Date: Wed, 10 Oct 2001 11:47:37 -0600 (MDT) From: Heath Nielson <heath@cs.byu.edu> To: <stable@FreeBSD.org> Cc: <sos@FreeBSD.org> Subject: Panic on DVD read Message-ID: <Pine.LNX.4.33.0110101116240.10043-200000@organ.cs.byu.edu>
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Hello-
I've been trying recently to get the DVD player ogle/libdvdread/libdvdcss
working on my computer. When I run the command,
ogle -u cli /dev/dvd
the computer panics after cracking a few of the keys on the DVD. The
panic occurs at the same place each time. I narrowed the problem down to
a read(2) call being made on the DVD by libdvdcss, when the panic occurs.
The panic (transcribed) is as follows:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x3a
fault code = supervisor write, page not present
instruction pointer = 0x8:0xc021e20f
stack pointer = 0x10:0xc02b3d3c
frame pointer = 0x10:0xc02b3ddc
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 = Idle
interrupt mask = bio
trap number = 12
panic: page fault
syncing disks ...
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x30
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc020cd04
stack pointer = 0x10:0xc02b3b60
frame pointer = 0x10:0xc02b3b68
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 = Idle
interrupt mask = bio
trap number = 12
dump ata0: resetting devices .. done
dumping to dev #ad/0x20001, offset 16512
511
At this point the dump stops so I can't get a kernel core, all the while
the DVD drive's read light remains on solid.
I noticed in the log after rebooting the message:
ata1-master: too many segments in DMA table
Thinking this might have something to do with the DVD-ROM not supporting
DMA well, I forced it into pio mode, reran the test and received the exact
same panic without the "too many segments in DMA table" message.
Does anyone have any clue what might be occurring here? I've cc'ed Søren
Schmidt since this seems to be related to the ata driver. I've also included
a dmesg of my system if it can help.
Any help in diagnosing this problem would be appreciated.
Heath
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