FYI, I've quoted the "EOF" to avoid the heredocs from turning the "$?" into "0".
** Description changed: 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 <<EOF + cat << "EOF" > repro.sh #!/usr/bin/env bash mkdir -p /tmp/overlay mkdir -p /tmp/work mkdir -p /tmp/upper mkdir -p /tmp/lower mount -t overlay overlay /tmp/overlay -o lowerdir=/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/work cp $(which cat) /tmp/overlay /tmp/overlay/cat /proc/self/maps | grep '\/tmp\/overlay\/cat' if [ $? -ne 0 ]; then - echo 'Bug!' + echo 'Bug!' else - echo 'No bug!' + echo 'No bug!' fi umount /tmp/overlay EOF sudo bash repro.sh ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.13.0-1019-gcp 5.13.0-1019.23~20.04.1 ProcVersionSignature: Ubuntu 5.13.0-1019.23~20.04.1-gcp 5.13.19 Uname: Linux 5.13.0-1019-gcp x86_64 ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 CasperMD5CheckResult: skip Date: Thu Mar 10 01:49:37 2022 ProcEnviron: - TERM=alacritty - PATH=(custom, no user) - XDG_RUNTIME_DIR=<set> - LANG=C.UTF-8 - SHELL=/bin/bash + TERM=alacritty + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=C.UTF-8 + SHELL=/bin/bash SourcePackage: linux-signed-gcp-5.13 UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-signed-gcp-5.13 in Ubuntu. https://bugs.launchpad.net/bugs/1964426 Title: Wrong path reported in /proc/self/maps with overlayfs Status in linux-signed-gcp-5.13 package in Ubuntu: Confirmed Bug description: 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 << "EOF" > repro.sh #!/usr/bin/env bash mkdir -p /tmp/overlay mkdir -p /tmp/work mkdir -p /tmp/upper mkdir -p /tmp/lower mount -t overlay overlay /tmp/overlay -o lowerdir=/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/work cp $(which cat) /tmp/overlay /tmp/overlay/cat /proc/self/maps | grep '\/tmp\/overlay\/cat' if [ $? -ne 0 ]; then echo 'Bug!' else echo 'No bug!' fi umount /tmp/overlay EOF sudo bash repro.sh ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.13.0-1019-gcp 5.13.0-1019.23~20.04.1 ProcVersionSignature: Ubuntu 5.13.0-1019.23~20.04.1-gcp 5.13.19 Uname: Linux 5.13.0-1019-gcp x86_64 ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 CasperMD5CheckResult: skip Date: Thu Mar 10 01:49:37 2022 ProcEnviron: TERM=alacritty PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=C.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed-gcp-5.13 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-gcp-5.13/+bug/1964426/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
