[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.236760][ T25] audit: type=1800 audit(1570966815.680:25): pid=7095 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.256734][ T25] audit: type=1800 audit(1570966815.680:26): pid=7095 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.285820][ T25] audit: type=1800 audit(1570966815.680:27): pid=7095 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. 2019/10/13 11:40:25 fuzzer started 2019/10/13 11:40:27 dialing manager at 10.128.0.105:40973 2019/10/13 11:40:27 syscalls: 2523 2019/10/13 11:40:27 code coverage: enabled 2019/10/13 11:40:27 comparison tracing: enabled 2019/10/13 11:40:27 extra coverage: extra coverage is not supported by the kernel 2019/10/13 11:40:27 setuid sandbox: enabled 2019/10/13 11:40:27 namespace sandbox: enabled 2019/10/13 11:40:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 11:40:27 fault injection: enabled 2019/10/13 11:40:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 11:40:27 net packet injection: enabled 2019/10/13 11:40:27 net device setup: enabled 2019/10/13 11:40:27 concurrency sanitizer: enabled syzkaller login: [ 50.720794][ T0] ================================================================== [ 50.728934][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 50.737959][ T0] [ 50.740299][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 50.747932][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 50.753504][ T0] do_idle+0x1e0/0x2c0 [ 50.757570][ T0] cpu_startup_entry+0x1b/0x20 [ 50.762331][ T0] rest_init+0xec/0xf6 [ 50.766401][ T0] arch_call_rest_init+0x17/0x37 [ 50.771340][ T0] start_kernel+0x83e/0x864 [ 50.775843][ T0] x86_64_start_reservations+0x29/0x2b [ 50.781300][ T0] x86_64_start_kernel+0x72/0x76 [ 50.786239][ T0] secondary_startup_64+0xa4/0xb0 [ 50.791246][ T0] [ 50.793575][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 50.800863][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 50.806407][ T0] do_idle+0x1e0/0x2c0 [ 50.810470][ T0] cpu_startup_entry+0x1b/0x20 [ 50.815229][ T0] start_secondary+0x207/0x260 [ 50.819991][ T0] secondary_startup_64+0xa4/0xb0 [ 50.824995][ T0] [ 50.827307][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.833459][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 50.840207][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.850255][ T0] ================================================================== [ 50.858321][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.864918][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 50.871675][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.881730][ T0] Call Trace: [ 50.885027][ T0] dump_stack+0xf5/0x159 [ 50.889283][ T0] panic+0x209/0x639 [ 50.893185][ T0] ? vprintk_func+0x8d/0x140 [ 50.897783][ T0] kcsan_report.cold+0xc/0x1b [ 50.902471][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.908025][ T0] __tsan_read4+0x2c/0x30 [ 50.912361][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 50.917923][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.924171][ T0] do_idle+0x1e0/0x2c0 [ 50.928242][ T0] ? complete+0x44/0x50 [ 50.932407][ T0] cpu_startup_entry+0x1b/0x20 [ 50.937182][ T0] start_secondary+0x207/0x260 [ 50.941952][ T0] secondary_startup_64+0xa4/0xb0 [ 50.948312][ T0] Kernel Offset: disabled [ 50.952642][ T0] Rebooting in 86400 seconds..