[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.485544][ T25] audit: type=1800 audit(1570888299.506:25): pid=7067 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.527605][ T25] audit: type=1800 audit(1570888299.506:26): pid=7067 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.551124][ T25] audit: type=1800 audit(1570888299.506:27): pid=7067 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. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. 2019/10/12 13:51:50 fuzzer started 2019/10/12 13:51:52 dialing manager at 10.128.0.105:43913 2019/10/12 13:51:52 syscalls: 2523 2019/10/12 13:51:52 code coverage: enabled 2019/10/12 13:51:52 comparison tracing: enabled 2019/10/12 13:51:52 extra coverage: extra coverage is not supported by the kernel 2019/10/12 13:51:52 setuid sandbox: enabled 2019/10/12 13:51:52 namespace sandbox: enabled 2019/10/12 13:51:52 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 13:51:52 fault injection: enabled 2019/10/12 13:51:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 13:51:52 net packet injection: enabled 2019/10/12 13:51:52 net device setup: enabled 2019/10/12 13:51:52 concurrency sanitizer: enabled syzkaller login: [ 48.293608][ T0] ================================================================== [ 48.301886][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 48.310068][ T0] [ 48.312379][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 48.319993][ T0] tick_sched_do_timer+0xc0/0xe0 [ 48.324911][ T0] tick_sched_timer+0x43/0xe0 [ 48.329614][ T0] __hrtimer_run_queues+0x288/0x600 [ 48.334794][ T0] hrtimer_interrupt+0x22a/0x480 [ 48.339721][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 48.345159][ T0] apic_timer_interrupt+0xf/0x20 [ 48.350086][ T0] [ 48.352464][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 48.359764][ T0] tick_nohz_next_event+0x1a4/0x380 [ 48.364945][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 48.370471][ T0] do_idle+0x1e0/0x2c0 [ 48.374583][ T0] cpu_startup_entry+0x1b/0x20 [ 48.379391][ T0] start_secondary+0x207/0x260 [ 48.384151][ T0] secondary_startup_64+0xa4/0xb0 [ 48.389167][ T0] [ 48.391472][ T0] Reported by Kernel Concurrency Sanitizer on: [ 48.397630][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 48.404371][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.414419][ T0] ================================================================== [ 48.422454][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 48.429031][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 48.435765][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.445796][ T0] Call Trace: [ 48.449068][ T0] dump_stack+0xf5/0x159 [ 48.453308][ T0] panic+0x209/0x639 [ 48.457200][ T0] ? vprintk_func+0x8d/0x140 [ 48.461770][ T0] kcsan_report.cold+0xc/0x1b [ 48.466442][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.471967][ T0] __tsan_read4+0x2c/0x30 [ 48.476280][ T0] tick_nohz_next_event+0x1a4/0x380 [ 48.481471][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 48.486997][ T0] ? __tsan_read4+0x2c/0x30 [ 48.491482][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.497718][ T0] do_idle+0x1e0/0x2c0 [ 48.501779][ T0] ? complete+0x44/0x50 [ 48.505914][ T0] cpu_startup_entry+0x1b/0x20 [ 48.510680][ T0] start_secondary+0x207/0x260 [ 48.515437][ T0] secondary_startup_64+0xa4/0xb0 [ 48.521859][ T0] Kernel Offset: disabled [ 48.526188][ T0] Rebooting in 86400 seconds..