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Subject2.4.23: BUG at inode.c:589! on ext3 during umount
Kernel 2.4.23-rc5 (which is 2.4.23) with slight non-fs related patches.
Running on Toshiba Satellite 2590CDT Notebook, Celeron 400 + 192 MB ram.
.config available on request.

On a system running for weeks after stopping almost all processes (5 or 6
left), unloading almost all modules (ipv6, binfmt_misc, ipchains
left), umounting almost all filesystems - remaining: tmpfs on /,
devfs on /dev, procfs on /proc, ext3(hda4) on /sysroot.

Running umount /sysroot results in umount segfaulting and the following
oops. The umount however succeeds - but the console umount was run on
cannot be dealloced (lsof shows no-one accessing it). e2fsck /dev/hda4
replayed the journal (nothing in it, but took _long_), and states the fs
is clean. mount /sysroot hangs (not because of fs errors, mounts fine
after reboot).

Furthermore devfs /dev/vcc/{1,11} (system console and console umount was
run on) no longer exist after dealloctvt {1,11} (which reports
failure, 1: system console, 11: in use) while Alt+F{1,11} can
still switch to these consoles and display their proper contents.

the bug happens @ fs/inode.c:

void clear_inode(struct inode *inode) {
if (inode->i_data.nrpages)
! BUG();



ksymoops 2.4.5 on i686 2.4.23-rc5-athena. Options used
-V (specified)
-k /proc/ksyms (specified)
-L (specified)
-o /lib/modules/2.4.23-rc5-athena/ (specified)
-m /boot/ (specified)

Warning (compare_maps): mismatch on symbol do_special , ksyms_base says c01ac090, says c019b750. Ignoring ksyms_base entry
Kernel BUG at inode.c:589!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c014f8da>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010202
eax: cbbc6060 ebx: cbbc6040 ecx: 3fe2d061 edx: cbbc6060
esi: cbbc6040 edi: c138bf58 ebp: 00000121 esp: c138bf20
ds: 0018 es: 0018 ss: 0018
Process umount (pid: 20000, stackpage=c138b000)
Stack: cbbc6040 cbbc6048 c014f9ed cbbc6040 00000000 00000000 cbf0fc64 00000001
c138bf58 bffffa88 c014fb7d c138bf58 cbf0fc00 c138bf58 cbbc6228 cbc24de8
cbf0fc00 cbf0fc44 c0247160 c013ff1a cbf0fc00 00000000 c138bf8c 0804df38
Call Trace: [<c014f9ed>] [<c014fb7d>] [<c013ff1a>] [<c01525cf>] [<c012a3a2>]
[<c0152635>] [<c0109075>]
Code: 0f 0b 4d 02 9d 07 22 c0 8b 83 08 01 00 00 a8 10 75 08 0f 06

>>EIP; c014f8da <clear_inode+1a/e0> <=====

>>eax; cbbc6060 <_end+b9037c8/c53f7c8>
>>ebx; cbbc6040 <_end+b9037a8/c53f7c8>
>>ecx; 3fe2d061 Before first symbol
>>edx; cbbc6060 <_end+b9037c8/c53f7c8>
>>esi; cbbc6040 <_end+b9037a8/c53f7c8>
>>edi; c138bf58 <_end+10c96c0/c53f7c8>
>>esp; c138bf20 <_end+10c9688/c53f7c8>

Trace; c014f9ed <dispose_list+4d/b0>
Trace; c014fb7d <invalidate_inodes+7d/90>
Trace; c013ff1a <kill_super+8a/110>
Trace; c01525cf <sys_umount+3f/90>
Trace; c012a3a2 <sys_munmap+42/70>
Trace; c0152635 <sys_oldumount+15/20>
Trace; c0109075 <ret+0/f>

Code; c014f8da <clear_inode+1a/e0>
00000000 <_EIP>:
Code; c014f8da <clear_inode+1a/e0> <=====
0: 0f 0b ud2a <=====
Code; c014f8dc <clear_inode+1c/e0>
2: 4d dec %ebp
Code; c014f8dd <clear_inode+1d/e0>
3: 02 9d 07 22 c0 8b add 0x8bc02207(%ebp),%bl
Code; c014f8e3 <clear_inode+23/e0>
9: 83 08 01 orl $0x1,(%eax)
Code; c014f8e6 <clear_inode+26/e0>
c: 00 00 add %al,(%eax)
Code; c014f8e8 <clear_inode+28/e0>
e: a8 10 test $0x10,%al
Code; c014f8ea <clear_inode+2a/e0>
10: 75 08 jne 1a <_EIP+0x1a>
Code; c014f8ec <clear_inode+2c/e0>
12: 0f 06 clts

1 warning issued. Results may not be reliable.


no idea why that single warning was issued - nothing was changed and
do_special is in the keyboard code if I'm not mistaken and isn't in any

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