[sr-dev] shm_regex deadlock

[Stefan Keller]

On Sun, 13 Jun 2010 02:31:52 +0200
Stefan Keller <stefan.keller at isaco.de> wrote:

> Hi,
> 
> I used the shm_regex functions from lib in one of my own modules and
> noticed that it is dead-locking (it hangs in FUTEX_WAIT).
> The code hangs in regexec() when trying to acquire the lock. This was
> a bit hard to find out as I couldn't reproduce it in a virtual
> machine with some test code I wrote. It turns out this only happens if
> the machine has more than one physical CPU core.
> Reproducable on x86_64 with two CPU cores, glibc 2.3.6 (from Debian
> Etch) and glibc 2.11.1 (from Ubuntu Jaunty).

Sorry, I meant to write Ubuntu Lucid (10.04).

> Attached is a patch which does its own locking and thus works around
> this problem.
> 
> Best regards,
> Stefan
> 


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