Signal handling broken with -lpthread

["Akos Szalkai" <akos@is.s.u-tokyo.ac.jp>]

>Submitter-Id:	net
>Originator:	Akos Szalkai
>Organization:
 
>Confidential:	no
>Synopsis:	No sigaction-using program linked with libpthread works.
>Severity:	critical
>Priority:	high
>Category:	libc
>Class:		sw-bug
>Release:	libc-2.0.95
>Environment:
	
Host type: i586-pc-linux-gnu
System: Linux vader 2.1.119 #144 H Aug 31 00:01:53 JST 1998 i586 unknown
Architecture: i586

Addons: crypt linuxthreads
Build CFLAGS: -O2
Build CC: gcc
Compiler version: egcs-2.91.56 19980829 (egcs-1.1 pre-release)
Kernel headers: 2.1.119
Symbol versioning: yes
Build static: yes
Build shared: yes
Build pic-default: no
Build profile: no
Build omitfp: no
Build bounded: no
Build static-nss: no
Stdio: libio

>Description:
	It seems that any program using the sigaction function
	segfaults if it is linked with -lpthread.  The segmentation
	fault does not occur with glibc-2.0.94 or if -lpthread is not
	used.
>How-To-Repeat:
	Consider the following trivial program:
        -----cut here-----
	#include <signal.h>

	int
	main (void)
	{
		struct sigaction old_action;

		sigaction (SIGINT, 0, &old_action);

		return 0;
	}
	-----cut here-----

	Linking it with -lpthread, it causes a segfault when run.  The
	segfault does not occur if it is not linked with -lpthread.

>Fix: