PURPOSE of /tools/glibc/Regression/bz522528-pthread-join-hangs-if-a-thread-calls-setuid
Description: Test for bz522528 (pthread_join() hangs if a thread calls setuid())
Author: Petr Muller <pmuller@redhat.com>
Bug summary: pthread_join() hangs if a thread calls setuid()
Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=522528

Description:

Created an attachment (id=360523)
reproducer's source file

Description of problem:

When a program creates a thread which calls setuid() and terminates, the other
thread trying to wait for it hangs.


Version-Release number of selected component (if applicable):

RHEL5 (2.5-34), also RHEL4 and the newest upstream sources


How reproducible:

always


Steps to Reproduce:

1. Compile attached source file of reproducer:

$ gcc -o reproducer reproducer.c -lpthread

2. and run it:

$ ./reproducer

  
Actual results:

program hangs


Expected results:

program should end without hanging


Additional info:

This bug has appeared quite a long ago, you can find it in a sourceware BZ with existing patch at:

http://sources.redhat.com/bugzilla/show_bug.cgi?id=3270#c2

The patch solves the problem, but I have no idea why this hasn't been applied in the upstream already. I have attached a slightly modiffied version of the patch to be able to be applied and built on RHEL5 glibc sources and it works and solves the problem.

There is also existing BZ for RHEL4:

https://bugzilla.redhat.com/show_bug.cgi?id=248671
