* [Bug libc/13594] Crash if nscd is not running in __nscd_get_mapping
2012-01-13 16:39 [Bug libc/13594] New: Crash if nscd is not running in __nscd_get_mapping aj at suse dot de
@ 2012-01-13 21:13 ` idoenmez at suse dot de
2012-01-21 23:13 ` allan at archlinux dot org
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From: idoenmez at suse dot de @ 2012-01-13 21:13 UTC (permalink / raw)
To: glibc-bugs
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idoenmez at suse dot de changed:
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2012-01-13 21:13 ` [Bug libc/13594] " idoenmez at suse dot de
@ 2012-01-21 23:13 ` allan at archlinux dot org
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From: allan at archlinux dot org @ 2012-01-21 23:13 UTC (permalink / raw)
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Allan McRae <allan at archlinux dot org> changed:
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2012-01-13 21:13 ` [Bug libc/13594] " idoenmez at suse dot de
2012-01-21 23:13 ` allan at archlinux dot org
@ 2012-01-22 23:34 ` turn3r.tr3v0r at gmail dot com
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Trevor Turner <turn3r.tr3v0r at gmail dot com> changed:
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| |com
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From: ajaxas at gmail dot com @ 2012-02-07 16:45 UTC (permalink / raw)
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Vladimir Shorikov <ajaxas at gmail dot com> changed:
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CC| |ajaxas at gmail dot com
--- Comment #1 from Vladimir Shorikov <ajaxas at gmail dot com> 2012-02-07 16:44:47 UTC ---
I confirm this for Chromium on archlinux.
Specs (just in case):
- kernel 3.3-rc2 (vanilla)
- glibc 2.15
I can only add 2 things:
- this happens only once in a session, i.e. when Chromium is launched for the
first time after boot; after that Chromium starts normally.
- I couldn't yet reproduce this bug *within* gdb - it always starts without a
problem. I will continue trying though.
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From: pcpa at mandriva dot com.br @ 2012-02-11 22:53 UTC (permalink / raw)
To: glibc-bugs
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Paulo César Pereira de Andrade <pcpa at mandriva dot com.br> changed:
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CC| |pcpa at mandriva dot com.br
--- Comment #2 from Paulo César Pereira de Andrade <pcpa at mandriva dot com.br> 2012-02-11 22:52:36 UTC ---
I am just starting testing an update from "2.14.90" to "2.15" for
mandriva, and I get this randomly, varying from 1 to 4 times every
restart of chromium-browser.
$ rpm -qf /usr/bin/chromium-browser
chromium-browser-unstable-17.0.963.26-1-mdv2012.0.x86_64
$ LD_LIBRARY_PATH=/usr/lib64/chromium-browser gdb
/usr/lib64/chromium-browser/chrome
...
0x00007ffff18f5e7e in __nscd_get_mapping (type=<optimized out>, key=
0x7ffff19436b4 "hosts", mappedp=0x7ffff1b82548) at nscd_helper.c:417
417 if (oldval != NULL && atomic_decrement_val (&oldval->counter) == 0)
(gdb) p oldval
$1 = (struct mapped_database *) 0xffffffffffffffff
(gdb) bt
#0 0x00007ffff18f5e7e in __nscd_get_mapping (type=<optimized out>, key=
0x7ffff19436b4 "hosts", mappedp=0x7ffff1b82548) at nscd_helper.c:417
#1 0x00007ffff18f4098 in __nscd_get_nl_timestamp () at nscd_gethst_r.c:113
#2 0x00007ffff18e2be8 in __check_pf (seen_ipv4=0x7ffff7ed071e, seen_ipv6=
0x7ffff7ed071f, in6ai=0x7ffff7ed06e0, in6ailen=0x7ffff7ed06f0)
at ../sysdeps/unix/sysv/linux/check_pf.c:324
#3 0x00007ffff18aa015 in __GI_getaddrinfo (name=
0x555559ba3a68 "www.statcounter.com", service=<optimized out>, hints=
0x7ffff7ed0a60, pai=0x7ffff7ed0a98) at ../sysdeps/posix/getaddrinfo.c:2305
#4 0x00005555566a0c9c in ?? ()
#5 0x000055555669b3e8 in ?? ()
#6 0x0000555557d85b95 in ?? ()
#7 0x0000555556437fb2 in ?? ()
#8 0x00007ffff4239bd0 in start_thread (arg=0x7ffff7ed1700)
at pthread_create.c:309
#9 0x00007ffff18bd93d in clone ()
at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115
I believe this should correct it, but not the proper solution:
--- glibc-2.15-a316c1f/nscd/nscd_helper.c.orig 2012-02-11 20:25:37.804514879
-0200
+++ glibc-2.15-a316c1f/nscd/nscd_helper.c 2012-02-11 20:26:07.428588082
-0200
@@ -414,7 +414,8 @@ __nscd_get_mapping (request_type type, c
struct mapped_database *oldval = *mappedp;
*mappedp = result;
- if (oldval != NULL && atomic_decrement_val (&oldval->counter) == 0)
+ if (oldval != NULL && oldval != NO_MAPPING
+ && atomic_decrement_val (&oldval->counter) == 0)
__nscd_unmap (oldval);
return result;
hopefully also useful:
(gdb) frame 0#0 0x00007ffff18f5e7e in __nscd_get_mapping (type=<optimized
out>, key=
0x7ffff19436b4 "hosts", mappedp=0x7ffff1b82548) at nscd_helper.c:417
417 if (oldval != NULL && atomic_decrement_val (&oldval->counter) == 0)
(gdb) p keylen
$12 = 6
(gdb) p mapsize
$13 = 0
(gdb) p iov
$14 = {{iov_base = 0x7ffff7ed0330, iov_len = 6}, {iov_base = 0x7ffff7ed04a0,
iov_len = 8}}
(gdb) p cmsg
$15 = <optimized out>
(gdb) p (cmsg)->__cmsg_data
value has been optimized out
(gdb) p ip
$16 = <optimized out>
(gdb) p mapfd
$17 = <optimized out>
(gdb) p st
No symbol "st" in current context.
(gdb) p mapping
$18 = <optimized out>
(gdb) p size
No symbol "size" in current context.
(gdb) p oldval
$19 = (struct mapped_database *) 0xffffffffffffffff
(gdb) p result
$20 = (struct mapped_database *) 0xffffffffffffffff
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` (5 preceding siblings ...)
2012-02-11 22:53 ` pcpa at mandriva dot com.br
@ 2012-02-11 23:02 ` pcpa at mandriva dot com.br
2012-02-12 4:26 ` ajaxas at gmail dot com
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From: pcpa at mandriva dot com.br @ 2012-02-11 23:02 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #3 from Paulo César Pereira de Andrade <pcpa at mandriva dot com.br> 2012-02-11 23:01:24 UTC ---
Forgot to add some extra information:
$ ls /usr/lib64/chromium-browser
chrome* libppGoogleNaClPluginChrome.so* resources.pak
chrome.pak locales/ themes/
chrome-sandbox* nacl_helper* xdg-mime*
chromium-wrapper* nacl_helper_bootstrap* xdg-settings*
default_apps/ nacl_irt_x86_64.nexe
libffmpegsumo.so* resources/
If removing libppGoogleNaClPluginChrome.so from that directory,
or overriding the wrapper and starting chrome without setting
LD_LIBRARY_PATH I could not get it to crash, neither did notice
any problems.
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` (6 preceding siblings ...)
2012-02-11 23:02 ` pcpa at mandriva dot com.br
@ 2012-02-12 4:26 ` ajaxas at gmail dot com
2012-02-12 4:35 ` allan at archlinux dot org
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From: ajaxas at gmail dot com @ 2012-02-12 4:26 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #4 from Vladimir Shorikov <ajaxas at gmail dot com> 2012-02-12 04:25:56 UTC ---
It's already fixed in archlinux, though it was one helluva big commit:
http://projects.archlinux.org/svntogit/packages.git/commit/trunk?h=packages/glibc&id=8e950112da65c96ad17cbd650ac9db3050343a3f
I'm not even sure where to look...
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2012-02-12 4:26 ` ajaxas at gmail dot com
@ 2012-02-12 4:35 ` allan at archlinux dot org
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From: allan at archlinux dot org @ 2012-02-12 4:35 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #5 from Allan McRae <allan at archlinux dot org> 2012-02-12 04:33:38 UTC ---
That is called reverting the commit that caused the issue... Not fixing it.
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` (8 preceding siblings ...)
2012-02-12 4:35 ` allan at archlinux dot org
@ 2012-02-12 4:40 ` ajaxas at gmail dot com
2012-02-21 2:32 ` [Bug nscd/13594] " jsm28 at gcc dot gnu.org
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From: ajaxas at gmail dot com @ 2012-02-12 4:40 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #6 from Vladimir Shorikov <ajaxas at gmail dot com> 2012-02-12 04:39:26 UTC ---
(In reply to comment #5)
> That is called reverting the commit that caused the issue... Not fixing it.
Okay.
It's already reverted in archlinux. Hope this stays reverted for good and finds
it's way into the upstream (if this wasn't archlinux-only problem since it was
*package* version that changed...)
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2012-03-27 18:48 ` law at redhat dot com
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From: jsm28 at gcc dot gnu.org @ 2012-02-21 2:32 UTC (permalink / raw)
To: glibc-bugs
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Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |drepper.fsp at gmail dot
| |com
Component|libc |nscd
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2012-02-21 2:32 ` [Bug nscd/13594] " jsm28 at gcc dot gnu.org
@ 2012-03-27 18:48 ` law at redhat dot com
2012-03-27 19:09 ` pcpa at mandriva dot com.br
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From: law at redhat dot com @ 2012-03-27 18:48 UTC (permalink / raw)
To: glibc-bugs
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law at redhat dot com changed:
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CC| |law at redhat dot com
--- Comment #7 from law at redhat dot com 2012-03-27 18:19:34 UTC ---
Based on just reading the code, I wonder if a one thread is mucking up
hst_map_handle.mapped behind the back of nscd_get_mapping.
nscd_get_nl_timestamp doesn't bother to grab the hst_map_handle lock and calls
into nscd_get_mapping which could potentially change hst_map_handle.mapped to
NO_MAPPING.
If this occurs after another thread had passed the NO_MAPPING check in
nscd_get_map_ref, but hasn't yet hit the atomic_decrement_val in
nscd_get_mapping then it could cause the failure mode reported in this report
(and several others across various distros, upstream kde and possibly
elsewhere).
That would also explain why the patch in c#2 works as well as the lack of
reproducability.
Vladimir/Paulo: I don't have a way to reproduce the problem here, but I could
pass along a patch to y'all if you're interested in testing my theory.
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` (11 preceding siblings ...)
2012-03-27 18:48 ` law at redhat dot com
@ 2012-03-27 19:09 ` pcpa at mandriva dot com.br
2012-03-28 9:35 ` aj at suse dot de
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From: pcpa at mandriva dot com.br @ 2012-03-27 19:09 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #8 from Paulo César Pereira de Andrade <pcpa at mandriva dot com.br> 2012-03-27 18:46:35 UTC ---
(In reply to comment #7)
[...]
> Vladimir/Paulo: I don't have a way to reproduce the problem here, but I could
> pass along a patch to y'all if you're interested in testing my theory.
I can test it tonight at home, that is the only place I managed to
reproduce the problem. I almost sure it should be some race condition
as when running chromium under gdb it would always have a lot of
threads running, and when playing with the libraries and LD_LIBRARY_PATH
I should have just changed some timing.
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` (12 preceding siblings ...)
2012-03-27 19:09 ` pcpa at mandriva dot com.br
@ 2012-03-28 9:35 ` aj at suse dot de
2012-03-28 19:13 ` law at redhat dot com
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From: aj at suse dot de @ 2012-03-28 9:35 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #9 from Andreas Jaeger <aj at suse dot de> 2012-03-28 08:15:31 UTC ---
Jeff, please add the patch here and we all can test it. Thanks for looking into
this!
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@ 2012-03-28 19:13 ` law at redhat dot com
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From: law at redhat dot com @ 2012-03-28 19:13 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #10 from law at redhat dot com 2012-03-28 16:51:17 UTC ---
Created attachment 6307
--> http://sourceware.org/bugzilla/attachment.cgi?id=6307
Potential fix
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` (14 preceding siblings ...)
2012-03-28 19:13 ` law at redhat dot com
@ 2012-03-29 17:25 ` law at redhat dot com
2012-04-16 15:06 ` adconrad at 0c3 dot net
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From: law at redhat dot com @ 2012-03-29 17:25 UTC (permalink / raw)
To: glibc-bugs
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--- Comment #11 from law at redhat dot com 2012-03-29 16:21:29 UTC ---
Just a note from a tester within Red Hat. He was reporting a ktorrent crashes
when starting up which appeared to be related to, or possibly this same
problem.
After installing the patch already attached to this BZ, the ktorrent crashes
have ceased.
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` (15 preceding siblings ...)
2012-03-29 17:25 ` law at redhat dot com
@ 2012-04-16 15:06 ` adconrad at 0c3 dot net
2012-05-07 20:30 ` carlos_odonell at mentor dot com
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From: adconrad at 0c3 dot net @ 2012-04-16 15:06 UTC (permalink / raw)
To: glibc-bugs
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Adam Conrad <adconrad at 0c3 dot net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |adconrad at 0c3 dot net
--- Comment #12 from Adam Conrad <adconrad at 0c3 dot net> 2012-04-16 15:04:53 UTC ---
I've gotten confirmation from a few Ubuntu users that Jeff's fix is working for
them, FWIW.
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` (16 preceding siblings ...)
2012-04-16 15:06 ` adconrad at 0c3 dot net
@ 2012-05-07 20:30 ` carlos_odonell at mentor dot com
2012-05-15 18:39 ` aj at suse dot de
` (4 subsequent siblings)
22 siblings, 0 replies; 24+ messages in thread
From: carlos_odonell at mentor dot com @ 2012-05-07 20:30 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13594
Carlos O'Donell <carlos_odonell at mentor dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |carlos_odonell at mentor
| |dot com
Target Milestone|--- |2.16
--- Comment #13 from Carlos O'Donell <carlos_odonell at mentor dot com> 2012-05-07 20:27:09 UTC ---
We want this fix in 2.16, setting milestone.
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^ permalink raw reply [flat|nested] 24+ messages in thread* [Bug nscd/13594] Crash if nscd is not running in __nscd_get_mapping
2012-01-13 16:39 [Bug libc/13594] New: Crash if nscd is not running in __nscd_get_mapping aj at suse dot de
` (17 preceding siblings ...)
2012-05-07 20:30 ` carlos_odonell at mentor dot com
@ 2012-05-15 18:39 ` aj at suse dot de
2012-05-16 4:24 ` law at redhat dot com
` (3 subsequent siblings)
22 siblings, 0 replies; 24+ messages in thread
From: aj at suse dot de @ 2012-05-15 18:39 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13594
Andreas Jaeger <aj at suse dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
AssignedTo|drepper.fsp at gmail dot |aj at suse dot de
|com |
--- Comment #14 from Andreas Jaeger <aj at suse dot de> 2012-05-15 18:37:56 UTC ---
this is fixed now with:
commit 509072a0f7f8a37bedf61a78c0cdd7783368c65a
Author: Andreas Jaeger <aj@suse.de>
Date: Tue May 15 20:35:53 2012 +0200
Avoid race in nscd
2012-05-15 Jeff Law <law@redhat.com>
Andreas Jaeger <aj@suse.de>
[BZ #13594]
* nscd/nscd-client.h (__nscd_acquire_maplock): New function, split
out from...
* nscd/nscd_helper.c (__nscd_get_map_ref): ... here.
* nscd/nscd-client.h: Add __nscd_acquire_maplock.
* nscd/nscd_gethst_r.c (__nscd_get_nl_timestamp): Add locking to
code changing __hst_map_handle.map.
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^ permalink raw reply [flat|nested] 24+ messages in thread* [Bug nscd/13594] Crash if nscd is not running in __nscd_get_mapping
2012-01-13 16:39 [Bug libc/13594] New: Crash if nscd is not running in __nscd_get_mapping aj at suse dot de
` (18 preceding siblings ...)
2012-05-15 18:39 ` aj at suse dot de
@ 2012-05-16 4:24 ` law at redhat dot com
2014-02-16 19:42 ` jackie.rosen at hushmail dot com
` (2 subsequent siblings)
22 siblings, 0 replies; 24+ messages in thread
From: law at redhat dot com @ 2012-05-16 4:24 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=13594
--- Comment #15 from law at redhat dot com 2012-05-16 04:23:10 UTC ---
Thanks for taking care of this Andreas. I've just updated Fedora Rawhide to
use your version of this fix.
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^ permalink raw reply [flat|nested] 24+ messages in thread* [Bug nscd/13594] Crash if nscd is not running in __nscd_get_mapping
2012-01-13 16:39 [Bug libc/13594] New: Crash if nscd is not running in __nscd_get_mapping aj at suse dot de
` (19 preceding siblings ...)
2012-05-16 4:24 ` law at redhat dot com
@ 2014-02-16 19:42 ` jackie.rosen at hushmail dot com
2014-05-28 19:45 ` schwab at sourceware dot org
2014-06-27 11:12 ` fweimer at redhat dot com
22 siblings, 0 replies; 24+ messages in thread
From: jackie.rosen at hushmail dot com @ 2014-02-16 19:42 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=13594
Jackie Rosen <jackie.rosen at hushmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jackie.rosen at hushmail dot com
--- Comment #16 from Jackie Rosen <jackie.rosen at hushmail dot com> ---
*** Bug 260998 has been marked as a duplicate of this bug. ***
Seen from the domain http://volichat.com
Page where seen: http://volichat.com/adult-chat-rooms
Marked for reference. Resolved as fixed @bugzilla.
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^ permalink raw reply [flat|nested] 24+ messages in thread* [Bug nscd/13594] Crash if nscd is not running in __nscd_get_mapping
2012-01-13 16:39 [Bug libc/13594] New: Crash if nscd is not running in __nscd_get_mapping aj at suse dot de
` (20 preceding siblings ...)
2014-02-16 19:42 ` jackie.rosen at hushmail dot com
@ 2014-05-28 19:45 ` schwab at sourceware dot org
2014-06-27 11:12 ` fweimer at redhat dot com
22 siblings, 0 replies; 24+ messages in thread
From: schwab at sourceware dot org @ 2014-05-28 19:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=13594
Andreas Schwab <schwab at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|jackie.rosen at hushmail dot com |
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^ permalink raw reply [flat|nested] 24+ messages in thread* [Bug nscd/13594] Crash if nscd is not running in __nscd_get_mapping
2012-01-13 16:39 [Bug libc/13594] New: Crash if nscd is not running in __nscd_get_mapping aj at suse dot de
` (21 preceding siblings ...)
2014-05-28 19:45 ` schwab at sourceware dot org
@ 2014-06-27 11:12 ` fweimer at redhat dot com
22 siblings, 0 replies; 24+ messages in thread
From: fweimer at redhat dot com @ 2014-06-27 11:12 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=13594
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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