Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.

Bug 1055613

Summary: glibc scanf bug, breaks ATLAS build
Product: [Fedora] Fedora Reporter: Volker Braun <vbraun.name>
Component: glibcAssignee: Siddhesh Poyarekar <spoyarek>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 20CC: codonell, fweimer, jakub, law, mnewsome, pfrankli, spoyarek
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: glibc-2.18-12.fc20 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2014-02-01 04:03:26 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description Volker Braun 2014-01-20 15:50:03 UTC
Description of problem:

Glibc fails to parse 0 in scientific notation. This breaks the ATLAS build system, failing with a segfault in RunMADef (atlas-3.8.4) or an assertion failure in RunMulAdd (atlas-3.10.1).


Version-Release number of selected component (if applicable): 
* Fedora 20
* glibc-devel-2.18-11.fc20

How reproducible:

Always.


Steps to Reproduce:

$ cat test.c 
#include <stdio.h>
int main() {
    float a, b;
    int r = sscanf("0e+0 42", "%f %f", &a, &b);
    printf("r=%d a=%f b=%f\n", r, a, b);
    return 0;
}


Actual results:

$ gcc test.c && ./a.out
r=1 a=0.000000 b=0.000000


Expected results:

r=2 a=0.000000 b=42.000000


Additional info:
* https://sourceware.org/bugzilla/show_bug.cgi?id=15917

Comment 1 Carlos O'Donell 2014-01-20 16:30:38 UTC
Volker,

Thanks. Sorry about this. We'll get this fixed ASAP.

Siddhesh,

Would you mind looking at the backport?

Comment 2 Fedora Update System 2014-01-30 10:14:50 UTC
glibc-2.18-12.fc20 has been submitted as an update for Fedora 20.
https://admin.fedoraproject.org/updates/glibc-2.18-12.fc20

Comment 3 Fedora Update System 2014-01-31 04:26:12 UTC
Package glibc-2.18-12.fc20:
* should fix your issue,
* was pushed to the Fedora 20 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing glibc-2.18-12.fc20'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2014-1830/glibc-2.18-12.fc20
then log in and leave karma (feedback).

Comment 4 Fedora Update System 2014-02-01 04:03:26 UTC
glibc-2.18-12.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.