Re: 5.2-R panic: bad pte

On Tue, 13 Jan 2004, Doug White wrote:

> On Tue, 13 Jan 2004, Igor Sysoev wrote:
> 
> > > > I've cvsuped the sources 5.2-BETA to 5.2-RELEASE. While rebuilding
> > > > the system (make -j 3 buildworld) on 5.2-RELEASE kernel I've got the
> > > > following panic:
> > > >
> > > > panic: bad pte <<< this is the problem
> > > > cpuid = 0;
> > > > boot() called on cpu#0
> > >
> > > Hardware description?
> 
> In a nutshell... 2x2.8GHz xeons in a serverworks board of some
> construction.  I have an IBM behind me here that while I haven't tested a
> full buildworld on, I did install a few times and didn't get any panics.
> Got a broken keyboard though :)
> 
> I'm not aware of any outstanding pte-based issues. Perhaps the system has
> bad memory or processor?

I do not think that it's hardware problem.
And I think that "panic: sleeping thread owns a non-sleepable lock" is
the problem and "panic: bad pte" is a side effect because there is a single
panic in back trace and this panic() has the same message:

(kgdb) bt
#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:240
#1  0xc051067d in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:372
#2  0xc0510a4e in panic () at /usr/src/sys/kern/kern_shutdown.c:550
#3  0xc053595b in propagate_priority (td=0xc8252780)
    at /usr/src/sys/kern/subr_turnstile.c:176

[ ... ]

(kgdb) up 3
0xc053595b in propagate_priority (td=0xc8252780)
    at /usr/src/sys/kern/subr_turnstile.c:176
176                     KASSERT(!TD_IS_SLEEPING(td),
(kgdb) l
171                      * first thread to grab a slock of a sx lock.  In that case
172                      * it is possible for us to be at SSLEEP or some other
173                      * weird state.  We should probably just return if the state
174                      * isn't SRUN or SLOCK.
175                      */
176                     KASSERT(!TD_IS_SLEEPING(td),
177                         ("sleeping thread (pid %d) owns a non-sleepable lock",
178                         td->td_proc->p_pid));
179
180                     /*
(kgdb)


Igor Sysoev
http://sysoev.ru/en/