Red Hat Bugzilla – Bug 200552
kernel panic on cat /proc/net/ip_conntrack_expect
Last modified: 2007-11-30 17:07:26 EST
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Description of problem:
Unexpected kernel panic when I tried looking at contrack data using the command
Unfortunately I needed this system up immediately and did not write out the kerenl panic data although it
did seem to be related to accessessing this file in /proc.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
System is a Dell PE 2850 with a single 2.8GHz Xeon with HT enabled. and 1GB RAM
Its not solely related to accessing the proc file, as I'm able to read the file
here without reproducing the problem. Its most likely, given that this file is
protected by two rwlocks, that this is a race generated by trying to read the
file while receiving packets with the filter configured. Can you provide your
iptables configuration? Also, would you be able to reproduce the problem while
running a custom kernel with CONFIG_NETFILTER_DEBUG enabled?
Created attachment 133333 [details]
iptables lokkit config
contents of /etc/sysconfig/iptables on affected machine
Unfortunately I cannot reproduce this on the referenced machine as it is a production server.
Thank you for the iptables config. If you can in any way manage to reproduce
that oops, it would be helpful to me. I'm going to try to reproduce here, but
unless I can, there likely won't be much I can do for this bug.
Note to self: If upstreams fixes this, these are some candidates
I'm not sure if you are able, but if you have a test machine that you can
reproduce this on, could you please test against the RHEL5 beta release? That
would help me narrow down if the above patches apply to this bug you are seeing,
as I am still unable to reproduce.