[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.130485][ T25] audit: type=1800 audit(1570562589.899:25): pid=7082 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 42.170995][ T25] audit: type=1800 audit(1570562589.899:26): pid=7082 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 42.214742][ T25] audit: type=1800 audit(1570562589.909:27): pid=7082 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 '10.128.0.33' (ECDSA) to the list of known hosts. 2019/10/08 19:23:16 fuzzer started 2019/10/08 19:23:18 dialing manager at 10.128.0.105:35069 2019/10/08 19:23:18 syscalls: 2523 2019/10/08 19:23:18 code coverage: enabled 2019/10/08 19:23:18 comparison tracing: enabled 2019/10/08 19:23:18 extra coverage: extra coverage is not supported by the kernel 2019/10/08 19:23:18 setuid sandbox: enabled 2019/10/08 19:23:18 namespace sandbox: enabled 2019/10/08 19:23:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 19:23:18 fault injection: enabled 2019/10/08 19:23:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 19:23:18 net packet injection: enabled 2019/10/08 19:23:18 net device setup: enabled 2019/10/08 19:23:18 concurrency sanitizer: enabled syzkaller login: [ 51.143384][ T0] ================================================================== [ 51.151631][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 51.160215][ T0] [ 51.162555][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 51.169937][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 51.175482][ T0] do_idle+0x1e0/0x2c0 [ 51.179581][ T0] cpu_startup_entry+0x1b/0x20 [ 51.184336][ T0] start_secondary+0x207/0x260 [ 51.189082][ T0] secondary_startup_64+0xa4/0xb0 [ 51.194088][ T0] [ 51.196403][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 51.203676][ T0] tick_nohz_next_event+0x1a4/0x380 [ 51.208955][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 51.214510][ T0] do_idle+0x1e0/0x2c0 [ 51.218576][ T0] cpu_startup_entry+0x1b/0x20 [ 51.223318][ T0] rest_init+0xec/0xf6 [ 51.227385][ T0] arch_call_rest_init+0x17/0x37 [ 51.232305][ T0] start_kernel+0x83e/0x864 [ 51.236792][ T0] x86_64_start_reservations+0x29/0x2b [ 51.242228][ T0] x86_64_start_kernel+0x72/0x76 [ 51.247160][ T0] secondary_startup_64+0xa4/0xb0 [ 51.252212][ T0] [ 51.254646][ T0] Reported by Kernel Concurrency Sanitizer on: [ 51.260794][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 51.267532][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.277670][ T0] ================================================================== [ 51.285722][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 51.292303][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 51.299045][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.309093][ T0] Call Trace: [ 51.312372][ T0] dump_stack+0xf5/0x159 [ 51.316598][ T0] panic+0x209/0x639 [ 51.320476][ T0] ? x86_64_start_kernel+0x72/0x76 [ 51.325590][ T0] ? vprintk_func+0x8d/0x140 [ 51.330172][ T0] kcsan_report.cold+0xc/0x1b [ 51.334828][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 51.340350][ T0] __tsan_read4+0x2c/0x30 [ 51.344664][ T0] tick_nohz_next_event+0x1a4/0x380 [ 51.349841][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 51.355363][ T0] ? __tsan_read4+0x2c/0x30 [ 51.359890][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.366121][ T0] do_idle+0x1e0/0x2c0 [ 51.370188][ T0] cpu_startup_entry+0x1b/0x20 [ 51.374988][ T0] rest_init+0xec/0xf6 [ 51.379046][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 51.386227][ T0] arch_call_rest_init+0x17/0x37 [ 51.391192][ T0] start_kernel+0x83e/0x864 [ 51.395686][ T0] x86_64_start_reservations+0x29/0x2b [ 51.401122][ T0] x86_64_start_kernel+0x72/0x76 [ 51.406037][ T0] secondary_startup_64+0xa4/0xb0 [ 51.412522][ T0] Kernel Offset: disabled [ 51.417019][ T0] Rebooting in 86400 seconds..