[ 34.008354][ T25] audit: type=1800 audit(1570586090.369:25): pid=7102 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.028136][ T25] audit: type=1800 audit(1570586090.369:26): pid=7102 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.049862][ T25] audit: type=1800 audit(1570586090.369:27): pid=7102 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 34.467086][ T7166] sshd (7166) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.235' (ECDSA) to the list of known hosts. 2019/10/09 01:54:57 fuzzer started 2019/10/09 01:54:58 dialing manager at 10.128.0.105:35069 2019/10/09 01:54:58 syscalls: 2523 2019/10/09 01:54:58 code coverage: enabled 2019/10/09 01:54:58 comparison tracing: enabled 2019/10/09 01:54:58 extra coverage: extra coverage is not supported by the kernel 2019/10/09 01:54:58 setuid sandbox: enabled 2019/10/09 01:54:58 namespace sandbox: enabled 2019/10/09 01:54:58 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/09 01:54:58 fault injection: enabled 2019/10/09 01:54:58 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/09 01:54:58 net packet injection: enabled 2019/10/09 01:54:58 net device setup: enabled 2019/10/09 01:54:58 concurrency sanitizer: enabled syzkaller login: [ 42.796752][ T0] ================================================================== [ 42.804908][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 42.813405][ T0] [ 42.815749][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 42.823389][ T0] tick_sched_do_timer+0xc0/0xe0 [ 42.828332][ T0] tick_sched_timer+0x43/0xe0 [ 42.833018][ T0] __hrtimer_run_queues+0x288/0x600 [ 42.838223][ T0] hrtimer_interrupt+0x22a/0x480 [ 42.843158][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 42.848612][ T0] apic_timer_interrupt+0xf/0x20 [ 42.853526][ T0] [ 42.855850][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 42.863131][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 42.868663][ T0] do_idle+0x1e0/0x2c0 [ 42.872707][ T0] cpu_startup_entry+0x1b/0x20 [ 42.877448][ T0] start_secondary+0x207/0x260 [ 42.882203][ T0] secondary_startup_64+0xa4/0xb0 [ 42.887202][ T0] [ 42.889553][ T0] Reported by Kernel Concurrency Sanitizer on: [ 42.895707][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 42.902459][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.912504][ T0] ================================================================== [ 42.920555][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 42.927145][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 42.933916][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.943962][ T0] Call Trace: [ 42.947252][ T0] dump_stack+0xf5/0x159 [ 42.951499][ T0] panic+0x209/0x639 [ 42.955399][ T0] ? vprintk_func+0x8d/0x140 [ 42.959987][ T0] kcsan_report.cold+0xc/0x1b [ 42.964649][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 42.970189][ T0] __tsan_read4+0x2c/0x30 [ 42.974510][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 42.980059][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.986298][ T0] do_idle+0x1e0/0x2c0 [ 42.990378][ T0] ? complete+0x44/0x50 [ 42.994539][ T0] cpu_startup_entry+0x1b/0x20 [ 42.999287][ T0] start_secondary+0x207/0x260 [ 43.004044][ T0] secondary_startup_64+0xa4/0xb0 [ 43.010477][ T0] Kernel Offset: disabled [ 43.014798][ T0] Rebooting in 86400 seconds..