I couldn't say for certain without more information, but it looks like you had an update to Mono, and it was trying to (JIT)recompile all of the assemblies it knows about (which would include all of the aspx pages).
.Net automatically recompiles all assemblies on an update, and Mono can sometimes do the same, especially if the update triggers it.
Since it needs a couple file handles for each assembly, it can very quickly eat a lot of file handles on Linux (Windows cheats by having special kernel support for .NET and doesn't have the same problems).
There are, IIRC some parameters in Mono to limit the number of simultaneous IL compilers, but these would probably not be safe on a FC4 install.
==Joseph++
fouldragon@aol.com wrote:
> So I come into work today, and the webserver we operate (we do web
> development for about two dozen clients) is unresponsive and "weird".
> SSH won't connect, then it will. Basic commands (ls!) bitch about too
> many open files. And Plesk can't even tell me how much memory is free
> all the time.
>
> Eventually, I'm able to get the machine rebooted, and all returns to
> normal. But before it went reset, I noticed a hell of a lot of
>
> /usr/lib/pkgconfig/../../bin/mono /usr/lib/pkgconfig
>
> in the 'ps ax' command. My conclusion: Something fork-bombed and ate
> up all the available open-file handles.
>
> Any thoughts as to what would cause that command line? Maybe it was
> truncated to fit the terminal, but what would try to call its way out
> of the pkgconfig directory? And how do I prevent it from recurring?
>
> Box is Fedora Core 4. The only .net stuff we have, to my knowledge, is
> a few .aspx pages we developed for testing, then decided it was better
> to use a windows development host for people who wanted to host their
> final sited on Windows.
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