[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.240639][ T26] audit: type=1800 audit(1570993450.046:25): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.278235][ T26] audit: type=1800 audit(1570993450.046:26): pid=7089 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.315563][ T26] audit: type=1800 audit(1570993450.046:27): pid=7089 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 '10.128.0.108' (ECDSA) to the list of known hosts. 2019/10/13 19:04:17 fuzzer started 2019/10/13 19:04:18 dialing manager at 10.128.0.105:40973 2019/10/13 19:04:18 syscalls: 2523 2019/10/13 19:04:18 code coverage: enabled 2019/10/13 19:04:18 comparison tracing: enabled 2019/10/13 19:04:18 extra coverage: extra coverage is not supported by the kernel 2019/10/13 19:04:18 setuid sandbox: enabled 2019/10/13 19:04:18 namespace sandbox: enabled 2019/10/13 19:04:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 19:04:18 fault injection: enabled 2019/10/13 19:04:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 19:04:18 net packet injection: enabled 2019/10/13 19:04:18 net device setup: enabled 2019/10/13 19:04:18 concurrency sanitizer: enabled syzkaller login: [ 43.304735][ T0] ================================================================== [ 43.312855][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 43.321789][ T0] [ 43.324098][ T0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 43.331750][ T0] tick_do_update_jiffies64+0x105/0x260 [ 43.337311][ T0] tick_sched_do_timer+0xd4/0xe0 [ 43.342276][ T0] tick_sched_timer+0x43/0xe0 [ 43.346937][ T0] __hrtimer_run_queues+0x288/0x600 [ 43.352113][ T0] hrtimer_interrupt+0x22a/0x480 [ 43.357074][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.362595][ T0] apic_timer_interrupt+0xf/0x20 [ 43.367528][ T0] __kcsan_setup_watchpoint+0xc3/0x510 [ 43.372963][ T0] __tsan_write4+0x32/0x40 [ 43.377364][ T0] __build_skb_around+0xcb/0x1a0 [ 43.382290][ T0] __build_skb+0x63/0x80 [ 43.386515][ T0] __napi_alloc_skb+0x18a/0x210 [ 43.391345][ T0] page_to_skb+0x8d/0x480 [ 43.395658][ T0] receive_buf+0x17c7/0x30b0 [ 43.400225][ T0] [ 43.402530][ T0] read to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 0: [ 43.409786][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 43.415219][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 43.421085][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 43.426199][ T0] do_idle+0xb0/0x2c0 [ 43.430155][ T0] cpu_startup_entry+0x1b/0x20 [ 43.434896][ T0] rest_init+0xec/0xf6 [ 43.438951][ T0] arch_call_rest_init+0x17/0x37 [ 43.443863][ T0] start_kernel+0x83e/0x864 [ 43.448348][ T0] x86_64_start_reservations+0x29/0x2b [ 43.453791][ T0] x86_64_start_kernel+0x72/0x76 [ 43.458704][ T0] secondary_startup_64+0xa4/0xb0 [ 43.463705][ T0] [ 43.466003][ T0] Reported by Kernel Concurrency Sanitizer on: [ 43.472135][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 43.478863][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.488898][ T0] ================================================================== [ 43.497032][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 43.503595][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 43.510335][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.520380][ T0] Call Trace: [ 43.523648][ T0] dump_stack+0xf5/0x159 [ 43.527869][ T0] panic+0x209/0x639 [ 43.531756][ T0] ? x86_64_start_reservations+0x29/0x2b [ 43.537375][ T0] ? vprintk_func+0x8d/0x140 [ 43.541959][ T0] kcsan_report.cold+0xc/0x1b [ 43.546628][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 43.552159][ T0] __tsan_read8+0x2c/0x30 [ 43.556475][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 43.561913][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 43.567781][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 43.572871][ T0] do_idle+0xb0/0x2c0 [ 43.576843][ T0] cpu_startup_entry+0x1b/0x20 [ 43.581584][ T0] rest_init+0xec/0xf6 [ 43.585642][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 43.592812][ T0] arch_call_rest_init+0x17/0x37 [ 43.597814][ T0] start_kernel+0x83e/0x864 [ 43.602300][ T0] x86_64_start_reservations+0x29/0x2b [ 43.607743][ T0] x86_64_start_kernel+0x72/0x76 [ 43.612657][ T0] secondary_startup_64+0xa4/0xb0 [ 43.619100][ T0] Kernel Offset: disabled [ 43.623419][ T0] Rebooting in 86400 seconds..