[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.177507][ T23] audit: type=1800 audit(1570440547.030:25): pid=7058 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.205063][ T23] audit: type=1800 audit(1570440547.030:26): pid=7058 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.243556][ T23] audit: type=1800 audit(1570440547.030:27): pid=7058 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 '10.128.0.233' (ECDSA) to the list of known hosts. 2019/10/07 09:29:14 fuzzer started 2019/10/07 09:29:16 dialing manager at 10.128.0.105:39369 2019/10/07 09:29:16 syscalls: 2523 2019/10/07 09:29:16 code coverage: enabled 2019/10/07 09:29:16 comparison tracing: enabled 2019/10/07 09:29:16 extra coverage: extra coverage is not supported by the kernel 2019/10/07 09:29:16 setuid sandbox: enabled 2019/10/07 09:29:16 namespace sandbox: enabled 2019/10/07 09:29:16 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/07 09:29:16 fault injection: enabled 2019/10/07 09:29:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/07 09:29:16 net packet injection: enabled 2019/10/07 09:29:16 net device setup: enabled 2019/10/07 09:29:16 concurrency sanitizer: enabled syzkaller login: [ 44.032914][ T0] ================================================================== [ 44.041114][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 44.049962][ T0] [ 44.052285][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 44.059657][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 44.065286][ T0] do_idle+0x1e0/0x2c0 [ 44.069511][ T0] cpu_startup_entry+0x1b/0x20 [ 44.074360][ T0] start_secondary+0x207/0x260 [ 44.079110][ T0] secondary_startup_64+0xa4/0xb0 [ 44.084109][ T0] [ 44.086440][ T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0: [ 44.093715][ T0] tick_nohz_next_event+0x1a4/0x380 [ 44.099262][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 44.104790][ T0] do_idle+0x1e0/0x2c0 [ 44.108861][ T0] cpu_startup_entry+0x1b/0x20 [ 44.113619][ T0] rest_init+0xec/0xf6 [ 44.117686][ T0] arch_call_rest_init+0x17/0x37 [ 44.122706][ T0] start_kernel+0x83e/0x864 [ 44.127293][ T0] x86_64_start_reservations+0x29/0x2b [ 44.132742][ T0] x86_64_start_kernel+0x72/0x76 [ 44.137656][ T0] secondary_startup_64+0xa4/0xb0 [ 44.142650][ T0] [ 44.144964][ T0] Reported by Kernel Concurrency Sanitizer on: [ 44.151098][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 44.157833][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.167863][ T0] ================================================================== [ 44.175910][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 44.182474][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 44.189219][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.199261][ T0] Call Trace: [ 44.202536][ T0] dump_stack+0xf5/0x159 [ 44.209462][ T0] panic+0x209/0x639 [ 44.213336][ T0] ? vprintk_func+0x8d/0x140 [ 44.217907][ T0] kcsan_report.cold+0x57/0xeb [ 44.222649][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 44.228246][ T0] __tsan_read4+0x2c/0x30 [ 44.232563][ T0] tick_nohz_next_event+0x1a4/0x380 [ 44.237746][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 44.243274][ T0] ? __tsan_read4+0x2c/0x30 [ 44.247758][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.253977][ T0] do_idle+0x1e0/0x2c0 [ 44.258263][ T0] cpu_startup_entry+0x1b/0x20 [ 44.263020][ T0] rest_init+0xec/0xf6 [ 44.267070][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 44.275034][ T0] arch_call_rest_init+0x17/0x37 [ 44.279946][ T0] start_kernel+0x83e/0x864 [ 44.284430][ T0] x86_64_start_reservations+0x29/0x2b [ 44.289865][ T0] x86_64_start_kernel+0x72/0x76 [ 44.294782][ T0] secondary_startup_64+0xa4/0xb0 [ 44.301209][ T0] Kernel Offset: disabled [ 44.305531][ T0] Rebooting in 86400 seconds..