[ 36.348602][ T25] audit: type=1800 audit(1570237975.263:24): pid=7148 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.785309][ T25] audit: type=1800 audit(1570237975.773:25): pid=7148 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.824560][ T25] audit: type=1800 audit(1570237975.773:26): pid=7148 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.10.24' (ECDSA) to the list of known hosts. 2019/10/05 01:13:05 fuzzer started 2019/10/05 01:13:07 dialing manager at 10.128.0.105:44881 2019/10/05 01:13:07 syscalls: 2523 2019/10/05 01:13:07 code coverage: enabled 2019/10/05 01:13:07 comparison tracing: enabled 2019/10/05 01:13:07 extra coverage: extra coverage is not supported by the kernel 2019/10/05 01:13:07 setuid sandbox: enabled 2019/10/05 01:13:07 namespace sandbox: enabled 2019/10/05 01:13:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/05 01:13:07 fault injection: enabled 2019/10/05 01:13:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/05 01:13:07 net packet injection: enabled 2019/10/05 01:13:07 net device setup: enabled 2019/10/05 01:13:07 concurrency sanitizer: enabled syzkaller login: [ 50.544909][ T0] ================================================================== [ 50.553102][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 50.561656][ T0] [ 50.563961][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 50.571307][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 50.576826][ T0] do_idle+0x1e0/0x2c0 [ 50.580891][ T0] cpu_startup_entry+0x1b/0x20 [ 50.585631][ T0] start_secondary+0x207/0x260 [ 50.590370][ T0] secondary_startup_64+0xa4/0xb0 [ 50.595360][ T0] [ 50.597667][ T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0: [ 50.604939][ T0] tick_nohz_next_event+0x1a4/0x380 [ 50.610112][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 50.615628][ T0] do_idle+0x1e0/0x2c0 [ 50.619671][ T0] cpu_startup_entry+0x1b/0x20 [ 50.624408][ T0] rest_init+0xec/0xf6 [ 50.628454][ T0] arch_call_rest_init+0x17/0x37 [ 50.633368][ T0] start_kernel+0x83e/0x864 [ 50.637845][ T0] x86_64_start_reservations+0x29/0x2b [ 50.643277][ T0] x86_64_start_kernel+0x72/0x76 [ 50.648235][ T0] secondary_startup_64+0xa4/0xb0 [ 50.653227][ T0] [ 50.655568][ T0] Reported by Kernel Concurrency Sanitizer on: [ 50.661696][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 50.668450][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.678491][ T0] ================================================================== [ 50.686524][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 50.693101][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 50.699830][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.709854][ T0] Call Trace: [ 50.713123][ T0] dump_stack+0xf5/0x159 [ 50.717343][ T0] panic+0x209/0x639 [ 50.721215][ T0] ? vprintk_func+0x8d/0x140 [ 50.725781][ T0] kcsan_report.cold+0x57/0xeb [ 50.730551][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 50.736079][ T0] __tsan_read4+0x2c/0x30 [ 50.740386][ T0] tick_nohz_next_event+0x1a4/0x380 [ 50.745587][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 50.751110][ T0] ? __tsan_read4+0x2c/0x30 [ 50.755594][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.761809][ T0] do_idle+0x1e0/0x2c0 [ 50.765856][ T0] cpu_startup_entry+0x1b/0x20 [ 50.770594][ T0] rest_init+0xec/0xf6 [ 50.774641][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 50.781832][ T0] arch_call_rest_init+0x17/0x37 [ 50.786743][ T0] start_kernel+0x83e/0x864 [ 50.791223][ T0] x86_64_start_reservations+0x29/0x2b [ 50.796671][ T0] x86_64_start_kernel+0x72/0x76 [ 50.801583][ T0] secondary_startup_64+0xa4/0xb0 [ 50.807938][ T0] Kernel Offset: disabled [ 50.812260][ T0] Rebooting in 86400 seconds..