[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.824720][ T23] audit: type=1800 audit(1570745377.957:25): pid=7082 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.844307][ T23] audit: type=1800 audit(1570745377.957:26): pid=7082 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.844321][ T23] audit: type=1800 audit(1570745377.957:27): pid=7082 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 '10.128.0.246' (ECDSA) to the list of known hosts. 2019/10/10 22:09:47 fuzzer started 2019/10/10 22:09:49 dialing manager at 10.128.0.105:37331 2019/10/10 22:09:49 syscalls: 2523 2019/10/10 22:09:49 code coverage: enabled 2019/10/10 22:09:49 comparison tracing: enabled 2019/10/10 22:09:49 extra coverage: extra coverage is not supported by the kernel 2019/10/10 22:09:49 setuid sandbox: enabled 2019/10/10 22:09:49 namespace sandbox: enabled 2019/10/10 22:09:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 22:09:49 fault injection: enabled 2019/10/10 22:09:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 22:09:49 net packet injection: enabled 2019/10/10 22:09:49 net device setup: enabled 2019/10/10 22:09:49 concurrency sanitizer: enabled syzkaller login: [ 46.143800][ C0] ================================================================== [ 46.152345][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 46.161361][ C0] [ 46.163684][ C0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 46.171394][ C0] tick_do_update_jiffies64+0x105/0x260 [ 46.177226][ C0] tick_sched_do_timer+0xd4/0xe0 [ 46.182154][ C0] tick_sched_timer+0x43/0xe0 [ 46.186824][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.192023][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.197022][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.202483][ C0] apic_timer_interrupt+0xf/0x20 [ 46.207485][ C0] [ 46.209796][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 46.217321][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 46.222930][ C0] tick_sched_do_timer+0xd4/0xe0 [ 46.227878][ C0] tick_sched_timer+0x43/0xe0 [ 46.233430][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.238625][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.243663][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.249103][ C0] apic_timer_interrupt+0xf/0x20 [ 46.254041][ C0] __kcsan_setup_watchpoint+0x61/0x510 [ 46.259475][ C0] __tsan_read4+0x2c/0x30 [ 46.263785][ C0] ipt_do_table+0x6f0/0xe40 [ 46.268277][ C0] iptable_security_hook+0x4a/0x60 [ 46.273370][ C0] nf_hook_slow+0x83/0x160 [ 46.277767][ C0] ip_local_deliver+0x1e5/0x210 [ 46.282600][ C0] [ 46.284912][ C0] Reported by Kernel Concurrency Sanitizer on: [ 46.291150][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 46.298231][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.308358][ C0] ================================================================== [ 46.316501][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 46.323259][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 46.330276][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.340323][ C0] Call Trace: [ 46.343676][ C0] [ 46.346526][ C0] dump_stack+0xf5/0x159 [ 46.350753][ C0] panic+0x209/0x639 [ 46.354637][ C0] ? __tsan_read4+0x2c/0x30 [ 46.359140][ C0] ? vprintk_func+0x8d/0x140 [ 46.363798][ C0] kcsan_report.cold+0xc/0x1b [ 46.368900][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.374441][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.380055][ C0] __tsan_read8+0x2c/0x30 [ 46.384381][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 46.390117][ C0] tick_sched_do_timer+0xd4/0xe0 [ 46.395990][ C0] tick_sched_timer+0x43/0xe0 [ 46.400743][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.405938][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.411041][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.415973][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.421425][ C0] apic_timer_interrupt+0xf/0x20 [ 46.427835][ C0] [ 46.430779][ C0] RIP: 0010:__kcsan_setup_watchpoint+0x61/0x510 [ 46.437783][ C0] Code: 88 e4 09 00 00 85 c9 0f 8f e6 01 00 00 8b 90 e8 09 00 00 85 d2 7f 09 80 b8 ec 09 00 00 00 74 37 0f 1f 00 48 83 c4 18 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 65 8b 05 64 95 af 7e 85 c0 0f 8f be 01 00 [ 46.467443][ C0] RSP: 0018:ffffc90000cb3760 EFLAGS: 00000296 ORIG_RAX: ffffffffffffff13 [ 46.476893][ C0] RAX: f5c28f5c28f5e71f RBX: ffffe8ffffc39000 RCX: 000000000000078a [ 46.484867][ C0] RDX: 00000000001fb530 RSI: 020c49ba5e353f7d RDI: ffff888125115a70 [ 46.492857][ C0] RBP: ffffc90000cb3778 R08: 0000000000000000 R09: 0000888125115a73 [ 46.500807][ C0] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffff888125115a70 [ 46.508868][ C0] R13: ffff888125115a70 R14: ffffe8ffffc39008 R15: ffff8881293f2040 [ 46.516849][ C0] __tsan_read4+0x2c/0x30 [ 46.521278][ C0] ipt_do_table+0x6f0/0xe40 [ 46.525905][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.531520][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.537136][ C0] iptable_security_hook+0x4a/0x60 [ 46.542412][ C0] nf_hook_slow+0x83/0x160 [ 46.546823][ C0] ? iptable_security_net_exit+0xa0/0xa0 [ 46.552523][ C0] ip_local_deliver+0x1e5/0x210 [ 46.557355][ C0] ? ip_protocol_deliver_rcu+0x470/0x470 [ 46.562980][ C0] ip_rcv_finish+0x121/0x160 [ 46.567552][ C0] ip_rcv+0x18f/0x1a0 [ 46.571512][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 46.576464][ C0] ? ip_local_deliver+0x210/0x210 [ 46.581472][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.587171][ C0] __netif_receive_skb+0x37/0xf0 [ 46.592099][ C0] netif_receive_skb_internal+0x59/0x190 [ 46.597719][ C0] napi_gro_receive+0x28f/0x330 [ 46.602557][ C0] receive_buf+0x284/0x30b0 [ 46.607035][ C0] ? __tsan_write8+0x32/0x40 [ 46.611616][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 46.617051][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.622662][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.628273][ C0] virtnet_poll+0x436/0x7d0 [ 46.632756][ C0] ? __queue_work+0x910/0x910 [ 46.637414][ C0] net_rx_action+0x3ae/0xa50 [ 46.641987][ C0] __do_softirq+0x115/0x33f [ 46.646470][ C0] ? takeover_tasklets+0x250/0x250 [ 46.651558][ C0] run_ksoftirqd+0x46/0x60 [ 46.655981][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 46.660894][ C0] kthread+0x1d4/0x200 [ 46.664949][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 46.670900][ C0] ? kthread_bind+0x50/0x50 [ 46.675379][ C0] ret_from_fork+0x1f/0x30 [ 46.681148][ C0] Kernel Offset: disabled [ 46.685470][ C0] Rebooting in 86400 seconds..