[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.287238][ T26] audit: type=1800 audit(1571121911.285:25): pid=7032 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.335759][ T26] audit: type=1800 audit(1571121911.285:26): pid=7032 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.356995][ T26] audit: type=1800 audit(1571121911.295:27): pid=7032 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 '10.128.0.87' (ECDSA) to the list of known hosts. 2019/10/15 06:45:18 fuzzer started 2019/10/15 06:45:19 dialing manager at 10.128.0.105:33683 2019/10/15 06:45:19 syscalls: 2523 2019/10/15 06:45:19 code coverage: enabled 2019/10/15 06:45:19 comparison tracing: enabled 2019/10/15 06:45:19 extra coverage: extra coverage is not supported by the kernel 2019/10/15 06:45:19 setuid sandbox: enabled 2019/10/15 06:45:19 namespace sandbox: enabled 2019/10/15 06:45:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 06:45:19 fault injection: enabled 2019/10/15 06:45:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 06:45:19 net packet injection: enabled 2019/10/15 06:45:19 net device setup: enabled 2019/10/15 06:45:19 concurrency sanitizer: enabled syzkaller login: [ 43.900939][ T0] ================================================================== [ 43.909152][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 43.917718][ T0] [ 43.920025][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 43.927390][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 43.932909][ T0] do_idle+0x1e0/0x2c0 [ 43.936953][ T0] cpu_startup_entry+0x1b/0x20 [ 43.941702][ T0] rest_init+0xec/0xf6 [ 43.945748][ T0] arch_call_rest_init+0x17/0x37 [ 43.950676][ T0] start_kernel+0x83e/0x864 [ 43.955158][ T0] x86_64_start_reservations+0x29/0x2b [ 43.960592][ T0] x86_64_start_kernel+0x72/0x76 [ 43.965508][ T0] secondary_startup_64+0xa4/0xb0 [ 43.970514][ T0] [ 43.972821][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 43.980079][ T0] tick_nohz_next_event+0x1a4/0x380 [ 43.985258][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 43.990776][ T0] do_idle+0x1e0/0x2c0 [ 43.994828][ T0] cpu_startup_entry+0x1b/0x20 [ 43.999583][ T0] start_secondary+0x207/0x260 [ 44.004331][ T0] secondary_startup_64+0xa4/0xb0 [ 44.009333][ T0] [ 44.011638][ T0] Reported by Kernel Concurrency Sanitizer on: [ 44.018039][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 44.024768][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.034801][ T0] ================================================================== [ 44.043904][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 44.050478][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 44.059554][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.069592][ T0] Call Trace: [ 44.072874][ T0] dump_stack+0xf5/0x159 [ 44.077133][ T0] panic+0x209/0x639 [ 44.081022][ T0] ? vprintk_func+0x8d/0x140 [ 44.085592][ T0] kcsan_report.cold+0xc/0x1b [ 44.090249][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.095775][ T0] __tsan_read4+0x2c/0x30 [ 44.100082][ T0] tick_nohz_next_event+0x1a4/0x380 [ 44.105259][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 44.110799][ T0] ? __tsan_read4+0x2c/0x30 [ 44.115280][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.121508][ T0] do_idle+0x1e0/0x2c0 [ 44.125569][ T0] cpu_startup_entry+0x1b/0x20 [ 44.130319][ T0] start_secondary+0x207/0x260 [ 44.135064][ T0] secondary_startup_64+0xa4/0xb0 [ 44.141365][ T0] Kernel Offset: disabled [ 44.145683][ T0] Rebooting in 86400 seconds..