system sporadically hangs on shutdown after switching to WITH_NEW_XORG

[Michiel Boland]

Hi. Recently I switched to WITH_NEW_XORG, primarily because the stock X server 
with Intel driver has some issues that make it unusable for me.

The new X server and Intel driver works extremely well, so kudos to whoever made 
this possible.

Unfortunately, I am now experiencing random hangs on shutdown. On shutdown the 
system randomly freezes after

[...] syslogd: exiting on signal 15

I would then expect to see 'Waiting (max 60 seconds) for system process 'XXX' to 
stop messages, but these never arrive.

I paniced the machine in ddb, so I have a crash dump if someone want to look at 
it. The crashinfo is at http://barrytown.boland.org/core.txt (I would have 
pasted it here but it is a bit verbose.)

Machine has an Intel G41 chipset, with a SAMSUNG SSD 830 Series HD, running 
9.1-STABLE r251803. Serial console. GENERIC kernel, expect for options DDB and 
ALT_BREAK_TO_DEBUGGER.

Who knows what's going on here?

Cheers
Michiel