Panic on -CURRENT after LDT changes
Joe Marcus Clarke
marcus at marcuscom.com
Fri May 25 18:09:46 UTC 2007
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Attilio Rao wrote:
> 2007/5/24, Joe Marcus Clarke <marcus at marcuscom.com>:
>> On Thu, 2007-05-24 at 20:13 +0200, Attilio Rao wrote:
>> > Jeff Roberson wrote:
>> > > Thanks, Attilio and I will look at this right away.
>> > >
>> > > Jeff
>> > >
>> > > On Wed, 23 May 2007, Joe Marcus Clarke wrote:
>> > >
>> > >> On a -CURRENT build today with Jeff's LDT locking changes, I get an
>> > >> instant, reproducible panic by doing:
>> > >>
>> > >> # cd /usr/src
>> > >> # make -DNO_CLEAN buildworld
>> > >>
>> > >> Backing out the LDT changes to /sys/i386/i386/*machdep* corrects the
>> > >> problem. Here is a dmesg and backtrace. In frame 6, it appears
>> mdp is
>> > >> NULL (i.e. td->td_proc->p_md = 0x0).
>> >
>> > Did you enable WITNESS/INVARIANTS/INVARIANT_SUPPORT?
>>
>> No, this kernel does not have WITNESS or INVARIANTS. I can enable those
>> tomorrow if that would give you more useful information.
>
> It would be very appreciated, since I've been unable to reproduce your
> panic on a centrino dual core.
I'm stopped in the debugger now with WITNESS and friends enabled. Same
backtrace as before. I did a "show locks" and I see:
exclusive spin mutex descriptor tables r = 0 (0xc08369f8) locked @
/usr/src/sys/i386/i386/sys_machdep.c:629
Please let me know what else you'd like to see while I'm at the
debugger. FYI: this is a Pentium 4 with "options SMP" disabled.
Joe
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