system sporadically hangs on shutdown after switching to WITH_NEW_XORG

[Konstantin Belousov]

On Sun, Jun 16, 2013 at 05:11:15PM +0200, Michiel Boland wrote:
> 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?

I do not see anything related to i915 in the core.txt you provided.

Next time the machine hangs, start with the output of ps command from
ddb and 'show allpcpu', together with 'alltrace'.
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