[Bug 27652] 38-rc1: umount+rmmod cause ext4 error.

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https://bugzilla.kernel.org/show_bug.cgi?id=27652





--- Comment #8 from Tao Ma <tm@xxxxxx>  2011-01-30 02:36:58 ---
(In reply to comment #7)
> Patch: https://bugzilla.kernel.org/show_bug.cgi?id=27652#c6 
> 
> Tao Ma, does this work for you too?

Hi sorry for the delay.
So the patch works for the kernel panic.
Reported-and-Tested-by: Tao Ma <boyu.mt@xxxxxxxxxx>

As for the original bug, it doesn't help. I can still get the error message.

slab error in kmem_cache_destroy(): cache `ext4_inode_cache': Can't free all
objects
Pid: 4674, comm: rmmod Not tainted 2.6.38-rc2+ #1
Call Trace:
 [<ffffffff820d61ac>] ? kmem_cache_destroy+0x83/0xc7
 [<ffffffffa03a9000>] ? destroy_inodecache+0x15/0x17 [ext4]
 [<ffffffffa03c7264>] ? ext4_exit_fs+0x30/0x60 [ext4]
 [<ffffffff82067bce>] ? sys_delete_module+0x1b5/0x218
 [<ffffffff8207506f>] ? audit_syscall_entry+0x187/0x1ba
 [<ffffffff82002a6b>] ? system_call_fastpath+0x16/0x1b
SLAB: cache with size 888 has lost its name

And as I pointed in the original mail, I have done some basic investigation and
it looks as if it is introduced by Nick's new ext4_i_callback.

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