[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.805653][ T26] audit: type=1800 audit(1571673804.110:25): pid=7066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.832832][ T26] audit: type=1800 audit(1571673804.110:26): pid=7066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.864540][ T26] audit: type=1800 audit(1571673804.120:27): pid=7066 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 '10.128.0.9' (ECDSA) to the list of known hosts. 2019/10/21 16:03:31 fuzzer started 2019/10/21 16:03:32 dialing manager at 10.128.0.105:39747 2019/10/21 16:03:32 syscalls: 2524 2019/10/21 16:03:32 code coverage: enabled 2019/10/21 16:03:32 comparison tracing: enabled 2019/10/21 16:03:32 extra coverage: extra coverage is not supported by the kernel 2019/10/21 16:03:32 setuid sandbox: enabled 2019/10/21 16:03:32 namespace sandbox: enabled 2019/10/21 16:03:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 16:03:32 fault injection: enabled 2019/10/21 16:03:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 16:03:32 net packet injection: enabled 2019/10/21 16:03:32 net device setup: enabled 2019/10/21 16:03:32 concurrency sanitizer: enabled syzkaller login: [ 42.550223][ T0] ================================================================== [ 42.558339][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 42.567283][ T0] [ 42.569594][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 42.576941][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 42.582503][ T0] do_idle+0x1a5/0x280 [ 42.586718][ T0] cpu_startup_entry+0x1b/0x20 [ 42.591473][ T0] start_secondary+0x208/0x260 [ 42.596216][ T0] secondary_startup_64+0xa4/0xb0 [ 42.601260][ T0] [ 42.603572][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 42.610831][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 42.616351][ T0] do_idle+0x1a5/0x280 [ 42.620395][ T0] cpu_startup_entry+0x1b/0x20 [ 42.625150][ T0] rest_init+0xec/0xf6 [ 42.629195][ T0] arch_call_rest_init+0x17/0x37 [ 42.634114][ T0] start_kernel+0x838/0x85e [ 42.638603][ T0] x86_64_start_reservations+0x29/0x2b [ 42.644036][ T0] x86_64_start_kernel+0x72/0x76 [ 42.648960][ T0] secondary_startup_64+0xa4/0xb0 [ 42.653955][ T0] [ 42.656254][ T0] Reported by Kernel Concurrency Sanitizer on: [ 42.662382][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 42.669460][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.679498][ T0] ================================================================== [ 42.687532][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 42.694098][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 42.701176][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.711206][ T0] Call Trace: [ 42.714485][ T0] dump_stack+0xf5/0x159 [ 42.718716][ T0] panic+0x210/0x640 [ 42.722589][ T0] ? secondary_startup_64+0xa4/0xb0 [ 42.727764][ T0] ? vprintk_func+0x8d/0x140 [ 42.732335][ T0] kcsan_report.cold+0xc/0x10 [ 42.736990][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 42.742968][ T0] __tsan_read4+0x2c/0x30 [ 42.747303][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 42.752840][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.759069][ T0] do_idle+0x1a5/0x280 [ 42.763133][ T0] cpu_startup_entry+0x1b/0x20 [ 42.767906][ T0] rest_init+0xec/0xf6 [ 42.772158][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 42.779330][ T0] arch_call_rest_init+0x17/0x37 [ 42.784245][ T0] start_kernel+0x838/0x85e [ 42.788741][ T0] x86_64_start_reservations+0x29/0x2b [ 42.794370][ T0] x86_64_start_kernel+0x72/0x76 [ 42.799305][ T0] secondary_startup_64+0xa4/0xb0 [ 42.805903][ T0] Kernel Offset: disabled [ 42.810240][ T0] Rebooting in 86400 seconds..