[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.185778][ T23] audit: type=1800 audit(1571514605.304:25): pid=7046 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.232046][ T23] audit: type=1800 audit(1571514605.304:26): pid=7046 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.253271][ T23] audit: type=1800 audit(1571514605.304:27): pid=7046 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 '10.128.0.111' (ECDSA) to the list of known hosts. 2019/10/19 19:50:13 fuzzer started 2019/10/19 19:50:15 dialing manager at 10.128.0.105:43535 2019/10/19 19:50:15 syscalls: 2524 2019/10/19 19:50:15 code coverage: enabled 2019/10/19 19:50:15 comparison tracing: enabled 2019/10/19 19:50:15 extra coverage: extra coverage is not supported by the kernel 2019/10/19 19:50:15 setuid sandbox: enabled 2019/10/19 19:50:15 namespace sandbox: enabled 2019/10/19 19:50:15 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/19 19:50:15 fault injection: enabled 2019/10/19 19:50:15 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/19 19:50:15 net packet injection: enabled 2019/10/19 19:50:15 net device setup: enabled 2019/10/19 19:50:15 concurrency sanitizer: enabled syzkaller login: [ 45.251535][ T0] ================================================================== [ 45.259646][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 45.268203][ T0] [ 45.270511][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 45.277972][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 45.283493][ T0] do_idle+0x1a5/0x280 [ 45.287551][ T0] cpu_startup_entry+0x1b/0x20 [ 45.292292][ T0] start_secondary+0x208/0x260 [ 45.297031][ T0] secondary_startup_64+0xa4/0xb0 [ 45.302022][ T0] [ 45.304328][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 45.311598][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.316774][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.322296][ T0] do_idle+0x1a5/0x280 [ 45.326341][ T0] cpu_startup_entry+0x1b/0x20 [ 45.331080][ T0] rest_init+0xec/0xf6 [ 45.335127][ T0] arch_call_rest_init+0x17/0x37 [ 45.340055][ T0] start_kernel+0x838/0x85e [ 45.344532][ T0] x86_64_start_reservations+0x29/0x2b [ 45.349965][ T0] x86_64_start_kernel+0x72/0x76 [ 45.354892][ T0] secondary_startup_64+0xa4/0xb0 [ 45.359884][ T0] [ 45.362188][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.368320][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 45.375420][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.385462][ T0] ================================================================== [ 45.393497][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.400151][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 45.407229][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.417260][ T0] Call Trace: [ 45.420536][ T0] dump_stack+0xf5/0x159 [ 45.424771][ T0] panic+0x210/0x640 [ 45.428645][ T0] ? x86_64_start_kernel+0x72/0x76 [ 45.433732][ T0] ? vprintk_func+0x8d/0x140 [ 45.438301][ T0] kcsan_report.cold+0xc/0x10 [ 45.442959][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.448491][ T0] __tsan_read4+0x2c/0x30 [ 45.452837][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.458024][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.463557][ T0] ? __tsan_read4+0x2c/0x30 [ 45.468037][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.474255][ T0] do_idle+0x1a5/0x280 [ 45.478304][ T0] cpu_startup_entry+0x1b/0x20 [ 45.483044][ T0] rest_init+0xec/0xf6 [ 45.487097][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 45.494277][ T0] arch_call_rest_init+0x17/0x37 [ 45.499190][ T0] start_kernel+0x838/0x85e [ 45.503675][ T0] x86_64_start_reservations+0x29/0x2b [ 45.509196][ T0] x86_64_start_kernel+0x72/0x76 [ 45.514131][ T0] secondary_startup_64+0xa4/0xb0 [ 45.520486][ T0] Kernel Offset: disabled [ 45.524822][ T0] Rebooting in 86400 seconds..