linux-ext4 - Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues

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Message-ID: <CAK8P3a2TXPfFpgy+XjpDzOqt1qpDxufwiD-BLNbn4W_jpGp98g@mail.gmail.com>
Date:   Thu, 7 Jan 2021 14:16:25 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Will Deacon <will@...nel.org>, linux-toolchains@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        "Theodore Ts'o" <tytso@....edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory
 ordering issues

On Thu, Jan 7, 2021 at 1:47 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:

> Arnd has found via bisecting gcc:
>
> 7e8c2bd54af ("[AArch64] fix unsafe access to deallocated stack")
>
> which seems to be https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293
>
> That seems to suggest that gcc-5.0.0 is also affected.
>
> Looking at the changelog in Debian's gcc-8.3 packages, this doesn't
> feature, so it's not easy just to look at the changelogs to work out
> which versions are affected.

I checked the history to confirm that all gcc-5 releases (5.0.x is pre-release)
and later have the fix.

The gcc bugzilla mentions backports into gcc-linaro, but I do not see
them in my git history.

       Arnd