Date: Fri, 24 Oct 1997 22:30:05 -0500 (CDT) From: uhclem@nemesis.lonestar.org To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/4845: Boot complains about disk slices in FAT partitions - FDIV075 Message-ID: <199710250330.WAA00369@skaro.lonestar.org> Resent-Message-ID: <199710250330.UAA09020@hub.freebsd.org>
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>Number: 4845
>Category: kern
>Synopsis: Boot complains about disk slices in FAT partitions - FDIV075
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Oct 24 20:30:00 PDT 1997
>Last-Modified:
>Originator: Frank Durda IV
>Organization:
None
>Release: FreeBSD 2.2.5-RELEASE i386
>Environment:
Pentium 120MHz system with Adaptec 1542 controller with one 2GB SCSI
drive. 32MB of RAM
>Description:
On a drive that had previously contained only a single FreeBSD partition
(created under 2.2.5 101897 BETA), a new install of the release 2.2.5
was done. This time, during the FreeBSD install, a different drive
division was specified. First, a 50Meg Type 6 (FAT) partition was
defined (using the FreeBSD install disk), and the rest of the disk was
assigned to a FreeBSD (165) partition. In the FreeBSD partition, a 150Meg
root, 240Meg swap, 400Meg /usr, 800Meg /usr/src and a ~470Meg /a were
defined. The install proceeded normally.
Here is what fdisk says:
******* Working on device /dev/rsd0 *******
parameters extracted from in-core disklabel are:
cylinders=2069 heads=64 sectors/track=32 (2048 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=2069 heads=64 sectors/track=32 (2048 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 6,(Primary 'big' DOS (> 32MB))
start 32, size 102368 (49 Meg), flag 0
beg: cyl 0/ sector 1/ head 1;
end: cyl 49/ sector 32/ head 63
The data for partition 2 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 102400, size 4134912 (2019 Meg), flag 80
beg: cyl 50/ sector 1/ head 0;
end: cyl 1023/ sector 32/ head 63
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
The fstab says:
# Device Mountpoint FStype Options Dump Pass#
/dev/sd0s2b none swap sw 0 0
/dev/sd0a / ufs rw 1 1
/dev/sd0s2g /a ufs rw 2 2
/dev/sd0s2e /usr ufs rw 2 2
/dev/sd0s2f /usr/src ufs rw 2 2
proc /proc procfs rw 0 0
Note that theye are no references to partition 1, not even a mount as
type MS-DOS. Note also that we have not yet booted MS-DOS, so residue
from the old FreeBSD filesystem and slice data remain in the MS-DOS
portion of the disk.
On reboot, the kernel for some reason looked into the type 6 partition,
and saw the traces of the old slice data from the previous installation
of FreeBSD which still linger in the partition now reserved for MS-DOS,
and these messages came out:
Oct 24 21:30:48 skaro /kernel: changing root device to sd0a
Oct 24 21:30:48 skaro /kernel: sd0s1: raw partition size != slice size
Oct 24 21:30:48 skaro /kernel: sd0s1: start 32, end 102399, size 102368
Oct 24 21:30:48 skaro /kernel: sd0s1c: start 32, end 4237311, size 4237280
Oct 24 21:30:48 skaro /kernel: sd0s1: truncating raw partition
Oct 24 21:30:48 skaro /kernel: sd0s1: rejecting partition in BSD label: it isn't entirely within the slice
Oct 24 21:30:48 skaro /kernel: sd0s1: start 32, end 102399, size 102368
Oct 24 21:30:48 skaro /kernel: sd0s1a: start 32, end 307231, size 307200
Oct 24 21:30:48 skaro /kernel: sd0s1: rejecting partition in BSD label: it isn't entirely within the slice
Oct 24 21:30:48 skaro /kernel: sd0s1b: start 307232, end 512031, size 204800
Oct 24 21:30:48 skaro /kernel: sd0s1: rejecting partition in BSD label: it isn't entirely within the slice
Oct 24 21:30:48 skaro /kernel: sd0s1e: start 512032, end 2187295, size 1675264
Oct 24 21:30:48 skaro /kernel: sd0s1: rejecting partition in BSD label: it isn't entirely within the slice
Oct 24 21:30:49 skaro /kernel: sd0s1f: start 2187296, end 3211295, size 1024000
Oct 24 21:30:49 skaro /kernel: sd0s1: rejecting partition in BSD label: it isn't entirely within the slice
Oct 24 21:30:49 skaro /kernel: sd0s1g: start 3211296, end 4237311, size 1026016
Despite the alarming look of these messages, the slices that were supposed
to be found on partition 2 were found, and mounted sucessfully.
But to get the kernel to stop sticking its nose into the MS-DOS type 6
partition and putting these messages out on each boot, I had to install
MS-DOS in partition 1 and wipe out the remaining bits of the old FreeBSD
install. I suspect the kernel is still looking in there, but isn't
finding anything it recognizes at all.
In my opinion, the slice code should not be investigating non-165-type
partitions for slices.
>How-To-Repeat:
Install FreeBSD on entire disk. Re-install, but define small MS-DOS
partition in first part of the disk, do not format or install MS-DOS yet,
then install FreeBSD in remainder of disk, and finally, reboot FreeBSD
and look at the boot messages.
>Fix:
I suggest testing the partition type for known-slicable partition values
before hunting for possible slice data in that partition.
>Audit-Trail:
>Unformatted:
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