[OpenWrt-Devel] Device tree issues with TL-WDR4900 (mpc85xx) and kernel 4.0.1
nbd at openwrt.org
Thu May 7 08:49:52 EDT 2015
On 2015-05-07 08:01, Wojciech Dubowik wrote:
> Try to boot with kernel locking enabled. I have seen jffs2 deadlocks on
> readdir. As far as I remember
> with this patch it went through but I don't know anymore whether I have
> changed sth in config.
> Have a look at (search engine...) [PATCH] fs: jffs2: Add setup code for
> spi nor flash.
> Even with this patch I got some possible dead lock warnings so it might
> be just a partial cure. BTW it's
> a bit scary for future use. Looks like jffs2 doesn't get enough care...
I believe the locking issues are an overlayfs regression, maybe even
the same one as this one (which I fixed years ago):
I believe this is the cause of the regression:
Author: Miklos Szeredi <mszeredi at suse.cz>
Date: Sat Dec 13 00:59:42 2014 +0100
ovl: check whiteout while reading directory
Don't make a separate pass for checking whiteouts, since we can do it while
reading the upper directory.
This will make it easier to handle multiple layers.
Signed-off-by: Miklos Szeredi <mszeredi at suse.cz>
It probably happens like this:
overlayfs does a readdir, in which jffs2 takes a lock.
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