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    SubjectRE: Oops (probably) unmounting /oldroot/firmware/efi/efivars.
    Date
    From: Ard Biesheuvel
    > Sent: 24 November 2020 14:24
    >
    > On Tue, 24 Nov 2020 at 15:22, David Laight <David.Laight@aculab.com> wrote:
    > >
    > > I've just updated to the head of Linus's tree (5.10-rc5) and got the following
    > > 'splat' during shutdown.
    > >
    > > Userspace is Ubuntu 20.04.

    Anyone from ubuntu know how to get the kernel stack traceback
    without setting up a serial console?
    It seems to be completely broken by running the graphical login
    on tty0.

    > >
    > > rc4 rebooted fine.
    > >
    > > I'll try to bisect - but it isn't quick.
    > >
    >
    > Surely caused by
    >
    > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/efivarfs?id=fe5186cf12e30
    > facfe261e9be6c7904a170bd822

    Yes, I'm building with that commented out.

    But the system has decided to do a full build.

    I suspect it might need inode->i_private = NULL;
    But that might lead to a NULL pointer deref elsewhere.

    David

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