experimental qemu-devel port update, please test!

[Eric Anderson]

On 07/09/07 08:00, Eric Anderson wrote:
> Juergen Lock wrote:
>> On Sun, Jul 08, 2007 at 01:15:35PM -0500, Eric Anderson wrote:
>>> On 07/07/07 09:02, Juergen Lock wrote:
>>>> In article <468EFF46.4060001 at freebsd.org> you write:
>>>>> On 07/05/07 22:31, Eric Anderson wrote:
>>>>> [...]
>>>>> Although now I have the issue where using kqemu-kmod causes my system to 
>>>>> reboot or power off.  :(
>>>>>
>>>>> Any ideas?
>>>> This seems to be a -current issue, it doesn't happen for me at least
>>>> (6.2 and previously also 6.1.)  You could check if it is dependent
>>>> on the version of the used qemu (the 0.9.0 port, the version of
>>>> qemu-devel in ports, or the not-yet-committed updated I posted),
>>>> but I doubt it.  What may help is finding out which commit to -current
>>>> started kqemu to break (find an older version that worked, then
>>>> binary-search), or at least a backtrace from a kernel compiled
>>>> without -fomit-frame-pointer (putting DDB in the config seems to do
>>>> that for amd64 at least, but rebuild the entire kernel.)  There also
>>>> is an open issue for kqemu on amd64 smp,
>>>> 	http://www.freebsd.org/cgi/query-pr.cgi?pr=113430
>>>> dunno if its related...
>>>> 	Juergen
>>> My host is i386, SMP, and it also happens with the current qemu-devel port. 
>>>  It must have been something in -CURRENT that changed, probably since 
>>> May15th-ish.  I can't do a binary search anytime soon to find it.  In the 
>>> past, I've recompiled kqemu and that has done the trick.  I have all the 
>>> debugging built in, but that doesn't stop the system from rebooting or 
>>> powering off.
>> Hmm an UP kernel might be worth a try too...
>>
>> 	Juergen
> 
> 
> Hmm - with and without UP, I get a panic, but I managed to catch a panic 
> in _vm_map_lock, something like:
> 
> _vm_map_lock()
> vm_map_wire()
> kqemu_lock_user_page()
> mon_user_map()
> 
> 
> I'll try to get a real bt..
> 
> Eric

Hmm - I suspect this commit or something near it is the issue:

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/vm/vm_map.c.diff?r1=1.384;r2=1.385;sortby=date;f=h;f=u

Or the 1.384 -> 1.385 change by attilio@ (cc'ed).


Eric