threads/165173: clang buildworld breaks libthr

[Shane Ambler]

>Number:         165173
>Category:       threads
>Synopsis:       clang buildworld breaks libthr
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-threads
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 15 11:40:07 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Shane Ambler
>Release:        9.0-RELEASE
>Organization:
>Environment:
FreeBSD leader 9.0-RELEASE FreeBSD 9.0-RELEASE #1: Wed Feb 15 16:03:18 CST 2012     root@:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
With a world built with clang a bus error is produced within libthr on a call to sigprocmask(), the common backtrace appears to be -

#0  0x00000008019001d5 in sigprocmask () from /lib/libthr.so.3
#1  0x0000000801b5b2ac in longjmp () from /lib/libc.so.7

Testing has shown that a world built with clang has this issue and replacing /lib/libthr.so.3 with one from a gcc built world fixes the issue.

More details can be found at http://forums.freebsd.org/showthread.php?t=29782

>How-To-Repeat:
The easiest way I have found is to build lang/perl5.12 within a clang built world.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: