Re: Filesystem tests crashing host

[Paul Goyette <paul%whooppee.com@localhost>]

(Resending, this time with subject line and cc's)

> > I still say revert rmind's changes of 2011.04.11.22.31.43, because
> > that's when the failures started.  My logs show six test runs > between 
> christos' change to kern_descrip.c (at 2011.04.10.15.45.33) > and rmind's 
> changes, and none of those test runs paniced; after > rmind's changes, every 
> single test run has paniced.
>
> Problem is not diagnosed.  It cannot be reproduced on real hardware,
> and I do not see how f_ops can become invalid when using semaphore.
> Even if we assume that it can - the semaphore code should actually be
> *used* in the first place.  However, it seems that neither failing
> ATF tests, nor ATF itself are using semaphores.  Can somebody prove
> me wrong on this?
>
> Perhaps a simple printf("f_type = %d\n", fp->f_type) would hint what
> type of descriptor is actually failing.  Also, a wild guess - can one
> reproduce the problem with the following changes reverted:

I'm working on building kernels with each commit backed out - it will take a 
while.

However, I have been able to dump the file structure:

        f_offset        0000 0000 0000 0000
        f_cred          ffff 8000 098e db40
        f_ops           ffff ffff 80ef fac0
        f_data          ffff 8000 09de 28c0
        f_list.next     ffff 8000 0ab7 f4c0
        f_list.prev     ffff ffff 80cb 2728
        f_lock          0000 0000 0000 0000
        f_flag          0000 0003
        f_marker        0000 0000
        f_type          0000 0008
        f_advice        0000 0000
        f_count         0000 0000
        f_msgcount      0000 0000
        f_unpcount      0000 0000
        f_unplist.next  0000 0000 0000 0000

Note that both the f_ops and f_list.prev pointers seem to be corrupt, and that 
the type of this structure is semaphore = 8


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