kgdb of kernel issues FB7.0

[Kayven Riese]

I was running my FreeBSD 7.0-RELEASE (160GB HD) on this laptop:

http://www.monkeyview.net/id/965/fsck/dmesg/PB12001901.vhtml

Right now I am swapped out

http://www.monkeyview.net/id/965/fsck/torrent/p5120212.vhtml

but I have the problem disk mounted using this:

http://www.monkeyview.net/id/965/fsck/torrent/p5120226.vhtml

This is a much older disk with 60GB and
$ uname -a
FreeBSD  6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30 UTC
2007     root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/SMP  i386
$

It makes clunking sounds sometimes, but for the most part it seems to run
fine.

Some diagnostics on the 160GB HD FB 7.0 that have been done:

# mount /dev/da0s4 /mnt/usr
# fsck_ufs -y /mnt/usr
** /dev/da0s4 (NO WRITE)
** Last Mounted on /mnt/usr
** Phase 1 - Check Blocks and Sizes
INCORRECT BLOCK COUNT I=2779162 (4 should be 0)
CORRECT? no

fsck_ufs: cannot alloc 871186332 bytes for inoinfo
#

I have been told that doing fsck while mounted is a very bad thing, but I
did fsck before the
above depicted instantiation of the fsck command and after this and it
always did the same
thing. I have done fsck using the argument /dev/da0s4,
 I have done fsck in single user mode (the 160GB hard boots a character
based shell, but crashes
and reboots during "startx") and always the fsck looks the same.  My
configuration of the 160GB
is a little goofy, in my estimation, just to explain.  I currently have
three hard drives representing
all the times I have installed FreeBSD, two of them are dual booted with MS
Vista, and this latest
one with 160GB has FreeBSD all to itself, but when I was creating it, I
mistook partitions for
slices so I configured 4 partitions, leaving some of the disk unallocated
thinking that would be
good for that 10% utilization thing.  I mount  three partitions on /, /var,
and /usr; respectively
and the last one as swap.  I learned the vi editor in 1985 and tend to
recount the flavor of
unix as "evax" but at this point I wonder if this "evax" concept is
mistaken.  I have done a bunch
of c programming in university courses, but also spent some time doing
molecular biology but
they had me on a SUN SPARCstation I guess.  Didn't mess with that source
code.

Anyway.  Sorry for not being concise. I thought maybe my background might be
useful information.
I was told to do another diagnostic, alleged to pin the disk down as having
no bad sectors:

# dd if=/dev/da0 bs=65536 of=/dev/null
2442045+1 records in
2442045+1 records out
160041885696 bytes transferred in 5718.122211 secs (27988539 bytes/sec)
# echo $?
0
#

I was told that the fact that it returns 0 was good.


I also tried the port called recoverdisk, but that was taking extremely
long.  I accidently disconnected the
USB port

# /usr/src/tools/tools/recoverdisk
zsh: permission denied: /usr/src/tools/tools/recoverdisk
# set -o vi
# ls /usr/src/tools/tools/recoverdisk
Makefile        recoverdisk.1   recoverdisk.c
# cd /usr/src/tools/tools/recoverdisk
# make
Warning: Object directory not changed from original
/usr/src/tools/tools/recoverdisk
cc -O2 -fno-strict-aliasing -pipe  -Wsystem-headers -Werror -Wall
-Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual
-Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter
-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls -c
recoverdisk.c
cc -O2 -fno-strict-aliasing -pipe  -Wsystem-headers -Werror -Wall
-Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual
-Wwrite-strings -Wswitch -Wshadow -Wcast-align -Wunused-parameter
-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls  -o
recoverdisk recoverdisk.o
gzip -cn recoverdisk.1 > recoverdisk.1.gz
# ls
Makefile                recoverdisk.1           recoverdisk.c
recoverdisk             recoverdisk.1.gz        recoverdisk.o
# ./recoverdisk
usage: recoverdisk [-r worklist] [-w worklist] source-drive [destination]
# ./recoverdisk /dev/da0s4
        start    size           len state          done     remaining    %
done
    590348288 1048576  134551002112     0     590348288  134551002112
0.0043684

It had run for perhaps half an hour and still was only 0.3% done or so.


finally, the guy downstairs told me to debug the kernel so I found this
page:

http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug-gdb.html

and after mounting the /usr partition I am here:

-rw-r--r--  1 root  wheel     21360 Jun 22 10:30 yarrow.o
# kgdb /mnt/nexstar/obj/usr/src/sys/KV_KERN/kernel.debug vmcore.12
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so:
Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd".

Unread portion of the kernel message buffer:
dev = ad0s4d, block = 1, fs = /usr
panic: ffs_blkfree: freeing free block
cpuid = 0
Uptime: 8m2s
Physical memory: 1010 MB
Dumping 78 MB: 63 47 31 15

#0  0x00000000 in ?? ()
(kgdb)

::sigh::



I  was figuring I would try again, but right now I am running the
intermediary (120GB) HD..
let me reacquaint you with my disks:

  relative age          capacity        dual boot?        partition 1
        partition 2                   notes
    oldest                  60GB               yes               FreeBSD 6.2
             Vista                   makes the

gnome (operational)      (broken)               clunking noises

   intermediate         120GB             yes                Vista
           FreeBSD (6.3?)

 (running now)            (broken)

    newest                160GB             no               FreeBSD 7.0
           n/a                     subject of this
                                                                         KDE
(won't start)                                         question



   - Accept and Award
Points<http://www.experts-exchange.com/Storage/Hard_Drives/splitPoints.jsp?qid=23798083&aid=22692235>