[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.140777][ T25] audit: type=1800 audit(1570969727.341:25): pid=6977 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.160436][ T25] audit: type=1800 audit(1570969727.351:26): pid=6977 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.180452][ T25] audit: type=1800 audit(1570969727.351:27): pid=6977 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 '10.128.0.65' (ECDSA) to the list of known hosts. 2019/10/13 12:28:57 fuzzer started 2019/10/13 12:28:58 dialing manager at 10.128.0.105:40973 2019/10/13 12:28:58 syscalls: 2523 2019/10/13 12:28:58 code coverage: enabled 2019/10/13 12:28:58 comparison tracing: enabled 2019/10/13 12:28:58 extra coverage: extra coverage is not supported by the kernel 2019/10/13 12:28:58 setuid sandbox: enabled 2019/10/13 12:28:58 namespace sandbox: enabled 2019/10/13 12:28:58 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 12:28:58 fault injection: enabled 2019/10/13 12:28:58 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 12:28:58 net packet injection: enabled 2019/10/13 12:28:58 net device setup: enabled 2019/10/13 12:28:58 concurrency sanitizer: enabled syzkaller login: [ 45.051369][ C1] ================================================================== [ 45.059582][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 45.067625][ C1] [ 45.069932][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 45.077455][ C1] tick_sched_do_timer+0x33/0xe0 [ 45.082368][ C1] tick_sched_timer+0x43/0xe0 [ 45.087048][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.092487][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.097443][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.102877][ C1] apic_timer_interrupt+0xf/0x20 [ 45.107896][ C1] native_safe_halt+0xe/0x10 [ 45.112471][ C1] arch_cpu_idle+0x1f/0x30 [ 45.116868][ C1] default_idle_call+0x1e/0x40 [ 45.121608][ C1] do_idle+0x1ea/0x2c0 [ 45.125667][ C1] cpu_startup_entry+0x1b/0x20 [ 45.130428][ C1] rest_init+0xec/0xf6 [ 45.134489][ C1] arch_call_rest_init+0x17/0x37 [ 45.139458][ C1] start_kernel+0x83e/0x864 [ 45.143932][ C1] [ 45.146243][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 45.153869][ C1] tick_sched_do_timer+0xc0/0xe0 [ 45.158784][ C1] tick_sched_timer+0x43/0xe0 [ 45.163440][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.168615][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.173545][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.178980][ C1] apic_timer_interrupt+0xf/0x20 [ 45.183901][ C1] [ 45.186202][ C1] Reported by Kernel Concurrency Sanitizer on: [ 45.192332][ C1] CPU: 1 PID: 7125 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.199427][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.209457][ C1] ================================================================== [ 45.217493][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 45.224057][ C1] CPU: 1 PID: 7125 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.231137][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.241183][ C1] Call Trace: [ 45.244442][ C1] [ 45.247300][ C1] dump_stack+0xf5/0x159 [ 45.251525][ C1] panic+0x209/0x639 [ 45.255400][ C1] ? vprintk_func+0x8d/0x140 [ 45.259970][ C1] kcsan_report.cold+0xc/0x1b [ 45.264625][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.270164][ C1] __tsan_write4+0x32/0x40 [ 45.274561][ C1] tick_sched_do_timer+0xc0/0xe0 [ 45.279476][ C1] tick_sched_timer+0x43/0xe0 [ 45.284146][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.289335][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 45.294469][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.299402][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.304853][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 45.310463][ C1] apic_timer_interrupt+0xf/0x20 [ 45.315386][ C1] [ 45.318317][ C1] RIP: 0033:0x40acdc [ 45.322194][ C1] Code: 58 48 89 34 24 48 89 5c 24 08 e8 bf df ff ff 48 8b 44 24 20 48 8b 4c 24 50 0f b6 51 09 48 89 cb 89 d1 be 01 00 00 00 48 d3 e6 <48> 8d 56 ff 48 21 c2 48 8b 73 18 48 85 f6 0f 85 ac 00 00 00 48 8b [ 45.341773][ C1] RSP: 002b:000000c4202637f0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 45.350249][ C1] RAX: b0e1fcedb6246efc RBX: 000000c4201a9290 RCX: 000000000000000b [ 45.358196][ C1] RDX: 000000000000000b RSI: 0000000000000800 RDI: 0000000000000038 [ 45.366156][ C1] RBP: 000000c420263828 R08: 000000c420610000 R09: 000000c420259e38 [ 45.374103][ C1] R10: 000000c420259e30 R11: 0000000000000000 R12: 0000000000000002 [ 45.382060][ C1] R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000001 [ 45.391340][ C1] Kernel Offset: disabled [ 45.395663][ C1] Rebooting in 86400 seconds..