[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.249621][ T26] audit: type=1800 audit(1571691120.099:25): pid=7065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.286209][ T26] audit: type=1800 audit(1571691120.099:26): pid=7065 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 39.323293][ T26] audit: type=1800 audit(1571691120.099:27): pid=7065 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 '10.128.0.73' (ECDSA) to the list of known hosts. 2019/10/21 20:52:10 fuzzer started 2019/10/21 20:52:12 dialing manager at 10.128.0.105:39747 2019/10/21 20:52:12 syscalls: 2524 2019/10/21 20:52:12 code coverage: enabled 2019/10/21 20:52:12 comparison tracing: enabled 2019/10/21 20:52:12 extra coverage: extra coverage is not supported by the kernel 2019/10/21 20:52:12 setuid sandbox: enabled 2019/10/21 20:52:12 namespace sandbox: enabled 2019/10/21 20:52:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 20:52:12 fault injection: enabled 2019/10/21 20:52:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 20:52:12 net packet injection: enabled 2019/10/21 20:52:12 net device setup: enabled 2019/10/21 20:52:12 concurrency sanitizer: enabled syzkaller login: [ 52.922590][ T0] ================================================================== [ 52.930828][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 52.939382][ T0] [ 52.941755][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 52.949015][ T0] tick_nohz_next_event+0x1a4/0x380 [ 52.954213][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 52.959772][ T0] do_idle+0x1a5/0x280 [ 52.963818][ T0] cpu_startup_entry+0x1b/0x20 [ 52.968574][ T0] start_secondary+0x208/0x260 [ 52.973336][ T0] secondary_startup_64+0xa4/0xb0 [ 52.978343][ T0] [ 52.980670][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 52.988053][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 52.993594][ T0] do_idle+0x1a5/0x280 [ 52.997659][ T0] cpu_startup_entry+0x1b/0x20 [ 53.002421][ T0] rest_init+0xec/0xf6 [ 53.006492][ T0] arch_call_rest_init+0x17/0x37 [ 53.011416][ T0] start_kernel+0x838/0x85e [ 53.015916][ T0] x86_64_start_reservations+0x29/0x2b [ 53.021370][ T0] x86_64_start_kernel+0x72/0x76 [ 53.026299][ T0] secondary_startup_64+0xa4/0xb0 [ 53.031307][ T0] [ 53.033624][ T0] Reported by Kernel Concurrency Sanitizer on: [ 53.039772][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 53.046865][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.056905][ T0] ================================================================== [ 53.064960][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 53.071543][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 53.078637][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.088701][ T0] Call Trace: [ 53.092009][ T0] dump_stack+0xf5/0x159 [ 53.096252][ T0] panic+0x210/0x640 [ 53.100162][ T0] ? secondary_startup_64+0xa4/0xb0 [ 53.105363][ T0] ? vprintk_func+0x8d/0x140 [ 53.109941][ T0] kcsan_report.cold+0xc/0x10 [ 53.114605][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 53.120133][ T0] __tsan_write4+0x32/0x40 [ 53.124540][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 53.130086][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.136321][ T0] do_idle+0x1a5/0x280 [ 53.140377][ T0] cpu_startup_entry+0x1b/0x20 [ 53.145125][ T0] rest_init+0xec/0xf6 [ 53.149179][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 53.156365][ T0] arch_call_rest_init+0x17/0x37 [ 53.161300][ T0] start_kernel+0x838/0x85e [ 53.165806][ T0] x86_64_start_reservations+0x29/0x2b [ 53.171263][ T0] x86_64_start_kernel+0x72/0x76 [ 53.176198][ T0] secondary_startup_64+0xa4/0xb0 [ 53.182665][ T0] Kernel Offset: disabled [ 53.186983][ T0] Rebooting in 86400 seconds..