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Date:   Mon, 14 Dec 2020 00:40:17 -0500
From:   Dave Jones <davej@codemonkey.org.uk>
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mike Snitzer <snitzer@redhat.com>
Subject: Re: Linux 5.10
Message-ID: <20201214054017.GA20381@codemonkey.org.uk>
Mail-Followup-To: Dave Jones <davej@codemonkey.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Mike Snitzer <snitzer@redhat.com>
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 <20201214053147.GA24093@codemonkey.org.uk>
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On Mon, Dec 14, 2020 at 12:31:47AM -0500, Dave Jones wrote:
 > On Sun, Dec 13, 2020 at 03:03:29PM -0800, Linus Torvalds wrote:
 >  > Ok, here it is - 5.10 is tagged and pushed out.
 >  > 
 >  > I pretty much always wish that the last week was even calmer than it
 >  > was, and that's true here too. There's a fair amount of fixes in here,
 >  > including a few last-minute reverts for things that didn't get fixed,
 >  > but nothing makes me go "we need another week".
 > 
 > ...
 > 
 >  > Mike Snitzer (1):
 >  >       md: change mddev 'chunk_sectors' from int to unsigned
 > 
 > Seems to be broken.  This breaks mounting my raid6 partition:
 > 
 > [   87.290698] attempt to access beyond end of device
 >                md0: rw=4096, want=13996467328, limit=6261202944
 > [   87.293371] attempt to access beyond end of device
 >                md0: rw=4096, want=13998564480, limit=6261202944
 > [   87.296045] BTRFS warning (device md0): couldn't read tree root
 > [   87.300056] BTRFS error (device md0): open_ctree failed
 > 
 > Reverting it goes back to the -rc7 behaviour where it mounts fine.

Another data point from the md setup in dmesg..

good:

[    4.614957] md/raid:md0: device sdd1 operational as raid disk 3
[    4.614960] md/raid:md0: device sda1 operational as raid disk 0
[    4.614962] md/raid:md0: device sdc1 operational as raid disk 2
[    4.614963] md/raid:md0: device sdf1 operational as raid disk 4
[    4.614964] md/raid:md0: device sdg1 operational as raid disk 1
[    4.615156] md/raid:md0: raid level 5 active with 5 out of 5 devices, algorithm 2
[    4.645563] md0: detected capacity change from 0 to 12001828929536


bad:

[    5.315036] md/raid:md0: device sda1 operational as raid disk 0
[    5.316220] md/raid:md0: device sdd1 operational as raid disk 3
[    5.317389] md/raid:md0: device sdc1 operational as raid disk 2
[    5.318613] md/raid:md0: device sdf1 operational as raid disk 4
[    5.319748] md/raid:md0: device sdg1 operational as raid disk 1
[    5.321155] md/raid:md0: raid level 5 active with 5 out of 5 devices, algorithm 2
[    5.370257] md0: detected capacity change from 0 to 3205735907328