GNU bug report logs - #45827
[aarch64] GCC 4.9.4 stack deallocation bug

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Package: guix;

Reported by: Leo Famulari <leo <at> famulari.name>

Date: Tue, 12 Jan 2021 22:03:01 UTC

Severity: normal

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Report forwarded to bug-guix <at> gnu.org:
bug#45827; Package guix. (Tue, 12 Jan 2021 22:03:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Leo Famulari <leo <at> famulari.name>:
New bug report received and forwarded. Copy sent to bug-guix <at> gnu.org. (Tue, 12 Jan 2021 22:03:01 GMT) Full text and rfc822 format available.

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From: Leo Famulari <leo <at> famulari.name>
To: bug-guix <at> gnu.org
Subject: [aarch64] GCC 4.9.4 stack deallocation bug
Date: Tue, 12 Jan 2021 17:01:53 -0500

There was a bug in GCC 4.9.4 that could cause miscompilation, such that
the "compiler was freeing the function's stack frame prior to the end of
the function itself." [0]

The bug was observed to cause corruption of ext4 filesystems on the
aarch64 platform.

The upstream report is here:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63293

Apparently this was fixed in GCC 5, but never backported to the 4.9
series.

Should we fix it? We use GCC 4.9 to bootstrap the system in (gnu
packages commencement), and a handful of packages depend on it.

[0]
https://lwn.net/SubscriberLink/842122/40442a015222c028/
This bug report was last modified 4 years and 151 days ago.

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