[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.693693][ T25] audit: type=1800 audit(1571083316.594:25): pid=7078 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.721001][ T25] audit: type=1800 audit(1571083316.594:26): pid=7078 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.765353][ T25] audit: type=1800 audit(1571083316.594:27): pid=7078 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 '10.128.10.12' (ECDSA) to the list of known hosts. 2019/10/14 20:02:03 fuzzer started 2019/10/14 20:02:05 dialing manager at 10.128.0.105:43961 2019/10/14 20:02:05 syscalls: 2523 2019/10/14 20:02:05 code coverage: enabled 2019/10/14 20:02:05 comparison tracing: enabled 2019/10/14 20:02:05 extra coverage: extra coverage is not supported by the kernel 2019/10/14 20:02:05 setuid sandbox: enabled 2019/10/14 20:02:05 namespace sandbox: enabled 2019/10/14 20:02:05 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 20:02:05 fault injection: enabled 2019/10/14 20:02:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 20:02:05 net packet injection: enabled 2019/10/14 20:02:05 net device setup: enabled 2019/10/14 20:02:05 concurrency sanitizer: enabled syzkaller login: [ 45.169683][ T0] ================================================================== [ 45.177831][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 45.185970][ T0] [ 45.188306][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 45.195934][ T0] tick_sched_do_timer+0xc0/0xe0 [ 45.200869][ T0] tick_sched_timer+0x43/0xe0 [ 45.205545][ T0] __hrtimer_run_queues+0x288/0x600 [ 45.210742][ T0] hrtimer_interrupt+0x22a/0x480 [ 45.215676][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.221132][ T0] apic_timer_interrupt+0xf/0x20 [ 45.226062][ T0] __kcsan_setup_watchpoint+0x282/0x510 [ 45.232731][ T0] __tsan_read8+0x2c/0x30 [ 45.237059][ T0] nf_ct_seq_offset+0x2e/0xd0 [ 45.241740][ T0] nf_conntrack_tcp_packet+0x5d9/0x3390 [ 45.247286][ T0] nf_conntrack_in+0x410/0xaa0 [ 45.252046][ T0] ipv4_conntrack_in+0x27/0x40 [ 45.256810][ T0] nf_hook_slow+0x83/0x160 [ 45.261223][ T0] ip_rcv+0x12f/0x1a0 [ 45.265193][ T0] [ 45.267513][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 45.274789][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.279982][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.285522][ T0] do_idle+0x1e0/0x2c0 [ 45.289602][ T0] cpu_startup_entry+0x1b/0x20 [ 45.294356][ T0] start_secondary+0x207/0x260 [ 45.299103][ T0] secondary_startup_64+0xa4/0xb0 [ 45.304107][ T0] [ 45.306422][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.312607][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 45.319350][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.329388][ T0] ================================================================== [ 45.337425][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.344009][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 45.350762][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.360811][ T0] Call Trace: [ 45.364089][ T0] dump_stack+0xf5/0x159 [ 45.368320][ T0] panic+0x209/0x639 [ 45.372213][ T0] ? vprintk_func+0x8d/0x140 [ 45.376790][ T0] kcsan_report.cold+0xc/0x1b [ 45.381450][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.387074][ T0] __tsan_read4+0x2c/0x30 [ 45.391393][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.396602][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.402137][ T0] ? __tsan_read4+0x2c/0x30 [ 45.406630][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.412865][ T0] do_idle+0x1e0/0x2c0 [ 45.416936][ T0] ? complete+0x44/0x50 [ 45.421081][ T0] cpu_startup_entry+0x1b/0x20 [ 45.425837][ T0] start_secondary+0x207/0x260 [ 45.430594][ T0] secondary_startup_64+0xa4/0xb0 [ 45.436788][ T0] Kernel Offset: disabled [ 45.441106][ T0] Rebooting in 86400 seconds..