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view modules/ffsll @ 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 | 01f0c650a797 |
children |
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Description: Finds the index of the least-significant set bit. Files: lib/ffsl.h lib/ffsll.c m4/ffsll.m4 Depends-on: extensions string ffs [test $HAVE_FFSLL = 0] configure.ac: gl_FUNC_FFSLL if test $HAVE_FFSLL = 0; then AC_LIBOBJ([ffsll]) fi gl_STRING_MODULE_INDICATOR([ffsll]) Makefile.am: Include: <string.h> License: LGPLv2+ Maintainer: Eric Blake