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view modules/free @ 37246:5cfb3a67238d
regex: avoid glibc deadlock during configure
glibc has a known bug where certain corruptions of the heap can
cause malloc to default to printing a debug message that includes
a backtrace, but the act of getting the backtrace uses dlopen
which in turn calls into malloc, causing a recursive lock ending
in deadlock. Thus, when configure is probing for a known glibc
heap corruption bug, the overall configure would hang.
The solution suggested by glibc developers is to force malloc
to quit printing debug messages, which avoids recursive malloc.
* m4/regex.m4 (gl_REGEX): Avoid recursive malloc deadlock when
glibc bug 15078 in turn triggers bug 16159.
Reported by Michal Privoznik.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 03 Dec 2013 10:34:13 -0700 |
parents | 102530f09eb5 |
children |
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Description: Work around incompatibility on older systems where free (NULL) fails. Notice: This module is obsolete. Files: lib/free.c m4/free.m4 Depends-on: configure.ac: gl_FUNC_FREE if test $gl_cv_func_free = no; then AC_LIBOBJ([free]) gl_PREREQ_FREE fi Makefile.am: Include: <stdlib.h> License: GPL Maintainer: Paul Eggert