Re: linuxthreads 2.2.2 causes SEGV

[Dan Maas]

> Greetings all, I am homing in on the cause of this problem
> (segfault inside __pthread_alt_lock() at startup time with
> any program linked to libpthread.so).

I have now found the exact change to glibc that triggered this.
Long URL, watch the line break:

http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/elf/soinit.c.diff?r1=1.8&r
2=1.9&cvsroot=glibc&f=h

Ulrich Drepper added special support for initializing pthreads between glibc
2.0 and 2.1.94. But then he removed it for 2.2.2.

Ulrich, could you explain why this was done? As of 2.2.2, glibc+pthreads is
severely broken in certain configurations, since glibc's call to
__register_frame_info tries to lock a pthreads mutex before pthreads has
initialized the %gs register. Result: instant segfault on startup.

Regards,
Dan