[Intel-wired-lan] Soft lockup issue in igb driver

Sumit Gemini1 sumit.gemini1 at globallogic.com
Fri Nov 4 08:40:51 UTC 2016


this igb-3.2.10 driver and kernel is 3.1.10. operating system is Suse 12.3

I have one issue, at customer machine the user space process is hogging up
the processor (soft lockup)along with 2 kernel process and dump stack trace
showing RIP at _ticket_spin_lock in all 3 process.

As i know "If an user-space process had caused the soft-lockup, a line
identifying the process by its pid would logged, followed by the contents
of various CPU-registers without a call-trace of any sorts" but in my case
i am getting dump stack trace for user process too.

is it coming from a misbehaving user space app? is it normal functionality
of soft lockup? if is it functionality of soft lockup then how to resolve
the issue?

Any help will be highly appreciated.

it is x86_64 machine and kernel is 3.1.10. I know all 3 process are waiting
for _ticket_spin_lock. see :

Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492033] BUG: soft lockup -
CPU#3 stuck for 22s! [virtio_shm/5/3:7874]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404215] BUG: soft lockup -
CPU#31 stuck for 23s! [kni_thread:6605]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172014] BUG: soft lockup -
CPU#0 stuck for 22s! [gis:14145]


here gis is my user space process but has call trace.

Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492033] BUG: soft lockup -
CPU#3 stuck for 22s! [virtio_shm/5/3:7874]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492036] Modules linked in:
xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip
xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6
xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG xt_limit xt_hashcounter
ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64
twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160
crypto_null af_key iptable_mangle ip_set arptable_filter arp_tables
iptable_raw iptable_nat nfnetlink_log nfnetlink ipt_ULOG ipt_PORTMAP
af_packet zlib zlib_deflate sha512_generic sha256_generic sha1_generic md5
icp_qa_al pcie8120 rte_kni pfe_pep virtio_rte virtio_shm virtio_vtnet
virtio_uio igb_uio virtio_ring virtio uio xt_tcpudp xt_state xt_pkttype
nf_conntrack_control bonding binfmt_misc iptable_filter ip6table_filter
ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4
nf_defrag_ipv4 ip_tables x_tables mperf ipmi_devintf ipmi_si
ipmi_msghandler edd nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp
stp llc gb_sys usb_storage uas iTCO_wdt ioatdma pcspkr iTCO_vendor_support
ixgbe igb wmi i2c_i801 mdio dca sg button container ipv6 autofs4 usbhid
ehci_hcd megasr(P) usbcore processor thermal_sys
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492126] CPU 3
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492127] Modules linked in:
xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip
xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6
xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG xt_limit xt_hashcounter
ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64
twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160
crypto_null af_key iptable_mangle ip_set arptable_filter arp_tables
iptable_raw iptable_nat nfnetlink_log nfnetlink ipt_ULOG ipt_PORTMAP
af_packet zlib zlib_deflate sha512_generic sha256_generic sha1_generic md5
icp_qa_al pcie8120 rte_kni pfe_pep virtio_rte virtio_shm virtio_vtnet
virtio_uio igb_uio virtio_ring virtio uio xt_tcpudp xt_state xt_pkttype
nf_conntrack_control bonding binfmt_misc iptable_filter ip6table_filter
ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4
nf_defrag_ipv4 ip_tables x_tables mperf ipmi_devintf ipmi_si
ipmi_msghandler edd nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp
stp llc gb_sys usb_storage uas iTCO_wdt ioatdma pcspkr iTCO_vendor_support
ixgbe igb wmi i2c_i801 mdio dca sg button container ipv6 autofs4 usbhid
ehci_hcd megasr(P) usbcore processor thermal_sys
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492193]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492196] Pid: 7874, comm:
virtio_shm/5/3 Tainted: P            3.1.10-gb20-default #1 Intel
Corporation S2600CO/S2600CO
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492201] RIP:
0010:[<ffffffff81020650>]  [<ffffffff81020650>] __ticket_spin_lock+0x18/0x1b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492208] RSP:
0018:ffff88043ee63de8  EFLAGS: 00000293
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492210] RAX:
00000000000069be RBX: ffff880423772740 RCX: 000000000000000e
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492213] RDX:
00000000000069bc RSI: 000000000000000e RDI: ffff88041e56a484
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492215] RBP:
ffff88041e56a484 R08: ffff88041e56a740 R09: ffff88041554f04c
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492217] R10:
0000000000000048 R11: ffff88041ee7fbc0 R12: ffff88043ee63d58
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492219] R13:
ffffffff813f831e R14: ffff88041e56a484 R15: ffff88041ee7fbc0
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492222] FS:
 0000000000000000(0000) GS:ffff88043ee60000(0000) knlGS:0000000000000000
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492225] CS:  0010 DS: 0000
ES: 0000 CR0: 000000008005003b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492227] CR2:
000000000078a410 CR3: 000000080b8df000 CR4: 00000000000406e0
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492229] DR0:
0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492232] DR3:
0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492234] Process
virtio_shm/5/3 (pid: 7874, threadinfo ffff880811e52000, task
ffff880821e320c0)
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492236] Stack:
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492238]  ffffffff8106b766
ffffffffa05e3a1e 000000001201fea9 ffffffffa03ef8b8
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492244]  0000002e1201fea9
ffff880423772000 ffff88043ee63e48 ffff880423772000
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492249]  ffffffff8192a870
0000000000000608 0000000000000000 ffffffff81928b00
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492255] Call Trace:
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492266]
 [<ffffffff8106b766>] do_raw_spin_lock+0x5/0x8
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492275]
 [<ffffffffa05e3a1e>] packet_rcv+0x254/0x2ab [af_packet]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492299]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492304]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492311]
 [<ffffffffa03e2b49>] virtio_rte_recv_packets+0x2c/0x49 [virtio_rte]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492318]
 [<ffffffffa03e2b78>] virtio_rte_poll+0x12/0x8c [virtio_rte]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492325]
 [<ffffffff81339c88>] net_rx_action+0x65/0x178
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492331]
 [<ffffffff81045c73>] __do_softirq+0xb2/0x19d
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492337]
 [<ffffffff813f9aac>] call_softirq+0x1c/0x30
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492343]
 [<ffffffff81003931>] do_softirq+0x3c/0x7b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492348]
 [<ffffffff81045971>] _local_bh_enable_ip.isra.12+0x75/0x9b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492355]
 [<ffffffffa03d8cdc>] virtio_shm_interrupt.isra.8+0xd6/0xeb [virtio_shm]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492363]
 [<ffffffffa03d8e0c>] virtio_shm_intr_task+0x11b/0x15f [virtio_shm]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492371]
 [<ffffffff8105975a>] kthread+0x76/0x7e
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492377]
 [<ffffffff813f99b4>] kernel_thread_helper+0x4/0x10
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492379] Code: b7 c9 40 0f
b6 ff 48 89 c2 44 89 ce e9 8e fb ff ff 90 90 b8 00 00 01 00 f0 0f c1 07 0f
b7 d0 c1 e8 10 39 c2 74 07 f3 90 0f b7 17 <eb> f5 c3 8b 07 89 c2 c1 c0 10
39 c2 8d 90 00 00 01 00 75 04 f0
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492409] Call Trace:
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492413]
 [<ffffffff8106b766>] do_raw_spin_lock+0x5/0x8
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492418]
 [<ffffffffa05e3a1e>] packet_rcv+0x254/0x2ab [af_packet]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492428]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492432]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492437]
 [<ffffffffa03e2b49>] virtio_rte_recv_packets+0x2c/0x49 [virtio_rte]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492444]
 [<ffffffffa03e2b78>] virtio_rte_poll+0x12/0x8c [virtio_rte]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492450]
 [<ffffffff81339c88>] net_rx_action+0x65/0x178
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492454]
 [<ffffffff81045c73>] __do_softirq+0xb2/0x19d
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492459]
 [<ffffffff813f9aac>] call_softirq+0x1c/0x30
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492463]
 [<ffffffff81003931>] do_softirq+0x3c/0x7b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492467]
 [<ffffffff81045971>] _local_bh_enable_ip.isra.12+0x75/0x9b
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492472]
 [<ffffffffa03d8cdc>] virtio_shm_interrupt.isra.8+0xd6/0xeb [virtio_shm]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492480]
 [<ffffffffa03d8e0c>] virtio_shm_intr_task+0x11b/0x15f [virtio_shm]
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492486]
 [<ffffffff8105975a>] kthread+0x76/0x7e
Aug 26 09:31:58 at-vie01a-cq21b kernel: [115452.492491]
 [<ffffffff813f99b4>] kernel_thread_helper+0x4/0x10
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404215] BUG: soft lockup -
CPU#31 stuck for 23s! [kni_thread:6605]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404219] Modules linked in:
xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip
xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6
xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG xt_limit xt_hashcounter
ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64
twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160
crypto_null af_key iptable_mangle ip_set arptable_filter arp_tables
iptable_raw iptable_nat nfnetlink_log nfnetlink ipt_ULOG ipt_PORTMAP
af_packet zlib zlib_deflate sha512_generic sha256_generic sha1_generic md5
icp_qa_al pcie8120 rte_kni pfe_pep virtio_rte virtio_shm virtio_vtnet
virtio_uio igb_uio virtio_ring virtio uio xt_tcpudp xt_state xt_pkttype
nf_conntrack_control bonding binfmt_misc iptable_filter ip6table_filter
ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4
nf_defrag_ipv4 ip_tables x_tables mperf ipmi_devintf ipmi_si
ipmi_msghandler edd nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp
stp llc gb_sys usb_storage uas iTCO_wdt ioatdma pcspkr iTCO_vendor_support
ixgbe igb wmi i2c_i801 mdio dca sg button container ipv6 autofs4 usbhid
ehci_hcd megasr(P) usbcore processor thermal_sys
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404306] CPU 31
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404308] Modules linked in:
xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip
xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6
xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG xt_limit xt_hashcounter
ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64
twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160
crypto_null af_key iptable_mangle ip_set arptable_filter arp_tables
iptable_raw iptable_nat nfnetlink_log nfnetlink ipt_ULOG ipt_PORTMAP
af_packet zlib zlib_deflate sha512_generic sha256_generic sha1_generic md5
icp_qa_al pcie8120 rte_kni pfe_pep virtio_rte virtio_shm virtio_vtnet
virtio_uio igb_uio virtio_ring virtio uio xt_tcpudp xt_state xt_pkttype
nf_conntrack_control bonding binfmt_misc iptable_filter ip6table_filter
ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4
nf_defrag_ipv4 ip_tables x_tables mperf ipmi_devintf ipmi_si
ipmi_msghandler edd nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp
stp llc gb_sys usb_storage uas iTCO_wdt ioatdma pcspkr iTCO_vendor_support
ixgbe igb wmi i2c_i801 mdio dca sg button container ipv6 autofs4 usbhid
ehci_hcd megasr(P) usbcore processor thermal_sys
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404373]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404376] Pid: 6605, comm:
kni_thread Tainted: P            3.1.10-gb20-default #1 Intel Corporation
S2600CO/S2600CO
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404380] RIP:
0010:[<ffffffff81020650>]  [<ffffffff81020650>] __ticket_spin_lock+0x18/0x1b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404389] RSP:
0018:ffff88083ede3cf0  EFLAGS: 00000297
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404391] RAX:
00000000000069bd RBX: 0000000000000000 RCX: 000000000000000e
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404393] RDX:
00000000000069bc RSI: 000000000000000e RDI: ffff88041e56a484
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404395] RBP:
ffff88041e56a484 R08: ffff88041e56a740 R09: ffff880808f20440
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404397] R10:
ffff88080d395084 R11: 000000000000001f R12: ffff88083ede3c68
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404400] R13:
ffffffff813f831e R14: ffff88041e56a484 R15: ffff88080b97d0c0
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404402] FS:
 0000000000000000(0000) GS:ffff88083ede0000(0000) knlGS:0000000000000000
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404405] CS:  0010 DS: 0000
ES: 0000 CR0: 000000008005003b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404407] CR2:
00007f0ad3e5e000 CR3: 0000000001805000 CR4: 00000000000406e0
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404409] DR0:
0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404412] DR3:
0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404414] Process kni_thread
(pid: 6605, threadinfo ffff88080cab8000, task ffff8808138562c0)
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404416] Stack:
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404418]  ffffffff8106b766
ffffffffa05e3a1e 0000000000000000 0000000000000000
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404424]  0000002e00000000
ffff88042488a000 0000000000000000 ffff88042488a000
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404429]  ffffffff8192a870
0000000000000608 0000000000000000 ffffffff81928b00
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404435] Call Trace:
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404446]
 [<ffffffff8106b766>] do_raw_spin_lock+0x5/0x8
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404454]
 [<ffffffffa05e3a1e>] packet_rcv+0x254/0x2ab [af_packet]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404477]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404482]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404487]
 [<ffffffff8133979e>] napi_skb_finish+0x1c/0x31
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404497]
 [<ffffffffa031adee>] igb_clean_rx_irq+0x30d/0x39e [igb]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404517]
 [<ffffffffa031aecd>] igb_poll+0x4e/0x74 [igb]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404532]
 [<ffffffff81339c88>] net_rx_action+0x65/0x178
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404538]
 [<ffffffff81045c73>] __do_softirq+0xb2/0x19d
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404544]
 [<ffffffff813f9aac>] call_softirq+0x1c/0x30
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404550]
 [<ffffffff81003931>] do_softirq+0x3c/0x7b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404555]
 [<ffffffff81045f98>] irq_exit+0x3c/0xac
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404558]
 [<ffffffff81003655>] do_IRQ+0x82/0x98
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404565]
 [<ffffffff813f24ee>] common_interrupt+0x6e/0x6e
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404573]
 [<ffffffffa05e0003>] atomic_inc+0x3/0x4 [af_packet]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404579]
 [<ffffffffa05e3a33>] packet_rcv+0x269/0x2ab [af_packet]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404477]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404482]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404487]
 [<ffffffff8133979e>] napi_skb_finish+0x1c/0x31
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404589]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404593]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404610]
 [<ffffffffa041bd4b>] kni_net_rx_normal+0x12d/0x178 [rte_kni]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404690]
 [<ffffffffa041ae58>] kni_thread+0x39/0x91 [rte_kni]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404758]
 [<ffffffff8105975a>] kthread+0x76/0x7e
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404763]
 [<ffffffff813f99b4>] kernel_thread_helper+0x4/0x10
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404766] Code: b7 c9 40 0f
b6 ff 48 89 c2 44 89 ce e9 8e fb ff ff 90 90 b8 00 00 01 00 f0 0f c1 07 0f
b7 d0 c1 e8 10 39 c2 74 07 f3 90 0f b7 17 <eb> f5 c3 8b 07 89 c2 c1 c0 10
39 c2 8d 90 00 00 01 00 75 04 f0
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404795] Call Trace:
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404800]
 [<ffffffff8106b766>] do_raw_spin_lock+0x5/0x8
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404805]
 [<ffffffffa05e3a1e>] packet_rcv+0x254/0x2ab [af_packet]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404814]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404818]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404822]
 [<ffffffff8133979e>] napi_skb_finish+0x1c/0x31
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404831]
 [<ffffffffa031adee>] igb_clean_rx_irq+0x30d/0x39e [igb]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404849]
 [<ffffffffa031aecd>] igb_poll+0x4e/0x74 [igb]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404863]
 [<ffffffff81339c88>] net_rx_action+0x65/0x178
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404868]
 [<ffffffff81045c73>] __do_softirq+0xb2/0x19d
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404872]
 [<ffffffff813f9aac>] call_softirq+0x1c/0x30
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404875]
 [<ffffffff81003931>] do_softirq+0x3c/0x7b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404880]
 [<ffffffff81045f98>] irq_exit+0x3c/0xac
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404883]
 [<ffffffff81003655>] do_IRQ+0x82/0x98
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404887]
 [<ffffffff813f24ee>] common_interrupt+0x6e/0x6e
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404893]
 [<ffffffffa05e0003>] atomic_inc+0x3/0x4 [af_packet]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404899]
 [<ffffffffa05e3a33>] packet_rcv+0x269/0x2ab [af_packet]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404908]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404912]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404921]
 [<ffffffffa041bd4b>] kni_net_rx_normal+0x12d/0x178 [rte_kni]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.404996]
 [<ffffffffa041ae58>] kni_thread+0x39/0x91 [rte_kni]
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.405064]
 [<ffffffff8105975a>] kthread+0x76/0x7e
Aug 26 09:32:00 at-vie01a-cq21b kernel: [115455.405068]
 [<ffffffff813f99b4>] kernel_thread_helper+0x4/0x10
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172014] BUG: soft lockup -
CPU#0 stuck for 22s! [gis:14145]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172017] Modules linked in:
xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip
xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6
xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG xt_limit xt_hashcounter
ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64
twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160
crypto_null af_key iptable_mangle ip_set arptable_filter arp_tables
iptable_raw iptable_nat nfnetlink_log nfnetlink ipt_ULOG ipt_PORTMAP
af_packet zlib zlib_deflate sha512_generic sha256_generic sha1_generic md5
icp_qa_al pcie8120 rte_kni pfe_pep virtio_rte virtio_shm virtio_vtnet
virtio_uio igb_uio virtio_ring virtio uio xt_tcpudp xt_state xt_pkttype
nf_conntrack_control bonding binfmt_misc iptable_filter ip6table_filter
ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4
nf_defrag_ipv4 ip_tables x_tables mperf ipmi_devintf ipmi_si
ipmi_msghandler edd nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp
stp llc gb_sys usb_storage uas iTCO_wdt ioatdma pcspkr iTCO_vendor_support
ixgbe igb wmi i2c_i801 mdio dca sg button container ipv6 autofs4 usbhid
ehci_hcd megasr(P) usbcore processor thermal_sys
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172098] CPU 0
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172099] Modules linked in:
xt_sharedlimit xt_hashlimit ip_set_hash_ipport ip_set_hash_ipportip
xt_NOTRACK ip_set_bitmap_port xt_sctp nf_conntrack_ipv6 nf_defrag_ipv6
xt_CT arpt_mangle ip_set_hash_ipnet xt_NFLOG xt_limit xt_hashcounter
ip_set_hash_ipip xt_set ip_set_hash_ip deflate ctr twofish_x86_64
twofish_common camellia serpent blowfish cast5 des_generic cbc xcbc rmd160
crypto_null af_key iptable_mangle ip_set arptable_filter arp_tables
iptable_raw iptable_nat nfnetlink_log nfnetlink ipt_ULOG ipt_PORTMAP
af_packet zlib zlib_deflate sha512_generic sha256_generic sha1_generic md5
icp_qa_al pcie8120 rte_kni pfe_pep virtio_rte virtio_shm virtio_vtnet
virtio_uio igb_uio virtio_ring virtio uio xt_tcpudp xt_state xt_pkttype
nf_conntrack_control bonding binfmt_misc iptable_filter ip6table_filter
ip6_tables nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack_ipv4
nf_defrag_ipv4 ip_tables x_tables mperf ipmi_devintf ipmi_si
ipmi_msghandler edd nf_conntrack_proto_sctp nf_conntrack sctp 8021q garp
stp llc gb_sys usb_storage uas iTCO_wdt ioatdma pcspkr iTCO_vendor_support
ixgbe igb wmi i2c_i801 mdio dca sg button container ipv6 autofs4 usbhid
ehci_hcd megasr(P) usbcore processor thermal_sys
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172163]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172166] Pid: 14145, comm:
gis Tainted: P            3.1.10-gb20-default #1 Intel Corporation
S2600CO/S2600CO
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172170] RIP:
0010:[<ffffffff8102064d>]  [<ffffffff8102064d>] __ticket_spin_lock+0x15/0x1b
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172178] RSP:
0000:ffff88043ee03cf0  EFLAGS: 00000293
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172180] RAX:
00000000000069bf RBX: 00000000020110ac RCX: 000000000000000e
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172182] RDX:
00000000000069bc RSI: 000000000000000e RDI: ffff88041e56a484
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172184] RBP:
ffff88041e56a484 R08: ffff88041e56a740 R09: ffff8804154a5840
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172187] R10:
00007f0afce77000 R11: 0000000000000000 R12: ffff88043ee03c68
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172189] R13:
ffffffff813f831e R14: ffff88041e56a484 R15: ffff88041e568280
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172192] FS:
 00007f0afd70b700(0000) GS:ffff88043ee00000(0000) knlGS:0000000000000000
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172194] CS:  0010 DS: 0000
ES: 0000 CR0: 0000000080050033
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172196] CR2:
00007f54f6b88098 CR3: 000000042427e000 CR4: 00000000000406f0
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172199] DR0:
0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172201] DR3:
0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172204] Process gis (pid:
14145, threadinfo ffff88037537e000, task ffff88036a8fe180)
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172205] Stack:
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172207]  ffffffff8106b766
ffffffffa05e3a1e 0000000101b72e68 ffff8808260ae680
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172213]  0000002e1e568280
ffff880420450000 ffff88041f887a00 ffff880420450000
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172218]  ffffffff8192a870
0000000000000608 0000000000000000 ffffffff81928b00
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172224] Call Trace:
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172233]
 [<ffffffff8106b766>] do_raw_spin_lock+0x5/0x8
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172240]
 [<ffffffffa05e3a1e>] packet_rcv+0x254/0x2ab [af_packet]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172257]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172262]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172266]
 [<ffffffff8133979e>] napi_skb_finish+0x1c/0x31
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172277]
 [<ffffffffa031adee>] igb_clean_rx_irq+0x30d/0x39e [igb]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172298]
 [<ffffffffa031aecd>] igb_poll+0x4e/0x74 [igb]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172313]
 [<ffffffff81339c88>] net_rx_action+0x65/0x178
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172319]
 [<ffffffff81045c73>] __do_softirq+0xb2/0x19d
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172324]
 [<ffffffff813f9aac>] call_softirq+0x1c/0x30
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172329]
 [<ffffffff81003931>] do_softirq+0x3c/0x7b
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172333]
 [<ffffffff81045f98>] irq_exit+0x3c/0xac
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172337]
 [<ffffffff81003655>] do_IRQ+0x82/0x98
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172342]
 [<ffffffff813f24ee>] common_interrupt+0x6e/0x6e
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172351]
 [<00007f0c560356d1>] 0x7f0c560356d0
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172353] Code: ff 45 0f b7
c9 40 0f b6 ff 48 89 c2 44 89 ce e9 8e fb ff ff 90 90 b8 00 00 01 00 f0 0f
c1 07 0f b7 d0 c1 e8 10 39 c2 74 07 f3 90 <0f> b7 17 eb f5 c3 8b 07 89 c2
c1 c0 10 39 c2 8d 90 00 00 01 00
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172382] Call Trace:
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172386]
 [<ffffffff8106b766>] do_raw_spin_lock+0x5/0x8
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172392]
 [<ffffffffa05e3a1e>] packet_rcv+0x254/0x2ab [af_packet]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172402]
 [<ffffffff81337bbf>] __netif_receive_skb+0x2e1/0x36b
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172406]
 [<ffffffff81339722>] netif_receive_skb+0x7e/0x84
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172410]
 [<ffffffff8133979e>] napi_skb_finish+0x1c/0x31
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172418]
 [<ffffffffa031adee>] igb_clean_rx_irq+0x30d/0x39e [igb]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172436]
 [<ffffffffa031aecd>] igb_poll+0x4e/0x74 [igb]
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172450]
 [<ffffffff81339c88>] net_rx_action+0x65/0x178
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172454]
 [<ffffffff81045c73>] __do_softirq+0xb2/0x19d
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172459]
 [<ffffffff813f9aac>] call_softirq+0x1c/0x30
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172462]
 [<ffffffff81003931>] do_softirq+0x3c/0x7b
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172467]
 [<ffffffff81045f98>] irq_exit+0x3c/0xac
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172470]
 [<ffffffff81003655>] do_IRQ+0x82/0x98
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172474]
 [<ffffffff813f24ee>] common_interrupt+0x6e/0x6e
Aug 26 09:32:01 at-vie01a-cq21b kernel: [115456.172480]
 [<00007f0c560356d1>] 0x7f0c560356d0



Judging by the backtrace, this sounds more like some sort of a bug in the
igb network interface driver or the network packet driver af_packet. Your
gis userland process is probably the main thing that talks to the network
on that machine, so it appears connected, but soft lockups are really
kernel space bugs.

is my analysis right?
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