[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.694820][ T25] audit: type=1800 audit(1571092795.830:25): pid=7099 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.735218][ T25] audit: type=1800 audit(1571092795.830:26): pid=7099 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.755513][ T25] audit: type=1800 audit(1571092795.830:27): pid=7099 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 22:40:07 fuzzer started 2019/10/14 22:40:08 dialing manager at 10.128.0.105:33683 2019/10/14 22:40:08 syscalls: 2523 2019/10/14 22:40:08 code coverage: enabled 2019/10/14 22:40:08 comparison tracing: enabled 2019/10/14 22:40:08 extra coverage: extra coverage is not supported by the kernel 2019/10/14 22:40:08 setuid sandbox: enabled 2019/10/14 22:40:08 namespace sandbox: enabled 2019/10/14 22:40:08 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 22:40:08 fault injection: enabled 2019/10/14 22:40:08 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 22:40:08 net packet injection: enabled 2019/10/14 22:40:08 net device setup: enabled 2019/10/14 22:40:08 concurrency sanitizer: enabled syzkaller login: [ 50.826809][ T0] ================================================================== [ 50.835586][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 50.844233][ T0] [ 50.846539][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 50.853888][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 50.859422][ T0] do_idle+0x1e0/0x2c0 [ 50.863468][ T0] cpu_startup_entry+0x1b/0x20 [ 50.868227][ T0] rest_init+0xec/0xf6 [ 50.872274][ T0] arch_call_rest_init+0x17/0x37 [ 50.877186][ T0] start_kernel+0x83e/0x864 [ 50.881696][ T0] x86_64_start_reservations+0x29/0x2b [ 50.887216][ T0] x86_64_start_kernel+0x72/0x76 [ 50.892130][ T0] secondary_startup_64+0xa4/0xb0 [ 50.897135][ T0] [ 50.899454][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 50.906724][ T0] tick_nohz_next_event+0x1a4/0x380 [ 50.911900][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 50.917424][ T0] do_idle+0x1e0/0x2c0 [ 50.921640][ T0] cpu_startup_entry+0x1b/0x20 [ 50.926404][ T0] start_secondary+0x207/0x260 [ 50.931154][ T0] secondary_startup_64+0xa4/0xb0 [ 50.936154][ T0] [ 50.938454][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.944586][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 50.951330][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.961357][ T0] ================================================================== [ 50.969403][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.975968][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 50.982709][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.992737][ T0] Call Trace: [ 50.996008][ T0] dump_stack+0xf5/0x159 [ 51.000922][ T0] panic+0x209/0x639 [ 51.004797][ T0] ? vprintk_func+0x8d/0x140 [ 51.009365][ T0] kcsan_report.cold+0xc/0x1b [ 51.014020][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 51.019543][ T0] __tsan_read4+0x2c/0x30 [ 51.023851][ T0] tick_nohz_next_event+0x1a4/0x380 [ 51.029041][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 51.034573][ T0] ? __tsan_read4+0x2c/0x30 [ 51.039058][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.045276][ T0] do_idle+0x1e0/0x2c0 [ 51.049409][ T0] ? complete+0x44/0x50 [ 51.053543][ T0] cpu_startup_entry+0x1b/0x20 [ 51.058286][ T0] start_secondary+0x207/0x260 [ 51.063027][ T0] secondary_startup_64+0xa4/0xb0 [ 51.069395][ T0] Kernel Offset: disabled [ 51.073718][ T0] Rebooting in 86400 seconds..