[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.392294][ T25] audit: type=1800 audit(1571663387.175:25): pid=7064 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.419801][ T25] audit: type=1800 audit(1571663387.175:26): pid=7064 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.446760][ T25] audit: type=1800 audit(1571663387.175:27): pid=7064 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 '10.128.15.220' (ECDSA) to the list of known hosts. 2019/10/21 13:09:59 fuzzer started 2019/10/21 13:10:01 dialing manager at 10.128.0.105:39747 2019/10/21 13:10:01 syscalls: 2524 2019/10/21 13:10:01 code coverage: enabled 2019/10/21 13:10:01 comparison tracing: enabled 2019/10/21 13:10:01 extra coverage: extra coverage is not supported by the kernel 2019/10/21 13:10:01 setuid sandbox: enabled 2019/10/21 13:10:01 namespace sandbox: enabled 2019/10/21 13:10:01 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 13:10:01 fault injection: enabled 2019/10/21 13:10:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 13:10:01 net packet injection: enabled 2019/10/21 13:10:01 net device setup: enabled 2019/10/21 13:10:01 concurrency sanitizer: enabled syzkaller login: [ 53.099107][ T0] ================================================================== [ 53.107381][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 53.118800][ T0] [ 53.121129][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 53.128388][ T0] tick_nohz_next_event+0x1a4/0x380 [ 53.133664][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 53.139225][ T0] do_idle+0x1a5/0x280 [ 53.143628][ T0] cpu_startup_entry+0x1b/0x20 [ 53.148554][ T0] rest_init+0xec/0xf6 [ 53.152608][ T0] arch_call_rest_init+0x17/0x37 [ 53.157653][ T0] start_kernel+0x838/0x85e [ 53.162134][ T0] x86_64_start_reservations+0x29/0x2b [ 53.167713][ T0] x86_64_start_kernel+0x72/0x76 [ 53.172645][ T0] secondary_startup_64+0xa4/0xb0 [ 53.177642][ T0] [ 53.179955][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 53.187320][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 53.193020][ T0] do_idle+0x1a5/0x280 [ 53.197063][ T0] cpu_startup_entry+0x1b/0x20 [ 53.201803][ T0] start_secondary+0x208/0x260 [ 53.206554][ T0] secondary_startup_64+0xa4/0xb0 [ 53.211569][ T0] [ 53.213873][ T0] Reported by Kernel Concurrency Sanitizer on: [ 53.220015][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 53.227092][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.237122][ T0] ================================================================== [ 53.245162][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 53.251735][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 53.258955][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.269003][ T0] Call Trace: [ 53.272282][ T0] dump_stack+0xf5/0x159 [ 53.276515][ T0] panic+0x210/0x640 [ 53.280387][ T0] ? vprintk_func+0x8d/0x140 [ 53.284962][ T0] kcsan_report.cold+0xc/0x10 [ 53.289626][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 53.295159][ T0] __tsan_write4+0x32/0x40 [ 53.299570][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 53.305092][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.311309][ T0] do_idle+0x1a5/0x280 [ 53.315453][ T0] cpu_startup_entry+0x1b/0x20 [ 53.320195][ T0] start_secondary+0x208/0x260 [ 53.324940][ T0] secondary_startup_64+0xa4/0xb0 [ 53.331514][ T0] Kernel Offset: disabled [ 53.335849][ T0] Rebooting in 86400 seconds..