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[Bug 1377851] Re: Kernel panic skb_segment+0x5d7/0x980

 

** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty

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https://bugs.launchpad.net/bugs/1377851

Title:
  Kernel panic skb_segment+0x5d7/0x980

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  On two Ubuntu 14.04 amd64 servers with tg3 NICs acting as a openvpn gateway we recently had a lot of trouble with kernel panics (linux-image-3.13.0-36-generic 3.13.0-36.63)
  The panics were kind of random happening sometimes already during the boot process and sometimes a couple of hours later.
  The boxes were running perfectly find for a couple of months before. We believe some kind of "special" packet triggered the bug.

  Potential related bugs:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1331219
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1313591

  Upgrading to linux-image-3.16.3-031603-generic
  (3.16.3-031603.201409171435) solved the problem for us.

  [ 6076.726520] BUG: unable to handle kernel NULL pointer dereference at 000000000000006c
  [ 6076.737716] IP: [<ffffffff81616787>] skb_segment+0x5d7/0x980
  [ 6076.745780] PGD 0 
  [ 6076.748641] Oops: 0000 [#1] SMP 
  [ 6076.753268] Modules linked in: btrfs ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c cdc_ether usbnet mii mpt3sas mpt2sas raid_class scsi_transport_sas mptctl mptbase ipmi_si ipmi_devintf dell_rbu gpio_ich intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp dcdbas kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd 8021q garp stp mrp llc sb_edac edac_core shpchp joydev pl2303 usbserial lpc_ich wmi mei_me mei mac_hid acpi_power_meter ioatdma nf_conntrack dca lp parport raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 tg3 ahci hid_generic raid0 ptp usbhid multipath hid libahci pps_core linear [last unloaded: ipmi_si]
  [ 6076.850743] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 3.13.0-36-generic #63-Ubuntu
  [ 6076.861485] Hardware name: Dell Inc. PowerEdge R620/0PXXHP, BIOS 1.6.0 03/07/2013
  [ 6076.872104] task: ffff880223841800 ti: ffff880223848000 task.ti: ffff880223848000
  [ 6076.882722] RIP: 0010:[<ffffffff81616787>]  [<ffffffff81616787>] skb_segment+0x5d7/0x980
  [ 6076.894243] RSP: 0018:ffff880227263790  EFLAGS: 00010246
  [ 6076.901769] RAX: 0000000000000646 RBX: ffff88021f03f000 RCX: ffff8801ed4fff00
  [ 6076.911893] RDX: 0000000000000646 RSI: 00000000000000c2 RDI: ffffea0007f6de00
  [ 6076.971665] RBP: ffff880227263858 R08: 000000000000fff6 R09: 0000000000000001
  [ 6077.031463] R10: ffff88021f03e800 R11: 0000000000010552 R12: ffff8801fdb1fc80
  [ 6077.091313] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000646
  [ 6077.151619] FS:  0000000000000000(0000) GS:ffff880227260000(0000) knlGS:0000000000000000
  [ 6077.262424] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 6077.320083] CR2: 000000000000006c CR3: 0000000001c0e000 CR4: 00000000000407e0
  [ 6077.379854] Stack:
  [ 6077.433555]  ffffffff811a48f9 ffff8802272772c0 000000000000fff6 ffffffffffff000a
  [ 6077.546280]  ffffffff00010552 000000000000006a ffff88021f03e800 0000000100000020
  [ 6077.658915]  ffffffffffffffe4 0000000000010012 0000001c0000055c ffff88021f03f000
  [ 6077.771400] Call Trace:
  [ 6077.824494]  <IRQ> 
  [ 6077.827251]  [<ffffffff811a48f9>] ? __kmalloc_node_track_caller+0xb9/0x290
  [ 6077.933211]  [<ffffffff8168149d>] tcp_gso_segment+0x10d/0x3f0
  [ 6077.988641]  [<ffffffff81691822>] inet_gso_segment+0x132/0x360
  [ 6078.043154]  [<ffffffff810a5db2>] ? enqueue_task_fair+0x422/0x6c0
  [ 6078.097358]  [<ffffffff81623ffc>] skb_mac_gso_segment+0x9c/0x180
  [ 6078.150464]  [<ffffffff816a0fb4>] gre_gso_segment+0x134/0x370
  [ 6078.202321]  [<ffffffff8109828d>] ? ttwu_do_activate.constprop.74+0x5d/0x70
  [ 6078.255348]  [<ffffffff81691822>] inet_gso_segment+0x132/0x360
  [ 6078.306129]  [<ffffffff8109a800>] ? try_to_wake_up+0x240/0x2c0
  [ 6078.355712]  [<ffffffff81623ffc>] skb_mac_gso_segment+0x9c/0x180
  [ 6078.404660]  [<ffffffff8162413d>] __skb_gso_segment+0x5d/0xb0
  [ 6078.452918]  [<ffffffff8162444a>] dev_hard_start_xmit+0x18a/0x560
  [ 6078.501057]  [<ffffffff8164360e>] sch_direct_xmit+0xee/0x1c0
  [ 6078.548821]  [<ffffffff81624a50>] __dev_queue_xmit+0x230/0x500
  [ 6078.596793]  [<ffffffff81624d30>] dev_queue_xmit+0x10/0x20
  [ 6078.644041]  [<ffffffff8162be31>] neigh_direct_output+0x11/0x20
  [ 6078.691822]  [<ffffffff8165d370>] ip_finish_output+0x1b0/0x3b0
  [ 6078.739211]  [<ffffffff8165e8d8>] ip_output+0x58/0x90
  [ 6078.784448]  [<ffffffff8165a84b>] ip_forward_finish+0x8b/0x170
  [ 6078.830211]  [<ffffffff8165ac85>] ip_forward+0x355/0x410
  [ 6078.874484]  [<ffffffff8165899d>] ip_rcv_finish+0x7d/0x350
  [ 6078.918046]  [<ffffffff816592e8>] ip_rcv+0x298/0x3d0
  [ 6078.959829]  [<ffffffff81622bb6>] __netif_receive_skb_core+0x666/0x840
  [ 6079.003064]  [<ffffffff8101b200>] ? flush_ptrace_hw_breakpoint+0x30/0x60
  [ 6079.045844]  [<ffffffff81622da8>] __netif_receive_skb+0x18/0x60
  [ 6079.086823]  [<ffffffff81622e13>] netif_receive_skb+0x23/0x90
  [ 6079.126412]  [<ffffffff81622f24>] napi_gro_complete+0xa4/0xe0
  [ 6079.164669]  [<ffffffff816234a0>] dev_gro_receive+0x210/0x2d0
  [ 6079.203193]  [<ffffffff816237e5>] napi_gro_receive+0x25/0xb0
  [ 6079.242062]  [<ffffffffa00d8c2b>] tg3_poll_work+0xc2b/0xf30 [tg3]
  [ 6079.281003]  [<ffffffffa00d8f6b>] tg3_poll_msix+0x3b/0x140 [tg3]
  [ 6079.319178]  [<ffffffff81623192>] net_rx_action+0x152/0x250
  [ 6079.356843]  [<ffffffff8106cbac>] __do_softirq+0xec/0x2c0
  [ 6079.394099]  [<ffffffff8106d0f5>] irq_exit+0x105/0x110
  [ 6079.430844]  [<ffffffff817312d6>] do_IRQ+0x56/0xc0
  [ 6079.466888]  [<ffffffff81726a6d>] common_interrupt+0x6d/0x6d
  [ 6079.503660]  <EOI> 
  [ 6079.506415]  [<ffffffff815d11bf>] ? cpuidle_enter_state+0x4f/0xc0
  [ 6079.573717]  [<ffffffff815d12e9>] cpuidle_idle_call+0xb9/0x1f0
  [ 6079.611376]  [<ffffffff8101cede>] arch_cpu_idle+0xe/0x30
  [ 6079.648243]  [<ffffffff810bed95>] cpu_startup_entry+0xc5/0x290
  [ 6079.685771]  [<ffffffff81041018>] start_secondary+0x218/0x2c0
  [ 6079.723121] Code: 4c 24 60 eb 21 0f 1f 80 00 00 00 00 41 83 c5 01 49 83 c4 10 48 83 c1 10 41 39 c3 0f 86 83 01 00 00 41 89 c7 89 c2 45 39 e9 7f 37 <41> 8b 46 6c 41 39 46 68 0f 85 75 03 00 00 45 8b a6 cc 00 00 00 
  [ 6079.844842] RIP  [<ffffffff81616787>] skb_segment+0x5d7/0x980
  [ 6079.885283]  RSP <ffff880227263790>
  [ 6079.922830] CR2: 000000000000006c
  [ 6080.024035] ---[ end trace 6e658236aae2d239 ]---
  [ 6080.065884] Kernel panic - not syncing: Fatal exception in interrupt

  ethtool -k port1
  Features for port1:
  rx-checksumming: on
  tx-checksumming: on
          tx-checksum-ipv4: on
          tx-checksum-ip-generic: off [fixed]
          tx-checksum-ipv6: on
          tx-checksum-fcoe-crc: off [fixed]                                                                                                                                                                                                   
          tx-checksum-sctp: off [fixed]                                                                                                                                                                                                       
  scatter-gather: on                                                                                                                                                                                                                          
          tx-scatter-gather: on                                                                                                                                                                                                               
          tx-scatter-gather-fraglist: off [fixed]                                                                                                                                                                                             
  tcp-segmentation-offload: on                                                                                                                                                                                                                
          tx-tcp-segmentation: on                                                                                                                                                                                                             
          tx-tcp-ecn-segmentation: on                                                                                                                                                                                                         
          tx-tcp6-segmentation: on                                                                                                                                                                                                            
  udp-fragmentation-offload: off [fixed]                                                                                                                                                                                                      
  generic-segmentation-offload: on                                                                                                                                                                                                            
  generic-receive-offload: on                                                                                                                                                                                                                 
  large-receive-offload: off [fixed]                                                                                                                                                                                                          
  rx-vlan-offload: on [fixed]                                                                                                                                                                                                                 
  tx-vlan-offload: on [fixed]                                                                                                                                                                                                                 
  ntuple-filters: off [fixed]                                                                                                                                                                                                                 
  receive-hashing: off [fixed]                                                                                                                                                                                                                
  highdma: on                                                                                                                                                                                                                                 
  rx-vlan-filter: off [fixed]                                                                                                                                                                                                                 
  vlan-challenged: off [fixed]                                                                                                                                                                                                                
  tx-lockless: off [fixed]                                                                                                                                                                                                                    
  netns-local: off [fixed]                                                                                                                                                                                                                    
  tx-gso-robust: off [fixed]                                                                                                                                                                                                                  
  tx-fcoe-segmentation: off [fixed]                                                                                                                                                                                                           
  tx-gre-segmentation: off [fixed]                                                                                                                                                                                                            
  tx-ipip-segmentation: off [fixed]                                                                                                                                                                                                           
  tx-sit-segmentation: off [fixed]
  tx-udp_tnl-segmentation: off [fixed]
  tx-mpls-segmentation: off [fixed]
  fcoe-mtu: off [fixed]
  tx-nocache-copy: on
  loopback: off [fixed]
  rx-fcs: off [fixed]
  rx-all: off [fixed]
  tx-vlan-stag-hw-insert: off [fixed]
  rx-vlan-stag-hw-parse: off [fixed]
  rx-vlan-stag-filter: off [fixed]
  l2-fwd-offload: off [fixed]

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References