Re: 7.0 CURRENT kernel's ath driver causes page fault, kernel panic (debugging kernel)

On Sat, Jul 19, 2008 at 8:57 AM, Edward Ruggeri <smallhand@xxxxxxxxxxxx> wrote:
On Fri, Jul 18, 2008 at 7:29 PM, Edward Ruggeri <smallhand@xxxxxxxxxxxx> wrote:
As for the actual debug process, there's a spot in the dev handbook
about it (http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html),
but when I tried debugging my issue with NTFS and SMB I didn't really
find it helpful to be honest...

AND

You may also have to compile without SMP and with the 4BSD scheduler
just to see whether or not it's an issue reproducible with the ULE
scheduler, the driver, or something else...

I have a couple dumps now, with different kernel configurations. In
addition to the debugging options Garrett has recommended, I've
switched from the ULE to the 4BSD scheduler and removed SMP support.
The error persists.

The backtrace in kgdb says that panic is called from the function
ath_start at line 1748 in ath_start.c. Here is a snippet:

bf = STAILQ_FIRST(&frags);
KASSERT(bf != NULL, ("no buf for txfrag"));

Does that sound like enough to file a problem report with? What other
information would be desired?

You might want to first update the kernel and userland to 7-RELENG
first. If the issue persists in 7-RELENG, I'd file a PR. Regardless of
whether or not the issue persists I would contact the maintainer to
let them know about the bug.
Cheers,
-Garrett
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