I've found a reproducible bug in 3.8.0 kernels installed in precise.
We did an EFI install and it used this newer kernel which seemed to be selected from:
linux-signed-generic-lts-raring
dmesg output:
[366681.745292] general protection fault: 0000 [#1] SMP
[366681.745640] Modules linked in: btrfs(F) ufs(F) qnx4(F) hfsplus(F) hfs(F) minix(F) ntfs(F) msdos(F) jfs(F) xfs(F) libcrc32c(F)
reiserfs(F) vhost_net(F) macvtap(F) macvlan(F) ip6table_filter(F) ip6_tables(F) iptable_filter(F) ip_tables(F) ipmi_devintf(F) ebt
able_nat(F) ebtables(F) x_tables(F) ipmi_si(F) ipmi_msghandler(F) coretemp(F) kvm_intel(F) kvm(F) ghash_clmulni_intel(F) aesni_int
el(F) ablk_helper(F) cryptd(F) lrw(F) bridge(F) aes_x86_64(F) xts(F) gf128mul(F) stp(F) llc(F) gpio_ich(F) dm_multipath(F) scsi_dh
(F) sb_edac(F) microcode(F) edac_core(F) ioatdma(F) mei(F) joydev(F) lpc_ich(F) nfsd(F) mac_hid(F) wmi(F) nfs_acl(F) auth_rpcgss(F
) nfs(F) lp(F) parport(F) fscache(F) lockd(F) sunrpc(F) nls_iso8859_1(F) ext2(F) zfs(POF) zcommon(POF) znvpair(POF) zavl(POF) zuni
code(POF) spl(OF) zlib_deflate(F) ses(F) enclosure(F) hid_generic(F) igb(F) mpt2sas(F) usbhid(F) ahci(F) dca(F) ptp(F) scsi_transp
ort_sas(F) hid(F) megaraid_sas(F) libahci(F) pps_core(F) raid_class(F)
[366681.752501] CPU 18
[366681.752644] Pid: 5937, comm: vhost-9024 Tainted: PF O 3.8.0-29-generic #42~precise1-Ubuntu Supermicro X9DRD-7LN4F(-JB
OD)/X9DRD-EF/X9DRD-7LN4F
[366681.753558] RIP: 0010:[<ffffffff816df39e>] [<ffffffff816df39e>] put_compound_page.part.12+0x34/0x11f
[366681.754192] RSP: 0018:ffff88178840bbb8 EFLAGS: 00010292
[366681.754547] RAX: ffff8817d750b200 RBX: 2424242424242424 RCX: ffff8817d750b6c0
[366681.755033] RDX: 0000000000000000 RSI: ffff8817d750b600 RDI: ffff8817d750b600
[366681.755514] RBP: ffff88178840bbc8 R08: 0000000000000001 R09: 0000000000001000
[366681.755995] R10: ffff8817689a4518 R11: 0000000000000001 R12: ffff8817d750b600
[366681.756474] R13: 000000000000edd2 R14: ffffffff814f354b R15: 0000000000000042
[366681.756957] FS: 0000000000000000(0000) GS:ffff88207fcc0000(0000) knlGS:0000000000000000
[366681.757500] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[366681.757886] CR2: 00007fa51d6e6590 CR3: 0000002027561000 CR4: 00000000000427e0
[366681.758380] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[366681.759020] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[366681.759480] Process vhost-9024 (pid: 5937, threadinfo ffff88178840a000, task ffff88101ad5dd00)
[366681.759962] Stack:
[366681.760103] ffff881f86698f00 0000000000000012 ffff88178840bbd8 ffffffff81141b7c
[366681.760646] ffff88178840bbe8 ffffffff81141f4c ffff88178840bc08 ffffffff815d57a8
[366681.761188] ffff881f86698f00 ffff881f86698f00 ffff88178840bc18 ffffffff815d58c5
[366681.761725] Call Trace:
[366681.761899] [<ffffffff81141b7c>] put_compound_page+0x3c/0x50
[366681.777499] [<ffffffff81141f4c>] put_page+0x2c/0x40
[366681.795022] [<ffffffff815d57a8>] skb_release_data.part.43+0x48/0x110
[366681.811077] [<ffffffff815d58c5>] skb_release_data+0x55/0x60
[366681.826501] [<ffffffff815d58ee>] __kfree_skb+0x1e/0x30
[366681.841922] [<ffffffff815d5945>] kfree_skb+0x45/0xc0
[366681.856525] [<ffffffff814f354b>] tun_get_user+0x61b/0x640
[366681.871554] [<ffffffff814f35c4>] tun_sendmsg+0x54/0x80
[366681.885502] [<ffffffffa04b8ca7>] handle_tx+0x307/0x5e0 [vhost_net]
[366681.899875] [<ffffffffa04b8fb5>] handle_tx_kick+0x15/0x20 [vhost_net]
[366681.913024] [<ffffffffa04b5e9d>] vhost_worker+0xfd/0x1a0 [vhost_net]
[366681.926011] [<ffffffffa04b5da0>] ? vhost_set_memory+0x130/0x130 [vhost_net]
[366681.939190] [<ffffffff8107f1b0>] kthread+0xc0/0xd0
[366681.951561] [<ffffffff8107f0f0>] ? flush_kthread_worker+0xb0/0xb0
[366681.964097] [<ffffffff816fc82c>] ret_from_fork+0x7c/0xb0
[366681.976040] [<ffffffff8107f0f0>] ? flush_kthread_worker+0xb0/0xb0
[366681.988050] Code: 41 54 49 89 fc 53 48 8b 07 f6 c4 80 0f 84 9f 00 00 00 48 8b 5f 30 48 8b 07 f6 c4 80 0f 84 8f 00 00 00 48 39
df 0f 84 86 00 00 00 <8b> 53 1c 85 d2 74 7f 8d 4a 01 48 8d 73 1c 89 d0 f0 0f b1 4b 1c
[366682.024399] RIP [<ffffffff816df39e>] put_compound_page.part.12+0x34/0x11f
[366682.036323] RSP <ffff88178840bbb8>
[366682.073799] ---[ end trace ab95cd543919cb1f ]---
reproduced by doing an nfs export from zfs running on the host (It is possible it is related to zfs, but it doesn't show up in the call trace).
I've reproduced it on two similar machines.
I've also checked it against newer version of qemu (1.5) didn't resolve the problem.
---
AlsaDevices:
total 0
crw-rw---T 1 root audio 116, 1 Apr 1 16:05 seq
crw-rw---T 1 root audio 116, 33 Apr 1 16:05 timer
AplayDevices: Error: [Errno 2] No such file or directory
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
DistroRelease: Ubuntu 12.04
HibernationDevice: RESUME=UUID=f4017433-9f60-4939-ba37-8857f8141707
InstallationMedia: Ubuntu-Server 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.2)
Lsusb:
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd
MachineType: Supermicro X9DRD-7LN4F(-JBOD)/X9DRD-EF
MarkForUpload: True
NonfreeKernelModules: zfs zcommon znvpair zavl zunicode
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-37-generic.efi.signed root=/dev/mapper/hostname--vg-root ro
ProcVersionSignature: Ubuntu 3.8.0-37.53~precise1-generic 3.8.13.18
RelatedPackageVersions:
linux-restricted-modules-3.8.0-37-generic N/A
linux-backports-modules-3.8.0-37-generic N/A
linux-firmware 1.79.10
RfKill: Error: [Errno 2] No such file or directory
Tags: precise
Uname: Linux 3.8.0-37-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
WifiSyslog:
dmi.bios.date: 07/09/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3.0
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: X9DRD-7LN4F
dmi.board.vendor: Supermicro
dmi.board.version: REV:1.02
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0:bd07/09/2013:svnSupermicro:pnX9DRD-7LN4F(-JBOD)/X9DRD-EF:pvr0123456789:rvnSupermicro:rnX9DRD-7LN4F:rvrREV1.02:cvnSupermicro:ct3:cvr0123456789:
dmi.product.name: X9DRD-7LN4F(-JBOD)/X9DRD-EF
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1301439
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.