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Bug 455355 - malloc debugging is noisy, messes up uname output
Summary: malloc debugging is noisy, messes up uname output
Alias: None
Product: Fedora
Classification: Fedora
Component: glibc
Version: rawhide
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2008-07-15 00:41 UTC by Kevin Kofler
Modified: 2016-11-24 15:47 UTC (History)
6 users (show)

Fixed In Version: 2.8.90-9
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2008-07-20 08:58:10 UTC

Attachments (Terms of Use)

Description Kevin Kofler 2008-07-15 00:41:55 UTC
Description of problem:
When malloc debugging is enabled, which the latest initscripts-8.79-1.fc10 
does system-wide, glibc prints a message to stderr (or is it stdout?) for 
every single program starting up:

malloc: using debugging hooks

That breaks programs like uname, at least cmake gets confused by the uname 
output and prints:

System is unknown to cmake, create:
Platform/malloc: using debugging hooks
Linux to use this system, please send your config file to 
so it can be added to cmake

and errors, breaking KDE package builds. If debugging is to be enabled 
system-wide in Rawhide, it has to be silent unless/until an error occurs.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Try running a build with the latest glibc and initscripts.
Actual results:
build.log gets spammed with "malloc: using debugging hooks", cmake gets 
confused and errors.

Expected results:
Use of debugging hooks is silent.

Additional info:
See also

Comment 1 Ulrich Drepper 2008-07-20 08:58:10 UTC
Changed in 2.8.90-9.

Comment 2 Kirby Zhou 2009-10-08 15:26:39 UTC
The same problem is in RHEL-5

Comment 3 Goran P 2011-05-19 12:45:44 UTC
Debugging hooks is ON.
check: echo $MALLOC_CHECK_
It is probably in 1. To solve your problem, enter: export MALLOC_CHECK_=0

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