[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.093687][ T25] audit: type=1800 audit(1570421172.224:25): pid=7197 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.114031][ T25] audit: type=1800 audit(1570421172.224:26): pid=7197 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.114050][ T25] audit: type=1800 audit(1570421172.224:27): pid=7197 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 '10.128.0.47' (ECDSA) to the list of known hosts. 2019/10/07 04:06:25 fuzzer started 2019/10/07 04:06:27 dialing manager at 10.128.0.105:35709 2019/10/07 04:06:27 syscalls: 2523 2019/10/07 04:06:27 code coverage: enabled 2019/10/07 04:06:27 comparison tracing: enabled 2019/10/07 04:06:27 extra coverage: extra coverage is not supported by the kernel 2019/10/07 04:06:27 setuid sandbox: enabled 2019/10/07 04:06:27 namespace sandbox: enabled 2019/10/07 04:06:27 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/07 04:06:27 fault injection: enabled 2019/10/07 04:06:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/07 04:06:27 net packet injection: enabled 2019/10/07 04:06:27 net device setup: enabled 2019/10/07 04:06:27 concurrency sanitizer: enabled syzkaller login: [ 51.199046][ T0] ================================================================== [ 51.207508][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 51.216066][ T0] [ 51.218402][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 51.225760][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 51.231772][ T0] do_idle+0x1e0/0x2c0 [ 51.235846][ T0] cpu_startup_entry+0x1b/0x20 [ 51.240746][ T0] start_secondary+0x207/0x260 [ 51.245503][ T0] secondary_startup_64+0xa4/0xb0 [ 51.250512][ T0] [ 51.252829][ T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0: [ 51.260314][ T0] tick_nohz_next_event+0x1a4/0x380 [ 51.265493][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 51.271018][ T0] do_idle+0x1e0/0x2c0 [ 51.275068][ T0] cpu_startup_entry+0x1b/0x20 [ 51.279839][ T0] rest_init+0xec/0xf6 [ 51.284527][ T0] arch_call_rest_init+0x17/0x37 [ 51.289808][ T0] start_kernel+0x83e/0x864 [ 51.294819][ T0] x86_64_start_reservations+0x29/0x2b [ 51.300293][ T0] x86_64_start_kernel+0x72/0x76 [ 51.305252][ T0] secondary_startup_64+0xa4/0xb0 [ 51.310596][ T0] [ 51.313273][ T0] Reported by Kernel Concurrency Sanitizer on: [ 51.319433][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 51.326920][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.336980][ T0] ================================================================== [ 51.345035][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 51.351626][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 51.358389][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.369290][ T0] Call Trace: [ 51.372904][ T0] dump_stack+0xf5/0x159 [ 51.377163][ T0] panic+0x209/0x639 [ 51.381212][ T0] ? vprintk_func+0x8d/0x140 [ 51.385808][ T0] kcsan_report.cold+0x57/0xeb [ 51.390641][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 51.396180][ T0] __tsan_read4+0x2c/0x30 [ 51.400679][ T0] tick_nohz_next_event+0x1a4/0x380 [ 51.405901][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 51.411491][ T0] ? __tsan_read4+0x2c/0x30 [ 51.416265][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.422769][ T0] do_idle+0x1e0/0x2c0 [ 51.426828][ T0] cpu_startup_entry+0x1b/0x20 [ 51.431590][ T0] rest_init+0xec/0xf6 [ 51.435649][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 51.442861][ T0] arch_call_rest_init+0x17/0x37 [ 51.447809][ T0] start_kernel+0x83e/0x864 [ 51.452306][ T0] x86_64_start_reservations+0x29/0x2b [ 51.457757][ T0] x86_64_start_kernel+0x72/0x76 [ 51.462684][ T0] secondary_startup_64+0xa4/0xb0 [ 51.469310][ T0] Kernel Offset: disabled [ 51.473656][ T0] Rebooting in 86400 seconds..