I am having problems with kernel stack overflow's on UML guests. Below
is information surrounding the system causing the problems. I am
basically looking to see if anyone notices anything blatently obvious
about what's wrong here. I might also switch to just plain 2.6.11 to
avoid any other external variables.
I've been using 2.6.10-gentoo-r6 patched with the skas v8 patches from
baisorblade's site as the host kernel.
For the guest kernel I am using 2.4.27 (vanilla) patched with the
following patches, in order.
uml-patch-2.4.24-1base.patch.bz2
uml-2.4.27-bs1
Both from baisorblade's site. I've been running what I consider to be
one of the most strenuous tests on a UML system, gcc compiles through
gentoo portage.
I am using the following startup script to launch the UML
#!/bin/bash
SYSTEM_NAME=webapps
MEMORY_SIZE=512M
HW_ADDRESS=FE:FD:78:CD:AC:EF
tunctl -t uml-$SYSTEM_NAME
brctl addif umlbr uml-$SYSTEM_NAME
ifconfig uml-$SYSTEM_NAME up
/uml/bin/linux ubd0=rootfs.$SYSTEM_NAME ubd1=swapfs.$SYSTEM_NAME umid=
$SYSTEM_NAME con0=fd:0,fd:1 eth0=tuntap,uml-$SYSTEM_NAME,$HW_ADDRESS
mem=$MEMORY_SIZE
The relevant GCC options are presented below (I think I just found my
problem):
CFLAGS="-02 -mcpu=pentium4"
CHOST="i386-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j6"
GCC Version:
The MAKEOPTS were set to j6 because I was using distcc to help with
kernel compilation. I dont think a system with 512M (guest) of ram can
really handle 6 makefile branches in parallel. It must have started
hitting the swap when it did this.
Also, on my other systems I have been using mcpu=i686, this looks like
this was a holdover from an earlier test. The host is a xeon server,
but I dont think I should be reaching for this higher cpu target inside
the UML until I have more stability problems locked down.
Does the kernel stack order affect the size of the kernel stack? Can I
increase this to 3 to help with some of the problems i'm noticing?
The swapfile for this host is 512M in size, and I can confirm it is
being configured via top.
--
Jonathan S. Romero
IT Manager - Raydiance Inc.
2602 Challenger Tech Court Suite 240
Orlando FL, 32826
Tel: 407-515-3180
E-mail: [EMAIL PROTECTED]
Fax: 407-515-3014
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