AIX 4.3.3/OpenSSH 3.5p1 Crashing

Darren Tucker dtucker at
Tue Mar 4 11:27:26 EST 2003

Robert A Uhl wrote:
> I'm getting core dumps from sshd when logging in using password
> authentication (using a public key works just fine). The core dump occurs
> just after entering a password--whether that password is correct or not. It
> only happens on this one machine. I've tried recompiling the entire
> setup--zlib, openssl & openssh--and the crash still occurs. It doesn't look
> like the putty-failure issue discussed in the archives, although it may be
> related. Anyone have any ideas?

The core dump might be caused by the fatal_cleanup bug (can't get on to
bugzilla right now, but the patch for it is below).  If so, the core
dump is not the cause of your authentication problem (but might be
triggered by it).

The other thing you can do is to get a backtrace to show exactly where
the failure is ocurring, eg:

# gdb ./sshd core
(gdb) backtrace


Index: log.c
RCS file: /cvs/openssh/log.c,v
retrieving revision 1.26
retrieving revision 1.27
diff -u -r1.26 -r1.27
--- log.c       7 Jan 2003 06:04:18 -0000       1.26
+++ log.c       14 Jan 2003 11:22:43 -0000      1.27
@@ -233,6 +233,7 @@
                next_cu = cu->next;
+       fatal_cleanups = NULL;
 /* Cleanup and exit */

Darren Tucker (dtucker at
GPG Fingerprint D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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