On Sunday, 29 August 1999 at 23:09:48 -0700, Parag Patel wrote:
> On Sun, 29 Aug 1999 22:59:22 PDT, Matthew Dillon wrote:
>>
>> This is definitely a pbuf. Did you apply the patches Greg emailed?
>> They will panic the machine earlier while it is still in the correct
>> stack frame, allowing Greg to track down where the I/O initiation came
>> from.
>
> 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.
To expand on what Parag says, the check in launch_requests shows no
problems with the buffer headers, but the check in biodone catches a
bp with B_CALL set and b_iodone set to NULL. I'd guess that something
in the iodone chain code is incorrect. Unfortunately, there were so
many active requests that I couldn't find the one that caused the
crash in the log buffer; theoretically it might even have nothing to
do with it. Does this ring a bell with anybody?
Greg
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