linux-kernel - REGRESSION 5.19-rc1: virtio: harden vring IRQ

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Date:   Thu, 9 Jun 2022 00:55:48 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Marc Zyngier <maz@...nel.org>,
        Halil Pasic <pasic@...ux.ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        horsten Leemhuis <regressions@...mhuis.info>
Subject: REGRESSION 5.19-rc1: virtio: harden vring IRQ

I can no longer boot v5.19-rc1 on a Google Compute Engine VM.  This
bisected to commit 8b4ec69d7e09 ("virtio: harden vring IRQ").  Its
parent commit, be83f04d2529 ("virtio: allow to unbreak virtqueue")
does successfully boot, so it appears to be caused by commit
8b4ec69d7e09.

I've attached the console log and the config file which I used (which
was generated by using "kvm-xfstests install-kconfig"[1] which is
essentially a "make olddefconfig" of [2]

[1] https://github.com/tytso/xfstests-bld/blob/master/kernel-build/install-kconfig
[2] https://github.com/tytso/xfstests-bld/blob/master/kernel-build/kernel-configs/x86_64-config-5.15

Unfortunately, commit 8b4ec69d7e09 doesn't revert cleanly against
v5.19-rc1, but I can look into figure out how to do revert it if
necessary.

Is this a known issue?

Thanks,

						- Ted


View attachment "console-fail" of type "text/plain" (25200 bytes)

Download attachment "config.gz" of type "application/gzip" (18967 bytes)