[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.955600][ T25] audit: type=1800 audit(1570493564.260:25): pid=7020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.983086][ T25] audit: type=1800 audit(1570493564.270:26): pid=7020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 42.021151][ T25] audit: type=1800 audit(1570493564.270:27): pid=7020 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 '10.128.0.61' (ECDSA) to the list of known hosts. 2019/10/08 00:12:55 fuzzer started 2019/10/08 00:12:57 dialing manager at 10.128.0.105:39369 2019/10/08 00:12:57 syscalls: 2523 2019/10/08 00:12:57 code coverage: enabled 2019/10/08 00:12:57 comparison tracing: enabled 2019/10/08 00:12:57 extra coverage: extra coverage is not supported by the kernel 2019/10/08 00:12:57 setuid sandbox: enabled 2019/10/08 00:12:57 namespace sandbox: enabled 2019/10/08 00:12:57 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 00:12:57 fault injection: enabled 2019/10/08 00:12:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 00:12:57 net packet injection: enabled 2019/10/08 00:12:57 net device setup: enabled 2019/10/08 00:12:57 concurrency sanitizer: enabled syzkaller login: [ 54.981066][ T0] ================================================================== [ 54.990261][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 54.998829][ T0] [ 55.001148][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 0: [ 55.008494][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 55.014012][ T0] do_idle+0x1e0/0x2c0 [ 55.018057][ T0] cpu_startup_entry+0x1b/0x20 [ 55.022797][ T0] rest_init+0xec/0xf6 [ 55.026846][ T0] arch_call_rest_init+0x17/0x37 [ 55.031766][ T0] start_kernel+0x83e/0x864 [ 55.036263][ T0] x86_64_start_reservations+0x29/0x2b [ 55.041708][ T0] x86_64_start_kernel+0x72/0x76 [ 55.046619][ T0] secondary_startup_64+0xa4/0xb0 [ 55.051610][ T0] [ 55.053914][ T0] read to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 55.061180][ T0] tick_nohz_next_event+0x1a4/0x380 [ 55.066366][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 55.071901][ T0] do_idle+0x1e0/0x2c0 [ 55.075954][ T0] cpu_startup_entry+0x1b/0x20 [ 55.080695][ T0] start_secondary+0x207/0x260 [ 55.085433][ T0] secondary_startup_64+0xa4/0xb0 [ 55.090435][ T0] [ 55.092742][ T0] Reported by Kernel Concurrency Sanitizer on: [ 55.098888][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 55.105618][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.115653][ T0] ================================================================== [ 55.123698][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 55.130345][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 55.137162][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.147201][ T0] Call Trace: [ 55.150505][ T0] dump_stack+0xf5/0x159 [ 55.154901][ T0] panic+0x209/0x639 [ 55.158778][ T0] ? vprintk_func+0x8d/0x140 [ 55.163350][ T0] kcsan_report.cold+0x57/0xeb [ 55.168091][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 55.173612][ T0] __tsan_read4+0x2c/0x30 [ 55.177925][ T0] tick_nohz_next_event+0x1a4/0x380 [ 55.183112][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 55.188633][ T0] ? __tsan_read4+0x2c/0x30 [ 55.193113][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.199464][ T0] do_idle+0x1e0/0x2c0 [ 55.203511][ T0] ? complete+0x44/0x50 [ 55.207645][ T0] cpu_startup_entry+0x1b/0x20 [ 55.212396][ T0] start_secondary+0x207/0x260 [ 55.217157][ T0] secondary_startup_64+0xa4/0xb0 [ 55.223580][ T0] Kernel Offset: disabled [ 55.228167][ T0] Rebooting in 86400 seconds..