[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.015585][ T25] audit: type=1800 audit(1570500306.165:25): pid=7075 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.047824][ T25] audit: type=1800 audit(1570500306.165:26): pid=7075 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.072780][ T25] audit: type=1800 audit(1570500306.165:27): pid=7075 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 '10.128.0.95' (ECDSA) to the list of known hosts. 2019/10/08 02:05:15 fuzzer started 2019/10/08 02:05:16 dialing manager at 10.128.0.105:39369 2019/10/08 02:05:17 syscalls: 2523 2019/10/08 02:05:17 code coverage: enabled 2019/10/08 02:05:17 comparison tracing: enabled 2019/10/08 02:05:17 extra coverage: extra coverage is not supported by the kernel 2019/10/08 02:05:17 setuid sandbox: enabled 2019/10/08 02:05:17 namespace sandbox: enabled 2019/10/08 02:05:17 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 02:05:17 fault injection: enabled 2019/10/08 02:05:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 02:05:17 net packet injection: enabled 2019/10/08 02:05:17 net device setup: enabled 2019/10/08 02:05:17 concurrency sanitizer: enabled syzkaller login: [ 48.183483][ T0] ================================================================== [ 48.193600][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 48.202090][ T0] [ 48.204448][ T0] read to 0xffffffff85caf2d0 of 4 bytes by interrupt on cpu 0: [ 48.212092][ T0] tick_sched_do_timer+0x33/0xe0 [ 48.217024][ T0] tick_sched_timer+0x43/0xe0 [ 48.221768][ T0] __hrtimer_run_queues+0x288/0x600 [ 48.226982][ T0] hrtimer_interrupt+0x22a/0x480 [ 48.231978][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 48.237415][ T0] apic_timer_interrupt+0xf/0x20 [ 48.242331][ T0] __kcsan_setup_watchpoint+0x272/0x500 [ 48.247852][ T0] __tsan_read8+0x2c/0x30 [ 48.252165][ T0] __should_failslab+0x29/0x130 [ 48.256994][ T0] should_failslab+0x9/0x14 [ 48.261493][ T0] kmem_cache_alloc_node+0x39/0x660 [ 48.267014][ T0] __alloc_skb+0x8e/0x350 [ 48.271330][ T0] __tcp_send_ack+0x7e/0x300 [ 48.275900][ T0] tcp_send_ack+0x34/0x40 [ 48.280209][ T0] [ 48.282597][ T0] write to 0xffffffff85caf2d0 of 4 bytes by task 0 on cpu 1: [ 48.289979][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 48.295765][ T0] do_idle+0x1e0/0x2c0 [ 48.299822][ T0] cpu_startup_entry+0x1b/0x20 [ 48.304581][ T0] start_secondary+0x207/0x260 [ 48.309323][ T0] secondary_startup_64+0xa4/0xb0 [ 48.314329][ T0] [ 48.316629][ T0] Reported by Kernel Concurrency Sanitizer on: [ 48.322765][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 48.329943][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.339976][ T0] ================================================================== [ 48.348022][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 48.354587][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 48.361319][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.371359][ T0] Call Trace: [ 48.374647][ T0] dump_stack+0xf5/0x159 [ 48.378903][ T0] panic+0x209/0x639 [ 48.382799][ T0] ? vprintk_func+0x8d/0x140 [ 48.387390][ T0] kcsan_report.cold+0x57/0xeb [ 48.392137][ T0] __kcsan_setup_watchpoint+0x342/0x500 [ 48.397670][ T0] __tsan_write4+0x32/0x40 [ 48.402072][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 48.407602][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.413822][ T0] do_idle+0x1e0/0x2c0 [ 48.417867][ T0] ? complete+0x44/0x50 [ 48.422002][ T0] cpu_startup_entry+0x1b/0x20 [ 48.426748][ T0] start_secondary+0x207/0x260 [ 48.431523][ T0] secondary_startup_64+0xa4/0xb0 [ 48.437741][ T0] Kernel Offset: disabled [ 48.442063][ T0] Rebooting in 86400 seconds..