[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.046553][ T26] audit: type=1800 audit(1570255388.532:25): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.066375][ T26] audit: type=1800 audit(1570255388.532:26): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.086519][ T26] audit: type=1800 audit(1570255388.532:27): pid=7045 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 '10.128.0.129' (ECDSA) to the list of known hosts. 2019/10/05 06:03:27 fuzzer started 2019/10/05 06:03:29 dialing manager at 10.128.0.105:35709 2019/10/05 06:03:29 syscalls: 2523 2019/10/05 06:03:29 code coverage: enabled 2019/10/05 06:03:29 comparison tracing: enabled 2019/10/05 06:03:29 extra coverage: extra coverage is not supported by the kernel 2019/10/05 06:03:29 setuid sandbox: enabled 2019/10/05 06:03:29 namespace sandbox: enabled 2019/10/05 06:03:29 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/05 06:03:29 fault injection: enabled 2019/10/05 06:03:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/05 06:03:29 net packet injection: enabled 2019/10/05 06:03:29 net device setup: enabled 2019/10/05 06:03:29 concurrency sanitizer: enabled syzkaller login: [ 54.791199][ T0] ================================================================== [ 54.799507][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 54.808426][ T0] [ 54.810732][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0: [ 54.818076][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 54.823595][ T0] do_idle+0x1e0/0x2c0 [ 54.827640][ T0] cpu_startup_entry+0x1b/0x20 [ 54.832379][ T0] rest_init+0xec/0xf6 [ 54.836428][ T0] arch_call_rest_init+0x17/0x37 [ 54.841339][ T0] start_kernel+0x83e/0x864 [ 54.845822][ T0] x86_64_start_reservations+0x29/0x2b [ 54.851386][ T0] x86_64_start_kernel+0x72/0x76 [ 54.856307][ T0] secondary_startup_64+0xa4/0xb0 [ 54.861308][ T0] [ 54.863620][ T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 54.870884][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 54.876408][ T0] do_idle+0x1e0/0x2c0 [ 54.880449][ T0] cpu_startup_entry+0x1b/0x20 [ 54.885191][ T0] start_secondary+0x207/0x260 [ 54.889929][ T0] secondary_startup_64+0xa4/0xb0 [ 54.894963][ T0] [ 54.897265][ T0] Reported by Kernel Concurrency Sanitizer on: [ 54.903394][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 54.910125][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.920170][ T0] ================================================================== [ 54.928225][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 54.934787][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 54.941517][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.951587][ T0] Call Trace: [ 54.954893][ T0] dump_stack+0xf5/0x159 [ 54.959115][ T0] panic+0x209/0x639 [ 54.962992][ T0] ? vprintk_func+0x8d/0x140 [ 54.967560][ T0] kcsan_report.cold+0x57/0xeb [ 54.972302][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 54.977825][ T0] __tsan_read4+0x2c/0x30 [ 54.982134][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 54.987661][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.993878][ T0] do_idle+0x1e0/0x2c0 [ 54.997923][ T0] ? complete+0x44/0x50 [ 55.002081][ T0] cpu_startup_entry+0x1b/0x20 [ 55.006841][ T0] start_secondary+0x207/0x260 [ 55.011581][ T0] secondary_startup_64+0xa4/0xb0 [ 55.017764][ T0] Kernel Offset: disabled [ 55.022092][ T0] Rebooting in 86400 seconds..