[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 43.077720][ T26] audit: type=1800 audit(1570986450.860:25): pid=7207 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 43.097704][ T26] audit: type=1800 audit(1570986450.860:26): pid=7207 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 43.119375][ T26] audit: type=1800 audit(1570986450.860:27): pid=7207 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 '10.128.10.49' (ECDSA) to the list of known hosts. 2019/10/13 17:07:43 fuzzer started 2019/10/13 17:07:44 dialing manager at 10.128.0.105:40973 2019/10/13 17:07:44 syscalls: 2523 2019/10/13 17:07:44 code coverage: enabled 2019/10/13 17:07:44 comparison tracing: enabled 2019/10/13 17:07:44 extra coverage: extra coverage is not supported by the kernel 2019/10/13 17:07:44 setuid sandbox: enabled 2019/10/13 17:07:44 namespace sandbox: enabled 2019/10/13 17:07:44 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 17:07:44 fault injection: enabled 2019/10/13 17:07:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 17:07:44 net packet injection: enabled 2019/10/13 17:07:44 net device setup: enabled 2019/10/13 17:07:44 concurrency sanitizer: enabled syzkaller login: [ 57.229143][ T0] ================================================================== [ 57.237403][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 57.245992][ T0] [ 57.248299][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 57.255657][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 57.261182][ T0] do_idle+0x1e0/0x2c0 [ 57.265229][ T0] cpu_startup_entry+0x1b/0x20 [ 57.269972][ T0] start_secondary+0x207/0x260 [ 57.274717][ T0] secondary_startup_64+0xa4/0xb0 [ 57.279719][ T0] [ 57.282031][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 57.289300][ T0] tick_nohz_next_event+0x1a4/0x380 [ 57.294481][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 57.300001][ T0] do_idle+0x1e0/0x2c0 [ 57.304066][ T0] cpu_startup_entry+0x1b/0x20 [ 57.308813][ T0] rest_init+0xec/0xf6 [ 57.312862][ T0] arch_call_rest_init+0x17/0x37 [ 57.317776][ T0] start_kernel+0x83e/0x864 [ 57.322258][ T0] x86_64_start_reservations+0x29/0x2b [ 57.327707][ T0] x86_64_start_kernel+0x72/0x76 [ 57.332629][ T0] secondary_startup_64+0xa4/0xb0 [ 57.337628][ T0] [ 57.339928][ T0] Reported by Kernel Concurrency Sanitizer on: [ 57.346059][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 57.352791][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.362824][ T0] ================================================================== [ 57.370858][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 57.377428][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 57.384159][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.394206][ T0] Call Trace: [ 57.397490][ T0] dump_stack+0xf5/0x159 [ 57.401725][ T0] panic+0x209/0x639 [ 57.405601][ T0] ? x86_64_start_kernel+0x72/0x76 [ 57.410724][ T0] ? vprintk_func+0x8d/0x140 [ 57.415314][ T0] kcsan_report.cold+0xc/0x1b [ 57.420067][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 57.425594][ T0] __tsan_read4+0x2c/0x30 [ 57.429914][ T0] tick_nohz_next_event+0x1a4/0x380 [ 57.435094][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 57.440626][ T0] ? __tsan_read4+0x2c/0x30 [ 57.445107][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 57.451323][ T0] do_idle+0x1e0/0x2c0 [ 57.455377][ T0] cpu_startup_entry+0x1b/0x20 [ 57.460128][ T0] rest_init+0xec/0xf6 [ 57.464178][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 57.471364][ T0] arch_call_rest_init+0x17/0x37 [ 57.476287][ T0] start_kernel+0x83e/0x864 [ 57.480771][ T0] x86_64_start_reservations+0x29/0x2b [ 57.486706][ T0] x86_64_start_kernel+0x72/0x76 [ 57.491624][ T0] secondary_startup_64+0xa4/0xb0 [ 57.498347][ T0] Kernel Offset: disabled [ 57.502668][ T0] Rebooting in 86400 seconds..