/bin/sh core dumps on FreeBSD 7.2

Michal michal at sharescope.co.uk
Thu Nov 12 10:46:25 UTC 2009

Ivan Voras wrote:
> Hans F. Nordhaug wrote:
>> Hi!
>> Suddenly /bin/sh started to crash all the time with core dumps. I'm
>> running FreeBSD 7.2-RELEASE-p4 (i386) and I have not updated anything
>> lately.  The /bin/sh binary seems to be untouched. It might be some
>> hardware trouble, but the machine seems to run OK now. (I had to
>> replace /bin/sh with a symlink to /rescue/sh.)
>> I would like to track down the problem, but running sh I only get
>> "Segmentation fault: 11 (core dumped)". I would be happy to run
>> gdb and give you a backtrace. Any clues?
>> Hans
>> PS! I tried to run "freebsd-update IDS" to see if any files are
>> broken, but it stops at
>> Inspecting system... sha256: ///boot/kernel/utopia.ko.symbols:
>> Input/output error
> All of this points to a hardware problem.

Last time I saw things like this it was either a hard drive on the way
out, or a PSU dying. Run some pre-OS tests (Ultimate boot cd or
something) to try and get some results outside of the OS

> I think the best thing you can try is to manually get a hash fingerprint
> of your sh and compare it with another, known good copy.
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