unmount oops in log_do_checkpoint

[Nick Piggin]

2.6.15-git12 (and 11, not sure when it started) oops when unmounting
an ext3 filesystem. Looks like 'transaction' in log_do_checkpoint is
garbage.

Reproduced it every time for about 3 or 4 reboots now.

Unable to handle kernel paging request at virtual address f63b4f7c
 printing eip:
c019db03
*pde = 004b0067
*pte = 363b4000
Oops: 0000 [#1]
SMP DEBUG_PAGEALLOC
Modules linked in: ide_cd cdrom 8250_pnp 8250 serial_core piix ide_core
CPU:    1
EIP:    0060:[<c019db03>]    Not tainted VLI
EFLAGS: 00010206   (2.6.15-git12) 
EIP is at log_do_checkpoint+0x6b/0x47b
eax: f63b4f78   ebx: 00000001   ecx: 00000000   edx: 00015e0a
esi: f57b78cc   edi: f57e7e90   ebp: f57e7e6c   esp: f57e7d38
ds: 007b   es: 007b   ss: 0068
Process umount (pid: 2418, threadinfo=f57e7000 task=f5396ad0)
Stack: <0>00000001 c18364b8 00000082 c04aa3a8 348ea000 f642bf24 f642bdf8 f63b4f78 
       00015e0a 00000001 c1836490 00000000 f57e7d80 c0114e96 00000000 00000000 
       f57e7d98 f4e7bad0 f57e7d98 c01151a0 c0441788 0000001f 00000000 c0441780 
Call Trace:
 [<c0103dc0>] show_stack_log_lvl+0xbb/0x105
 [<c0103f69>] show_registers+0x15f/0x1ef
 [<c010422a>] die+0x11b/0x22d
 [<c0114217>] do_page_fault+0x1ea/0x5d4
 [<c01037d7>] error_code+0x4f/0x54
 [<c019ff19>] journal_destroy+0x10d/0x24b
 [<c0195986>] ext3_put_super+0x20/0x1ec
 [<c015c89d>] generic_shutdown_super+0x89/0x131
 [<c015c954>] kill_block_super+0xf/0x20
 [<c015cb60>] deactivate_super+0x62/0x75
 [<c016f59c>] mntput_no_expire+0x44/0x62
 [<c0162f85>] path_release_on_umount+0x15/0x18
 [<c0170362>] sys_umount+0x3a/0x21d
 [<c017055e>] sys_oldumount+0x19/0x1b
 [<c0102bdf>] sysenter_past_esp+0x54/0x75
Code: e8 fe ff ff 89 d0 85 d2 0f 84 f2 01 00 00 8b 52 04 89 95 ec fe ff ff 39 85 e8 fe ff ff 74 15 8b 95 ec fe ff ff 8b 85 e8 fe ff ff <3b> 50 04 0f 85 cc 01 00 00 c7 45 f0 00 00 00 00 8b 85 e8 fe ff 

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