Re: Can a user app hang a *IX system?
From: Chuck Dillon (spam_at_nimblegen.com)
Date: 01/27/05
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Date: Thu, 27 Jan 2005 09:12:09 -0600
JimW wrote:
> I have a situation where our program(s) completely hang the system.
> OS is MontaVista Embedded Linux on a xscale big-endian cpu.
> Our app starts and hangs, and also hangs the system, can't ctrl-brk the app;
> can't use console, can't telnet (not a rejected connection, just hangs
> during the connect). I can, however, ping the system (thanks for small
> favors).
>
> I tried using gdb to attach to the process, and gdb also hangs.
> Further, while building the app, if I had a large no. of objects, it would
> also hang during the link for the shared library - by breaking it up into
> multiple .so files, it succeeded.
>
> It's obviously a resource problem, but I thought most *IX systems would
> start grumbling about running out before just dying.
I suggest you ask the folks in comp.unix.admin for ideas on how to
diagnose what is going on. If the system is not properly configured
such a situation can occur. I'm not an admin but I have worked on
development systems configured such that /tmp was in the root file
system. A user program that generated a lot of data to /tmp, like a
compiler or linker for example, could fill the root file system which
would lock up the system.
I would think it's also possible that you have a hardware problem, like
some bad memory for example.
Then there was that development system with the non-terminated SCSI
bus. It worked for the most part but occasionally got really confused
IIRC.
-- ced
>
> I have a smaller app that tests the no. of threads, semaphores, and files
> and it behaves normally - running out with about 500 thrds and 127
> semaphores.
>
> This is a very large app and is obviously way too big for the system (64mb),
> but should it be able to hang totally. The apps is fairly stable and runs
> fine on AIX, Linux RH, HP, Solaris.
>
> Any insight before I start flooding it with printfs???
>
> Thanks much,
-- Chuck Dillon Senior Software Engineer NimbleGen Systems Inc.
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