Public bug reported:
Clients:
various, with Ubuntu 10.04.1 LTS i386 (desktop), or 10.04.2 LTS i386
(installed as terminal-client)
Last tested Ethernet Controller: nVidia Corporation MCP61 Ethernet (forcedeth
driver)
Server:
DistroRelease: Ubuntu 10.04
InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release amd64
(20100427)
Package: nbd-server 1:2.9.14-2ubuntu1
PackageArchitecture: amd64
ProblemType: Bug
ProcEnviron:
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-30.59-server 2.6.32.29+drm33.13
SourcePackage: nbd
Tags: lucid
Uname: Linux 2.6.32-30-server x86_64
Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express
Gigabit Ethernet controller
(driver r8169 driver)
Steps to reproduce:
on server:
mkdir /var/tmp/cargo
dd if=/dev/urandom of=/var/tmp/cargo/1 bs=1048576 count=128
dd if=/dev/urandom of=/var/tmp/cargo/2 bs=1048576 count=128
dd if=/dev/urandom of=/var/tmp/cargo/3 bs=1048576 count=128
dd if=/dev/urandom of=/var/tmp/cargo/4 bs=1048576 count=128
mksquashfs /var/tmp/cargo /var/tmp/cargo.img -noI -noD -noF -b 4096 # image
size is 513Mb, comparable with LTSP image
nbd-server 2000 /var/tmp/cargo.img -C /dev/null -r
on client:
nbd-client ${SERVER_IP} 2000 /dev/nbd0 # tried with options bs=4096 and bs=1024
mount -o ro -t squashfs /dev/nbd0 /var/tmp/nbdtmp
while true; do cat /var/tmp/nbdtmp/* > /dev/null; done # any access will trigger
expected:
succesfull mounted volume on client;
in reproducing scenario: high load of cpu making stupid things in endless, but
interruptable process
in ltsp booting: ltsp_nbd boot scenario to continue after mounting root device
observed:
mounted with "nbd0: unknown partition table in kernel.log"
random kernel segfaults, Oops, panic, and some_random_application Tainted: P
stack trace is different each time, at time of reporting bug it failed to get
logged.
attaching kernel log as an example
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: nbd-client 1:2.9.14-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-27.49-generic 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Tue Apr 12 18:13:48 2011
ProcEnviron:
LANGUAGE=
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: nbd
** Affects: nbd (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 lucid
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/758689
Title:
access to nbd-mounted volume causes kernel panic, oops, shock and
death
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