[ 34.684640][ T26] audit: type=1800 audit(1570915083.052:25): pid=7134 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.710756][ T26] audit: type=1800 audit(1570915083.052:26): pid=7134 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.757081][ T26] audit: type=1800 audit(1570915083.052:27): pid=7134 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. [ 35.217695][ T7199] sshd (7199) 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 '10.128.0.6' (ECDSA) to the list of known hosts. 2019/10/12 21:18:11 fuzzer started 2019/10/12 21:18:12 dialing manager at 10.128.0.105:43913 2019/10/12 21:18:12 syscalls: 2523 2019/10/12 21:18:12 code coverage: enabled 2019/10/12 21:18:12 comparison tracing: enabled 2019/10/12 21:18:12 extra coverage: extra coverage is not supported by the kernel 2019/10/12 21:18:12 setuid sandbox: enabled 2019/10/12 21:18:12 namespace sandbox: enabled 2019/10/12 21:18:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 21:18:12 fault injection: enabled 2019/10/12 21:18:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 21:18:12 net packet injection: enabled 2019/10/12 21:18:12 net device setup: enabled 2019/10/12 21:18:12 concurrency sanitizer: enabled syzkaller login: [ 44.448470][ C0] ================================================================== [ 44.456966][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 44.465879][ C0] [ 44.468187][ C0] write to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 1: [ 44.475540][ C0] tick_do_update_jiffies64+0x105/0x260 [ 44.481064][ C0] tick_irq_enter+0x139/0x1c0 [ 44.485718][ C0] irq_enter+0x4f/0x60 [ 44.489764][ C0] smp_apic_timer_interrupt+0x55/0x280 [ 44.495195][ C0] apic_timer_interrupt+0xf/0x20 [ 44.500109][ C0] native_safe_halt+0xe/0x10 [ 44.504682][ C0] arch_cpu_idle+0x1f/0x30 [ 44.509083][ C0] default_idle_call+0x1e/0x40 [ 44.513822][ C0] do_idle+0x1ea/0x2c0 [ 44.517877][ C0] cpu_startup_entry+0x1b/0x20 [ 44.522622][ C0] start_secondary+0x207/0x260 [ 44.527361][ C0] secondary_startup_64+0xa4/0xb0 [ 44.532354][ C0] [ 44.534671][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 44.542192][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 44.547623][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.552536][ C0] tick_sched_timer+0x43/0xe0 [ 44.557192][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.562378][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.567291][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.572726][ C0] apic_timer_interrupt+0xf/0x20 [ 44.577643][ C0] [ 44.579945][ C0] Reported by Kernel Concurrency Sanitizer on: [ 44.586089][ C0] CPU: 0 PID: 7286 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.593168][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.603207][ C0] ================================================================== [ 44.611242][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 44.617817][ C0] CPU: 0 PID: 7286 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.624894][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.634923][ C0] Call Trace: [ 44.638183][ C0] [ 44.641016][ C0] dump_stack+0xf5/0x159 [ 44.645249][ C0] panic+0x209/0x639 [ 44.649212][ C0] ? vprintk_func+0x8d/0x140 [ 44.653780][ C0] kcsan_report.cold+0xc/0x1b [ 44.658439][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.663975][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.669593][ C0] __tsan_read8+0x2c/0x30 [ 44.673945][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 44.679398][ C0] tick_sched_do_timer+0xd4/0xe0 [ 44.684321][ C0] tick_sched_timer+0x43/0xe0 [ 44.688985][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.694172][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 44.699269][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.704214][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.709654][ C0] apic_timer_interrupt+0xf/0x20 [ 44.714575][ C0] [ 44.717491][ C0] RIP: 0033:0x6099f6 [ 44.721366][ C0] Code: 48 8d 6c 24 30 48 8b 44 24 48 48 8b 10 e9 b6 00 00 00 48 8b 44 24 48 48 8b 54 24 20 48 8b 5c 24 40 48 8b 73 20 48 39 d6 73 35 <48> 89 1c 24 e8 b1 fe ff ff 48 8b 44 24 10 48 8b 4c 24 08 48 85 c9 [ 44.740957][ C0] RSP: 002b:000000c4204efa40 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 44.749348][ C0] RAX: 000000c420304028 RBX: 000000c420304000 RCX: 0000000000000000 [ 44.757293][ C0] RDX: 000000000000000c RSI: 0000000000000009 RDI: 000000c4204b9a8e [ 44.765240][ C0] RBP: 000000c4204efa70 R08: 000000c4204b4000 R09: 0000000000005a92 [ 44.773197][ C0] R10: 00000000ffffffff R11: 00000000000055b8 R12: 0000000000000008 [ 44.781148][ C0] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 44.790578][ C0] Kernel Offset: disabled [ 44.794897][ C0] Rebooting in 86400 seconds..