[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 32.775804][ T25] audit: type=1800 audit(1571322553.641:25): pid=7025 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 32.812008][ T25] audit: type=1800 audit(1571322553.641:26): pid=7025 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 32.835743][ T25] audit: type=1800 audit(1571322553.641:27): pid=7025 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 '10.128.1.34' (ECDSA) to the list of known hosts. 2019/10/17 14:29:24 fuzzer started 2019/10/17 14:29:26 dialing manager at 10.128.0.105:33899 2019/10/17 14:29:26 syscalls: 2524 2019/10/17 14:29:26 code coverage: enabled 2019/10/17 14:29:26 comparison tracing: enabled 2019/10/17 14:29:26 extra coverage: extra coverage is not supported by the kernel 2019/10/17 14:29:26 setuid sandbox: enabled 2019/10/17 14:29:26 namespace sandbox: enabled 2019/10/17 14:29:26 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 14:29:26 fault injection: enabled 2019/10/17 14:29:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 14:29:26 net packet injection: enabled 2019/10/17 14:29:26 net device setup: enabled 2019/10/17 14:29:26 concurrency sanitizer: enabled syzkaller login: [ 45.712079][ T0] ================================================================== [ 45.720366][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 45.728955][ T0] [ 45.731261][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 45.739319][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 45.744844][ T0] do_idle+0x1a5/0x280 [ 45.748894][ T0] cpu_startup_entry+0x1b/0x20 [ 45.753637][ T0] rest_init+0xec/0xf6 [ 45.757706][ T0] arch_call_rest_init+0x17/0x37 [ 45.762617][ T0] start_kernel+0x838/0x85e [ 45.767095][ T0] x86_64_start_reservations+0x29/0x2b [ 45.772549][ T0] x86_64_start_kernel+0x72/0x76 [ 45.777462][ T0] secondary_startup_64+0xa4/0xb0 [ 45.782634][ T0] [ 45.784944][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 45.792205][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.797480][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.803018][ T0] do_idle+0x1a5/0x280 [ 45.807066][ T0] cpu_startup_entry+0x1b/0x20 [ 45.811810][ T0] start_secondary+0x208/0x260 [ 45.816563][ T0] secondary_startup_64+0xa4/0xb0 [ 45.821555][ T0] [ 45.823858][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.830009][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 45.837096][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.847150][ T0] ================================================================== [ 45.855187][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.861758][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 45.868845][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.878884][ T0] Call Trace: [ 45.882155][ T0] dump_stack+0xf5/0x159 [ 45.886384][ T0] panic+0x210/0x640 [ 45.890260][ T0] ? vprintk_func+0x8d/0x140 [ 45.894836][ T0] kcsan_report.cold+0xc/0x1b [ 45.899491][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.905011][ T0] __tsan_read4+0x2c/0x30 [ 45.909421][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.914610][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.920133][ T0] ? __tsan_read4+0x2c/0x30 [ 45.924701][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.930920][ T0] do_idle+0x1a5/0x280 [ 45.934978][ T0] cpu_startup_entry+0x1b/0x20 [ 45.939734][ T0] start_secondary+0x208/0x260 [ 45.944485][ T0] secondary_startup_64+0xa4/0xb0 [ 45.953562][ T0] Kernel Offset: disabled [ 45.958067][ T0] Rebooting in 86400 seconds..