bin/42158: qemu: pthread + fork = hang

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>Number:         42158
>Category:       bin
>Synopsis:       qemu: pthread + fork = hang
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 06 18:15:00 +0000 2009
>Originator:     Antti Kantee
>Release:        5.99.19
>Organization:
>Environment:
>Description:
A program which executes fork() and is linked against libpthread
hangs in when run in qemu.  This does not happen on normal hardware.
It is unclear if this is a libpthread bug, kernel bug or qemu bug
(please reclassify if it becomes apparent).
>How-To-Repeat:
#include <unistd.h>

int
main()
{

        fork();
}

cc test.c -lpthread
./a.out
>Fix: