2 people reported
All time, since Sep 15.
Bash sandbox mount failure
“‘device_bash failed outright at session start: 'no Plan9 drive shares mounted under /mnt/.virtiofs-root/shared'’”
Is this your bug? What gets counted gets fixed. Pile on.
Paste this into your agent. It files your report, with your error and version.
I hit this bug: rapsheet.dev/sheets/claude-code/issues/17744/file Follow it to file my report. Show me the text before you send.
No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends
Bash sandbox fails to mount Plan9 drive shares on Windows. Every device_bash call fails at session start in Claude Desktop since 2026-09-08, so the shell does not run at all.
Is this your bug?
File my report- Where
- device_bash tool
- Error text
sandbox-helper: no Plan9 drive shares mounted under /mnt/.virtiofs-root/shared- Platforms
- Windows
- How bad
- Stops work: a core feature can't be used.