 19.436040] audit: type=1400 audit(1518307362.593:6): avc: denied { map } for pid=4116 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 '10.128.0.29' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 [ 25.744199] audit: type=1400 audit(1518307368.902:7): avc: denied { map } for pid=4130 comm="syzkaller119410" path="/root/syzkaller119410046" 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 [ 25.861240] ip (4151) used greatest stack depth: 16256 bytes left RTNETLINK answers: Operation not supported RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported [ 26.131908] 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 [ 26.463041] [ 26.464755] ============================= [ 26.468907] WARNING: suspicious RCU usage [ 26.473064] 4.15.0+ #222 Not tainted [ 26.476780] ----------------------------- [ 26.480933] ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! [ 26.490213] [ 26.490213] other info that might help us debug this: [ 26.490213] [ 26.498363] [ 26.498363] rcu_scheduler_active = 2, debug_locks = 1 [ 26.505040] 1 lock held by syzkaller119410/4130: [ 26.509788] #0: (rcu_read_lock){....}, at: [<0000000033e7ef96>] __rds_conn_create+0xe46/0x1b50 [ 26.518736] [ 26.518736] stack backtrace: [ 26.523238] CPU: 1 PID: 4130 Comm: syzkaller119410 Not tainted 4.15.0+ #222 [ 26.530310] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.539644] Call Trace: [ 26.542213] dump_stack+0x194/0x257 [ 26.545820] ? arch_local_irq_restore+0x53/0x53 [ 26.550476] lockdep_rcu_suspicious+0x123/0x170 [ 26.555125] ___might_sleep+0x385/0x470 [ 26.559073] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.564932] ? debug_mutex_init+0x1c/0x60 [ 26.569058] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.574064] __might_sleep+0x95/0x190 [ 26.577849] kmem_cache_alloc+0x2a2/0x760 [ 26.582023] ? lock_acquire+0x1d5/0x580 [ 26.585984] ? __rds_conn_create+0xe46/0x1b50 [ 26.590457] ? SyS_membarrier+0x700/0x700 [ 26.594580] ? init_timer_key+0x163/0x3f0 [ 26.598718] rds_tcp_conn_alloc+0xa7/0x4e0 [ 26.602931] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 26.607315] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.611532] ? __lockdep_init_map+0xe4/0x650 [ 26.615917] ? rds_cmsg_atomic+0xff0/0xff0 [ 26.620131] __rds_conn_create+0x112f/0x1b50 [ 26.624533] ? rds_conn_drop+0xb0/0xb0 [ 26.628399] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.633392] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.638126] ? __raw_spin_lock_init+0x1c/0x100 [ 26.642684] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.647680] ? __lockdep_init_map+0xe4/0x650 [ 26.652067] ? lockdep_init_map+0x9/0x10 [ 26.656104] ? __init_waitqueue_head+0x97/0x140 [ 26.660749] ? init_wait_entry+0x1b0/0x1b0 [ 26.664961] ? lockdep_init_map+0x9/0x10 [ 26.669004] ? rds_message_alloc+0x28c/0x330 [ 26.673396] ? rds_message_next_extension+0x210/0x210 [ 26.678568] ? rds_rdma_extra_size+0x205/0x2b0 [ 26.683130] ? rds_atomic_free_op+0x330/0x330 [ 26.687614] ? lock_sock_nested+0x91/0x110 [ 26.691828] rds_conn_create_outgoing+0x3f/0x50 [ 26.696474] rds_sendmsg+0xda3/0x2390 [ 26.700267] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.704752] ? find_held_lock+0x35/0x1d0 [ 26.708795] ? sock_has_perm+0x2a4/0x420 [ 26.712833] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 26.718170] ? lock_downgrade+0x980/0x980 [ 26.722296] ? lock_release+0xa40/0xa40 [ 26.726257] ? selinux_socket_sendmsg+0x36/0x40 [ 26.730901] ? security_socket_sendmsg+0x89/0xb0 [ 26.735635] ? rds_send_drop_to+0x19d0/0x19d0 [ 26.740106] sock_sendmsg+0xca/0x110 [ 26.743795] ___sys_sendmsg+0x767/0x8b0 [ 26.747749] ? copy_msghdr_from_user+0x590/0x590 [ 26.752482] ? up_read+0x1a/0x40 [ 26.755823] ? rds_trans_get_preferred+0xfb/0x130 [ 26.760642] ? rds_bind+0x3bd/0xc00 [ 26.764253] ? __fget_light+0x2b2/0x3c0 [ 26.768202] ? fget_raw+0x20/0x20 [ 26.771667] __sys_sendmsg+0xe5/0x210 [ 26.775441] ? __sys_sendmsg+0xe5/0x210 [ 26.779392] ? SyS_shutdown+0x290/0x290 [ 26.783350] ? __do_page_fault+0x3d6/0xc90 [ 26.787572] ? move_addr_to_kernel+0x60/0x60 [ 26.791960] SyS_sendmsg+0x2d/0x50 [ 26.795475] ? __sys_sendmsg+0x210/0x210 [ 26.799511] do_syscall_64+0x282/0x940 [ 26.803373] ? __do_page_fault+0xc90/0xc90 [ 26.807581] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.812312] ? syscall_return_slowpath+0x550/0x550 [ 26.817219] ? syscall_return_slowpath+0x2ac/0x550 [ 26.822122] ? prepare_exit_to_usermode+0x350/0x350 [ 26.827118] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 26.832459] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.837284] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 26.842446] RIP: 0033:0x4452b9 [ 26.845609] RSP: 002b:00007ffda4754518 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 26.853292] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004452b9 [ 26.860536] RDX: 0000000000000000 RSI: 0000000020006fc8 RDI: 0000000000000004 [ 26.867790] RBP: 00007ffda4754638 R08: 0000000000000000 R09: 0000000000000000 [ 26.875047] R10: 0000000000000000 R11: 0000000000000217 R12: 00007ffda4754638 [ 26.882296] R13: 0000000000402780 R14: 0000000000000000 R15: 0000000000000000 [ 26.889927] BUG: sleeping function called from invalid context at mm/slab.h:420 [ 26.897382] in_atomic(): 1, irqs_disabled(): 0, pid: 4130, name: syzkaller119410 [ 26.904938] 1 lock held by syzkaller119410/4130: [ 26.909689] #0: (rcu_read_lock){....}, at: [<0000000033e7ef96>] __rds_conn_create+0xe46/0x1b50 [ 26.918641] CPU: 1 PID: 4130 Comm: syzkaller119410 Not tainted 4.15.0+ #222 [ 26.925719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.935048] Call Trace: [ 26.937612] dump_stack+0x194/0x257 [ 26.941217] ? arch_local_irq_restore+0x53/0x53 [ 26.945863] ? print_lock+0x9f/0xa2 [ 26.949465] ? lockdep_print_held_locks+0xc4/0x130 [ 26.954374] ___might_sleep+0x2b2/0x470 [ 26.958325] ? trace_event_raw_event_sched_switch+0x810/0x810 [ 26.964181] ? debug_mutex_init+0x1c/0x60 [ 26.968305] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.973312] __might_sleep+0x95/0x190 [ 26.977102] kmem_cache_alloc+0x2a2/0x760 [ 26.981225] ? lock_acquire+0x1d5/0x580 [ 26.985173] ? __rds_conn_create+0xe46/0x1b50 [ 26.989645] ? SyS_membarrier+0x700/0x700 [ 26.993767] ? init_timer_key+0x163/0x3f0 [ 26.997892] rds_tcp_conn_alloc+0xa7/0x4e0 [ 27.002105] ? rds_tcp_conn_free+0x2d0/0x2d0 [ 27.006488] ? rds_cmsg_atomic+0xff0/0xff0 [ 27.010699] ? __lockdep_init_map+0xe4/0x650 [ 27.015082] ? rds_cmsg_atomic+0xff0/0xff0 [ 27.019296] __rds_conn_create+0x112f/0x1b50 [ 27.023700] ? rds_conn_drop+0xb0/0xb0 [ 27.027565] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.032556] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.037290] ? __raw_spin_lock_init+0x1c/0x100 [ 27.041847] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.046842] ? __lockdep_init_map+0xe4/0x650 [ 27.051227] ? lockdep_init_map+0x9/0x10 [ 27.055262] ? __init_waitqueue_head+0x97/0x140 [ 27.059905] ? init_wait_entry+0x1b0/0x1b0 [ 27.064119] ? lockdep_init_map+0x9/0x10 [ 27.068158] ? rds_message_alloc+0x28c/0x330 [ 27.072543] ? rds_message_next_extension+0x210/0x210 [ 27.077711] ? rds_rdma_extra_size+0x205/0x2b0 [ 27.082271] ? rds_atomic_free_op+0x330/0x330 [ 27.086739] ? lock_sock_nested+0x91/0x110 [ 27.090953] rds_conn_create_outgoing+0x3f/0x50 [ 27.095600] rds_sendmsg+0xda3/0x2390 [ 27.099392] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.103876] ? find_held_lock+0x35/0x1d0 [ 27.107927] ? sock_has_perm+0x2a4/0x420 [ 27.111962] ? selinux_secmark_relabel_packet+0xc0/0xc0 [ 27.117298] ? lock_downgrade+0x980/0x980 [ 27.121423] ? lock_release+0xa40/0xa40 [ 27.125385] ? selinux_socket_sendmsg+0x36/0x40 [ 27.130035] ? security_socket_sendmsg+0x89/0xb0 [ 27.134774] ? rds_send_drop_to+0x19d0/0x19d0 [ 27.139244] sock_sendmsg+0xca/0x110 [ 27.142935] ___sys_sendmsg+0x767/0x8b0 [ 27.146887] ? copy_msghdr_from_user+0x590/0x590 [ 27.151615] ? up_read+0x1a/0x40 [ 27.154958] ? rds_trans_get_preferred+0xfb/0x130 [ 27.159777] ? rds_bind+0x3bd/0xc00 [ 27.163387] ? __fget_light+0x2b2/0x3c0 [ 27.167338] ? fget_raw+0x20/0x20 [ 27.170794] __sys_sendmsg+0xe5/0x210 [ 27.174568] ? __sys_sendmsg+0xe5/0x210 [ 27.178520] ? SyS_shutdown+0x290/0x290 [ 27.182480] ? __do_page_fault+0x3d6/0xc90 [ 27.186700] ? move_addr_to_kernel+0x60/0x60 [ 27.191090] SyS_sendmsg+0x2d/0x50 [ 27.194608] ? __sys_sendmsg+0x210/0x210 [ 27.198645] do_syscall_64+0x282/0x940 [ 27.202507] ? __do_page_fault+0xc90/0xc90 [ 27.206719] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.211448] ? syscall_return_slowpath+0x550/0x550 [ 27.216353] ? syscall_return_slowpath+0x2ac/0x550 [ 27.221257] ? prepare_exit_to_usermode+0x350/0x350 [ 27.226249] ? entry_SYSCALL_64_after_hwframe+0x36/0x9b [ 27.231591] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.236412] entry_SYSCALL_64_after_hwframe+0x26/0x9b [ 27.241574] RIP: 0033:0x4452b9 [ 27.244739] RSP: 002b:00007ffda4754518 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 27.252421] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 00000000004452b9 [ 27.259673] RDX: 0000000000000000 RSI: 0000000020006fc8 RDI: 0000000000000004