10-08-2015
Actually -- your kernel is old enough that it's using
LinuxThreads instead of modern NPTL. LinuxThreads had an irreparable design flaw which led to its abandonment and replacement by NPTL. Under some circumstances, control signals between processes overflow and are simply lost, causing hanging/stuck processes strikingly similar to this. I had the same problem, way way back in the day. Ancient history now, unless you're using a 15 year old kernel.
You need to upgrade your kernel.
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LEARN ABOUT CENTOS
pthread_kill_other_threads_np
PTHREAD_KILL_OTHER_THREADS_NP(3) Linux Programmer's Manual PTHREAD_KILL_OTHER_THREADS_NP(3)
NAME
pthread_kill_other_threads_np - terminate all other threads in process
SYNOPSIS
#include <pthread.h>
void pthread_kill_other_threads_np(void);
DESCRIPTION
pthread_kill_other_threads_np() has an effect only in the LinuxThreads threading implementation. On that implementation, calling this
function causes the immediate termination of all threads in the application, except the calling thread. The cancellation state and cancel-
lation type of the to-be-terminated threads are ignored, and the cleanup handlers are not called in those threads.
CONFORMING TO
This function is a nonstandard GNU extension; hence the suffix "_np" (nonportable) in the name.
NOTES
pthread_kill_other_threads_np() is intended to be called just before a thread calls execve(2) or a similar function. This function is
designed to address a limitation in the obsolete LinuxThreads implementation whereby the other threads of an application are not automati-
cally terminated (as POSIX.1-2001 requires) during execve(2).
In the NPTL threading implementation, pthread_kill_other_threads_np() exists, but does nothing. (Nothing needs to be done, because the
implementation does the right thing during an execve(2).)
SEE ALSO
execve(2), pthread_cancel(3), pthread_setcancelstate(3), pthread_setcanceltype(3), pthreads(7)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2010-09-09 PTHREAD_KILL_OTHER_THREADS_NP(3)