[Ardour-Users] gain automation point is crashing jackd

[Justin M. Streiner]

I'm trying to master the last song of a project I've been working on for 
quite some time and it seems that a gain automation data point in one 
channel of the song will crash jackd, at which point Ardour pops up an 
error that it's been disconnected from JACK and jamin freezes up.

If I let everything sit for a bit (~30 seconds), Ardour will sometimes 
crash.  The only way I've found to get everything going again is to exit 
Ardour and jamin, and re-start them.

The problem definitely appears to be specific to one gain automation 
data point.  If I move the point earlier or later in the channel, the 
crash follows the change.  If I stop playback, move the playhead past the 
offending point and resume, the remainder of the song plays without 
issues.

I get the following error at the time of the crash, in the terminal window 
I used to launch Ardour and jamin:

(ardour-2.3:17589): Gdk-CRITICAL **: gdk_drawable_real_draw_pixbuf: 
assertion `src_y >= 0 && src_y + height <= pixbuf->height' failed
subgraph starting at jamin timed out (subgraph_wait_fd=13, status = 0, 
state = Running)

It also happens whether I'm mastering this song (routing Ardour's master 
outs to jamin's INs, then routing jamin's OUTs to a separate stereo track 
in Ardour) or just playing the tracks back.  The error only happens when 
both Ardour and jamin are running.

This is hapening on my main workstation:
   2.8 GHz Pentium 4, 2 GB RAM, SATA drives (verified good transfer rates
with hdparm and bonnie++)
Gentoo, Intel x86, 32-bit, 2.6.24-r3 kernel, configured for low-latency
   operation.
ALSA version is whatever was wired into this kernel
Ardour 2.3.1 from Gentoo's portage tree
jack 0.109.2 from Gentoo's portage tree, running in realtime mode, 48kHz
   sample rate, buffer size 1024, 2 buffers

There is nothing unusual about the gain automation point in question.

Any ideas?  I didn't see anything related in mantis/forums/google.

Thanks
jms