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

[Carlos Carvalho]

Dan Moulding (dan@xxxxxxxx) 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.