id = 1033
title = "fakeroot under qemu fails with 'semop(1): encountered an error: Function not implemented'"
state = "opened"
created_at = "2022-05-23T01:09:03.763Z"
closed_at = "n/a"
labels = ["linux-user", "workflow::Needs Info"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/1033"
host-os = "xubuntu 20.04 (Focal)"
host-arch = "x86_64"
qemu-version = "version 7.0.50 (v7.0.0-1171-g3757b0d08b)"
guest-os = "raspberry pi os bullseye (raspbian)"
guest-arch = "armv7l"
description = """Appears to be the same issue as that discussed and reportedly fixed in https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=965109

Running raspberry pi os in a chroot (using schroot). Execution of fakeroot as part of dpkg-buildpackage results in:

```
dpkg-buildpackage: info: source package clementine
dpkg-buildpackage: info: source version 1.4.0rc1-836-g4665916ba~bullseye
dpkg-buildpackage: info: source distribution bullseye
dpkg-buildpackage: info: source changed by David Sansome <me@davidsansome.com>
dpkg-buildpackage: info: host architecture armhf
 dpkg-source --before-build .
 fakeroot debian/rules clean
semop(1): encountered an error: Function not implemented
dpkg-buildpackage: error: fakeroot debian/rules clean subprocess returned exit status 1
```

This is the same error as reported in bug 965109, but I'm running the most recent version of qemu - I built it from the git repo, so it should include the fix for 965109."""
reproduce = """1. Setup (s)chroot with arm architecture (although the architecture may not matter) 
2. Run fakeroot in the chroot
3. Observe the failure related to the semop syscall"""
additional = """- Not sure what other information I can provide to be helpful.
- The command line listed above is what I gather from ps; it's how qemu-arm-static is called by schroot. I've not been able to figure out _how_ schroot calls qemu-arm-static, I only know it does.
- I compiled qemu from source using my own user id, and ran into an issue with make install, so I manually used install to deploy the executable to /usr/local/bin... And then had to symlink that to /usr/bin as schroot apparently hardcodes the location of qemu-arm-static (at least it did not pick up the version I'd placed in /usr/local/bin)."""