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Subject: Re: [question]MTD:unstable bit issues?
From: Artem Bityutskiy <dedekind1@gmail.com>
To: hejianet <hejianet@linux.vnet.ibm.com>
Date: Mon, 12 Nov 2012 17:39:59 +0200
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On Wed, 2012-10-24 at 17:21 +0800, hejianet wrote:
> Hi Thomas
> till now, we have no evidence that it is a jffs2.

> we only observed a ubi error msg(not 100% sure it caused this hole):
>=20
> Oct 15 20:09:10 (none) kernel: UBI error: ubi_io_write error -5 while wri=
ting 2048 bytes to PEB 1663:20480, written 0 bytes
>=20
> Besides, it only appeared in power-cut stress cut, so I suspect it is rel=
evant
> to "unstable bits issue". from google information, this issue appears in =
both
> nand and nor flash, but more frequently in nand.

Unstable bits issue does not give you tons of zeroes. I really think
that this is either a JFFS2 bug - fsync does not work, or your test
scripts have a bug - you power-cut before fsync or you do fsync, then
write more to this file, then power-cut.

--=20
Best Regards,
Artem Bityutskiy

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