[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.525529][ T23] audit: type=1800 audit(1571230347.953:25): pid=7079 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.552730][ T23] audit: type=1800 audit(1571230347.953:26): pid=7079 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.588016][ T23] audit: type=1800 audit(1571230347.953:27): pid=7079 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 '10.128.0.210' (ECDSA) to the list of known hosts. 2019/10/16 12:52:37 fuzzer started 2019/10/16 12:52:38 dialing manager at 10.128.0.105:34737 2019/10/16 12:52:38 syscalls: 2524 2019/10/16 12:52:38 code coverage: enabled 2019/10/16 12:52:38 comparison tracing: enabled 2019/10/16 12:52:38 extra coverage: extra coverage is not supported by the kernel 2019/10/16 12:52:38 setuid sandbox: enabled 2019/10/16 12:52:38 namespace sandbox: enabled 2019/10/16 12:52:38 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 12:52:38 fault injection: enabled 2019/10/16 12:52:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 12:52:38 net packet injection: enabled 2019/10/16 12:52:38 net device setup: enabled 2019/10/16 12:52:38 concurrency sanitizer: enabled syzkaller login: [ 45.592971][ C1] ================================================================== [ 45.601115][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 45.610258][ C1] [ 45.612567][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 45.620175][ C1] tick_do_update_jiffies64+0x105/0x260 [ 45.625720][ C1] tick_sched_do_timer+0xd4/0xe0 [ 45.630640][ C1] tick_sched_timer+0x43/0xe0 [ 45.635291][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.640462][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.645393][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.650827][ C1] apic_timer_interrupt+0xf/0x20 [ 45.655733][ C1] [ 45.658059][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 45.665580][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 45.671018][ C1] tick_sched_do_timer+0xd4/0xe0 [ 45.675930][ C1] tick_sched_timer+0x43/0xe0 [ 45.680588][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.685759][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.690677][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.696113][ C1] apic_timer_interrupt+0xf/0x20 [ 45.701022][ C1] [ 45.703342][ C1] Reported by Kernel Concurrency Sanitizer on: [ 45.709472][ C1] CPU: 1 PID: 7229 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.716973][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.727060][ C1] ================================================================== [ 45.735202][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 45.741774][ C1] CPU: 1 PID: 7229 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.749207][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.759240][ C1] Call Trace: [ 45.762511][ C1] [ 45.765350][ C1] dump_stack+0xf5/0x159 [ 45.769571][ C1] panic+0x210/0x640 [ 45.773457][ C1] ? vprintk_func+0x8d/0x140 [ 45.778026][ C1] kcsan_report.cold+0xc/0x1b [ 45.782682][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.788206][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.793830][ C1] __tsan_read8+0x2c/0x30 [ 45.798155][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 45.803603][ C1] tick_sched_do_timer+0xd4/0xe0 [ 45.808524][ C1] tick_sched_timer+0x43/0xe0 [ 45.813187][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.818450][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 45.823600][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.828521][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.833961][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 45.839576][ C1] apic_timer_interrupt+0xf/0x20 [ 45.844488][ C1] [ 45.847414][ C1] RIP: 0033:0x41d152 [ 45.851291][ C1] Code: 58 31 d2 48 8b 9c 24 80 00 00 00 48 39 da 0f 83 2b 01 00 00 48 89 d6 48 c1 ea 06 48 8b bc 24 88 00 00 00 4c 8d 04 17 41 84 00 <0f> b6 14 17 85 d2 75 06 48 8d 56 40 eb cb 45 31 c0 eb 09 49 ff c0 [ 45.870978][ C1] RSP: 002b:000000c42004be00 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 45.879477][ C1] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420800000 [ 45.887461][ C1] RDX: 0000000000000deb RSI: 0000000000037ac0 RDI: 00007f56b9576000 [ 45.895420][ C1] RBP: 000000c42004be68 R08: 00007f56b9576deb R09: 0000000000ee4f80 [ 45.903370][ C1] R10: 0000000000d94300 R11: 000000c42004bd20 R12: 0000000000000000 [ 45.911320][ C1] R13: 00000000000000f2 R14: 0000000000000032 R15: 00000000000000aa [ 45.920520][ C1] Kernel Offset: disabled [ 45.924851][ C1] Rebooting in 86400 seconds..