Hi, guys. My name is S. Han. I am a user of OVS in XenServer.
I would like to confirm that the following problem is solved in the latest OVS version (2.3.0). I tried running OVS 2.1.2 in XenServer 6.2. After the installation, the XenServer hosts frequently crash due to kernel panic. XenServer crash messages are written in ‘/var/crash/.’ According to the crash messages, in my opinion, stats_read() in the kernel module openvswitch attempted acquiring a spinlock and then the task hung. The watchdog detected it. Thus the XenServer Dom0 crashed. I presume that this problem is related to issue of the following URL. http://openvswitch.org/pipermail/dev/2014-March/038115.html I verified that the buggy code was patched in OVS 2.1.3. But, in the latest OVS (2.3.0), stats_read() has been removed. The caller ovs_flow_stats_get() has been renewed thoroughly. And I cannot explicitly find that the bug has been fixed in documents of OVS 2.3.0. So I can't verify that the problem has been solved in OVS 2.3.0. The following is system information of XenServer 6.2. # *uname -a* Linux xcnc026.nclp 2.6.32.43-0.4.1.xs1.8.0.847.170785xen #1 SMP Thu Nov 14 13:49:56 EST 2013 i686 i686 i386 GNU/Linux The following is a part of the kernel panic message. I attached the kernel panic message file. ============================================== <4>[2654864.272868] Call Trace: <4>[2654864.272873] [<c02ddef1>] ? xen_poll_irq+0x91/0xe0 <4>[2654864.272877] [<c02e40aa>] xen_spin_wait+0x12a/0x2a0 <4>[2654864.272881] [<c03d8678>] _spin_lock+0xe8/0x100 <4>[2654864.272885] [<c0396138>] tcp_v4_rcv+0x598/0x890 <4>[2654864.272889] [<ee3f6270>] ? ipv4_confirm+0x0/0x160 [nf_conntrack_ipv4] <4>[2654864.272892] [<c0378fd2>] ip_local_deliver_finish+0xe2/0x250 <4>[2654864.272895] [<c0378ef0>] ? ip_local_deliver_finish+0x0/0x250 <4>[2654864.272898] [<c0379582>] ip_local_deliver+0x32/0xa0 <4>[2654864.272900] [<c0378ef0>] ? ip_local_deliver_finish+0x0/0x250 <4>[2654864.272903] [<c0378ccf>] ip_rcv_finish+0x14f/0x370 <4>[2654864.272905] [<c0378b80>] ? ip_rcv_finish+0x0/0x370 <4>[2654864.272908] [<c0379462>] ip_rcv+0x202/0x2f0 <4>[2654864.272910] [<c0378b80>] ? ip_rcv_finish+0x0/0x370 <4>[2654864.272913] [<c0379260>] ? ip_rcv+0x0/0x2f0 <4>[2654864.272916] [<c03528f7>] netif_receive_skb+0x437/0x6a0 <4>[2654864.272919] [<c0356197>] process_backlog+0x97/0xf0 <4>[2654864.272922] [<c0355ec5>] net_rx_action+0x155/0x260 <4>[2654864.272926] [<c013a8c2>] __do_softirq+0xc2/0x200 <4>[2654864.272929] [<c02dfbc5>] ? end_pirq+0x95/0x110 <4>[2654864.272932] [<c013aa75>] do_softirq+0x75/0x80 <4>[2654864.272933] [<c013b135>] irq_exit+0x35/0x40 <4>[2654864.272936] [<c03dc75c>] evtchn_do_upcall+0x2fc/0x4a9 <4>[2654864.272939] [<c010477f>] hypervisor_callback+0x43/0x4b <4>[2654864.272942] [<c026007b>] ? radix_tree_delete+0xab/0x230 <4>[2654864.272945] [<c02dde3d>] ? force_evtchn_callback+0xd/0x10 <4>[2654864.272947] [<c03d860a>] _spin_lock+0x7a/0x100 <4>[2654864.272952] [<ee42fbfa>] stats_read+0x9a/0xc0 [openvswitch] <4>[2654864.272956] [<ee430750>] ovs_flow_stats_get+0x70/0xc0 [openvswitch] <4>[2654864.272960] [<ee42d371>] ovs_flow_cmd_fill_info+0x201/0x300 [openvswitch] <4>[2654864.272964] [<ee42d4c1>] ovs_flow_cmd_build_info+0x51/0x80 [openvswitch] <4>[2654864.272968] [<ee42f69c>] ovs_flow_cmd_get+0xcc/0x130 [openvswitch] <4>[2654864.272971] [<c0371b63>] genl_rcv_msg+0x183/0x1c0 <4>[2654864.272973] [<c03719e0>] ? genl_rcv_msg+0x0/0x1c0 <4>[2654864.272975] [<c036ec8d>] netlink_rcv_skb+0x7d/0xa0 <4>[2654864.272978] [<c0370821>] genl_rcv+0x21/0x30 <4>[2654864.272979] [<c036ea21>] netlink_unicast+0x241/0x250 <4>[2654864.272982] [<c034c99c>] ? memcpy_fromiovec+0x4c/0x70 <4>[2654864.272984] [<c036f711>] netlink_sendmsg+0x1c1/0x280 <4>[2654864.272987] [<c0342ea7>] sock_sendmsg+0xd7/0x100 <4>[2654864.272990] [<c014e8c0>] ? autoremove_wake_function+0x0/0x50 <4>[2654864.272993] [<c0379582>] ? ip_local_deliver+0x32/0xa0 <4>[2654864.272995] [<c014e8c0>] ? autoremove_wake_function+0x0/0x50 <4>[2654864.272997] [<c0378b80>] ? ip_rcv_finish+0x0/0x370 <4>[2654864.273000] [<c02644b1>] ? copy_from_user+0x41/0x70 <4>[2654864.273002] [<c034ccc6>] ? verify_iovec+0x36/0xa0 <4>[2654864.273005] [<c0342fe6>] sys_sendmsg+0x116/0x230 <4>[2654864.273007] [<c0343b9a>] ? sys_recvmsg+0x1ba/0x1c0 <4>[2654864.273009] [<c03561b8>] ? process_backlog+0xb8/0xf0 <4>[2654864.273012] [<c0106730>] ? xen_clocksource_read+0x20/0x130 <4>[2654864.273015] [<c013aa75>] ? do_softirq+0x75/0x80 <4>[2654864.273018] [<c0344277>] sys_socketcall+0x247/0x270 <4>[2654864.273021] [<c0264683>] ? copy_to_user+0x43/0x60 <4>[2654864.273023] [<c014d380>] ? posix_ktime_get_ts+0x0/0x20 <4>[2654864.273025] [<c0104571>] syscall_call+0x7/0xb <0>[2654864.273027] Kernel panic - not syncing: softlockup: hung tasks <4>[2654864.273032] Pid: 6586, comm: ovs-vswitchd Not tainted 2.6.32.43-0.4.1.xs1.8.0.847.170785xen #1 Thank you S. Han
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