[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.806777][ T25] audit: type=1800 audit(1570373553.643:25): pid=7016 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.842488][ T25] audit: type=1800 audit(1570373553.643:26): pid=7016 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.862784][ T25] audit: type=1800 audit(1570373553.643:27): pid=7016 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 '10.128.0.10' (ECDSA) to the list of known hosts. 2019/10/06 14:52:40 fuzzer started 2019/10/06 14:52:42 dialing manager at 10.128.0.105:35709 2019/10/06 14:52:42 syscalls: 2523 2019/10/06 14:52:42 code coverage: enabled 2019/10/06 14:52:42 comparison tracing: enabled 2019/10/06 14:52:42 extra coverage: extra coverage is not supported by the kernel 2019/10/06 14:52:42 setuid sandbox: enabled 2019/10/06 14:52:42 namespace sandbox: enabled 2019/10/06 14:52:42 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/06 14:52:42 fault injection: enabled 2019/10/06 14:52:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/06 14:52:42 net packet injection: enabled 2019/10/06 14:52:42 net device setup: enabled 2019/10/06 14:52:42 concurrency sanitizer: enabled syzkaller login: [ 43.481926][ T0] ================================================================== [ 43.490154][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 43.499166][ T0] [ 43.501469][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0: [ 43.508810][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 43.514455][ T0] do_idle+0x1e0/0x2c0 [ 43.518621][ T0] cpu_startup_entry+0x1b/0x20 [ 43.523367][ T0] rest_init+0xec/0xf6 [ 43.527426][ T0] arch_call_rest_init+0x17/0x37 [ 43.532342][ T0] start_kernel+0x83e/0x864 [ 43.536824][ T0] x86_64_start_reservations+0x29/0x2b [ 43.542343][ T0] x86_64_start_kernel+0x72/0x76 [ 43.547255][ T0] secondary_startup_64+0xa4/0xb0 [ 43.552247][ T0] [ 43.554553][ T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 43.561809][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 43.567327][ T0] do_idle+0x1e0/0x2c0 [ 43.571375][ T0] cpu_startup_entry+0x1b/0x20 [ 43.576113][ T0] start_secondary+0x207/0x260 [ 43.580849][ T0] secondary_startup_64+0xa4/0xb0 [ 43.585842][ T0] [ 43.588142][ T0] Reported by Kernel Concurrency Sanitizer on: [ 43.594301][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 43.601040][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.611072][ T0] ================================================================== [ 43.619188][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 43.625748][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 43.632477][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.642515][ T0] Call Trace: [ 43.645781][ T0] dump_stack+0xf5/0x159 [ 43.649998][ T0] panic+0x209/0x639 [ 43.653869][ T0] ? vprintk_func+0x8d/0x140 [ 43.658438][ T0] kcsan_report.cold+0x57/0xeb [ 43.663192][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 43.668810][ T0] __tsan_read4+0x2c/0x30 [ 43.673134][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 43.678655][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.684869][ T0] do_idle+0x1e0/0x2c0 [ 43.688917][ T0] ? complete+0x44/0x50 [ 43.693058][ T0] cpu_startup_entry+0x1b/0x20 [ 43.697798][ T0] start_secondary+0x207/0x260 [ 43.702538][ T0] secondary_startup_64+0xa4/0xb0 [ 43.708787][ T0] Kernel Offset: disabled [ 43.713103][ T0] Rebooting in 86400 seconds..