[Pkg-samba-maint] Bug#404266: smbclient: nmbclient segfaults when asked to lookup a name through avahi

Steve Langasek vorlon at debian.org
Thu Dec 28 09:32:42 UTC 2006

On Fri, Dec 22, 2006 at 07:05:17PM -0500, Norman Ramsey wrote:
> Package: smbclient
> Version: 3.0.23d-2+b1
> Severity: important

> The following command causes a segfault:

>   smbclient -L bloodhound.local -N

> The machine 'bloodhound.local' is a Windows XP machine running Apple's
> 'Bonjour for Windows'.  As you can see below, other apps can find it:

>   : nr at curlycoat 10308 ; avahi-resolve -4 -n bloodhound.local
>   bloodhound.local

> I've attached an strace output from the segfaulting run and also my smb.conf.

Please provide a backtrace using gdb instead of this strace.

It happens that I'm able to reproduce such a failure here:

(gdb) bt
#0  0x080d364d in timeval_add ()
#1  0xb7fd181b in mdns_query_name () from /usr/lib/libnss_mdns4_minimal.so.2
#2  0xb7fd00d0 in _nss_mdns4_minimal_gethostbyname2_r () from /usr/lib/libnss_mdns4_minimal.so.2
#3  0xb7fd02a6 in _nss_mdns4_minimal_gethostbyname_r () from /usr/lib/libnss_mdns4_minimal.so.2
#4  0xb7d9d48b in gethostbyname_r@@GLIBC_2.1.2 () from /lib/tls/libc.so.6
#5  0xb7d9cdde in gethostbyname () from /lib/tls/libc.so.6
#6  0x080c96d3 in internal_resolve_name ()
#7  0x080ca218 in resolve_name ()
#8  0x08098a59 in cli_connect ()
#9  0x080ad596 in cli_cm_shutdown ()
#10 0x080adb7f in cli_cm_open ()
#11 0x080686e0 in main ()

that looks like a bug in nss_mdns, not in smbclient...

Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
vorlon at debian.org                                   http://www.debian.org/

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