[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.121470][ T25] audit: type=1800 audit(1571233168.415:25): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.148684][ T25] audit: type=1800 audit(1571233168.415:26): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.175621][ T25] audit: type=1800 audit(1571233168.415:27): pid=7042 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 '10.128.0.170' (ECDSA) to the list of known hosts. 2019/10/16 13:39:35 fuzzer started 2019/10/16 13:39:36 dialing manager at 10.128.0.105:37551 2019/10/16 13:39:36 syscalls: 2524 2019/10/16 13:39:36 code coverage: enabled 2019/10/16 13:39:36 comparison tracing: enabled 2019/10/16 13:39:36 extra coverage: extra coverage is not supported by the kernel 2019/10/16 13:39:36 setuid sandbox: enabled 2019/10/16 13:39:36 namespace sandbox: enabled 2019/10/16 13:39:36 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 13:39:36 fault injection: enabled 2019/10/16 13:39:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 13:39:36 net packet injection: enabled 2019/10/16 13:39:36 net device setup: enabled 2019/10/16 13:39:36 concurrency sanitizer: enabled syzkaller login: [ 45.693082][ T0] ================================================================== [ 45.701296][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 45.709900][ T0] [ 45.712236][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 45.720896][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.726074][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.731685][ T0] do_idle+0x1a5/0x280 [ 45.735752][ T0] cpu_startup_entry+0x1b/0x20 [ 45.740614][ T0] start_secondary+0x208/0x260 [ 45.745384][ T0] secondary_startup_64+0xa4/0xb0 [ 45.753094][ T0] [ 45.755439][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 45.762909][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 45.768485][ T0] do_idle+0x1a5/0x280 [ 45.773089][ T0] cpu_startup_entry+0x1b/0x20 [ 45.777855][ T0] rest_init+0xec/0xf6 [ 45.781939][ T0] arch_call_rest_init+0x17/0x37 [ 45.786887][ T0] start_kernel+0x838/0x85e [ 45.791506][ T0] x86_64_start_reservations+0x29/0x2b [ 45.797001][ T0] x86_64_start_kernel+0x72/0x76 [ 45.802042][ T0] secondary_startup_64+0xa4/0xb0 [ 45.807068][ T0] [ 45.809391][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.815621][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 45.822915][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.832973][ T0] ================================================================== [ 45.845413][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.852162][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 45.860127][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.870922][ T0] Call Trace: [ 45.875081][ T0] dump_stack+0xf5/0x159 [ 45.879856][ T0] panic+0x210/0x640 [ 45.884196][ T0] ? secondary_startup_64+0xa4/0xb0 [ 45.890774][ T0] ? vprintk_func+0x8d/0x140 [ 45.895545][ T0] kcsan_report.cold+0xc/0x1b [ 45.900341][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.905891][ T0] __tsan_write4+0x32/0x40 [ 45.910663][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 45.917434][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.923940][ T0] do_idle+0x1a5/0x280 [ 45.928811][ T0] cpu_startup_entry+0x1b/0x20 [ 45.933580][ T0] rest_init+0xec/0xf6 [ 45.937673][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 45.945050][ T0] arch_call_rest_init+0x17/0x37 [ 45.950068][ T0] start_kernel+0x838/0x85e [ 45.954596][ T0] x86_64_start_reservations+0x29/0x2b [ 45.961100][ T0] x86_64_start_kernel+0x72/0x76 [ 45.966048][ T0] secondary_startup_64+0xa4/0xb0 [ 45.972468][ T0] Kernel Offset: disabled [ 45.976847][ T0] Rebooting in 86400 seconds..