[ 32.752658] sshd (6055) used greatest stack depth: 15736 bytes left [ 32.765710] restorecond (6077) used greatest stack depth: 15176 bytes left [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.049166] audit: type=1800 audit(1545620757.994:33): pid=5989 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 33.077965] audit: type=1800 audit(1545620757.994:34): pid=5989 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 37.295367] audit: type=1400 audit(1545620762.234:35): avc: denied { map } for pid=6166 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 '10.128.0.165' (ECDSA) to the list of known hosts. executing program [ 691.145614] audit: type=1400 audit(1545621416.084:36): avc: denied { map } for pid=6180 comm="syz-executor053" path="/root/syz-executor053760325" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 691.255359] hrtimer: interrupt took 35234 ns [ 696.528247] audit: type=1400 audit(1545621421.464:37): avc: denied { map } for pid=6182 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 831.025151] rcu: INFO: rcu_preempt self-detected stall on CPU [ 831.031316] rcu: 0-....: (13423 ticks this GP) idle=6c6/1/0x4000000000000002 softirq=7663/7665 fqs=5214 [ 831.041362] rcu: (t=10500 jiffies g=5229 q=6) [ 831.046020] NMI backtrace for cpu 0 [ 831.049974] CPU: 0 PID: 6180 Comm: syz-executor053 Not tainted 4.20.0-rc7+ #165 [ 831.057406] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 831.066805] Call Trace: [ 831.069397] [ 831.071718] dump_stack+0x1d3/0x2c6 [ 831.075451] ? dump_stack_print_info.cold.1+0x20/0x20 [ 831.080688] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.086553] ? do_raw_spin_lock+0x14f/0x350 [ 831.091021] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 831.096210] nmi_cpu_backtrace.cold.4+0x63/0xa2 [ 831.100878] ? lapic_can_unplug_cpu.cold.28+0x3f/0x3f [ 831.106059] nmi_trigger_cpumask_backtrace+0x1c2/0x22c [ 831.111519] arch_trigger_cpumask_backtrace+0x14/0x20 [ 831.116759] rcu_dump_cpu_stacks+0x16f/0x1bc [ 831.121184] print_cpu_stall.cold.65+0x1f3/0x3c6 [ 831.125978] ? rcu_dynticks_snap+0x30/0x30 [ 831.130246] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.135774] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.141335] ? do_trace_rcu_torture_read+0x10/0x10 [ 831.146263] ? rcu_preempt_need_deferred_qs+0x74/0x1f0 [ 831.151612] ? __lock_is_held+0xb5/0x140 [ 831.155672] ? __rcu_read_lock+0x50/0x50 [ 831.159726] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.165363] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.170941] ? check_preemption_disabled+0x48/0x280 [ 831.176057] rcu_check_callbacks+0xac1/0x1410 [ 831.180589] ? rcutree_dead_cpu+0x10/0x10 [ 831.184733] ? lock_downgrade+0x900/0x900 [ 831.188870] ? lock_release+0x960/0xa00 [ 831.192849] ? graph_lock+0x270/0x270 [ 831.196759] ? graph_lock+0x270/0x270 [ 831.200551] ? mark_held_locks+0x130/0x130 [ 831.204784] ? graph_lock+0x270/0x270 [ 831.208584] ? graph_lock+0x270/0x270 [ 831.212533] ? find_held_lock+0x36/0x1c0 [ 831.216587] ? cpuacct_account_field+0x219/0x3d0 [ 831.221329] ? graph_lock+0x270/0x270 [ 831.225114] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 831.230800] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.236332] ? check_preemption_disabled+0x48/0x280 [ 831.241381] ? trace_hardirqs_off+0xb8/0x310 [ 831.245786] ? __lock_is_held+0xb5/0x140 [ 831.249839] ? trace_hardirqs_on+0x310/0x310 [ 831.254235] ? check_preemption_disabled+0x48/0x280 [ 831.259269] ? raise_softirq+0x199/0x420 [ 831.263324] ? raise_softirq_irqoff+0x2e0/0x2e0 [ 831.268149] ? account_system_index_time+0x333/0x5d0 [ 831.273525] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.279121] ? check_preemption_disabled+0x48/0x280 [ 831.284136] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 831.289710] ? hrtimer_run_queues+0x9a/0x400 [ 831.294112] ? run_local_timers+0x19b/0x230 [ 831.298417] ? timer_clear_idle+0x90/0x90 [ 831.302646] ? irqtime_account_process_tick.isra.6+0x35b/0x490 [ 831.308754] ? account_process_tick+0x282/0x350 [ 831.313429] update_process_times+0x2d/0x70 [ 831.317817] tick_sched_handle+0x9f/0x180 [ 831.322147] tick_sched_timer+0x45/0x130 [ 831.326375] __hrtimer_run_queues+0x41c/0x10d0 [ 831.330952] ? tick_sched_do_timer+0x1a0/0x1a0 [ 831.335636] ? hrtimer_start_range_ns+0xe00/0xe00 [ 831.340500] ? pvclock_read_flags+0x160/0x160 [ 831.344986] ? trace_hardirqs_on+0x310/0x310 [ 831.349484] ? kvm_clock_read+0x18/0x30 [ 831.353444] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 831.358453] ? ktime_get_update_offsets_now+0x3b3/0x540 [ 831.363816] ? do_timer+0x50/0x50 [ 831.367261] ? rwlock_bug.part.2+0x90/0x90 [ 831.371537] ? trace_hardirqs_on+0x310/0x310 [ 831.375950] ? rcu_softirq_qs+0x20/0x20 [ 831.379934] hrtimer_interrupt+0x313/0x780 [ 831.384207] smp_apic_timer_interrupt+0x1a1/0x760 [ 831.389157] ? smp_reschedule_interrupt+0x109/0x650 [ 831.394208] ? smp_call_function_single_interrupt+0x650/0x650 [ 831.400136] ? interrupt_entry+0xb5/0xc0 [ 831.404343] ? trace_hardirqs_off_caller+0xbb/0x310 [ 831.409464] ? trace_hardirqs_off_caller+0xbb/0x310 [ 831.414617] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 831.419574] ? trace_hardirqs_on_caller+0x310/0x310 [ 831.424665] ? trace_hardirqs_on_caller+0x310/0x310 [ 831.429780] ? task_prio+0x50/0x50 [ 831.433315] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.438950] ? check_preemption_disabled+0x48/0x280 [ 831.444120] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 831.449057] apic_timer_interrupt+0xf/0x20 [ 831.453340] [ 831.455571] RIP: 0010:_raw_read_unlock_irq+0x56/0x80 [ 831.460657] Code: 52 89 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 32 48 83 3d 33 94 7a 01 00 74 1f fb 66 0f 1f 44 00 00 01 00 00 00 e8 d0 c2 7d f9 65 8b 05 69 80 2a 78 85 c0 74 05 5b [ 831.479751] RSP: 0018:ffff8881be89f660 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 831.487487] RAX: dffffc0000000000 RBX: ffffffff89e89e60 RCX: 1ffff11039b689cc [ 831.494755] RDX: 1ffffffff12a4030 RSI: 0000000000000000 RDI: ffffffff89520180 [ 831.502172] RBP: ffff8881be89f668 R08: ffff8881cdb44e60 R09: 0000000000000006 [ 831.509563] R10: 0000000000000000 R11: ffff8881cdb445c0 R12: 0000000000000001 [ 831.516815] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881be89f828 [ 831.524160] __snd_pcm_stream_unlock_mode+0x125/0x150 [ 831.529355] snd_pcm_delay+0x234/0x380 [ 831.533265] snd_pcm_kernel_ioctl+0x1e0/0x220 [ 831.537919] snd_pcm_oss_capture_position_fixup+0x1a1/0x250 [ 831.543643] ? snd_pcm_oss_prepare+0x150/0x150 [ 831.548326] ? find_held_lock+0x36/0x1c0 [ 831.552471] snd_pcm_oss_read3+0x181/0x410 [ 831.556806] ? snd_pcm_oss_write+0xa40/0xa40 [ 831.561218] ? mark_held_locks+0xc7/0x130 [ 831.565464] io_capture_transfer+0x27d/0x310 [ 831.569966] ? snd_pcm_plug_slave_size+0x1d0/0x350 [ 831.575054] snd_pcm_plug_read_transfer+0x1d7/0x3b0 [ 831.580065] ? snd_pcm_plug_write_transfer+0x490/0x490 [ 831.585334] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 831.590358] ? snd_pcm_plug_client_channels_buf+0x212/0x450 [ 831.596062] snd_pcm_oss_read2+0x221/0x450 [ 831.600317] ? snd_pcm_oss_read3+0x410/0x410 [ 831.604775] ? snd_pcm_oss_read+0x478/0x820 [ 831.609307] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 831.614872] snd_pcm_oss_read+0x4e4/0x820 [ 831.619145] ? snd_pcm_oss_read2+0x450/0x450 [ 831.623665] ? snd_pcm_oss_read2+0x450/0x450 [ 831.628220] __vfs_read+0x117/0x9b0 [ 831.631856] ? __fget_light+0x2e9/0x430 [ 831.635823] ? snd_pcm_oss_read2+0x450/0x450 [ 831.640286] ? vfs_copy_file_range+0xb90/0xb90 [ 831.644862] ? __might_sleep+0x95/0x190 [ 831.648878] ? fsnotify+0xef0/0xef0 [ 831.652497] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 831.657532] ? selinux_file_permission+0x90/0x540 [ 831.662396] ? security_file_permission+0x1c2/0x230 [ 831.667412] ? rw_verify_area+0x118/0x360 [ 831.671546] vfs_read+0x17f/0x3c0 [ 831.674981] ksys_read+0x101/0x260 [ 831.678633] ? kernel_write+0x120/0x120 [ 831.682727] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 831.688194] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 831.693765] ? ksys_ioctl+0x81/0xd0 [ 831.697380] __x64_sys_read+0x73/0xb0 [ 831.701183] do_syscall_64+0x1b9/0x820 [ 831.705063] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 831.710430] ? syscall_return_slowpath+0x5e0/0x5e0 [ 831.715343] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 831.720171] ? trace_hardirqs_on_caller+0x310/0x310 [ 831.725195] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 831.730195] ? prepare_exit_to_usermode+0x291/0x3b0 [ 831.735228] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 831.740065] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 831.745238] RIP: 0033:0x443ef9 [ 831.748413] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 831.767299] RSP: 002b:00007fffd155a428 EFLAGS: 00000217 ORIG_RAX: 0000000000000000 [ 831.774991] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443ef9 [ 831.782241] RDX: 0000000000000008 RSI: 0000000020000180 RDI: 0000000000000003 [ 831.789495] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 [ 831.796796] R10: 00000000004002e0 R11: 0000000000000217 R12: 0000000000401c00 [ 831.804060] R13: 0000000000401c90 R14: 0000000000000000 R15: 0000000000000000 [ 831.811869] sched: RT throttling activated