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Date:	Fri, 19 Nov 2010 16:02:56 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 23232] kernel hang on insert ext4 usb key

https://bugzilla.kernel.org/show_bug.cgi?id=23232





--- Comment #9 from Theodore Tso <tytso@....edu>  2010-11-19 16:02:53 ---
I'm not convinced we even got into the ext4_fill_super(); if we did there
should have been at least some ext4 printk's.   The OOPS is in
vfs_kern_mount().

I've looked through ext4_fill_super(), and if vfs_kern_mount() had gotten as
far as calling into ext4_fill_super(), I can't find any code path other than
failing the first two memory allocations that wouldn't have resulted in some
kind of kernel printk --- which wasn't in the oops display.

So I strongly suspect the failure was before vfs_kern_mount() calling
ext4_mount(), or in mount_bdev() --- since all ext4_mount() does is call
mount_bdev() passing in ext4_fill_super as a callback function.

Can the oops be replicated at this point?   If so, we can try instrumenting the
kernel, but this strongly smells like a hardware problem and a failure in the
generic code before we drop into the ext4 mount code in ext4_fill_super().

-- Ted

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