[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.401584][ T25] audit: type=1800 audit(1570730124.092:25): pid=7114 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.428735][ T25] audit: type=1800 audit(1570730124.102:26): pid=7114 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.458506][ T25] audit: type=1800 audit(1570730124.102:27): pid=7114 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 '10.128.1.49' (ECDSA) to the list of known hosts. 2019/10/10 17:55:32 fuzzer started 2019/10/10 17:55:33 dialing manager at 10.128.0.105:34287 2019/10/10 17:55:33 syscalls: 2523 2019/10/10 17:55:33 code coverage: enabled 2019/10/10 17:55:33 comparison tracing: enabled 2019/10/10 17:55:33 extra coverage: extra coverage is not supported by the kernel 2019/10/10 17:55:33 setuid sandbox: enabled 2019/10/10 17:55:33 namespace sandbox: enabled 2019/10/10 17:55:33 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 17:55:33 fault injection: enabled 2019/10/10 17:55:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 17:55:33 net packet injection: enabled 2019/10/10 17:55:33 net device setup: enabled 2019/10/10 17:55:33 concurrency sanitizer: enabled syzkaller login: [ 46.090719][ T0] ================================================================== [ 46.099027][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 46.107628][ T0] [ 46.109975][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 46.117358][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 46.122880][ T0] do_idle+0x1e0/0x2c0 [ 46.126925][ T0] cpu_startup_entry+0x1b/0x20 [ 46.131662][ T0] rest_init+0xec/0xf6 [ 46.135707][ T0] arch_call_rest_init+0x17/0x37 [ 46.140622][ T0] start_kernel+0x83e/0x864 [ 46.145101][ T0] x86_64_start_reservations+0x29/0x2b [ 46.150536][ T0] x86_64_start_kernel+0x72/0x76 [ 46.155464][ T0] secondary_startup_64+0xa4/0xb0 [ 46.160456][ T0] [ 46.162768][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 46.170028][ T0] tick_nohz_next_event+0x1a4/0x380 [ 46.175245][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 46.180769][ T0] do_idle+0x1e0/0x2c0 [ 46.184813][ T0] cpu_startup_entry+0x1b/0x20 [ 46.189552][ T0] start_secondary+0x207/0x260 [ 46.194287][ T0] secondary_startup_64+0xa4/0xb0 [ 46.199292][ T0] [ 46.201598][ T0] Reported by Kernel Concurrency Sanitizer on: [ 46.207725][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 46.214456][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.224483][ T0] ================================================================== [ 46.232518][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 46.239077][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 46.245808][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.255834][ T0] Call Trace: [ 46.259101][ T0] dump_stack+0xf5/0x159 [ 46.263322][ T0] panic+0x209/0x639 [ 46.267211][ T0] ? vprintk_func+0x8d/0x140 [ 46.271780][ T0] kcsan_report.cold+0xc/0x1b [ 46.276437][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.281961][ T0] __tsan_read4+0x2c/0x30 [ 46.286272][ T0] tick_nohz_next_event+0x1a4/0x380 [ 46.291448][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 46.296978][ T0] ? __tsan_read4+0x2c/0x30 [ 46.301476][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.307694][ T0] do_idle+0x1e0/0x2c0 [ 46.311738][ T0] ? complete+0x44/0x50 [ 46.315877][ T0] cpu_startup_entry+0x1b/0x20 [ 46.320616][ T0] start_secondary+0x207/0x260 [ 46.325362][ T0] secondary_startup_64+0xa4/0xb0 [ 46.331669][ T0] Kernel Offset: disabled [ 46.335996][ T0] Rebooting in 86400 seconds..