can not umount cifs share

[Sebastian Lemmen]

Hello, I can not umount a cifs share with umount /media/share.

I alwas have to use umount -f -l /media/share.

We have round about 260 installations with Automatic software distribution which need to unmount the share or it get stuck.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-154-generic 5.4.0-154.171
ProcVersionSignature: Ubuntu 5.4.0-154.171-generic 5.4.240
Uname: Linux 5.4.0-154-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Jul 7 10:50 seq
 crw-rw---- 1 root audio 116, 33 Jul 7 10:50 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu27.27
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: pass
CloudArchitecture: x86_64
CloudID: none
CloudName: none
CloudPlatform: none
CloudSubPlatform: config
Date: Fri Jul 7 10:57:48 2023
InstallationDate: Installed on 2021-12-15 (569 days ago)
InstallationMedia: Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20210824)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t:

Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
MachineType: VMware, Inc. VMware Virtual Platform
PciMultimedia:

ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-154-generic root=/dev/mapper/vg0--ubuntu-lv0--system ro maybe-ubiquity
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-154-generic N/A
 linux-backports-modules-5.4.0-154-generic N/A
 linux-firmware 1.187.39
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/12/2020
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd11/12/2020:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.