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Subjectkernel bug in jfs, kernel 2.4.21-pre3-ac4 + recent listfix
I seem to have encountered a jfs meets nfs kernel bug, unrelated to the 
recently fixed problems in 2.4.21-pre3-ac4.

A little background on what went on before this, as it seems quite relevant.

I was nfs sharing(kernel nfs) a jfs volume /data/old which is on an lvm
partition (lvm1, not lvm2).

I did an lvextend on the partition, and then tried to extend the jfs
partition, while it was nfs shared (though nothing was actively reading
or writing to it).
The mount -o remount,resize command failed to extend the volume (note
the first "jfs_extendfs: volume hasn't grown, returning") message below.
I then unmounted the volume from the machines that had it nfs mounted,
and un-nfs-exported it. I then tried to remount,resize again, and had
the same problem(note second message). I then unmounted the jfs
partition completely, and it failed to mount it, claiming incorrect
partition type, yadda yadda. Fsck.jfs was run, and didn't report any
problems, but after running it, I was now able to mount the partition
again, and resize it succesfully.

I then re-exported it, nfs-mounted it remotely, and tried to copy files
to it: kaboom...machine up, but BUG reported and access to filesystem hangs.

FWIW, volume was exported (rw,sync), and mounted
(rsize=8192,wsize=8192,hard,nolock,intr), the nolock because I had
earlier in the evening been having problems getting locks on nfs
exported jfs volumes.

Ahh...pushing the sanity envelope...always fun.

-Tupshin


Jan 20 02:41:23 testing kernel: jfs_extendfs: volume hasn't grown, returning
Jan 20 02:41:55 testing rpc.mountd: authenticated unmount request from
172.16.1.1:876 for /data/old (/data/old)
Jan 20 02:42:03 testing rpc.mountd: authenticated unmount request from
172.16.1.50:925 for /data/old (/data/old)
Jan 20 02:42:07 testing kernel: jfs_extendfs: volume hasn't grown, returning
Jan 20 02:43:11 testing rpc.mountd: Caught signal 15, un-registering and
exiting.
Jan 20 02:43:11 testing kernel: nfsd: last server has exited
Jan 20 02:43:11 testing kernel: nfsd: unexporting all filesystems
Jan 20 02:43:28 testing kernel: resize option for remount only
Jan 20 02:44:53 testing kernel: VFS: brelse: Trying to free free buffer
Jan 20 02:45:10 testing rpc.mountd: Caught signal 15, un-registering and
exiting.
Jan 20 02:45:10 testing kernel: nfsd: last server has exited
Jan 20 02:45:10 testing kernel: nfsd: unexporting all filesystems
Jan 20 02:45:20 testing rpc.mountd: authenticated mount request from
172.16.1.1:934 for /data/old (/data/old)
Jan 20 02:45:24 testing rpc.mountd: authenticated mount request from
172.16.1.50:926 for /data/old (/data/old)
Jan 20 02:47:16 testing kernel: assert(hint < mapSize)

Jan 20 02:47:16 testing kernel: kernel BUG at jfs_dmap.c:760!
Jan 20 02:47:16 testing kernel: invalid operand: 0000
Jan 20 02:47:16 testing kernel: CPU: 0
Jan 20 02:47:16 testing kernel: EIP: 0010:[dbAlloc+150/1312]
Tainted: PF
Jan 20 02:47:16 testing kernel: EFLAGS: 00013286
Jan 20 02:47:16 testing kernel: eax: 00000017 ebx: 0079ffff ecx:
c5c4e02c edx: f72c1f7c
Jan 20 02:47:16 testing kernel: esi: 00000000 edi: 00000000 ebp:
e29f57c0 esp: f2eedc58
Jan 20 02:47:16 testing kernel: ds: 0018 es: 0018 ss: 0018
Jan 20 02:47:16 testing kernel: Process nfsd (pid: 4243, stackpage=f2eed000)
Jan 20 02:47:16 testing kernel: Stack: c03504b1 c035069f 00000000
c0202680 ebce61b4 00000004 c01e78c0 00000000
Jan 20 02:47:16 testing kernel: 00000000 00000004 00000002
00000000 dd1f6000 f72c38c0 ebce6100 00000004
Jan 20 02:47:16 testing kernel: 00000000 007a0000 e0364000
00000000 e29f57c0 c01f3b6f ebce6100 0079ffff
Jan 20 02:47:16 testing kernel: Call Trace: [__get_metapage+640/752]
[jfs_readpage+0/32] [diNewExt+479/1632] [diAllocExt+190/640]
[diAllocAG+88/224]
Jan 20 02:47:16 testing kernel: Code: 0f 0b f8 02 94 06 35 c0 8b 44 24
30 8b 48 34 39 4c 24 28 0f
Using defaults from ksymoops -t elf32-i386 -a i386


>>ecx; c5c4e02c <_end+579aea8/3859eefc>
>>edx; f72c1f7c <_end+36e0edf8/3859eefc>
>>ebp; e29f57c0 <_end+2254263c/3859eefc>
>>esp; f2eedc58 <_end+32a3aad4/3859eefc>

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 0f 0b ud2a
Code; 00000002 Before first symbol
2: f8 clc
Code; 00000003 Before first symbol
3: 02 94 06 35 c0 8b 44 add 0x448bc035(%esi,%eax,1),%dl
Code; 0000000a Before first symbol
a: 24 30 and $0x30,%al
Code; 0000000c Before first symbol
c: 8b 48 34 mov 0x34(%eax),%ecx
Code; 0000000f Before first symbol
f: 39 4c 24 28 cmp %ecx,0x28(%esp,1)
Code; 00000013 Before first symbol
13: 0f 00 00 sldtl (%eax)

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