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Re: easily reproducible filesystem crash on rebuilding array

To: xfs@xxxxxxxxxxx
Subject: Re: easily reproducible filesystem crash on rebuilding array
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Mon, 15 Dec 2014 13:25:00 +0100
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20141215130715.4dfaaa8e@xxxxxxxxxxxxxxxxxxxx>
Organization: Intellique
References: <20141211123936.1f3d713d@xxxxxxxxxxxxxxxxxxxx> <20141215130715.4dfaaa8e@xxxxxxxxxxxxxxxxxxxx>
Le Mon, 15 Dec 2014 13:07:15 +0100
Emmanuel Florac <eflorac@xxxxxxxxxxxxxx> Ãcrivait:

> Dec 12 00:40:18 TEST-ADAPTEC kernel: XFS (dm-0):
> xfs_do_force_shutdown(0x1) called from line 383 of file
> fs/xfs/xfs_trans_buf.c.  Return address = 0xffffffff8125cc90
> Dec 12 00:40:31 TEST-ADAPTEC kernel: XFS (dm-0): xfs_log_force: error
> 5 returned.
> Dec 12 00:41:02 TEST-ADAPTEC kernel: XFS (dm-0): xfs_log_force: error
> 5 returned.
> 

Reading the source I see that the error occured in xfs_buf_read_map, I
suppose it's when xfsbufd tries to scan dirty metadata? This is a read
error, so it could very well be a simple IO starvation at the controller
level (as the controller probably gives priority to whatever writes are
pending over reads).

Maybe setting xfsbufd_centisecs to the max could help here? Trying
right away... Any advice welcome.

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