Date: Sat, 07 Oct 2000 22:58:20 -0400 (EDT) From: Bosko Milekic <bmilekic@dsuper.net> To: gibbs@freebsd.org Cc: freebsd-current@FreeBSD.ORG Subject: Re: latest ahc panic, more data ... Message-ID: <Pine.BSF.4.21.0010072233400.285-100000@jehovah.technokratis.com> In-Reply-To: <Pine.BSF.4.21.0010072208460.9375-100000@hub.org>
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I've just been hit by one such problem on bootup. This is -current as of
today, so I suspect it's the commits that went in the past two days.
Basically, I tracked it down just enough to know that the problem is
happening during a call to ahc_print_path() in aic7xxx.c, specifically
for me, this happens during bootup in ahc_handle_scsiint() right after
the second call to ahc_abort_scbs().
ahc_print_path() is called like this:
ahc_print_path(ahc, scb);
(why both ahc and scb are being passed, I have no idea, since
ahc_print_path only actually makes use of scb).
For the unaware, ahc_print_path() seems to only wrap a call to
xpt_print_path() to which it passes scb->io_ctx->ccb_h.path as an
argument, and in this case, scb->io_ctx happens to be NULL, so during its
pass, a NULL pointer gets dereferenced and the page fault happens.
The NULLing out of this is coming somewhere in ahc_handle_scsiint(),
because some prior ahc_print_path()s (with the same arguments) are
succeeding.
I have not tried backing out the changes from the past two days and
trying again, but this was not happening a week ago.
So what's going on here?
On Sat, 7 Oct 2000, Marc G. Fournier wrote:
>
> okay, have been watching the conversation going on in the committers list,
> and am watching for any new commits that seem appropriate, but figure
> adding a little bit of extra info as I come up with it might help?
>
> latest reboot had a bit more info then the last, and started with:
>
> ahc0:A:1: ahc_intr - referenced scb not valid during seqint 0x73 scb(147)
> ach0: WARNING no command for scb 147 (cmdcmplt)
> QOUTPOS=132
>
> Marc G. Fournier scrappy@hub.org
> Systems Administrator @ hub.org
> scrappy@{postgresql|isc}.org ICQ#7615664
Bosko Milekic
bmilekic@technokratis.com
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