Re: 4.0-CURRENT SMP crash with vinum raid-5 and softupdates

[Matthew Dillon]

:Greg's debugging this on the machine here at the moment, which is
:crashing the same way in what appears to be the same place.
:
:If anyone else wants to take a crack it, the magic vinum debug number
:needed is 328 and not 324.
:
:So far Greg's discovered that the field is correctly set a little while
:before the crash, and then becomes NULL for no apparent reason.  Looks
:like a really nasty bug.
:
:The nice thing is this loaner machine has no real job to do besides
:crashing, so it can crash as often as required.  :)
:
:
:       -- Parag

    I looked at the vinum code a little.  I would look for possible situations
    where the bp may be re-issued as an I/O before actually completing a prior
    I/O.  This could cause the iodone field to be cleared in the middle of
    an I/O.  I don't see anything specific in the code because I don't really
    understand it yet.  That's the best possibility that I can come up with.

                                                -Matt



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