linux-kernel - Re: [REGRESSION] 6.7.1: md: raid5 hang and unresponsive system; successfully bisected

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Message-ID: <ZbMnZnvyIyoWeIro@fisica.ufpr.br>
Date: Fri, 26 Jan 2024 00:30:46 -0300
From: Carlos Carvalho <carlos@...ica.ufpr.br>
To: Dan Moulding <dan@...m.net>
Cc: junxiao.bi@...cle.com, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	regressions@...ts.linux.dev, song@...nel.org,
	stable@...r.kernel.org, yukuai1@...weicloud.com
Subject: Re: [REGRESSION] 6.7.1: md: raid5 hang and unresponsive system;
 successfully bisected

Dan Moulding (dan@...m.net) wrote on Thu, Jan 25, 2024 at 05:31:30PM -03:
> I then created an ext4 file system on the "data" volume, mounted it, and used
> "dd" to copy 1MiB blocks from /dev/urandom to a file on the "data" file
> system, and just let it run. Eventually "dd" hangs and top shows that
> md0_raid5 is using 100% CPU.

It's known that ext4 has these symptoms with parity raid. To make sure it's a
raid problem you should try another filesystem or remount it with stripe=0.