linux-kernel - Re: [next] WARNING: CPU: 2 PID: 66 at kernel/locking/rwsem.c:1298 __up

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Message-ID: <CADYN=9KeKhZ-OSbx1QHKYfXu+p-nXVjubbay1sXd_g75LLSZRg@mail.gmail.com>
Date:   Thu, 2 Dec 2021 13:28:46 +0100
From:   Anders Roxell <anders.roxell@...aro.org>
To:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        sean@...nix.com, Miquel Raynal <miquel.raynal@...tlin.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-mtd@...ts.infradead.org,
        open list <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        linux-block <linux-block@...r.kernel.org>
Subject: Re: [next] WARNING: CPU: 2 PID: 66 at kernel/locking/rwsem.c:1298 __up_read

On Tue, 30 Nov 2021 at 18:01, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>
> [Please ignore this email if it is already reported]
>
> Regression found on qemu_arm64.
> Following kernel warnings reported on Linux next-20211130 while booting.

I bisected down to 1ebe2e5f9d68 ("block: remove GENHD_FL_EXT_DEVT")

and when I reverted 1ebe2e5f9d68 ("block: remove GENHD_FL_EXT_DEVT") and the
3 releated patches so patch 1ebe2e5f9d68 was reverted cleanly I
managed to boot without
a warning.

Related patches from next-20211130:
9f18db572c97 ("block: don't set GENHD_FL_NO_PART for hidden gendisks")
430cc5d3ab4d ("block: cleanup the GENHD_FL_* definitions")
a4561f9fccc5 ("sr: set GENHD_FL_REMOVABLE earlier")

With this said, if I revert 9d6abd489e70 ("mtd: core: protect access
to MTD devices while in suspend")
I didn't see the warning either.

Any idea what can be wrong here or what a fix could be?

Only apply this patch from Geert
https://lore.kernel.org/lkml/c26dfdf9ce56e92d23530a09db386b283e62845d.1638289204.git.geert+renesas@glider.be/
makes the warning go away too.

Cheers,
Anders