RE: [uml-user] bind9 utils seg fault

[Anthony B. <br...@st...>]

-----Original Message-----
From: use...@li...
[mailto:use...@li...]On Behalf Of
Jonas Meurer
Sent: Friday, December 03, 2004 5:05 PM
To: use...@li...
Subject: Re: [uml-user] bind9 utils seg fault


On 02/12/2004 Tad Kollar wrote:
> I'm running a 2.4.27 host + host-skas3-2.4.25.patch and have tried guest
> kernels 2.6.8.1 (patched), vanilla 2.6.9, and 2.6.10-rc2-mm4. On each of
> these guests, everything works fine except for tools that come with
> bind9 (host, dig, nslookup, named, rndc, etc) from Debian sid. They all
> seg fault immediately... strace and ltrace indicate the problem
> happening at a slightly different point each time. Strace shows it's
> most often after a munmap(), and ltrace seems to point to libisc as the
> culprit. The same tools work fine on a real host. There's plenty of
> memory available, only about 20M used out of 128M available to each guest.

I've been experiencing erratic problems with bind 9.2.3 (bind-9.2.3-76) on
my SuSE 9.1 UML images. The host is running a stock SuSE 2.6.5 kernel
(2.6.5-7.111-smp) while the guest is running 2.6.7-1um. The software will
run for hours or even days between crashes. Unfortunately, I've never been
able to "witness" a crash. The only apparently linked event is a spike in
the CPU for 2-5 minutes prior to the crash.

Unfortunately, I have no idea if this is related to UML or SuSE.
Fortunately, I've minimized the impact through multiple servers and a script
that automates the restart of the daemon when it dies. I don't know if this
might help, but here is the list of linked libraries:

# ldd `which named`
        liblwres.so.1 => /usr/lib/liblwres.so.1 (0x4001c000)
        libdns.so.11 => /usr/lib/libdns.so.11 (0x4002c000)
        libcrypto.so.0.9.7 => /usr/lib/libcrypto.so.0.9.7 (0x4012d000)
        libisccfg.so.0 => /usr/lib/libisccfg.so.0 (0x4021d000)
        libisccc.so.0 => /usr/lib/libisccc.so.0 (0x4022d000)
        libisc.so.7 => /usr/lib/libisc.so.7 (0x40235000)
        libnsl.so.1 => /lib/libnsl.so.1 (0x4026e000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x40284000)
        libc.so.6 => /lib/libc.so.6 (0x402d7000)
        libdl.so.2 => /lib/libdl.so.2 (0x403ec000)
        /lib/ld-linux.so.2 => /lib/ld-linux.so.2 (0x40000000)
#

Tony