[Bug 1964426] [NEW] Wrong path reported in /proc/self/maps with overlayfs

[Luis Héctor Chávez]

Public bug reported:

When a program is running in an overlayfs, /proc/self/maps reports the
wrong path. Notably, it lacks a prefix equal to the mountpoint of the
overlayfs. This only happens on linux-gcp-5.13, it does not reproduce on
non-gcp kernels.

Small repro:

cat > repro.sh <
 LANG=C.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed-gcp-5.13
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed-gcp-5.13 (Ubuntu)
 Importance: Undecided
 Status: New


** Tags: amd64 apport-bug focal uec-images

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https://bugs.launchpad.net/bugs/1964426

Title:
  Wrong path reported in /proc/self/maps with overlayfs

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[Bug 1347637] Re: arm-linux-gnueabihf-gcc 4.8.2 produces wrong code when optimizing a function-pointer tail call when calling from softfp to hard fp ABI

[Luis Héctor Chávez]

This seems to be related to tail call optimizations, since compiling
with -fno-optimize-sibling-calls makes the problem go away

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https://bugs.launchpad.net/bugs/1347637

Title:
  arm-linux-gnueabihf-gcc 4.8.2 produces wrong code when optimizing a
  function-pointer tail call when calling from softfp to hard fp ABI

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