CURRENT freezes on Laitude D520

[Robert Watson]

On Sat, 9 Dec 2006, Maxim Konovalov wrote:

> On Sat, 9 Dec 2006, 16:48+0100, yal wrote:
>
>> Last kernel compilation working was on november 27th. Dell Latitude D520 
>> freezes within a few minutes after boot. No errors are show in dmesg. The 
>> internal speaker sounds and acpi stops working.
>
> Try with
>
> debug.mpsafenet="0"
>
> in /boot/loader.conf.  I have similar symptoms with my with my sony 
> pcg505bx.  Please report back your experience.

While this may be useful in doing some initial debugging and working around 
the problem, I'd really appreciate it if people didn't run with 
debug.mpsafenet="0" for any extended period, as it masks bugs rather than 
fixing them, and results in them not getting fixed.  It also leads to a 
significant performance hit, and we really don't want people running with 
debugging features like this turned on by default; I'd rather they used the 
cycles on INVARIANTS and WITNESS.

Do you have any information about the actual source of this problem?  Would it 
motivate solving the problem if I were to remove the debug.mpsafenet tunable? 
:-)

Robert N M Watson
Computer Laboratory
University of Cambridge