[sr-dev] shm_regex deadlock

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). Attached is a patch which does its own locking and thus works around this problem. Best regards, Stefan -- M.Eng. Stefan Keller CTO (Technischer Leiter) Phone +49-30-203899889 Mobile +49-170-4150437 Fax +49-30-722399150 stefan.keller(a)isaco.de www.isaco.de ISACO GmbH Kurfürstenstr. 79 10787 Berlin Germany Amtsgericht Charlottenburg, HRB 112464B Geschäftsführer: Daniel Frommherz