replace-kernel: unmounting fails

[xypron]

xorriso : UPDATE :  88.01% done
ISO image produced: 1033350 sectors
Written to medium : 1033350 sectors at LBA 0
Writing to 'stdio:new.iso' completed successfully.

mount: (hint) your fstab has been modified, but systemd still uses
       the old version; use 'systemctl daemon-reload' to reload.
mount: (hint) your fstab has been modified, but systemd still uses
       the old version; use 'systemctl daemon-reload' to reload.
umount: /tmp/tmpx8_mo_oq/.tmp/tmph5ya1u24: target is busy.
Traceback (most recent call last):
  File "/usr/local/bin/livefs-edit", line 8, in <module>
    sys.exit(__main__.main())
  File "/usr/local/lib/python3.10/dist-packages/livefs_edit/__main__.py", line 80, in main
    ctxt.teardown()
  File "/usr/local/lib/python3.10/dist-packages/livefs_edit/context.py", line 218, in teardown
    run(['umount', '-R', mount])
  File "/usr/local/lib/python3.10/dist-packages/livefs_edit/__init__.py", line 7, in run
    return subprocess.run(cmd, check=check, **kw)
  File "/usr/lib/python3.10/subprocess.py", line 526, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['umount', '-R', '/tmp/tmpx8_mo_oq/.tmp/tmph5ya1u24']' returned non-zero exit status 32.
make[1]: *** [Makefile:29: new] Error 1

The following mounts exist at this time

/dev/loop12p1 on /tmp/tmpx8_mo_oq/old/iso type iso9660 (ro,relatime,nojoliet,check=s,map=n,blocksize=2048,iocharset=utf8)
overlay on /tmp/tmpx8_mo_oq/new/iso type overlay (rw,relatime,lowerdir=/tmp/tmpx8_mo_oq/old/iso,upperdir=/tmp/tmpx8_mo_oq/.tmp/tmpeu8y9ths,workdir=/tmp/tmpx8_mo_oq/.tmp/tmpm5_55sf2,xino=off)
overlay on /tmp/tmpx8_mo_oq/new/initrd type overlay (rw,relatime,lowerdir=/tmp/tmpx8_mo_oq/old/initrd,upperdir=/tmp/tmpx8_mo_oq/.tmp/tmp9mwbz4ni,workdir=/tmp/tmpx8_mo_oq/.tmp/tmpi8zt3e2z)
/tmp/tmpx8_mo_oq/old/iso/casper/ubuntu-server-minimal.squashfs on /tmp/tmpx8_mo_oq/old/ubuntu-server-minimal type squashfs (ro,relatime,errors=continue)
overlay on /tmp/tmpx8_mo_oq/new/ubuntu-server-minimal type overlay (rw,relatime,lowerdir=/tmp/tmpx8_mo_oq/old/ubuntu-server-minimal,upperdir=/tmp/tmpx8_mo_oq/.tmp/tmpj65ygrpa,workdir=/tmp/tmpx8_mo_oq/.tmp/tmp7nyrdp5a,xino=off)
/tmp/tmpx8_mo_oq/old/iso/casper/ubuntu-server-minimal.ubuntu-server.squashfs on /tmp/tmpx8_mo_oq/old/ubuntu-server-minimal.ubuntu-server type squashfs (ro,relatime,errors=continue)
/tmp/tmpx8_mo_oq/old/iso/casper/ubuntu-server-minimal.ubuntu-server.installer.squashfs on /tmp/tmpx8_mo_oq/old/ubuntu-server-minimal.ubuntu-server.installer type squashfs (ro,relatime,errors=continue)
/tmp/tmpx8_mo_oq/old/iso/casper/ubuntu-server-minimal.ubuntu-server.installer.generic.squashfs on /tmp/tmpx8_mo_oq/old/ubuntu-server-minimal.ubuntu-server.installer.generic type squashfs (ro,relatime,errors=continue)
overlay on /tmp/tmpx8_mo_oq/.tmp/tmph5ya1u24 type overlay (rw,relatime,lowerdir=/tmp/tmpx8_mo_oq/old/ubuntu-server-minimal.ubuntu-server.installer:/tmp/tmpx8_mo_oq/old/ubuntu-server-minimal.ubuntu-server:/tmp/tmpx8_mo_oq/new/ubuntu-server-minimal,upperdir=/tmp/tmpx8_mo_oq/.tmp/tmpxb6sqsqd,workdir=/tmp/tmpx8_mo_oq/.tmp/tmpmkgap73e,xino=off)

[mwhudson]

Out of curiosity which kernel are you running here?

[xypron]

The kernel I need to install is linux-laptop from ppa:juergh/linux. My laptop is running the same kernel.

[mwhudson]

Ah sorry I meant on your system (I'm half wondering if this unmount failure is a kernel bug)

[xypron]

As said on my system I use the same kernel.

[xypron]

The same problem occurs on an arm64 system running Lunar with 5.19.0-21-generic.

lsof shows this process relating to one of the mounts:

gpg-agent 14794                             root    3u     unix 0xffff14b5cf5adc00      0t0     101556 /tmp/tmp1gt0b9_6/.tmp/tmpz2qgvhxl/S.gpg-agent type=STREAM (LISTEN)
gpg-agent 14794                             root    4u     unix 0xffff14b5cf5ac000      0t0     101557 /tmp/tmp1gt0b9_6/.tmp/tmpz2qgvhxl/S.gpg-agent.extra type=STREAM (LISTEN)
gpg-agent 14794                             root    5u     unix 0xffff14b5cf5ad000      0t0     101558 /tmp/tmp1gt0b9_6/.tmp/tmpz2qgvhxl/S.gpg-agent.browser type=STREAM (LISTEN)
gpg-agent 14794                             root    6u     unix 0xffff14b5cf5acc00      0t0     101559 /tmp/tmp1gt0b9_6/.tmp/tmpz2qgvhxl/S.gpg-agent.ssh type=STREAM (LISTEN)

root       14794  0.0  0.0  80940  2860 ?        Ss   17:26   0:00 gpg-agent --homedir /tmp/tmp1gt0b9_6/.tmp/tmpz2qgvhxl --use-standard-socket --daemon

[xypron]

update.yaml with these lines is enough to reproduce the problem:

---
- name: add-apt-repository
  repo: 'ppa:juergh/linux'
- name: replace-kernel
  flavor: 'laptop'

sudo livefs-edit lunar-live-server-arm64.iso new.iso --action-yaml update.yaml

[mwhudson]

Oh right I see the gpg's hanging around too (I could reproduce the problem). Not sure why my lsof-ing didn't find them though...