[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.316440][ T25] audit: type=1800 audit(1570859914.596:25): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.343697][ T25] audit: type=1800 audit(1570859914.606:26): pid=7091 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.373117][ T25] audit: type=1800 audit(1570859914.606:27): pid=7091 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 '10.128.0.123' (ECDSA) to the list of known hosts. 2019/10/12 05:58:41 fuzzer started 2019/10/12 05:58:43 dialing manager at 10.128.0.105:43913 2019/10/12 05:58:43 syscalls: 2523 2019/10/12 05:58:43 code coverage: enabled 2019/10/12 05:58:43 comparison tracing: enabled 2019/10/12 05:58:43 extra coverage: extra coverage is not supported by the kernel 2019/10/12 05:58:43 setuid sandbox: enabled 2019/10/12 05:58:43 namespace sandbox: enabled 2019/10/12 05:58:43 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 05:58:43 fault injection: enabled 2019/10/12 05:58:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 05:58:43 net packet injection: enabled 2019/10/12 05:58:43 net device setup: enabled 2019/10/12 05:58:43 concurrency sanitizer: enabled syzkaller login: [ 44.198266][ C0] ================================================================== [ 44.206423][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 44.215338][ C0] [ 44.217656][ C0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 44.225275][ C0] tick_do_update_jiffies64+0x105/0x260 [ 44.230812][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.235732][ C0] tick_sched_timer+0x43/0xe0 [ 44.240395][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.245582][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.250505][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.255960][ C0] apic_timer_interrupt+0xf/0x20 [ 44.260884][ C0] [ 44.263201][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 44.270733][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 44.276178][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.281107][ C0] tick_sched_timer+0x43/0xe0 [ 44.285779][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.291065][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.295991][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.301434][ C0] apic_timer_interrupt+0xf/0x20 [ 44.306348][ C0] [ 44.308657][ C0] Reported by Kernel Concurrency Sanitizer on: [ 44.314811][ C0] CPU: 0 PID: 7256 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.321988][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.332027][ C0] ================================================================== [ 44.340081][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 44.346655][ C0] CPU: 0 PID: 7256 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.353743][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.363781][ C0] Call Trace: [ 44.367050][ C0] [ 44.369894][ C0] dump_stack+0xf5/0x159 [ 44.374126][ C0] panic+0x209/0x639 [ 44.378008][ C0] ? vprintk_func+0x8d/0x140 [ 44.382592][ C0] kcsan_report.cold+0xc/0x1b [ 44.387261][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.392792][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.398416][ C0] __tsan_read8+0x2c/0x30 [ 44.402736][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 44.408187][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.413116][ C0] tick_sched_timer+0x43/0xe0 [ 44.417797][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.422993][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 44.428099][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.433029][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.438496][ C0] ? smp_call_function_single_interrupt+0x80/0x1c0 [ 44.445173][ C0] apic_timer_interrupt+0xf/0x20 [ 44.450110][ C0] [ 44.453045][ C0] RIP: 0033:0x41d197 [ 44.456941][ C0] Code: 08 49 83 f8 08 0f 8d e7 00 00 00 48 39 de 0f 83 de 00 00 00 0f ba e2 00 0f 83 ca 00 00 00 4c 8b 4c 24 78 4e 8d 14 0e 4d 8b 12 <4d> 85 d2 74 c9 4c 39 d0 77 c4 49 39 ca 73 bf 4c 89 44 24 48 48 89 [ 44.476620][ C0] RSP: 002b:000000c420305e10 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 44.485016][ C0] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420700000 [ 44.492996][ C0] RDX: 0000000000000005 RSI: 0000000000021720 RDI: 00007f3d144e3000 [ 44.500961][ C0] RBP: 000000c420305e78 R08: 0000000000000004 R09: 0000000001323520 [ 44.508928][ C0] R10: 00000000008a45ee R11: 000000c420305fc0 R12: 0000000000001a90 [ 44.516884][ C0] R13: 00000000000000ff R14: 00007f3d14517000 R15: 0000000000000002 [ 44.527397][ C0] Kernel Offset: disabled [ 44.531716][ C0] Rebooting in 86400 seconds..