linux-kernel - Re: mtdchar kernel oops

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Date:	Mon, 16 Apr 2012 14:37:06 +0200 (CEST)
From:	Joel Reardon <joel@...mbassador.com>
To:	Al Viro <viro@...IV.linux.org.uk>
cc:	Artem Bityutskiy <dedekind1@...il.com>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: mtdchar kernel oops

The troubled asm pair corresponds to this line:
this_cpu_add(mnt->mnt_pcp->mnt_count, n) in  the inline mnt_add_count().
So I suppose that perhaps either mnt is bad, or mnt_pcp is bad.

I'm using nandsim to simulate the mtd device. Steps are simple, load the
modules:
nand_ecc nand nand_ids mtd  mtd_blkdevs mtdblock mtdchar
nandsim first_id_byte=0x20 second_id_byte=0xa5 third_id_byte=0x00 fourth_id_byte=0x15 parts=0xa40 rptwear=1000

then `ubiformat /dev/mtd0` does the oops.

>
> Could you add printk into mtdchar_open(), dumping mnt and count values
> right after simple_pin_fs() call?
>

It oopses before it returns from the simple_pin_fs call, so that won't be
possible...

Cheers,
Joel
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