Linux sandbox rejects host mounts

“The Codex VS Code extension cannot execute any sandboxed command.”

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Fading. No reports and thumbs-up in the last 7 days and 1 the week before, down from 91 a week at the late-September peak.

Every sandboxed command and apply_patch fail with "error building bubblewrap command: mountinfo path is not absolute" when nsfs mounts from Docker or Snap are present
On WSL2 with WSLg, the sandbox reports "app-server socket directory has an unsupported host mount at /mnt/wslg/distro"
Under nix-user-chroot or on HPC nodes with an overmounted /tmp, bwrap fails with "Can't mkdir parents ... codex-daemon: Read-only file system" or an unsupported host mount error
On Btrfs subvolume layouts, setup fails with "cannot establish app-server socket mount isolation"
Appears after updating the desktop app, VS Code extension or CLI; codex sandbox /bin/true reproduces it

Sandbox panic with ENOTDIR when a permission profile grants write access to individual files
Commands that fail inside the sandbox after it has started

Oct 27, 2026Linux sandbox: covered mount aliases still passed to Bubblewrap in 0.164.0 and current main (#47455 regression)On GitHub#57520
Sep 30, 2026Linux: sandbox fails with “mountinfo path is not absolute”On GitHub#49732
Sep 28, 2026Title: Linux sandbox fails with Docker nsfs mounts: "mountinfo path is not absolute"On GitHub#48987
Sep 28, 2026VS Code extension in Ubuntu WSL2 fails to start bubblewrap sandboxOn GitHub#48976
Sep 27, 2026Bug: Bubblewrap sandbox fails on HPC with overmounted /tmpOn GitHub#48758
Sep 25, 2026Problems after todays outage, VSCode/Codex can't do anythingOn GitHub#48329
Sep 25, 2026WSL2 sandbox rejects standard Snap nsfs and /mnt/wslg/distro mountsOn GitHub#48061
Sep 25, 2026WSL2 sandbox fails to start: unsupported host mount at /mnt/wslg/distroOn GitHub#48053
Sep 24, 2026Linux sandbox fails on Docker nsfs mount with “mountinfo path is not absolute” in extension 26.917.62051On GitHub#47987
Sep 24, 2026Sandbox fails on WSL2 with WSLg: "app-server socket directory has an unsupported host mount at /mnt/wslg/distro"On GitHub#47849

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Sep 24, 2026mountinfo path is not absolute when running commands in shell environmentOn GitHub#47766
Sep 23, 2026codex sandbox fails with cannot establish app-server socket mount isolation on Btrfs subvolume layoutOn GitHub#47708
Sep 23, 2026bubblewrap errorOn GitHub#47681
Sep 23, 2026VS Code agent sandbox fails before commands run: mountinfo path is not absoluteOn GitHub#47559
Sep 23, 2026WSL: Codex bubblewrap sandbox fails on nested /mnt/wslg/distro shared mountOn GitHub#47527
Sep 23, 2026WSL2 sandbox fails before command execution: unsupported host mount at /mnt/wslg/distroOn GitHub#47465
Sep 23, 2026Codex VS Code extension 26.917.61114 still fails with mountinfo path is not absolute on Linux with snapd nsfs mountsOn GitHub#47457
Sep 23, 2026Linux sandbox treats a fully overmounted mount as an app-server socket alias (breaks nix-user-chroot 2.x)On GitHub#47455
Sep 22, 2026[WSL2] codex sandbox fails because /mnt/wslg/distro is reported as an unsupported host mountOn GitHub#47429
Sep 22, 2026Linux/Btrfs: sandbox rejects app-server socket mount when fstat device differs from mountinfoOn GitHub#47415
Sep 22, 2026Ubunthu ErrorOn GitHub#47368
Sep 22, 2026Bug: Linux sandbox fails with mountinfo path is not absolute after ChatGPT updateOn GitHub#47345
Sep 17, 2026Linux sandbox rejects valid nsfs mount roots from snapd: mountinfo path is not absoluteOn GitHub#46110