[nsd-users] nsd segfaults when serving a TXT record with two strings

[W.C.A. Wijngaards]

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Hi Stephane,

Since I cannot reproduce, it is not simply the TXT record itself.  Can
you send me (offlist) the zonefile(s), config, and what OS/platform you use?

The error printed says that the memory database has been corrupted.

Best regards,
   Wouter

On 07/04/2011 05:30 PM, Stephane Bortzmeyer wrote:
> On Mon, Jul 04, 2011 at 05:15:12PM +0200,
>  Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote 
>  a message of 15 lines which said:
> 
>> crashes nsd when queried with QTYPE=TXT or ANY:
> 
> And the trace seems to be:
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0x0805c7e5 in query_get_dname_offset (query=0x9176c90, domain=0x9174bb4)
>     at query.h:143
> 143             return query->compressed_dname_offsets[domain->number];
> (gdb) where
> #0  0x0805c7e5 in query_get_dname_offset (query=0x9176c90, domain=0x9174bb4)
>     at query.h:143
> #1  0x0805c8d0 in encode_dname (q=0x9176c90, domain=0x9174bb4) at packet.c:21
> #2  0x0805ca46 in packet_encode_rr (q=0x9176c90, owner=0x91708dc, rr=0x9174b54)
>     at packet.c:76
> #3  0x0805cc09 in packet_encode_rrset (query=0x9176c90, owner=0x91708dc, 
>     rrset=0x9174b44, section=1) at packet.c:126
> #4  0x0804a299 in encode_answer (q=0x9176c90, answer=0xbfbe71fc) at answer.c:76
> #5  0x0805ffbe in answer_query (nsd=0x807f3e0, q=0x9176c90) at query.c:1204
> #6  0x080605a6 in query_process (q=0x9176c90, nsd=0x807f3e0) at query.c:1353
> #7  0x0806645a in server_process_query (nsd=0x807f3e0, query=0x9176c90)
>     at server.c:1211
> #8  0x08066ab5 in handle_udp (netio=0x9175c88, handler=0x9175d10, 
>     event_types=NETIO_EVENT_READ) at server.c:1408
> #9  0x08058806 in netio_dispatch (netio=0x9175c88, timeout=0x0, sigmask=0x0)
>     at netio.c:258
> #10 0x08066875 in server_child (nsd=0x807f3e0) at server.c:1343
> #11 0x08064506 in restart_child_servers (nsd=0x807f3e0, region=0x9170530, 
>     netio=0x9174c80, xfrd_sock_p=0xbfc055c8) at server.c:292
> #12 0x08064e9a in server_start_children (nsd=0x807f3e0, region=0x9170530, 
>     netio=0x9174c80, xfrd_sock_p=0xbfc055c8) at server.c:567
> #13 0x08065caa in server_main (nsd=0x807f3e0) at server.c:977
> #14 0x0805ad33 in main (argc=0, argv=0xbfc05924) at nsd.c:1063
> 
> (gdb) print domain->number
> $4 = 1852383333
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> nsd-users at NLnetLabs.nl
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