Re: Consistent kernel hang during heavy TCP connection handling load

[Jan Kara]

> 
> I would not normally quote an an entire message, but it contains data
> relevant to this problem.
> 
> The hang below occurs even outside of GDB, and also occurs after
> upgrading the kernel:
> 
> Linux bbox.memeplex.com 2.6.8-1.521 #1 Mon Aug 16 09:01:18 EDT 2004
> i686 i686 i386 GNU/Linux
> 
> 
> 
> Can anyone please give me a clue/pointer to tools/techniques that
> might help identify where in the kernel the hang occurs?  The system
> is so completely unresponsive when this occurs that I cannot provide
> any forensic data.
  How unresponsive exactly it is? Can you switch consoles and write? I
suppose ps(1) hangs... Is the disk working?

You can compile kernel with the magic Sysrq key (it is the option in the
kernel debugging section), run it and then press alt-sysrq-t and the
state of all processes will be printed. That might help...

> Does anyone's experience show that these types of hangs might occur
> purely as the result of use (or mis-use) of the pthreads library?  I'm
> looking for hints about what parts of my code to review.
> 
> There could easily be erroneous calls to pthread_detach(),
> pthread_join(), close(), and other system calls involved.
> 
> Thanks,
> Andrew Athan

								Honza
-- 
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
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