Re: [PATCH] deadlock when swapping to FAT

From: OGAWA Hirofumi
Date: Thu Mar 12 2009 - 12:05:32 EST


Mikulas Patocka <mpatocka@xxxxxxxxxx> writes:

> swapon will deadlock when an attempt to swap to a file on FAT filesystem
> is made. swapon holds i_mutex and FAT bmap is attempting to take it again.
>
> This bug was introduced somewhere between 2.6.27 and 2.6.28.
>
> No other filesystem is taking i_mutex in bmap, so I removed it as well.
>
> Note that there are many other cases where bmap can race with truncate in
> almost all the filesystems. They don't impose an immediate threat because
> bmap can be only called by root. These problems should be solved in a
> generic way, not in individual filesystems.

Thanks. This was fixed recently with a bit different way.
--
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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