[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.530653][ T25] audit: type=1800 audit(1570888282.385:25): pid=6992 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.557885][ T25] audit: type=1800 audit(1570888282.385:26): pid=6992 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.598185][ T25] audit: type=1800 audit(1570888282.385:27): pid=6992 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 '10.128.15.208' (ECDSA) to the list of known hosts. 2019/10/12 13:51:30 fuzzer started 2019/10/12 13:51:32 dialing manager at 10.128.0.105:43913 2019/10/12 13:51:32 syscalls: 2523 2019/10/12 13:51:32 code coverage: enabled 2019/10/12 13:51:32 comparison tracing: enabled 2019/10/12 13:51:32 extra coverage: extra coverage is not supported by the kernel 2019/10/12 13:51:32 setuid sandbox: enabled 2019/10/12 13:51:32 namespace sandbox: enabled 2019/10/12 13:51:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 13:51:32 fault injection: enabled 2019/10/12 13:51:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 13:51:32 net packet injection: enabled 2019/10/12 13:51:32 net device setup: enabled 2019/10/12 13:51:32 concurrency sanitizer: enabled syzkaller login: [ 44.788832][ C1] ================================================================== [ 44.797218][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 44.806278][ C1] [ 44.808597][ C1] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 44.816411][ C1] tick_do_update_jiffies64+0x105/0x260 [ 44.821947][ C1] tick_sched_do_timer+0xd4/0xe0 [ 44.826873][ C1] tick_sched_timer+0x43/0xe0 [ 44.831593][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.836779][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.841709][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.849440][ C1] apic_timer_interrupt+0xf/0x20 [ 44.854354][ C1] [ 44.856668][ C1] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 44.864420][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 44.870082][ C1] tick_sched_do_timer+0xd4/0xe0 [ 44.875062][ C1] tick_sched_timer+0x43/0xe0 [ 44.879729][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.885057][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.890002][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.895481][ C1] apic_timer_interrupt+0xf/0x20 [ 44.900638][ C1] __kcsan_setup_watchpoint+0x8e/0x510 [ 44.906092][ C1] __tsan_read8+0x2c/0x30 [ 44.910532][ C1] iptable_raw_hook+0x27/0x60 [ 44.915451][ C1] nf_hook_slow+0x83/0x160 [ 44.920034][ C1] ip_rcv+0x12f/0x1a0 [ 44.924126][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.929941][ C1] [ 44.932428][ C1] Reported by Kernel Concurrency Sanitizer on: [ 44.938620][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 44.945837][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.955988][ C1] ================================================================== [ 44.964358][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 44.970934][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 44.978175][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.988447][ C1] Call Trace: [ 44.991745][ C1] [ 44.994643][ C1] dump_stack+0xf5/0x159 [ 44.998879][ C1] panic+0x209/0x639 [ 45.002763][ C1] ? __tsan_read8+0x2c/0x30 [ 45.007293][ C1] ? vprintk_func+0x8d/0x140 [ 45.011871][ C1] kcsan_report.cold+0xc/0x1b [ 45.016555][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.022160][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.027906][ C1] __tsan_read8+0x2c/0x30 [ 45.032260][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 45.037707][ C1] tick_sched_do_timer+0xd4/0xe0 [ 45.042723][ C1] tick_sched_timer+0x43/0xe0 [ 45.047425][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.052722][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 45.057907][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.063008][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.068461][ C1] apic_timer_interrupt+0xf/0x20 [ 45.073472][ C1] [ 45.076404][ C1] RIP: 0010:__kcsan_setup_watchpoint+0x8e/0x510 [ 45.083158][ C1] Code: 5e 41 5f 5d c3 65 8b 05 64 95 af 7e 85 c0 0f 8f be 01 00 00 65 8b 05 59 95 af 7e 85 c0 7f d4 65 8a 05 52 95 af 7e 84 c0 75 c9 <4c> 89 ef e8 6a 06 00 00 84 c0 75 bd b9 01 00 00 00 65 48 0f c1 0d [ 45.102838][ C1] RSP: 0018:ffffc90000cf3960 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 45.111240][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000ffffffffffff [ 45.119326][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffc90000cf3a50 [ 45.127371][ C1] RBP: ffffc90000cf39a0 R08: 0000000000000000 R09: 0000c90000cf3a57 [ 45.135334][ C1] R10: 00000000aaaaaaab R11: ffffffff86042db0 R12: 0000000000000008 [ 45.143292][ C1] R13: ffffc90000cf3a50 R14: ffff888124a84400 R15: ffffc90000cf3a30 [ 45.151611][ C1] __tsan_read8+0x2c/0x30 [ 45.155940][ C1] iptable_raw_hook+0x27/0x60 [ 45.160725][ C1] nf_hook_slow+0x83/0x160 [ 45.165248][ C1] ? iptable_raw_net_exit+0xa0/0xa0 [ 45.170579][ C1] ip_rcv+0x12f/0x1a0 [ 45.174574][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 45.179723][ C1] ? ip_local_deliver+0x210/0x210 [ 45.184743][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.190487][ C1] __netif_receive_skb+0x37/0xf0 [ 45.195505][ C1] netif_receive_skb_internal+0x59/0x190 [ 45.201127][ C1] napi_gro_receive+0x28f/0x330 [ 45.206088][ C1] receive_buf+0x284/0x30b0 [ 45.210644][ C1] ? __tsan_write8+0x32/0x40 [ 45.215227][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 45.220671][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.226399][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.232140][ C1] virtnet_poll+0x436/0x7d0 [ 45.236636][ C1] net_rx_action+0x3ae/0xa50 [ 45.241257][ C1] __do_softirq+0x115/0x33f [ 45.245750][ C1] ? takeover_tasklets+0x250/0x250 [ 45.250867][ C1] run_ksoftirqd+0x46/0x60 [ 45.255271][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 45.260196][ C1] kthread+0x1d4/0x200 [ 45.264774][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 45.270882][ C1] ? kthread_bind+0x50/0x50 [ 45.275438][ C1] ret_from_fork+0x1f/0x30 [ 45.281606][ C1] Kernel Offset: disabled [ 45.286396][ C1] Rebooting in 86400 seconds..