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

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Message-ID: <20210107133747.GP1551@shell.armlinux.org.uk>
Date:   Thu, 7 Jan 2021 13:37:47 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Arnd Bergmann <arnd@...nel.org>
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 07, 2021 at 02:16:25PM +0100, Arnd Bergmann wrote:
> 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.

So, do we raise the minimum gcc version for the kernel as a whole to 5.1
or just for aarch64?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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