Chris, I work with Steve and was able to reproduce with the lockdep debugging, the output as follows:
[18075576.538133] BUG: unable to handle kernel paging request at ffffc900038ebac8 [18075576.538153] IP: [<ffffffffa013d1a1>] nf_nat_cleanup_conntrack+0x41/0x70 [nf_nat] [18075576.538166] PGD 1b6428067 PUD 1b6429067 PMD 152eae067 PTE 0 [18075576.538176] Oops: 0002 [#1] SMP [18075576.538183] Modules linked in: xt_nat veth tcp_diag inet_diag xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat bridge stp llc xt_owner isofs ipt_REJECT xt_LOG xt_limit nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_conntrack nf_conntrack iptable_filter ip_tables x_tables dm_crypt microcode raid10 raid456 async_memcpy async_raid6_recov async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear [18075576.538246] CPU: 6 PID: 6 Comm: kworker/u16:0 Not tainted 3.15.0-0-generic #1~lp1314274 [18075576.538260] Workqueue: netns cleanup_net [18075576.538267] task: ffff8801b3a04440 ti: ffff8801b3a0a000 task.ti: ffff8801b3a0a000 [18075576.538274] RIP: e030:[<ffffffffa013d1a1>] [<ffffffffa013d1a1>] nf_nat_cleanup_conntrack+0x41/0x70 [nf_nat] [18075576.538285] RSP: e02b:ffff8801b3a0bc00 EFLAGS: 00010246 [18075576.538291] RAX: 0000000000000000 RBX: ffff8800eee261b0 RCX: 00000000040003fe [18075576.538299] RDX: ffffc900038ebac8 RSI: 000000000000035c RDI: ffffffffa0141100 [18075576.538305] RBP: ffff8801b3a0bc08 R08: 0000000000000000 R09: 0000000000000000 [18075576.538312] R10: 0000000000000001 R11: 0000000000000000 R12: ffff8800eee26100 [18075576.538319] R13: ffff8801b238c000 R14: 000000000004c2b8 R15: ffff8801b238c048 [18075576.538330] FS: 00007f3bdf8d8740(0000) GS:ffff8801bed80000(0000) knlGS:0000000000000000 [18075576.538337] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b [18075576.538343] CR2: ffffc900038ebac8 CR3: 000000008c774000 CR4: 0000000000002660 [18075576.538350] Stack: [18075576.538354] 0000000000000001 ffff8801b3a0bc38 ffffffffa00ce852 ffffffffa00ce813 [18075576.538364] ffff8801b238c000 ffff8801b20b8000 ffff8801b238c000 ffff8801b3a0bc58 [18075576.538374] ffffffffa00c5415 ffff8801b238c000 ffff8801b20b8000 ffff8801b3a0bc80 [18075576.538384] Call Trace: [18075576.538399] [<ffffffffa00ce852>] __nf_ct_ext_destroy+0x72/0xa0 [nf_conntrack] [18075576.538413] [<ffffffffa00ce813>] ? __nf_ct_ext_destroy+0x33/0xa0 [nf_conntrack] [18075576.538424] [<ffffffffa00c5415>] nf_conntrack_free+0x25/0x60 [nf_conntrack] [18075576.538435] [<ffffffffa00c706d>] destroy_conntrack+0xdd/0x130 [nf_conntrack] [18075576.538447] [<ffffffffa00c6fb7>] ? destroy_conntrack+0x27/0x130 [nf_conntrack] [18075576.538458] [<ffffffff8167df55>] nf_conntrack_destroy+0x45/0x70 [18075576.538466] [<ffffffff8167df15>] ? nf_conntrack_destroy+0x5/0x70 [18075576.538477] [<ffffffffa00cb190>] ? nf_conntrack_helper_fini+0x30/0x30 [nf_conntrack] [18075576.538488] [<ffffffffa00c6b53>] nf_ct_iterate_cleanup+0x203/0x230 [nf_conntrack] [18075576.538501] [<ffffffffa00cb32d>] nf_ct_l3proto_pernet_unregister+0x1d/0x20 [nf_conntrack] [18075576.538512] [<ffffffffa00b62f9>] ipv4_net_exit+0x19/0x50 [nf_conntrack_ipv4] [18075576.538522] [<ffffffff81642539>] ops_exit_list.isra.1+0x39/0x60 [18075576.538530] [<ffffffff81642f28>] cleanup_net+0x108/0x1e0 [18075576.538541] [<ffffffff810838e4>] process_one_work+0x1f4/0x510 [18075576.538548] [<ffffffff81083882>] ? process_one_work+0x192/0x510 [18075576.538556] [<ffffffff810845f1>] worker_thread+0x121/0x3a0 [18075576.538566] [<ffffffff810844d0>] ? manage_workers.isra.24+0x2a0/0x2a0 [18075576.538574] [<ffffffff8108affc>] kthread+0xfc/0x120 [18075576.538581] [<ffffffff8108af00>] ? kthread_create_on_node+0x230/0x230 [18075576.538590] [<ffffffff8176da7c>] ret_from_fork+0x7c/0xb0 [18075576.538596] [<ffffffff8108af00>] ? kthread_create_on_node+0x230/0x230 [18075576.538601] Code: 0f b7 58 12 66 85 db 74 45 48 01 c3 74 40 48 83 7b 10 00 74 39 48 c7 c7 00 11 14 a0 e8 29 6e 62 e1 48 8b 03 48 8b 53 08 48 85 c0 <48> 89 02 74 04 48 89 50 08 48 b8 00 02 20 00 00 00 ad de 48 c7 [18075576.538659] RIP [<ffffffffa013d1a1>] nf_nat_cleanup_conntrack+0x41/0x70 [nf_nat] [18075576.538668] RSP <ffff8801b3a0bc00> [18075576.538672] CR2: ffffc900038ebac8 [18075576.538682] ---[ end trace 0fff0eb21b543ad6 ]--- [18075576.538687] Kernel panic - not syncing: Fatal exception in interrupt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1314274 Title: BUG in nf_nat_cleanup_conntrack Status in The Linux Kernel: Unknown Status in “linux” package in Ubuntu: Confirmed Bug description: Seeing this bug, which has been reported upstream: https://bugzilla.kernel.org/show_bug.cgi?id=65191 Our stacktrace: [17792296.022138] BUG: unable to handle kernel paging request at ffffc9000340a750 [17792296.022161] IP: [<ffffffffa0137200>] nf_nat_cleanup_conntrack+0x40/0x70 [nf_nat] [17792296.022173] PGD 1b6426067 PUD 1b6427067 PMD 156481067 PTE 0 [17792296.022196] Oops: 0002 [#1] SMP [17792296.022205] Modules linked in: xt_nat veth tcp_diag inet_diag xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat bridge stp llc xt_owner ipt_REJECT xt_LOG xt_limit nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_conntrack nf_conntrack iptable_filter ip_tables x_tables isofs dm_crypt raid10 raid456 async_memcpy async_raid6_recov async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear [17792296.022254] CPU: 4 PID: 6 Comm: kworker/u16:0 Not tainted 3.13.0-24-generic #46-Ubuntu [17792296.022267] Workqueue: netns cleanup_net [17792296.022271] task: ffff8801b39e0000 ti: ffff8801b39dc000 task.ti: ffff8801b39dc000 [17792296.022276] RIP: e030:[<ffffffffa0137200>] [<ffffffffa0137200>] nf_nat_cleanup_conntrack+0x40/0x70 [nf_nat] [17792296.022286] RSP: e02b:ffff8801b39ddcb8 EFLAGS: 00010246 [17792296.022290] RAX: 0000000000000000 RBX: ffff880081691508 RCX: ffff8801b26b8988 [17792296.022297] RDX: ffffc9000340a750 RSI: 000000001e321e30 RDI: ffffffffa013a4c0 [17792296.022302] RBP: ffff8801b39ddcc0 R08: 0000000000000200 R09: 0000000000000000 [17792296.022306] R10: 0000000000007ff0 R11: 0000000000000005 R12: ffff880081691480 [17792296.022312] R13: ffff8800c07d0000 R14: ffff8800c07d0008 R15: ffff8801b26b8000 [17792296.022324] FS: 00007fcd1d936740(0000) GS:ffff8801bed00000(0000) knlGS:0000000000000000 [17792296.022329] CS: e033 DS: 0000 ES: 0000 CR0: 000000008005003b [17792296.022333] CR2: ffffc9000340a750 CR3: 0000000001c0e000 CR4: 0000000000002660 [17792296.022339] Stack: [17792296.022342] 0000000000000001 ffff8801b39ddce8 ffffffffa00f15a4 ffff8800c07d0000 [17792296.022351] ffff8801b26b8000 ffffffffa00b92c0 ffff8801b39ddd08 ffffffffa00e92d5 [17792296.022358] ffff8800c07d0000 ffff8801b26b8000 ffff8801b39ddd28 ffffffffa00ea7b4 [17792296.022366] Call Trace: [17792296.022379] [<ffffffffa00f15a4>] __nf_ct_ext_destroy+0x44/0x60 [nf_conntrack] [17792296.022388] [<ffffffffa00e92d5>] nf_conntrack_free+0x25/0x60 [nf_conntrack] [17792296.022397] [<ffffffffa00ea7b4>] destroy_conntrack+0xb4/0x110 [nf_conntrack] [17792296.022407] [<ffffffffa00ee260>] ? nf_conntrack_helper_fini+0x30/0x30 [nf_conntrack] [17792296.022415] [<ffffffff81649d77>] nf_conntrack_destroy+0x17/0x20 [17792296.022423] [<ffffffffa00ea23b>] nf_ct_iterate_cleanup+0x12b/0x150 [nf_conntrack] [17792296.022433] [<ffffffffa00ee53d>] nf_ct_l3proto_pernet_unregister+0x1d/0x20 [nf_conntrack] [17792296.022441] [<ffffffffa00b7309>] ipv4_net_exit+0x19/0x50 [nf_conntrack_ipv4] [17792296.022448] [<ffffffff81612b49>] ops_exit_list.isra.1+0x39/0x60 [17792296.022453] [<ffffffff816133d0>] cleanup_net+0x110/0x250 [17792296.022464] [<ffffffff810838a2>] process_one_work+0x182/0x450 [17792296.022470] [<ffffffff81084641>] worker_thread+0x121/0x410 [17792296.022476] [<ffffffff81084520>] ? rescuer_thread+0x3e0/0x3e0 [17792296.022483] [<ffffffff8108b312>] kthread+0xd2/0xf0 [17792296.022488] [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0 [17792296.022496] [<ffffffff8172637c>] ret_from_fork+0x7c/0xb0 [17792296.022501] [<ffffffff8108b240>] ? kthread_create_on_node+0x1d0/0x1d0 [17792296.022505] Code: 53 0f b6 58 11 84 db 74 45 48 01 c3 74 40 48 83 7b 10 00 74 39 48 c7 c7 c0 a4 13 a0 e8 0a 68 5e e1 48 8b 03 48 8b 53 08 48 85 c0 <48> 89 02 74 04 48 89 50 08 48 b8 00 02 20 00 00 00 ad de 48 c7 [17792296.022550] RIP [<ffffffffa0137200>] nf_nat_cleanup_conntrack+0x40/0x70 [nf_nat] [17792296.022557] RSP <ffff8801b39ddcb8> [17792296.022560] CR2: ffffc9000340a750 [17792296.022569] ---[ end trace 321f62b987d4a83b ]--- [17792296.022573] Kernel panic - not syncing: Fatal exception in interrupt ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-24-generic 3.13.0-24.46 ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC3: sconklin 2706 F.... pulseaudio /dev/snd/controlC2: sconklin 2706 F.... pulseaudio /dev/snd/controlC1: sconklin 2706 F.... pulseaudio /dev/snd/controlC0: sconklin 2706 F.... pulseaudio CurrentDesktop: Unity Date: Tue Apr 29 11:25:06 2014 HibernationDevice: RESUME=UUID=e701c443-34ca-4e0f-bd28-86dbe9ace3ab InstallationDate: Installed on 2014-02-19 (68 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140218) MachineType: ASUS All Series ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=1cb2ef0d-01b3-450f-bfd1-5fb647a3cb30 ro quiet splash crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/20/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1102 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: MAXIMUS VI GENE dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1102:bd11/20/2013:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnMAXIMUSVIGENE:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: All Series dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1314274/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
