Date: Thu, 15 Nov 2001 23:33:37 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "Kenneth D. Merry" <ken@kdm.org> Cc: Dirk Froemberg <dirk@FreeBSD.ORG>, stable@FreeBSD.ORG Subject: Re: kernel panic if using SCSI CDROM as root device Message-ID: <5832.1005863617@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 15 Nov 2001 15:22:26 MST." <20011115152226.A35113@panzer.kdm.org>
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In message <20011115152226.A35113@panzer.kdm.org>, "Kenneth D. Merry" writes:
>On Thu, Nov 15, 2001 at 23:11:16 +0100, Dirk Froemberg wrote:
>> Hi Kenneth!
>>
>> On Thu, Nov 15, 2001 at 02:56:15PM -0700, Kenneth D. Merry wrote:
>> > [...]
>> > Can you find out what line of code in dsioctl is causing the problem?
>> >
>> > If you built a debug kernel, you can do the following:
>> >
>> > gdb -k kernel.debug
>> > list *(dsioctl+0x42)
>> >
>> > That should indicate which line in dsioctl is blowing up.
>>
>> Yes, of course:
>>
>> % gdb -k kernel.debug
>> GNU gdb 4.18
>> [...]
>> (kgdb) list *(dsioctl+0x42)
>> 0xc01b5216 is in dsioctl (/usr/src/sys/kern/subr_diskslice.c:357).
>> 352 struct partition *pp;
>> 353
>> 354 slice = dkslice(dev);
>> 355 ssp = *sspp;
>> 356 sp = &ssp->dss_slices[slice];
>> 357 lp = sp->ds_label;
>> 358 switch (cmd) {
>> 359
>> 360 case DIOCGDVIRGIN:
>> 361 lp = (struct disklabel *)data;
>> (kgdb)
>>
>> Regards Dirk
>
>Thanks!
>
>Poul-Henning, any idea why this might be blowing up? It looks like the
>slice pointer isn't initialized for some reason.
Has the disk actually been opened ?
I have fixed some instances where some of the boot-glue would issue
ioctl' calls to disks which were not yet opened, that used to work,
despite being a gross error.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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