linux-kernel - RE: Oops (probably) unmounting /oldroot/firmware/efi/efivars.

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Message-ID: <8aea350dd7714d0ab95e9b2fb7cd013d@AcuMS.aculab.com>
Date:   Tue, 24 Nov 2020 14:42:58 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Ard Biesheuvel' <ardb@...nel.org>
CC:     linux-efi <linux-efi@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        "matthew.garrett@...ula.com" <matthew.garrett@...ula.com>,
        "jk@...abs.org" <jk@...abs.org>
Subject: RE: Oops (probably) unmounting /oldroot/firmware/efi/efivars.

From: Ard Biesheuvel
> Sent: 24 November 2020 14:24
> 
> On Tue, 24 Nov 2020 at 15:22, David Laight <David.Laight@...lab.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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