[Bug 2031042] Re: Upgrade to 2.12~rc1-4ubuntu1 failed with "umount: /tmp/zfsmnt.5DJ7yi: target is busy."

[Julian Andres Klode]

It's not clear why they're in use, you may want to run fuser to find
out. But ultimately I guess that's a kernel bug that we can't do
anything about in grub.

The real bug in grub here is bug 2029260.

** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

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Title:
  Upgrade to 2.12~rc1-4ubuntu1 failed with "umount: /tmp/zfsmnt.5DJ7yi:
  target is busy."

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Tried to update my system today and got the error below. It's Mantic
  with the standard ZFS installation.

  Setting up linux-image-6.3.0-7-generic (6.3.0-7.7+1) ...
  Setting up grub-pc (2.12~rc1-4ubuntu1) ...
  Sourcing file `/etc/default/grub'
  Sourcing file `/etc/default/grub.d/init-select.cfg'
  Generating grub configuration file ...
  /etc/grub.d/10_linux_zfs: 425: version_find_latest: not found
  umount: /tmp/zfsmnt.5DJ7yi: target is busy.
  rmdir: failed to remove '/tmp/zfsmnt.5DJ7yi': Device or resource busy
  dpkg: error processing package grub-pc (--configure):
   installed grub-pc package post-installation script subprocess returned error exit status 1
  No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                            dpkg: dependency problems prevent configuration of grub-efi-amd64-signed:
   grub-efi-amd64-signed depends on grub-efi-amd64 | grub-pc; however:
    Package grub-efi-amd64 is not installed.
    Package grub-pc is not configured yet.

  dpkg: error processing package grub-efi-amd64-signed (--configure):
   dependency problems - leaving unconfigured
  Processing triggers for linux-image-6.3.0-7-generic (6.3.0-7.7+1) ...
  /etc/kernel/postinst.d/dkms:
   * dkms: running auto installation service for kernel 6.3.0-7-generic
   * dkms: autoinstall for kernel 6.3.0-7-generic
     ...done.
  /etc/kernel/postinst.d/initramfs-tools:
  update-initramfs: Generating /boot/initrd.img-6.3.0-7-generic
  W: Possible missing firmware /lib/firmware/amdgpu/ip_discovery.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/vega10_cap.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/sienna_cichlid_cap.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/navi12_cap.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/aldebaran_cap.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/gc_11_0_0_toc.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/sienna_cichlid_mes1.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/sienna_cichlid_mes.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/navi10_mes.bin for module amdgpu
  W: Possible missing firmware /lib/firmware/amdgpu/gc_11_0_3_mes.bin for module amdgpu
  /etc/kernel/postinst.d/zz-update-grub:
  Sourcing file `/etc/default/grub'
  Sourcing file `/etc/default/grub.d/init-select.cfg'
  Generating grub configuration file ...
  /etc/grub.d/10_linux_zfs: 425: version_find_latest: not found
  umount: /tmp/zfsmnt.ftFfAn: target is busy.
  rmdir: failed to remove '/tmp/zfsmnt.ftFfAn': Device or resource busy
  run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 1
  dpkg: error processing package linux-image-6.3.0-7-generic (--configure):
   installed linux-image-6.3.0-7-generic package post-installation script subprocess returned error exit status 1
  Errors were encountered while processing:
   grub-pc
   grub-efi-amd64-signed
   linux-image-6.3.0-7-generic
  E: Sub-process /usr/bin/dpkg returned an error code (1)


  
  In the end these mount points were left behind:

  rpool/ROOT/ubuntu_nedhsb on /tmp/zfsmnt.5DJ7yi type zfs (rw,noatime,xattr,posixacl,casesensitive)
  bpool/BOOT/ubuntu_nedhsb on /tmp/zfsmnt.5DJ7yi/boot type zfs (rw,nodev,noatime,xattr,posixacl,casesensitive)
  rpool/ROOT/ubuntu_nedhsb on /tmp/zfsmnt.ftFfAn type zfs (rw,noatime,xattr,posixacl,casesensitive)
  bpool/BOOT/ubuntu_nedhsb on /tmp/zfsmnt.ftFfAn/boot type zfs (rw,nodev,noatime,xattr,posixacl,casesensitive)

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