[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.368862][ T25] audit: type=1800 audit(1571295779.921:25): pid=7065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.405735][ T25] audit: type=1800 audit(1571295779.921:26): pid=7065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.434809][ T25] audit: type=1800 audit(1571295779.921:27): pid=7065 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 '10.128.0.117' (ECDSA) to the list of known hosts. 2019/10/17 07:03:06 fuzzer started 2019/10/17 07:03:07 dialing manager at 10.128.0.105:33899 2019/10/17 07:03:07 syscalls: 2524 2019/10/17 07:03:07 code coverage: enabled 2019/10/17 07:03:07 comparison tracing: enabled 2019/10/17 07:03:07 extra coverage: extra coverage is not supported by the kernel 2019/10/17 07:03:07 setuid sandbox: enabled 2019/10/17 07:03:07 namespace sandbox: enabled 2019/10/17 07:03:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 07:03:07 fault injection: enabled 2019/10/17 07:03:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 07:03:07 net packet injection: enabled 2019/10/17 07:03:07 net device setup: enabled 2019/10/17 07:03:07 concurrency sanitizer: enabled syzkaller login: [ 42.585793][ C0] ================================================================== [ 42.594145][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 42.603072][ C0] [ 42.605400][ C0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 42.613201][ C0] tick_do_update_jiffies64+0x105/0x260 [ 42.618910][ C0] tick_sched_do_timer+0xd4/0xe0 [ 42.623846][ C0] tick_sched_timer+0x43/0xe0 [ 42.628770][ C0] __hrtimer_run_queues+0x288/0x600 [ 42.634042][ C0] hrtimer_interrupt+0x22a/0x480 [ 42.639017][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 42.644471][ C0] apic_timer_interrupt+0xf/0x20 [ 42.649402][ C0] [ 42.651734][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 42.659283][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 42.665265][ C0] tick_sched_do_timer+0xd4/0xe0 [ 42.670192][ C0] tick_sched_timer+0x43/0xe0 [ 42.674874][ C0] __hrtimer_run_queues+0x288/0x600 [ 42.680086][ C0] hrtimer_interrupt+0x22a/0x480 [ 42.685514][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 42.691090][ C0] apic_timer_interrupt+0xf/0x20 [ 42.696286][ C0] [ 42.698611][ C0] Reported by Kernel Concurrency Sanitizer on: [ 42.704766][ C0] CPU: 0 PID: 7234 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.712660][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.722753][ C0] ================================================================== [ 42.731189][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 42.737768][ C0] CPU: 0 PID: 7234 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 42.745491][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.756596][ C0] Call Trace: [ 42.759953][ C0] [ 42.762803][ C0] dump_stack+0xf5/0x159 [ 42.767041][ C0] panic+0x210/0x640 [ 42.771035][ C0] ? vprintk_func+0x8d/0x140 [ 42.775646][ C0] kcsan_report.cold+0xc/0x1b [ 42.781336][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 42.786878][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 42.792884][ C0] __tsan_read8+0x2c/0x30 [ 42.797226][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 42.802886][ C0] tick_sched_do_timer+0xd4/0xe0 [ 42.807844][ C0] tick_sched_timer+0x43/0xe0 [ 42.812863][ C0] __hrtimer_run_queues+0x288/0x600 [ 42.818069][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 42.823192][ C0] hrtimer_interrupt+0x22a/0x480 [ 42.828131][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 42.833662][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 42.839291][ C0] apic_timer_interrupt+0xf/0x20 [ 42.844207][ C0] [ 42.847170][ C0] RIP: 0033:0x41d474 [ 42.851245][ C0] Code: 0f 83 51 01 00 00 48 85 ff 0f 84 40 01 00 00 41 83 fa 03 0f 83 2b 01 00 00 45 8d 42 01 44 0f b6 0b 49 89 ca 44 89 c1 41 d3 e9 <48> 83 ff 08 74 0b 41 0f ba e1 04 0f 83 db 00 00 00 41 0f ba e1 00 [ 42.871455][ C0] RSP: 002b:000000c420151e90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 42.879957][ C0] RAX: 000000c420000000 RBX: 000000c41ffdc447 RCX: 0000000000000000 [ 42.888293][ C0] RDX: 000000c420800000 RSI: 000000c420460000 RDI: 0000000000017700 [ 42.896259][ C0] RBP: 000000c420151f28 R08: 0000000000000000 R09: 00000000000000f0 [ 42.904240][ C0] R10: 0000000000020000 R11: 00007f44876658b8 R12: 000000c420329000 [ 42.912204][ C0] R13: 000000000000001c R14: 0000000000000000 R15: 0000000000000000 [ 42.921722][ C0] Kernel Offset: disabled [ 42.926067][ C0] Rebooting in 86400 seconds..