There's no additional process that shows up, under top or pstree. strace
on the X process once it's hung shows:
10:00:47.970272 select(256, [1 3 4 10 11 12], NULL, NULL, {447, 556000}
Typing keys on the keyboard does break that select() and cause things to
happen in strace -- so I guess X is at least semi-alive and getting
keyboard events, just not reacting to them. (ctl-alt-backspace causes
strace activity but doesn't cause the X server to quit.)
Just in case it helps anybody, I'll attach a log of what strace shows
when I type ctl-alt-Backspace. I'm not seeing anything obvious here, but
maybe someone more familiar with X might see something.
Did I mention that killing X doesn't bring the machine back? The X
process dies but the screen doesn't come back, and sequences like ctl-
alt-F2 don't help. Worse, I can't reboot cleanly either: typing reboot
from the remote shell prints a message that it's going to reboot, breaks
the network connection, then the machine goes into a CPU-spinning loop
and pulling the plug is the only solution I've found.
** Attachment added: "strace log from typing ctl-alt-backspace"
http://librarian.launchpad.net/5108847/strace.log
--
X server (S3 Savage) freezing with DRI
https://launchpad.net/bugs/41340
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