Arch Linux

Description:


The /dev/vcs* devices appear to error out after a short time of being accessed. The expected contents appears, but is gone so quickly, it is impossible to copy it and it is replaced by no such device error.


Additional info:
* package version(s)
It is present in linux-lts 5.15.94-1 but others have tested it in latest kernel too. Please note that I only suspect it's a kernel problem and can't be sure.

* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:

[root@mjollnir ~]# cat /dev/vcs

cat: /dev/vcs: No such device or address


[root@mjollnir ~]# cat /dev/vcsa1

cat: /dev/vcsa1: No such device or address

The same behavior happens with /dev/vcsu*. Here is another example to reproduce using python:

[root@mjollnir ~]# python
Python 3.10.9 (main, Dec 19 2022, 17:35:49) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> useVCSU = os.access('/dev/vcsu', os.R_OK)
>>> print(useVCSU)
True
>>> vcsu= open("/dev/vcsu",'rb')
>>> d = vcsu.read()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
OSError: [Errno 6] No such device or address
>>>