threads/121343: pthread_cond_wait hanging in libthr

[David Xu]

The following reply was made to PR threads/121343; it has been noted by GNATS.

From: David Xu <davidxu at FreeBSD.org>
To: josh.carroll at gmail.com
Cc: freebsd-gnats-submit at FreeBSD.org
Subject: Re: threads/121343: pthread_cond_wait hanging in libthr
Date: Wed, 05 Mar 2008 10:51:35 +0800

 Josh Carroll wrote:
 >>  Can you attach to the process and see all threads info and backtrace ?
 >>  for example:
 >>  gdb /usr/local/bin/ushare 13323
 >>
 >>  (gdb) info threads
 > 
 > I can get a backtrace but not the thread information:
 > 
 > (gdb) bt
 > #0  0x00000000409d08da in _umtx_op () from /lib/libc.so.7
 > #1  0x0000000040ba5c9a in pthread_cleanup_push () from /lib/libthr.so.3
 > #2  0x0000000040ba231b in pthread_mutex_getprioceiling () from /lib/libthr.so.3
 > #3  0x0000000040774324 in WorkerThread (arg=0x40770d20) at src/ThreadPool.c:440
 > #4  0x0000000040b9f459 in pthread_getprio () from /lib/libthr.so.3
 > #5  0x0000000000000000 in ?? ()
 > Error accessing memory address 0x7fffffbff000: Bad address.
 > (gdb) info threads
 > Cannot get thread info: invalid key
 > 
 > Is there something I'm doing wrong here?
 > 
 
 This should not happen, I am not sure if there is memory problem in the
 program.
 
 Regards,
 David Xu