dovecot - Jun 2007 - ?? Error: child 1064 (imap) killed with signal 4

After noticing a commit to the HG repository,

   http://hg.dovecot.org/dovecot-1.0/rev/f88b1e225be5

about,

   " We didn't update last_output timestamp with long fetches,
     causing Dovecot to idle-disconnect the client."

I chekced out the latest from the DOVECOT-1.0 repo, and built again.

Unfortunately, this problem still exists.  Login simply disconnects.

Any help, anyone?

-- Ben

On Sun, 2007-06-17 at 17:15 -0700, Benton Haynes wrote:
> Unfortunately, this problem still exists.  Login simply disconnects.
Like Gunter said, signal 4 is SIGILL. It happens only if the CPU
executes invalid instructions. The problem isn't with Dovecot, it's with
your compiler, libraries or something else.

You could try running imap manually with gdb:

gdb /usr/local/libexec/dovecot/imap
r

Does it crash immediately? If not, give it "1 select inbox" command
and
I suppose then it at least should.

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Hi Timo,

Thanks for the instruction as to how to debug this.
> You could try running imap manually with gdb:
>    gdb /usr/local/libexec/dovecot/imap
>    r
I've not used gdb before.  Reading MAN page, and some instructions online, I
tried to launch as you had instructed, but it died off.

gdb --quiet /usr/local/libexec/dovecot/imap
 Reading symbols for shared libraries ..... done
(gdb) r
 Starting program: /usr/local/libexec/dovecot/imap
 Reading symbols for shared libraries .++ done
 imap(root): Error: Ambiguous mail location setting, don't know what to do
with it: /var/mail/root (try prefixing it with mbox: or maildir:)
 imap(root): Fatal: Failed to create storage with data: /var/mail/root

 Program exited with code 0131.
(gdb) q


Next, I instead tried to launch imap manually from the command line, with
the goal of then 'attach'-ing the PID in gdb, but it also fails.


 /usr/local/libexec/dovecot/imap
 imap(root): Error: Ambiguous mail location setting, don't know what to do
with it: /var/mail/root (try prefixing it with mbox: or maildir:)
 imap(root): Fatal: Failed to create storage with data: /var/mail/root

Since dovecot starts ok when I do

 /usr/local/sbin/dovecot -c /etc/dovecot/dovecot.conf

I thought it might need the configuration file, too.

But, the same error happens.

 /usr/local/libexec/dovecot/imap -c /etc/dovecot/dovecot.conf
 imap(root): Error: Ambiguous mail location setting, don't know what to do
with it: /var/mail/root (try prefixing it with mbox: or maildir:)
 imap(root): Fatal: Failed to create storage with data: /var/mail/root

Any further pointers?  Thanks for being patient.

-- Ben