Ssh has stopped working - reverse mapping causes segmentation fault

This was working on Friday, believe me. I haven't done anything that I'm aware of (apart from reboot the machine) to change things, except in trying to fix it.
Briefly, ssh crashes out with a segmentation fault and a crash log (below). Poking around with verbosity gives (real ip obscured):
% ssh ip4 -vvvv
OpenSSH_3.8.1p1, OpenSSL 0.9.7i 14 Oct 2005
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to ip4 [ip4] port 22.
debug1: Connection established.
debug1: identity file /Users/rpg/.ssh/identity type -1
debug1: identity file /Users/rpg/.ssh/id_rsa type -1
debug1: identity file /Users/rpg/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.8.1p1
debug1: match: OpenSSH_3.8.1p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug3: Trying to reverse map address ip4.
Segmentation fault
I get similar reports for %ssh FQDN and %ssh $USER@[FQDN*|*ip4].
Although I'm trying to ssh to a machine on another continent, trying to ssh into my own machine (from a Terminal window on my own machine) also does not work. Setting UseDNS no in /etc/sshd_config on my machine does not help. Oddly, trying to ssh to my own machine by
%ssh 127.0.0.1 gives
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug3: Trying to reverse map address 127.0.0.1.
debug1: An invalid name was supplied
Configuration file does not specify default realm
debug1: An invalid name was supplied
A parameter was malformed
Validation error
debug1: An invalid name was supplied
Configuration file does not specify default realm
debug1: An invalid name was supplied
A parameter was malformed
Validation error
debug1: SSH2MSGKEXINIT sent
debug1: SSH2MSGKEXINIT received
and then works (after a lot more info).
I can ssh into this machine from elsewhere, I just can't ssh out. Below the crash log is a report from running a server with
% sudo sshd -D -ddd -e -p 10000
and connecting with
% ssh -vvv -p 10000 $USER@FQDN
ssh crash log:
Date/Time: 2006-05-29 15:42:09.284 +1000
OS Version: 10.4.6 (Build 8I1119)
Report Version: 4
Command: ssh
Path: /usr/bin/ssh
Parent: bash [1020] (note: also fails under tcsh)
Version: ??? (???)
PID: 1021
Thread: 0
Exception: EXCBADACCESS (0x0001)
Codes: KERNINVALIDADDRESS (0x0001) at 0xb1d255e4
Thread 0 Crashed:
0 libstdc++.6.dylib 0x90b37e3a _cxa_getglobals + 324
1 libstdc++.6.dylib 0x90b3853a _gxx_personalityv0 + 658
2 libgcc_s.1.dylib 0x90bcabf7 UnwindRaiseException + 147
3 libstdc++.6.dylib 0x90b38857 _cxathrow + 87
4 edu.mit.Kerberos 0x94c4a238 CCIContextDataMachIPCStub::OpenCCache(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) + 314
5 edu.mit.Kerberos 0x94c49fde CCEContext::OpenCCache(cccontextd*, char const*, ccccached**) + 160
6 edu.mit.Kerberos 0x94c49d5e cc_open + 64
7 edu.mit.Kerberos 0x94c49bf6 krb5stdccresolve + 182
8 edu.mit.Kerberos 0x94c4f1a1 __KLGetCCacheByName + 254
9 edu.mit.Kerberos 0x94c4ee8a __KLAcquireInitialTicketsForCache + 179
10 edu.mit.Kerberos 0x94c4ed7f krb5intccdefault + 85
11 edu.mit.Kerberos 0x94c40215 krb5gss_acquirecred + 2409
12 edu.mit.Kerberos 0x94c4ed11 kggetdefcred + 73
13 edu.mit.Kerberos 0x94c4da14 krb5gss_init_seccontext + 208
14 ssh 0x00024305 0x1000 + 144133
15 ssh 0x000246f4 0x1000 + 145140
16 ssh 0x000247fb 0x1000 + 145403
17 ssh 0x0000c462 0x1000 + 46178
18 ssh 0x0000a251 0x1000 + 37457
19 ssh 0x000042c7 0x1000 + 12999
20 ssh 0x000025f2 0x1000 + 5618
21 ssh 0x0000250d 0x1000 + 5389
Thread 0 crashed with i386 Thread State:
eax: 0x00000000 ebx: 0x90b3880d ecx:0xbfffda7c edx: 0xa4c425a0
edi: 0xb1d255e4 esi: 0xa4c425a0 ebp:0xbfffd9e8 esp: 0xbfffd9b0
ss: 0x0000002f efl: 0x00010246 eip:0x90b37e3a cs: 0x00000027
ds: 0x0000002f es: 0x0000002f fs:0x00000000 gs: 0x00000037
sudo sshd -D -ddd -e -p 10000:
debug2: readserverconfig: filename /etc/sshd_config
debug1: sshd version OpenSSH_3.8.1p1
debug1: private host key: #0 type 0 RSA1
debug3: Not a RSA1 key file /etc/sshhost_rsakey.
debug1: read PEM private key done: type RSA
debug1: private host key: #1 type 1 RSA
debug3: Not a RSA1 key file /etc/sshhost_dsakey.
debug1: read PEM private key done: type DSA
debug1: private host key: #2 type 2 DSA
debug1: Bind to port 10000 on ::.
Server listening on :: port 10000.
debug1: Bind to port 10000 on 0.0.0.0.
Server listening on 0.0.0.0 port 10000.
Generating 768 bit RSA key.
RSA key generation complete. <- pause here
debug1: Server will not fork when running in debugging mode.
Connection from ip4 port 50148
debug1: Current Session ID is 00B16810 / Session Attributes are 00008030
debug1: Creating new security session...
debug1: New Session ID is 0F7C2940 / Session Attributes are 00009020
debug1: Client protocol version 2.0; client software version OpenSSH_3.8.1p1
debug1: match: OpenSSH_3.8.1p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-1.99-OpenSSH_3.8.1p1
debug2: Network child is on pid 1101
debug3: preauth child monitor started
debug3: mmrequestreceive entering
debug3: privsep user:group 75:75
debug1: permanentlysetuid: 75/75
debug1: listhostkeytypes: ssh-rsa,ssh-dss
debug3: mmrequestsend entering: type 40
debug3: mmrequest_receiveexpect entering: type 41
debug3: mmrequestreceive entering
debug3: monitor_read: checking request 40
debug1: Miscellaneous failure
No such file or directory
debug3: mmrequestsend entering: type 41
debug3: mmrequestreceive entering
debug1: no credentials for GSSAPI mechanism Kerberos
debug1: SSH2MSGKEXINIT sent
Connection closed by ip4
debug1: do_cleanup
debug1: PAM: cleanup
debug3: PAM: sshpamthreadcleanup entering
debug1: do_cleanup
debug1: PAM: cleanup
debug3: PAM: sshpamthreadcleanup entering
and
% ssh -vvv -p 10000 $USER@FQDN :
OpenSSH_3.8.1p1, OpenSSL 0.9.7i 14 Oct 2005
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to FQDN [ip4] port 10000.
debug1: Connection established.
debug1: identity file /Users/rpg/.ssh/identity type -1
debug1: identity file /Users/rpg/.ssh/id_rsa type -1
debug1: identity file /Users/rpg/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.8.1p1
debug1: match: OpenSSH_3.8.1p1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug3: Trying to reverse map address ip4.
Segmentation fault

10.4.7 fixed this.
But broke iCal. . .
Actually, I never had any problems with 10.4.6, but ssh on my nat'ed Intel Macbook now segfaults when doing reverse mapping after upgrading to 10.4.7.
OpenSSH_3.8.1p1, OpenSSL 0.9.7i 14 Oct 2005
debug1: Reading configuration data /etc/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to amrshampine [10.4.51.45] port 22.
debug1: Connection established.
debug1: identity file /Users/lindkvis/.ssh/identity type -1
debug1: identity file /Users/lindkvis/.ssh/id_rsa type -1
debug1: identity file /Users/lindkvis/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.6.1p2
debug1: match: OpenSSH_3.6.1p2 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_3.8.1p1
debug3: Trying to reverse map address 10.4.51.45.
Macbook White 13" 1.83GHz 1GB   Mac OS X (10.4.6)  

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