Re: FreeBSD 8.0 - network stack crashes?

If memory serves me right, sometime around Tomorrow, Ivan Voras told me:

Weldon S Godfrey 3 wrote:

I don't know how to troubleshoot this further on the server since I am not getting any problems indicated in logging, panics, cores, etc.

If you have console access to the system, the generic advice would be to compile a kernel with the kernel debugger - options KDB and DDB (see http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-online-ddb.html), enter the debugger, force a kernel dump file to be created (by entering "call doadump") and then proceed with post-mortem examination of the kernel at your leisure (e.g. from a remote ssh console, etc).

See http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-deadlocks.html for instructions on what information to collect.

If you can provoke your problem with using WITNESS that would probably be great, but it will slow down your production machine noticeably. When WITNESS is enabled you might also get more information - such as LOR warnings, which you should also collect.

Keep the dump file, someone might ask you for more information.


Thanks, I will work on trying to get a system with those enabled.

Another thought that came to mind that this sounds like some sort of network buffer exhaustion. Is there anything to look for there?
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Relevant Pages

  • Re: FreeBSD 8.0 - network stack crashes?
    ... If you have console access to the system, the generic advice would be to compile a kernel with the kernel debugger - options KDB and DDB, enter the debugger, force a kernel dump file to be created and then proceed with post-mortem examination of the kernel at your leisure. ... If you can provoke your problem with using WITNESS that would probably be great, but it will slow down your production machine noticeably. ... Keep the dump file, someone might ask you for more information. ...
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