[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.157566][ T23] audit: type=1800 audit(1571750619.814:25): pid=7061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.184702][ T23] audit: type=1800 audit(1571750619.814:26): pid=7061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.211602][ T23] audit: type=1800 audit(1571750619.814:27): pid=7061 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 '10.128.0.133' (ECDSA) to the list of known hosts. 2019/10/22 13:23:51 fuzzer started 2019/10/22 13:23:52 dialing manager at 10.128.0.105:37053 2019/10/22 13:23:52 syscalls: 2524 2019/10/22 13:23:52 code coverage: enabled 2019/10/22 13:23:52 comparison tracing: enabled 2019/10/22 13:23:52 extra coverage: extra coverage is not supported by the kernel 2019/10/22 13:23:52 setuid sandbox: enabled 2019/10/22 13:23:52 namespace sandbox: enabled 2019/10/22 13:23:52 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 13:23:52 fault injection: enabled 2019/10/22 13:23:52 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 13:23:52 net packet injection: enabled 2019/10/22 13:23:52 net device setup: enabled 2019/10/22 13:23:52 concurrency sanitizer: enabled syzkaller login: [ 50.274246][ C0] ================================================================== [ 50.282470][ C0] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 50.290949][ C0] [ 50.293263][ C0] write to 0xffff8881248fda08 of 4 bytes by task 7220 on cpu 1: [ 50.300870][ C0] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.307473][ C0] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.312998][ C0] nf_conntrack_in+0x410/0xa80 [ 50.317754][ C0] ipv4_conntrack_local+0xbe/0x130 [ 50.322858][ C0] nf_hook_slow+0x83/0x160 [ 50.327265][ C0] __ip_local_out+0x1f7/0x2b0 [ 50.331920][ C0] ip_local_out+0x31/0x90 [ 50.336229][ C0] __ip_queue_xmit+0x3a8/0xa40 [ 50.340985][ C0] ip_queue_xmit+0x45/0x60 [ 50.345379][ C0] __tcp_transmit_skb+0xe81/0x1d60 [ 50.350467][ C0] __tcp_send_ack+0x246/0x300 [ 50.355136][ C0] tcp_send_ack+0x34/0x40 [ 50.359445][ C0] tcp_cleanup_rbuf+0x130/0x360 [ 50.364272][ C0] tcp_recvmsg+0x633/0x1a30 [ 50.368761][ C0] [ 50.371071][ C0] read to 0xffff8881248fda08 of 4 bytes by interrupt on cpu 0: [ 50.378591][ C0] __nf_conntrack_find_get+0x284/0x880 [ 50.384024][ C0] nf_conntrack_in+0x2ef/0xa80 [ 50.388761][ C0] ipv4_conntrack_in+0x27/0x40 [ 50.393502][ C0] nf_hook_slow+0x83/0x160 [ 50.397892][ C0] ip_rcv+0x12f/0x1a0 [ 50.401850][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.407545][ C0] __netif_receive_skb+0x37/0xf0 [ 50.412476][ C0] netif_receive_skb_internal+0x59/0x190 [ 50.418085][ C0] napi_gro_receive+0x28f/0x330 [ 50.422914][ C0] receive_buf+0x284/0x30b0 [ 50.427420][ C0] virtnet_poll+0x436/0x7d0 [ 50.431912][ C0] net_rx_action+0x3ae/0xa90 [ 50.436484][ C0] __do_softirq+0x115/0x33f [ 50.440973][ C0] [ 50.443288][ C0] Reported by Kernel Concurrency Sanitizer on: [ 50.449431][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 50.456522][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.466644][ C0] ================================================================== [ 50.474680][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 50.481244][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 50.488321][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.498350][ C0] Call Trace: [ 50.501606][ C0] [ 50.504445][ C0] dump_stack+0xf5/0x159 [ 50.508662][ C0] panic+0x210/0x640 [ 50.512552][ C0] ? napi_gro_receive+0x28f/0x330 [ 50.517569][ C0] ? vprintk_func+0x8d/0x140 [ 50.522141][ C0] kcsan_report.cold+0xc/0x10 [ 50.526887][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.532423][ C0] __tsan_read4+0x2c/0x30 [ 50.536751][ C0] __nf_conntrack_find_get+0x284/0x880 [ 50.542224][ C0] ? __tsan_write2+0x32/0x40 [ 50.546806][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.552433][ C0] nf_conntrack_in+0x2ef/0xa80 [ 50.557182][ C0] ipv4_conntrack_in+0x27/0x40 [ 50.561929][ C0] nf_hook_slow+0x83/0x160 [ 50.566323][ C0] ? nf_ct_bridge_unregister+0x70/0x70 [ 50.571759][ C0] ip_rcv+0x12f/0x1a0 [ 50.575715][ C0] ? ip_sublist_rcv+0x5e0/0x5e0 [ 50.580544][ C0] ? ip_local_deliver+0x210/0x210 [ 50.585547][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.591247][ C0] __netif_receive_skb+0x37/0xf0 [ 50.596183][ C0] netif_receive_skb_internal+0x59/0x190 [ 50.601810][ C0] napi_gro_receive+0x28f/0x330 [ 50.606659][ C0] receive_buf+0x284/0x30b0 [ 50.611139][ C0] ? __tsan_write8+0x32/0x40 [ 50.615726][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 50.621160][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.626780][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.632392][ C0] virtnet_poll+0x436/0x7d0 [ 50.636881][ C0] net_rx_action+0x3ae/0xa90 [ 50.641455][ C0] __do_softirq+0x115/0x33f [ 50.645938][ C0] irq_exit+0xbb/0xe0 [ 50.649897][ C0] do_IRQ+0xa6/0x180 [ 50.653768][ C0] common_interrupt+0xf/0xf [ 50.658243][ C0] [ 50.661178][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 50.666541][ C0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d fc b2 4b 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec b2 4b 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 72 12 a4 fc e8 6d 8e b8 fd 0f [ 50.686123][ C0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda [ 50.694522][ C0] RAX: a9fbe76c8b439bae RBX: ffffffff85a2b780 RCX: 000000000000053f [ 50.702468][ C0] RDX: 0000000000055730 RSI: 020c49ba5e353f7d RDI: ffffffff85a563b8 [ 50.710448][ C0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a563bf [ 50.718404][ C0] R10: 00000000aaaaaaab R11: ffffffff86045cc8 R12: 0000000000000000 [ 50.726353][ C0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000 [ 50.734326][ C0] ? default_idle+0x50/0x230 [ 50.738898][ C0] arch_cpu_idle+0x1f/0x30 [ 50.743309][ C0] default_idle_call+0x1e/0x40 [ 50.748052][ C0] do_idle+0x1af/0x280 [ 50.752114][ C0] cpu_startup_entry+0x1b/0x20 [ 50.756864][ C0] rest_init+0xec/0xf6 [ 50.760916][ C0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 50.768103][ C0] arch_call_rest_init+0x17/0x37 [ 50.773017][ C0] start_kernel+0x838/0x85e [ 50.777505][ C0] x86_64_start_reservations+0x29/0x2b [ 50.782955][ C0] x86_64_start_kernel+0x72/0x76 [ 50.787888][ C0] secondary_startup_64+0xa4/0xb0 [ 50.794228][ C0] Kernel Offset: disabled [ 50.798562][ C0] Rebooting in 86400 seconds..