[Bug 602539] [NEW] qemu-system-x86_64 segfaults if using -no-kvm with -m 4096 or greater

[Rich]

Public bug reported:

Binary package hint: qemu-kvm

Latest Ubuntu 10.04 amd64.

I have a FreeBSD guest I had running quite slowly with the kvm-intel
module loaded, so I shut down the guest, and passed the -no-kvm flag to
kvm.

Much to my surprise, I experienced an immediate segmentation fault:
$ qemu-system-x86_64 -no-kvm -vnc :0 -hda fbsd_dev -m 4096
pci_add_option_rom: failed to find romfile "pxe-rtl8139.bin"
Segmentation fault (core dumped)

In contrast:
$ qemu-system-x86_64 -no-kvm -vnc :0 -hda fbsd_dev -m 4095
pci_add_option_rom: failed to find romfile "pxe-rtl8139.bin"
[runs happily forever]

I'm presuming this is some mishandled behavior of qemu having a limit of
memory being < 4096m when not using VT bits or somesuch, but it was
quite disruptive, and it didn't occur to me to try varying the memory
amount for most of a day.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: qemu-kvm 0.12.3+noroms-0ubuntu9
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Jul  7 00:32:52 2010
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
KvmCmdLine: Error: command ['ps', '-C', 'kvm', '-F'] failed with exit code 1: UID        PID  PPID  C    SZ   RSS PSR STIME TTY          TIME CMD
MachineType: Dell Inc. Precision WorkStation T5500
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-22-generic root=/dev/mapper/root-slash ro quiet splash
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: qemu-kvm
dmi.bios.date: 04/12/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A05
dmi.board.name: 0CRH6C
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA05:bd04/12/2010:svnDellInc.:pnPrecisionWorkStationT5500:pvr:rvnDellInc.:rn0CRH6C:rvrA00:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T5500
dmi.sys.vendor: Dell Inc.

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug lucid

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qemu-system-x86_64 segfaults if using -no-kvm with -m 4096 or greater
https://bugs.launchpad.net/bugs/602539
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