I got this trying to upgrade Firefox in my oneiric VMs on precise.
ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: qemu-kvm 1.0+noroms-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-12.20-generic 3.2.2
Uname: Linux 3.2.0-12-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Tue Jan 31 21:56:30 2012
ExecutablePath: /usr/bin/qemu-system-x86_64
ExecutableTimestamp: 1327348412
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
KvmCmdLine:
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
115 17522 1 0 258884 567872 0 Jan31 ? 00:04:36 /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name sec-natty-amd64 -uuid 5235c533-f314-8cfd-897f-8d9d074befd4 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/sec-natty-amd64.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/opt/vms/kvm/sec-natty-amd64/tmpJLgAVt.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=writeback -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=18,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:16:36:ee:e4:a4,bus=pci.0,addr=0x3 -usb -vnc 127.0.0.1:2 -vga vmware -device AC97,id=sound0,bus=pci.0,addr=0x6 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
115 17990 1 0 232271 545592 1 Jan31 ? 00:02:37 /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name sec-natty-i386 -uuid fb3679ec-a39e-4edf-b5a0-5cec30d201ba -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/sec-natty-i386.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/opt/vms/kvm/sec-natty-i386/tmpiy1VvU.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=writeback -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=18,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:16:36:4e:51:d2,bus=pci.0,addr=0x3 -usb -vnc 127.0.0.1:3 -vga vmware -device AC97,id=sound0,bus=pci.0,addr=0x6 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
MachineType: System76, Inc. Gazelle Professional
ProcCmdline: /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -name sec-oneiric-amd64 -uuid 3435fc6c-02f8-2319-27f9-20bbd804ae27 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/sec-oneiric-amd64.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -drive file=/opt/vms/kvm/sec-oneiric-amd64/disk0.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=writeback -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=18,id=hostnet0 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:16:3e:88:5d:a7,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:0 -vga vmware -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
ProcCwd: /
ProcEnviron: PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-12-generic root=UUID=198e494b-64d5-4269-97bc-b08c411b8b60 ro recovery
SegvAnalysis:
Segfault happened at: 0x7f68012c59ff: or %rbp,(%rsi,%rax,8)
PC (0x7f68012c59ff) ok
source "%rbp" ok
destination "(%rsi,%rax,8)" (0x20007f67d4678f68) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: qemu-kvm
StacktraceTop:
set_bit (addr=<optimized out>, nr=-4) at ./bitops.h:122
vnc_dpy_update (ds=<optimized out>, x=-64, y=<optimized out>, w=10, h=<optimized out>) at ui/vnc.c:427
dpy_update (s=0x7f6802b44780, h=28, w=12, y=160, x=-66) at /build/buildd/qemu-kvm-1.0+noroms/console.h:240
vmsvga_update_rect (h=28, w=12, y=160, x=-66, s=0x7f6802f42b70) at /build/buildd/qemu-kvm-1.0+noroms/hw/vmware_vga.c:325
vmsvga_update_rect_flush (s=0x7f6802f42b70) at /build/buildd/qemu-kvm-1.0+noroms/hw/vmware_vga.c:358
Title: qemu-system-x86_64 crashed with SIGSEGV
UpgradeStatus: Upgraded to precise on 2012-01-29 (2 days ago)
UserGroups:
dmi.bios.date: 03/21/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.asset.tag: Not Applicable
dmi.board.name: Gazelle Professional
dmi.board.vendor: System76, Inc.
dmi.board.version: gazp6
dmi.chassis.asset.tag: Not Applicable
dmi.chassis.type: 10
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: gazp6
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd03/21/2011:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp6:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp6:cvnSystem76,Inc.:ct10:cvrgazp6:
dmi.product.name: Gazelle Professional
dmi.product.version: gazp6
dmi.sys.vendor: System76, Inc.
Thanks for filing this bug. This is a duplicate of 918791, I'll mark it as such.
Note that a workaround is to not use the vmware vga driver, though for some people that is not an acceptable workaround.
I believe this mainly shows up when the unity bar auto-unhides. Perhaps you could avoid it by making the unity bar always visible.