When logging out from the guest, occasionally the kvm will throw a segfault: [46953.865611] kvm[2762]: segfault at 10 ip 00007f014ead854e sp 00007fff56385cf0 error 6 in libc2.15.so[7f014ea58000+1b5000] I am using the vmvga display driver. The guest was originally a VMware Fusion guest on a Mac. The guest is using the vmdk-disk image. Some details about my system: $ lsb_release -rd Description: Ubuntu 12.04.2 LTS Release: 12.04 $ apt-cache policy kvm-ipxe kvm-ipxe: Installed: 1.0.0+git-3.55f6c88-0ubuntu1 Candidate: 1.0.0+git-3.55f6c88-0ubuntu1 Version table: *** 1.0.0+git-3.55f6c88-0ubuntu1 0 500 http://br.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status Some more logs from a former situation: /var/log/kern.log Feb 6 10:29:24 box kernel: [222277.878253] kvm[2613]: segfault at 10 ip 00007fae8fe3d54e sp 00007fff900e1c50 error 6 in libc-2.15.so[7fae8fdbd000+1b5000] Feb 6 10:32:39 box kernel: [222472.636725] INFO: task kvm:2616 blocked for more than 120 seconds. Feb 6 10:32:39 box kernel: [222472.636727] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Feb 6 10:32:39 box kernel: [222472.636729] kvm D ffffffff81806200 0 2616 1 0x00000000 Feb 6 10:32:39 box kernel: [222472.636732] ffff8803f95b9cc8 0000000000000082 0000000000000000 ffffffffffffffe0 Feb 6 10:32:39 box kernel: [222472.636734] ffff8803f95b9fd8 ffff8803f95b9fd8 ffff8803f95b9fd8 0000000000013780 Feb 6 10:32:39 box kernel: [222472.636736] ffff880405a79700 ffff8803da9c8000 ffff8803da9c8000 ffff880400a80380 Feb 6 10:32:39 box kernel: [222472.636738] Call Trace: Feb 6 10:32:39 box kernel: [222472.636745] [] schedule+0x3f/0x60 Feb 6 10:32:39 box kernel: [222472.636748] [] exit_mm+0x85/0x130 Feb 6 10:32:39 box kernel: [222472.636750] [] do_exit+0x16e/0x420 Feb 6 10:32:39 box kernel: [222472.636764] [] ? kvm_vcpu_block+0x9b/0xb0 [kvm] Feb 6 10:32:39 box kernel: [222472.636766] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636768] [] ? recalc_sigpending+0x1b/0x50 Feb 6 10:32:39 box kernel: [222472.636770] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636772] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636774] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636777] [] ? do_vfs_ioctl+0x8a/0x340 Feb 6 10:32:39 box kernel: [222472.636780] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636781] [] ? set_current_blocked+0x52/0x70 Feb 6 10:32:39 box kernel: [222472.636783] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636784] [] ? sys_ioctl+0x7b/0xa0 Feb 6 10:32:39 box kernel: [222472.636787] [] int_signal+0x12/0x17 Feb 6 10:32:39 box kernel: [222472.636788] INFO: task kvm:2617 blocked for more than 120 seconds. Feb 6 10:32:39 box kernel: [222472.636789] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Feb 6 10:32:39 box kernel: [222472.636790] kvm D ffffffff81806200 0 2617 1 0x00000000 Feb 6 10:32:39 box kernel: [222472.636792] ffff8803db8f3cc8 0000000000000082 0000000000000000 ffffffffffffffe0 Feb 6 10:32:39 box kernel: [222472.636794] ffff8803db8f3fd8 ffff8803db8f3fd8 ffff8803db8f3fd8 0000000000013780 Feb 6 10:32:39 box kernel: [222472.636796] ffff880405a59700 ffff8803da9cdc00 ffff8803da9cdc00 ffff880400a80380 Feb 6 10:32:39 box kernel: [222472.636798] Call Trace: Feb 6 10:32:39 box kernel: [222472.636800] [] schedule+0x3f/0x60 Feb 6 10:32:39 box kernel: [222472.636802] [] exit_mm+0x85/0x130 Feb 6 10:32:39 box kernel: [222472.636803] [] do_exit+0x16e/0x420 Feb 6 10:32:39 box kernel: [222472.636808] [] ? kvm_vcpu_block+0x9b/0xb0 [kvm] Feb 6 10:32:39 box kernel: [222472.636810] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636812] [] ? recalc_sigpending+0x1b/0x50 Feb 6 10:32:39 box kernel: [222472.636814] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636816] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636817] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636819] [] ? do_vfs_ioctl+0x8a/0x340 Feb 6 10:32:39 box kernel: [222472.636821] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636823] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636824] [] ? sys_ioctl+0x7b/0xa0 Feb 6 10:32:39 box kernel: [222472.636826] [] int_signal+0x12/0x17 Feb 6 10:32:39 box kernel: [222472.636827] INFO: task kvm:26515 blocked for more than 120 seconds. Feb 6 10:32:39 box kernel: [222472.636828] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Feb 6 10:32:39 box kernel: [222472.636829] kvm D ffffffff81806200 0 26515 1 0x00000000 Feb 6 10:32:39 box kernel: [222472.636831] ffff8800080bdcc8 0000000000000082 0000000000000000 ffffffffffffffe0 Feb 6 10:32:39 box kernel: [222472.636833] ffff8800080bdfd8 ffff8800080bdfd8 ffff8800080bdfd8 0000000000013780 Feb 6 10:32:39 box kernel: [222472.636834] ffffffff81c0d020 ffff8801fe9c4500 ffff8801fe9c4500 ffff880400a80380 Feb 6 10:32:39 box kernel: [222472.636836] Call Trace: Feb 6 10:32:39 box kernel: [222472.636838] [] schedule+0x3f/0x60 Feb 6 10:32:39 box kernel: [222472.636840] [] exit_mm+0x85/0x130 Feb 6 10:32:39 box kernel: [222472.636842] [] do_exit+0x16e/0x420 Feb 6 10:32:39 box kernel: [222472.636843] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636845] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636847] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636848] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636850] [] ? do_futex+0x7c/0x1b0 Feb 6 10:32:39 box kernel: [222472.636852] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636854] [] ? vfs_write+0x110/0x180 Feb 6 10:32:39 box kernel: [222472.636855] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636857] [] int_signal+0x12/0x17 Feb 6 10:32:39 box kernel: [222472.636858] INFO: task kvm:28672 blocked for more than 120 seconds. Feb 6 10:32:39 box kernel: [222472.636859] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Feb 6 10:32:39 box kernel: [222472.636860] kvm D ffffffff81806200 0 28672 1 0x00000000 Feb 6 10:32:39 box kernel: [222472.636861] ffff88001d059cc8 0000000000000082 ffff88001d059ca8 ffffffff8104c2f8 Feb 6 10:32:39 box kernel: [222472.636863] ffff88001d059fd8 ffff88001d059fd8 ffff88001d059fd8 0000000000013780 Feb 6 10:32:39 box kernel: [222472.636865] ffff880405a29700 ffff8804006a1700 0000000000000282 ffff880400a80380 Feb 6 10:32:39 box kernel: [222472.636867] Call Trace: Feb 6 10:32:39 box kernel: [222472.636870] [] ? __wake_up_common+0x58/0x90 Feb 6 10:32:39 box kernel: [222472.636872] [] schedule+0x3f/0x60 Feb 6 10:32:39 box kernel: [222472.636873] [] exit_mm+0x85/0x130 Feb 6 10:32:39 box kernel: [222472.636875] [] do_exit+0x16e/0x420 Feb 6 10:32:39 box kernel: [222472.636877] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636878] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636880] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636882] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636883] [] ? do_futex+0x7c/0x1b0 Feb 6 10:32:39 box kernel: [222472.636885] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636886] [] ? vfs_write+0x110/0x180 Feb 6 10:32:39 box kernel: [222472.636888] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636810] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636812] [] ? recalc_sigpending+0x1b/0x50 Feb 6 10:32:39 box kernel: [222472.636814] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636816] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636817] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636819] [] ? do_vfs_ioctl+0x8a/0x340 Feb 6 10:32:39 box kernel: [222472.636821] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636823] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636824] [] ? sys_ioctl+0x7b/0xa0 Feb 6 10:32:39 box kernel: [222472.636826] [] int_signal+0x12/0x17 Feb 6 10:32:39 box kernel: [222472.636827] INFO: task kvm:26515 blocked for more than 120 seconds. Feb 6 10:32:39 box kernel: [222472.636828] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Feb 6 10:32:39 box kernel: [222472.636829] kvm D ffffffff81806200 0 26515 1 0x00000000 Feb 6 10:32:39 box kernel: [222472.636831] ffff8800080bdcc8 0000000000000082 0000000000000000 ffffffffffffffe0 Feb 6 10:32:39 box kernel: [222472.636833] ffff8800080bdfd8 ffff8800080bdfd8 ffff8800080bdfd8 0000000000013780 Feb 6 10:32:39 box kernel: [222472.636834] ffffffff81c0d020 ffff8801fe9c4500 ffff8801fe9c4500 ffff880400a80380 Feb 6 10:32:39 box kernel: [222472.636836] Call Trace: Feb 6 10:32:39 box kernel: [222472.636838] [] schedule+0x3f/0x60 Feb 6 10:32:39 box kernel: [222472.636840] [] exit_mm+0x85/0x130 Feb 6 10:32:39 box kernel: [222472.636842] [] do_exit+0x16e/0x420 Feb 6 10:32:39 box kernel: [222472.636843] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636845] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636847] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636848] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636850] [] ? do_futex+0x7c/0x1b0 Feb 6 10:32:39 box kernel: [222472.636852] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636854] [] ? vfs_write+0x110/0x180 Feb 6 10:32:39 box kernel: [222472.636855] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636857] [] int_signal+0x12/0x17 Feb 6 10:32:39 box kernel: [222472.636858] INFO: task kvm:28672 blocked for more than 120 seconds. Feb 6 10:32:39 box kernel: [222472.636859] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Feb 6 10:32:39 box kernel: [222472.636860] kvm D ffffffff81806200 0 28672 1 0x00000000 Feb 6 10:32:39 box kernel: [222472.636861] ffff88001d059cc8 0000000000000082 ffff88001d059ca8 ffffffff8104c2f8 Feb 6 10:32:39 box kernel: [222472.636863] ffff88001d059fd8 ffff88001d059fd8 ffff88001d059fd8 0000000000013780 Feb 6 10:32:39 box kernel: [222472.636865] ffff880405a29700 ffff8804006a1700 0000000000000282 ffff880400a80380 Feb 6 10:32:39 box kernel: [222472.636867] Call Trace: Feb 6 10:32:39 box kernel: [222472.636870] [] ? __wake_up_common+0x58/0x90 Feb 6 10:32:39 box kernel: [222472.636872] [] schedule+0x3f/0x60 Feb 6 10:32:39 box kernel: [222472.636873] [] exit_mm+0x85/0x130 Feb 6 10:32:39 box kernel: [222472.636875] [] do_exit+0x16e/0x420 Feb 6 10:32:39 box kernel: [222472.636877] [] ? __dequeue_signal+0x6a/0xb0 Feb 6 10:32:39 box kernel: [222472.636878] [] do_group_exit+0x44/0xa0 Feb 6 10:32:39 box kernel: [222472.636880] [] get_signal_to_deliver+0x21c/0x420 Feb 6 10:32:39 box kernel: [222472.636882] [] do_signal+0x45/0x130 Feb 6 10:32:39 box kernel: [222472.636883] [] ? do_futex+0x7c/0x1b0 Feb 6 10:32:39 box kernel: [222472.636885] [] ? sys_futex+0x10a/0x1a0 Feb 6 10:32:39 box kernel: [222472.636886] [] ? vfs_write+0x110/0x180 Feb 6 10:32:39 box kernel: [222472.636888] [] do_notify_resume+0x65/0x80 Feb 6 10:32:39 box kernel: [222472.636889] [] int_signal+0x12/0x17