[Bug]: Unmounting /tmp in guest during shutdown fails because VBoxDRMClient is still running

[Merga189]

Version

7.2.4

Host OS Type

Linux

Host OS name + version

DEBIAN 13

Host Architecture

x86

Guest OS Type

Linux

Guest Architecture

x86

Guest OS name + version

DEBIAN 13

Component

Other

What happened?

I do see this [FAILED] message (screenshot attached) now for some time, when shutting down the guest system. Not specifically with DEBIAN 13, but also with DEBIAN 12 and with different versions of VirtualBox ...

So I had a closer look. Did this testing in the guest system

user@debian:~$ sudo fuser -cu /tmp
[sudo] password for user: 
/tmp:                  984(root)  1007(root)  1051(user)  1142(user)
user@debian:~$ sudo ps -a 984
    PID TTY      STAT   TIME COMMAND
    984 ?        Sl     0:00 /usr/bin/VBoxDRMClient
   1460 pts/0    S+     0:00 sudo ps -a 984
   1463 pts/1    R+     0:00 ps -a 984
user@debian:~$ sudo ps -a 1007
    PID TTY      STAT   TIME COMMAND
   1007 tty7     Ssl+   0:00 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/li
   1464 pts/0    S+     0:00 sudo ps -a 1007
   1467 pts/1    R+     0:00 ps -a 1007
user@debian:~$ sudo ps -a 1051
    PID TTY      STAT   TIME COMMAND
   1051 ?        Ssl    0:00 xfce4-session
   1468 pts/0    S+     0:00 sudo ps -a 1051
   1471 pts/1    R+     0:00 ps -a 1051
user@debian:~$ sudo ps -a 1142
    PID TTY      STAT   TIME COMMAND
   1142 ?        Ss     0:00 /usr/bin/ssh-agent x-session-manager
   1472 pts/0    S+     0:00 sudo ps -a 1142
   1475 pts/1    R+     0:00 ps -a 1142
user@debian:~$ sudo kill 984
user@debian:~$ sudo fuser -cu /tmp
/tmp:                 1007(root)  1051(user)  1142(user)
user@debian:~$ 

Killing the 'VBoxDRMClient' before shutting down does the trick here, so I think, this is causing the message.

br Karl

How can we reproduce this?

DEBIAN host and guest. See that behavior on two different desktop machines here ....

um2910-stlinkv3minie-debuggerprogrammer-tiny-probe-for-stm32-microcontrollers-stmicroelectronics-1.pdf

Did you upload all of your necessary log files, screenshots, etc.?

• Yes, I've uploaded all pertinent files to this issue.

[galitsyn-oracle]

Hi Karl,

Does not seem related to VirtualBox. Unmount is likely failed because mount point is in use by some process.

[Merga189]

That was fast ;-)

The VBoxDRMClient running in the guest system is the problem. If I kill it before shutting down, no FAILED message in the guest system.

Karl

[galitsyn-oracle]

Hi Karl,

You are correct. Seems VBoxDRMClient is the reason. It keeps IPC socket open in /tmp. I will have a pick.

[Merga189]

Hi Vadim. Thank you for having a second look at it. ;-)

I know, this is a kind of 'bagatelle'. But I did not think, it is a Debian issue.

Karl

PS. Is it possible to add a subject to my report? Just #311 and then 'nothing'? Looks stupid. My fault.

[galitsyn-oracle]

Hi Karl,

Could you please give it a try to the latest "Development snapshots" from https://www.virtualbox.org/wiki/Testbuilds (only Guest Additions need to be updated).