[ 35.395304][ T25] audit: type=1800 audit(1571098707.096:21): pid=7040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 35.441996][ T25] audit: type=1800 audit(1571098707.096:22): pid=7040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 35.474186][ T25] audit: type=1800 audit(1571098707.096:23): pid=7040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 35.494579][ T25] audit: type=1800 audit(1571098707.106:24): pid=7040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.873459][ T25] audit: type=1800 audit(1571098707.576:25): pid=7040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.893211][ T25] audit: type=1800 audit(1571098707.576:26): pid=7040 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.915056][ T25] audit: type=1800 audit(1571098707.576:27): pid=7040 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 '10.128.0.5' (ECDSA) to the list of known hosts. 2019/10/15 00:18:34 fuzzer started 2019/10/15 00:18:35 dialing manager at 10.128.0.105:33683 2019/10/15 00:18:35 syscalls: 2523 2019/10/15 00:18:35 code coverage: enabled 2019/10/15 00:18:35 comparison tracing: enabled 2019/10/15 00:18:35 extra coverage: extra coverage is not supported by the kernel 2019/10/15 00:18:35 setuid sandbox: enabled 2019/10/15 00:18:35 namespace sandbox: enabled 2019/10/15 00:18:35 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 00:18:35 fault injection: enabled 2019/10/15 00:18:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 00:18:35 net packet injection: enabled 2019/10/15 00:18:35 net device setup: enabled 2019/10/15 00:18:35 concurrency sanitizer: enabled syzkaller login: [ 43.890067][ C1] ================================================================== [ 43.898203][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 43.906251][ C1] [ 43.908566][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 43.916185][ C1] tick_sched_do_timer+0xc0/0xe0 [ 43.921100][ C1] tick_sched_timer+0x43/0xe0 [ 43.925771][ C1] __hrtimer_run_queues+0x288/0x600 [ 43.930949][ C1] hrtimer_interrupt+0x22a/0x480 [ 43.935861][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 43.941294][ C1] apic_timer_interrupt+0xf/0x20 [ 43.946209][ C1] __sanitizer_cov_trace_pc+0x1a/0x50 [ 43.951561][ C1] __ip_queue_xmit+0x2d2/0xa40 [ 43.956302][ C1] ip_queue_xmit+0x45/0x60 [ 43.960695][ C1] __tcp_transmit_skb+0xdeb/0x1cd0 [ 43.965783][ C1] __tcp_send_ack+0x246/0x300 [ 43.970453][ C1] tcp_send_ack+0x34/0x40 [ 43.974756][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 43.979697][ C1] tcp_recvmsg+0x633/0x1a30 [ 43.984186][ C1] [ 43.986500][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 43.994033][ C1] tick_sched_do_timer+0x33/0xe0 [ 43.998963][ C1] tick_sched_timer+0x43/0xe0 [ 44.003623][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.008799][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.013716][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.019161][ C1] apic_timer_interrupt+0xf/0x20 [ 44.024074][ C1] __kcsan_check_watchpoint+0xbb/0x180 [ 44.029520][ C1] __tsan_write8+0x18/0x40 [ 44.033914][ C1] ipt_do_table+0x702/0xe40 [ 44.038404][ C1] iptable_mangle_hook+0x7a/0x260 [ 44.043406][ C1] nf_hook_slow+0x83/0x160 [ 44.047809][ C1] ip_rcv+0x12f/0x1a0 [ 44.051941][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.057629][ C1] [ 44.059929][ C1] Reported by Kernel Concurrency Sanitizer on: [ 44.066070][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 44.073063][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.083186][ C1] ================================================================== [ 44.091487][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 44.098052][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 44.105043][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.115070][ C1] Call Trace: [ 44.118332][ C1] [ 44.121168][ C1] dump_stack+0xf5/0x159 [ 44.125400][ C1] panic+0x209/0x639 [ 44.129294][ C1] ? ipt_do_table+0x702/0xe40 [ 44.134067][ C1] ? vprintk_func+0x8d/0x140 [ 44.138650][ C1] kcsan_report.cold+0xc/0x1b [ 44.143338][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.148886][ C1] __tsan_read4+0x2c/0x30 [ 44.153202][ C1] tick_sched_do_timer+0x33/0xe0 [ 44.158124][ C1] tick_sched_timer+0x43/0xe0 [ 44.162794][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.167970][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 44.173063][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.177985][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.183419][ C1] apic_timer_interrupt+0xf/0x20 [ 44.188329][ C1] [ 44.191247][ C1] RIP: 0010:__kcsan_check_watchpoint+0xbb/0x180 [ 44.197464][ C1] Code: 8d 44 1e ff 41 89 c3 41 c1 fb 1f 41 c1 eb 1a 44 01 d8 83 e0 3f 44 29 d8 48 98 4c 8d 1c c5 20 2c 04 86 48 8b 04 c5 20 2c 04 86 <48> 83 f8 01 76 2c 48 89 c3 49 89 c7 48 c1 eb 31 49 21 cf 81 e3 ff [ 44.217047][ C1] RSP: 0018:ffffc90000cf37c8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 44.225441][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000ffffffffffff [ 44.233390][ C1] RDX: 0000000000000003 RSI: 0000000000000032 RDI: 0000e8ffffd32008 [ 44.241340][ C1] RBP: ffffc90000cf37f0 R08: 0000000000000001 R09: 0000e8ffffd3200f [ 44.249325][ C1] R10: 00000000aaaaaaab R11: ffffffff86042da8 R12: 0000000000000001 [ 44.257303][ C1] R13: ffffe8ffffd32008 R14: 0000000000000008 R15: ffff888129310040 [ 44.265269][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 44.271144][ C1] __tsan_write8+0x18/0x40 [ 44.275553][ C1] ipt_do_table+0x702/0xe40 [ 44.280053][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.285665][ C1] iptable_mangle_hook+0x7a/0x260 [ 44.290686][ C1] nf_hook_slow+0x83/0x160 [ 44.295081][ C1] ? iptable_mangle_net_exit+0xa0/0xa0 [ 44.300517][ C1] ip_rcv+0x12f/0x1a0 [ 44.304480][ C1] ? ip_sublist_rcv+0x5e0/0x5e0 [ 44.309316][ C1] ? ip_local_deliver+0x210/0x210 [ 44.314318][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.320024][ C1] __netif_receive_skb+0x37/0xf0 [ 44.324940][ C1] netif_receive_skb_internal+0x59/0x190 [ 44.330550][ C1] napi_gro_receive+0x28f/0x330 [ 44.335381][ C1] receive_buf+0x284/0x30b0 [ 44.339960][ C1] ? __tsan_write8+0x32/0x40 [ 44.344531][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 44.349965][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.355569][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 44.361181][ C1] virtnet_poll+0x436/0x7d0 [ 44.365663][ C1] net_rx_action+0x3ae/0xa50 [ 44.370242][ C1] __do_softirq+0x115/0x33f [ 44.374725][ C1] ? takeover_tasklets+0x250/0x250 [ 44.379896][ C1] run_ksoftirqd+0x46/0x60 [ 44.384292][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 44.389215][ C1] kthread+0x1d4/0x200 [ 44.393259][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 44.399215][ C1] ? kthread_bind+0x50/0x50 [ 44.403706][ C1] ret_from_fork+0x1f/0x30 [ 44.409605][ C1] Kernel Offset: disabled [ 44.413935][ C1] Rebooting in 86400 seconds..