Various Message Queue Errors

[HoloJosh]

Hi all,

So I can build the code and configure it no problem. I set up a library config with a "generic" drive and 4 tapes.

However when I start the library, only my medium changer is reported over lsscsi -g , my drive seemingly doesnt exist.

I then noticed that if I run vtllibrary -d I get the following log:

Drive 1
vtllibrary: main(): Vendor ID : "Holo"
vtllibrary: main(): Product ID : "Holo"
vtllibrary: main(): Revision Level: ""
vtllibrary: main(): Product S/No : "H010_01"
vtllibrary: main(): Drive location: 1
vtllibrary: main(): Drive occupied: Yes
mhvtl_driver_name: ERROR send_msg: msgsnd failed: Invalid argument
vtllibrary: main():

I obviously tried searching for "Invalid argument" throughout the project, but have seen no clear definition.

I additionally get the response "Message Queue Error: send message" when trying to use any of the vtlcmd commands to control the library.

I had similar issues before but restarting my device resolved it, however I have had no such luck this time around.

For clarity I am running Ubuntu 24.04.2 LTS on 6.11.0-17-generic kernel.

If you would like any additional info just ask and I will do my best to get it for you!

[markh794]

This type of error is typically due to permissions of the IPC message queue(s)

Stop mhVTL (or at least confirm they are not running).
Kill/cancel all IPC messages, shm for the 'mhVTL'

The 'key' for mhVTL is 0x4b61726b

While running the services:

[markh@alma9 usr]$ ipcs -a

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages    
0x4d61726b 0          root       660        0            0           

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      
0x4d61726b 2          root       666        16         0                       

------ Semaphore Arrays --------
key        semid      owner      perms      nsems     

With mhVTL stopped - there should not be any ipc resources for the key:

[markh@alma9 usr]$ sudo systemctl stop mhvtl.target
[markh@alma9 usr]$ ipcs -a

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages    

------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      

------ Semaphore Arrays --------
key        semid      owner      perms      nsems