Debian Bug report logs - #423222
SIGBUS in _nss_mdns4_gethostbyaddr_r on SPARC

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Dan Smolik <marvin@sitour.cz>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: SIGBUS in _nss_mdns4_gethostbyaddr_r on SPARC

Date: Thu, 10 May 2007 19:27:41 +0200

Package: libnss-mdns
Version: 0.9-0.2
Severity: critical
Tags: security

I have two SPARC machines after  latest upgrade apt install avahi-package and
modify /etc/nsswitch.conf to use avahi. But now if I ping from one machine
to second ping crasehd with SIGBUS. If I ping from second to first ping not
crashed. Both machines runnig SID and are synced with repository.
There is back trace of this:
Core was generated by `ping e450'.
Program terminated with signal 10, Bus error.
#0  0xf7ef8b94 in _nss_mdns4_gethostbyaddr_r () from /lib/libnss_mdns4.so.2
(gdb) bt
#0  0xf7ef8b94 in _nss_mdns4_gethostbyaddr_r () from /lib/libnss_mdns4.so.2
#1  0xf7e682c4 in gethostbyaddr_r@@GLIBC_2.1.2 () from /lib/libc.so.6
#2  0xf7e68064 in gethostbyaddr () from /lib/libc.so.6
#3  0x00011140 in ?? ()
#4  0x00011140 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) 

Please look to bug 413471 I spend some time to solve may be similar problem.
This problem is only SPARC related and is caused by unaligned access to char
buffer.
When I stop avahi or modify /etc/nsswitch.conf to disable mdns4 and
mdns4_minimal ping not crash.
ssh,telnet,mysql crashed too but only when I ssh,mysql to machine from SPARC
machine and not crash when use i386.














-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: sparc (sparc64)

Kernel: Linux 2.6.20 (SMP w/1 CPU core)
Locale: LANG=cs_CZ, LC_CTYPE=cs_CZ (charmap=ISO-8859-2)
Shell: /bin/sh linked to /bin/bash

Versions of packages libnss-mdns depends on:
ii  avahi-daemon                  0.6.16-5   Avahi mDNS/DNS-SD daemon
ii  base-files                    4.0.0      Debian base system miscellaneous f
ii  libc6                         2.5-3      GNU C Library: Shared libraries
ii  perl                          5.8.8-7    Larry Wall's Practical Extraction 

libnss-mdns recommends no packages.

-- debconf-show failed

Message #10 received at 423222@bugs.debian.org (full text, mbox, reply):

From: Daniel Smolik <marvin@mydatex.cz>

To: 423222@bugs.debian.org

Subject: Bug#423222: Acknowledgement (SIGBUS in _nss_mdns4_gethostbyaddr_r on SPARC)

Date: Thu, 10 May 2007 19:51:16 +0200

Main problem is name of second server. If I rename it to some name 
without numbers crash stops.

			Regards
				Dan Smolik



-- 
Mydatex s r.o.
http://www.mydatex.cz
email: smolik@mydatex.cz
mob: 604200362
tel: 226210085

Message #15 received at 423222-close@bugs.debian.org (full text, mbox, reply):

From: Sjoerd Simons <sjoerd@debian.org>

To: 423222-close@bugs.debian.org

Subject: Bug#423222: fixed in nss-mdns 0.10-0.1

Date: Sun, 13 May 2007 08:47:03 +0000

Source: nss-mdns
Source-Version: 0.10-0.1

We believe that the bug you reported is fixed in the latest version of
nss-mdns, which is due to be installed in the Debian FTP archive:

libnss-mdns_0.10-0.1_sparc.deb
  to pool/main/n/nss-mdns/libnss-mdns_0.10-0.1_sparc.deb
nss-mdns_0.10-0.1.diff.gz
  to pool/main/n/nss-mdns/nss-mdns_0.10-0.1.diff.gz
nss-mdns_0.10-0.1.dsc
  to pool/main/n/nss-mdns/nss-mdns_0.10-0.1.dsc
nss-mdns_0.10.orig.tar.gz
  to pool/main/n/nss-mdns/nss-mdns_0.10.orig.tar.gz



A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 423222@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Sjoerd Simons <sjoerd@debian.org> (supplier of updated nss-mdns package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.7
Date: Sun, 13 May 2007 10:23:16 +0200
Source: nss-mdns
Binary: libnss-mdns
Architecture: source sparc
Version: 0.10-0.1
Distribution: unstable
Urgency: high
Maintainer: Anand Kumria <wildfire@progsoc.org>
Changed-By: Sjoerd Simons <sjoerd@debian.org>
Description: 
 libnss-mdns - NSS module for Multicast DNS name resolution
Closes: 423222
Changes: 
 nss-mdns (0.10-0.1) unstable; urgency=high
 .
   * NMU
   * New upstream release
   * Fixes alignment problems on sparc causing sigBUS (Closes: #423222)
Files: 
 4045c721ce90fcf41ebdda4f4238a3c0 577 admin optional nss-mdns_0.10-0.1.dsc
 03938f17646efbb50aa70ba5f99f51d7 353130 admin optional nss-mdns_0.10.orig.tar.gz
 e1fec6c4b8cfde25289293dc83feea72 8219 admin optional nss-mdns_0.10-0.1.diff.gz
 f27cbbd720a68f0330e38e816c3e51b7 22018 admin optional libnss-mdns_0.10-0.1_sparc.deb

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