[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.567547][ T23] audit: type=1800 audit(1571015542.587:25): pid=7123 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.590082][ T23] audit: type=1800 audit(1571015542.587:26): pid=7123 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.612137][ T23] audit: type=1800 audit(1571015542.587:27): pid=7123 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 '10.128.0.169' (ECDSA) to the list of known hosts. 2019/10/14 01:12:31 fuzzer started 2019/10/14 01:12:33 dialing manager at 10.128.0.105:40973 2019/10/14 01:12:33 syscalls: 2523 2019/10/14 01:12:33 code coverage: enabled 2019/10/14 01:12:33 comparison tracing: enabled 2019/10/14 01:12:33 extra coverage: extra coverage is not supported by the kernel 2019/10/14 01:12:33 setuid sandbox: enabled 2019/10/14 01:12:33 namespace sandbox: enabled 2019/10/14 01:12:33 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 01:12:33 fault injection: enabled 2019/10/14 01:12:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 01:12:33 net packet injection: enabled 2019/10/14 01:12:33 net device setup: enabled 2019/10/14 01:12:33 concurrency sanitizer: enabled syzkaller login: [ 50.656467][ T0] ================================================================== [ 50.664730][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 50.673721][ T0] [ 50.676039][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 50.684375][ T0] tick_sched_do_timer+0xc0/0xe0 [ 50.689453][ T0] tick_sched_timer+0x43/0xe0 [ 50.695020][ T0] __hrtimer_run_queues+0x288/0x600 [ 50.700465][ T0] hrtimer_interrupt+0x22a/0x480 [ 50.705872][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.711337][ T0] apic_timer_interrupt+0xf/0x20 [ 50.716257][ T0] [ 50.718893][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 50.726478][ T0] tick_nohz_next_event+0x1a4/0x380 [ 50.732418][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 50.738067][ T0] do_idle+0x1e0/0x2c0 [ 50.742461][ T0] cpu_startup_entry+0x1b/0x20 [ 50.747211][ T0] start_secondary+0x207/0x260 [ 50.752035][ T0] secondary_startup_64+0xa4/0xb0 [ 50.757377][ T0] [ 50.759693][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.765998][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 50.774123][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.784354][ T0] ================================================================== [ 50.792561][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.799322][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 50.806204][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.816883][ T0] Call Trace: [ 50.820260][ T0] dump_stack+0xf5/0x159 [ 50.824497][ T0] panic+0x209/0x639 [ 50.829210][ T0] ? vprintk_func+0x8d/0x140 [ 50.833792][ T0] kcsan_report.cold+0xc/0x1b [ 50.838457][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.844006][ T0] __tsan_read4+0x2c/0x30 [ 50.848673][ T0] tick_nohz_next_event+0x1a4/0x380 [ 50.854024][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 50.859864][ T0] ? __tsan_read4+0x2c/0x30 [ 50.864640][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.871190][ T0] do_idle+0x1e0/0x2c0 [ 50.875379][ T0] ? complete+0x44/0x50 [ 50.879800][ T0] cpu_startup_entry+0x1b/0x20 [ 50.884620][ T0] start_secondary+0x207/0x260 [ 50.889387][ T0] secondary_startup_64+0xa4/0xb0 [ 50.896282][ T0] Kernel Offset: disabled [ 50.901382][ T0] Rebooting in 86400 seconds..