[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.594693][ T25] audit: type=1800 audit(1571093856.465:25): pid=7098 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.630773][ T25] audit: type=1800 audit(1571093856.465:26): pid=7098 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.673331][ T25] audit: type=1800 audit(1571093856.475:27): pid=7098 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 '10.128.10.2' (ECDSA) to the list of known hosts. 2019/10/14 22:57:43 fuzzer started 2019/10/14 22:57:44 dialing manager at 10.128.0.105:33683 2019/10/14 22:57:44 syscalls: 2523 2019/10/14 22:57:44 code coverage: enabled 2019/10/14 22:57:44 comparison tracing: enabled 2019/10/14 22:57:44 extra coverage: extra coverage is not supported by the kernel 2019/10/14 22:57:44 setuid sandbox: enabled 2019/10/14 22:57:44 namespace sandbox: enabled 2019/10/14 22:57:44 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 22:57:44 fault injection: enabled 2019/10/14 22:57:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 22:57:44 net packet injection: enabled 2019/10/14 22:57:44 net device setup: enabled 2019/10/14 22:57:44 concurrency sanitizer: enabled syzkaller login: [ 43.127830][ C1] ================================================================== [ 43.135982][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 43.144901][ C1] [ 43.147220][ C1] write to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 0: [ 43.154608][ C1] tick_do_update_jiffies64+0x105/0x260 [ 43.160145][ C1] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 43.166042][ C1] tick_nohz_idle_exit+0x1af/0x1e0 [ 43.171136][ C1] do_idle+0xb0/0x2c0 [ 43.175095][ C1] cpu_startup_entry+0x1b/0x20 [ 43.179834][ C1] rest_init+0xec/0xf6 [ 43.183882][ C1] arch_call_rest_init+0x17/0x37 [ 43.188845][ C1] start_kernel+0x83e/0x864 [ 43.193325][ C1] x86_64_start_reservations+0x29/0x2b [ 43.198767][ C1] x86_64_start_kernel+0x72/0x76 [ 43.203721][ C1] secondary_startup_64+0xa4/0xb0 [ 43.208732][ C1] [ 43.211040][ C1] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 43.218587][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 43.224020][ C1] tick_sched_do_timer+0xd4/0xe0 [ 43.228934][ C1] tick_sched_timer+0x43/0xe0 [ 43.233598][ C1] __hrtimer_run_queues+0x288/0x600 [ 43.238795][ C1] hrtimer_interrupt+0x22a/0x480 [ 43.243709][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 43.249156][ C1] apic_timer_interrupt+0xf/0x20 [ 43.254063][ C1] [ 43.256362][ C1] Reported by Kernel Concurrency Sanitizer on: [ 43.262492][ C1] CPU: 1 PID: 7264 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 43.269570][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.279600][ C1] ================================================================== [ 43.287645][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 43.294222][ C1] CPU: 1 PID: 7264 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 43.301305][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.311876][ C1] Call Trace: [ 43.315139][ C1] [ 43.317978][ C1] dump_stack+0xf5/0x159 [ 43.322243][ C1] panic+0x209/0x639 [ 43.326156][ C1] ? vprintk_func+0x8d/0x140 [ 43.330776][ C1] kcsan_report.cold+0xc/0x1b [ 43.335460][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 43.341040][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 43.346783][ C1] __tsan_read8+0x2c/0x30 [ 43.351117][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 43.357873][ C1] tick_sched_do_timer+0xd4/0xe0 [ 43.362791][ C1] tick_sched_timer+0x43/0xe0 [ 43.367467][ C1] __hrtimer_run_queues+0x288/0x600 [ 43.372646][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 43.377758][ C1] hrtimer_interrupt+0x22a/0x480 [ 43.382698][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 43.388145][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 43.393767][ C1] apic_timer_interrupt+0xf/0x20 [ 43.398783][ C1] [ 43.401710][ C1] RIP: 0033:0x609a40 [ 43.405594][ C1] Code: 00 48 89 4c 24 58 48 89 44 24 60 48 8b 6c 24 30 48 83 c4 38 c3 8b 53 18 89 d7 81 e2 ff 01 00 00 8b 54 90 08 41 89 d0 83 e2 0f <48> 83 fa 09 0f 86 1b 01 00 00 48 8b 90 10 08 00 00 4c 8b 88 08 08 [ 43.425173][ C1] RSP: 002b:000000c420333a40 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 43.435817][ C1] RAX: 000000c4204cc028 RBX: 000000c4204cc000 RCX: 0000000000000000 [ 43.443765][ C1] RDX: 0000000000000008 RSI: 0000000000000011 RDI: 00000000000055b6 [ 43.451728][ C1] RBP: 000000c420333a70 R08: 0000000000000578 R09: 00000000000001b6 [ 43.459697][ C1] R10: 00000000ffffffff R11: 000000000000575f R12: 0000000000000040 [ 43.467686][ C1] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 43.477090][ C1] Kernel Offset: disabled [ 43.481423][ C1] Rebooting in 86400 seconds..