Re: EXT4 ENOSPC Bug

[Andres Freund]

On 02/16/2009 08:00 PM, Theodore Tso wrote:
> On Mon, Feb 16, 2009 at 04:27:03PM +0100, Andres Freund wrote:
> > So, yes, seems to be an inode allocation problem.

> I'm pretty sure the ENOSPC problem which you both found is an inode
> allocation problem.  Some of you seem to have an easier time
> reproducing it than others; could you try this patch, and periodically
> scan your system logs for the message "ext4: find_group_flex failed,
> fallback succeeded"?  If the problem goes away for you, and you find
> the occasional aforemention message in your system log, that will
> confirm what I suspect, which is the bug is in fs/ext4/inode.c's
> find_group_flex() function.  (If I'm wrong, the fallback code will
> activate only when the filesystem is genuinely out of inodes, which
> should be very rare.)
>
> More comments are in the patch header.  My current long-term plan for
> dealing with this is to enhance find_group_orlov() to and
> find_group_other() to understand about flex_bg's.
Ok. I am now running with the patch enabled on two machines - but as the 
issue occured only 2 times in nearly 2 months on two machines...

Andres
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