[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.712042][ T25] audit: type=1800 audit(1570560030.249:25): pid=6965 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.742557][ T25] audit: type=1800 audit(1570560030.249:26): pid=6965 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.771987][ T25] audit: type=1800 audit(1570560030.249:27): pid=6965 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 '10.128.0.157' (ECDSA) to the list of known hosts. 2019/10/08 18:40:38 fuzzer started 2019/10/08 18:40:39 dialing manager at 10.128.0.105:35069 2019/10/08 18:40:39 syscalls: 2523 2019/10/08 18:40:39 code coverage: enabled 2019/10/08 18:40:39 comparison tracing: enabled 2019/10/08 18:40:39 extra coverage: extra coverage is not supported by the kernel 2019/10/08 18:40:39 setuid sandbox: enabled 2019/10/08 18:40:39 namespace sandbox: enabled 2019/10/08 18:40:39 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/08 18:40:39 fault injection: enabled 2019/10/08 18:40:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/08 18:40:39 net packet injection: enabled 2019/10/08 18:40:39 net device setup: enabled 2019/10/08 18:40:39 concurrency sanitizer: enabled syzkaller login: [ 46.072810][ T0] ================================================================== [ 46.081042][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 46.089518][ T0] [ 46.091831][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 46.099539][ T0] tick_sched_do_timer+0xc0/0xe0 [ 46.104529][ T0] tick_sched_timer+0x43/0xe0 [ 46.109249][ T0] __hrtimer_run_queues+0x288/0x600 [ 46.114430][ T0] hrtimer_interrupt+0x22a/0x480 [ 46.119347][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.124790][ T0] apic_timer_interrupt+0xf/0x20 [ 46.129731][ T0] __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 46.135687][ T0] skb_release_all+0x1f/0x60 [ 46.140253][ T0] napi_consume_skb+0xff/0x2d0 [ 46.145006][ T0] free_old_xmit_skbs+0x7c/0x170 [ 46.149932][ T0] virtnet_poll_tx+0x12a/0x1d0 [ 46.154671][ T0] net_rx_action+0x3ae/0xa50 [ 46.159234][ T0] __do_softirq+0x115/0x33f [ 46.163716][ T0] irq_exit+0xbb/0xe0 [ 46.168017][ T0] [ 46.170338][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 46.177601][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 46.183128][ T0] do_idle+0x1e0/0x2c0 [ 46.187173][ T0] cpu_startup_entry+0x1b/0x20 [ 46.191918][ T0] start_secondary+0x207/0x260 [ 46.196661][ T0] secondary_startup_64+0xa4/0xb0 [ 46.201741][ T0] [ 46.204042][ T0] Reported by Kernel Concurrency Sanitizer on: [ 46.210185][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 46.217529][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.227650][ T0] ================================================================== [ 46.235871][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 46.242449][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0+ #0 [ 46.249185][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.259313][ T0] Call Trace: [ 46.262594][ T0] dump_stack+0xf5/0x159 [ 46.266818][ T0] panic+0x209/0x639 [ 46.270702][ T0] ? vprintk_func+0x8d/0x140 [ 46.275271][ T0] kcsan_report.cold+0xc/0x1b [ 46.279927][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.285479][ T0] __tsan_read4+0x2c/0x30 [ 46.289801][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 46.295352][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 46.301580][ T0] do_idle+0x1e0/0x2c0 [ 46.305644][ T0] ? complete+0x44/0x50 [ 46.309803][ T0] cpu_startup_entry+0x1b/0x20 [ 46.314545][ T0] start_secondary+0x207/0x260 [ 46.319291][ T0] secondary_startup_64+0xa4/0xb0 [ 46.325701][ T0] Kernel Offset: disabled [ 46.330031][ T0] Rebooting in 86400 seconds..