CDROM Unknown Transfer Error crashes system
Lowell Gilbert
freebsd-questions-local at be-well.ilk.org
Thu Oct 13 07:52:55 PDT 2005
Wayne Witzke <wwitzke at sstire.com> writes:
> Lowell Gilbert wrote:
> > Wayne Witzke <wwitzke at sstire.com> writes:
> >
> >>I'm a little confused... I thought I had RELENG_5_4. "uname -a" says:
> >>
> >>FreeBSD wlaptop 5.4-RELEASE FreeBSD 5.4-RELEASE #1: Thu Oct 6
> >>21:18:29 EDT 2005
> >> root at wlaptop:/usr/obj/usr/src/sys/WLAPTOP i386
> >>
> >>Isn't this RELENG_5_4?
> > It was, but some patches have been applied since the release was
> > made. I was suggesting RELENG_5, not RELENG_5_4; in other words, the
> > branch that will eventually become the 5.5 release.
>
> I'll see if I can't figure out how to do this, then. I had no idea
> that I wasn't running the most current.
What you are running is the more recent release. But FreeBSD's
developers have continued to modify code in the six months or so since
then.
> >>Lowell Gilbert wrote:
> >
> >>>>Is there anything that I can do to capture more information the next
> >>>>time my computer reboots spontaneously?
> >>>
> >>>Try to get a crash dump. There's more information on it in the
> >>>Handbook. And some related information on panic analysis (if you can
> >>>get it to that point) in the FAQ.
> >>>
> >>
> >>I'll try that, it doens't sound too difficult. Just so I know, if I
> >>was going to see a kernel panic message, I'd be seeing one before the
> >>computer reboots, right?
> > I thought that was what you were describing in earlier messages.
>
> I'm *NOT* getting anything of this form (from the FAQ):
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x40
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xf014a7e5
> stack pointer = 0x10:0xf4ed6f24
> frame pointer = 0x10:0xf4ed6f28
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 80 (mount)
> interrupt mask =
> trap number = 12
> panic: page fault
>
> All I get is the single line error message in the system log:
>
> acd0: unknown transfer phase
>
> and then the computer drops to a POST and reboots. I see nothing on
> my screen between the error and the POST.
Ah. A spontaneous reboot, not a panic. Sorry I misunderstood.
> One of the diagnostic steps that the FAQ mentions is to trace the
> instruction pointer. My assumption was that if the system was going
> to give me a message like that, I'd see it before the POST, but I
> wanted to make sure that I didn't need to be looking for that message
> in a log somewhere, or changing a configuration option somewhere to
> make the system generate an error message of that form, because I
> definitely don't see that before the POST.
A debugging kernel may help.
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