[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.215331][ T26] audit: type=1800 audit(1571280145.694:25): pid=7038 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.251532][ T26] audit: type=1800 audit(1571280145.694:26): pid=7038 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.271829][ T26] audit: type=1800 audit(1571280145.694:27): pid=7038 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 '10.128.0.172' (ECDSA) to the list of known hosts. 2019/10/17 02:42:33 fuzzer started 2019/10/17 02:42:35 dialing manager at 10.128.0.105:33899 2019/10/17 02:42:35 syscalls: 2524 2019/10/17 02:42:35 code coverage: enabled 2019/10/17 02:42:35 comparison tracing: enabled 2019/10/17 02:42:35 extra coverage: extra coverage is not supported by the kernel 2019/10/17 02:42:35 setuid sandbox: enabled 2019/10/17 02:42:35 namespace sandbox: enabled 2019/10/17 02:42:35 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 02:42:35 fault injection: enabled 2019/10/17 02:42:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 02:42:35 net packet injection: enabled 2019/10/17 02:42:35 net device setup: enabled 2019/10/17 02:42:35 concurrency sanitizer: enabled syzkaller login: [ 42.761010][ T0] ================================================================== [ 42.769128][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 42.777683][ T0] [ 42.779989][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 42.787247][ T0] tick_nohz_next_event+0x1a4/0x380 [ 42.792419][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 42.797939][ T0] do_idle+0x1a5/0x280 [ 42.801984][ T0] cpu_startup_entry+0x1b/0x20 [ 42.806720][ T0] start_secondary+0x208/0x260 [ 42.811460][ T0] secondary_startup_64+0xa4/0xb0 [ 42.816453][ T0] [ 42.818757][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 42.826138][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 42.831679][ T0] do_idle+0x1a5/0x280 [ 42.835760][ T0] cpu_startup_entry+0x1b/0x20 [ 42.840498][ T0] rest_init+0xec/0xf6 [ 42.844541][ T0] arch_call_rest_init+0x17/0x37 [ 42.849490][ T0] start_kernel+0x838/0x85e [ 42.853971][ T0] x86_64_start_reservations+0x29/0x2b [ 42.859405][ T0] x86_64_start_kernel+0x72/0x76 [ 42.864316][ T0] secondary_startup_64+0xa4/0xb0 [ 42.869321][ T0] [ 42.871624][ T0] Reported by Kernel Concurrency Sanitizer on: [ 42.877763][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 42.884855][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.894888][ T0] ================================================================== [ 42.902923][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 42.909497][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 42.916583][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.926610][ T0] Call Trace: [ 42.929878][ T0] dump_stack+0xf5/0x159 [ 42.934099][ T0] panic+0x210/0x640 [ 42.938102][ T0] ? secondary_startup_64+0xa4/0xb0 [ 42.943279][ T0] ? vprintk_func+0x8d/0x140 [ 42.947846][ T0] kcsan_report.cold+0xc/0x1b [ 42.952498][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 42.958023][ T0] __tsan_write4+0x32/0x40 [ 42.962416][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 42.967949][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.974177][ T0] do_idle+0x1a5/0x280 [ 42.978224][ T0] cpu_startup_entry+0x1b/0x20 [ 42.982970][ T0] rest_init+0xec/0xf6 [ 42.987027][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 42.994283][ T0] arch_call_rest_init+0x17/0x37 [ 42.999301][ T0] start_kernel+0x838/0x85e [ 43.003782][ T0] x86_64_start_reservations+0x29/0x2b [ 43.009213][ T0] x86_64_start_kernel+0x72/0x76 [ 43.014129][ T0] secondary_startup_64+0xa4/0xb0 [ 43.020374][ T0] Kernel Offset: disabled [ 43.024704][ T0] Rebooting in 86400 seconds..