Re: mbuff in 2.2.14 rtlinux-2.2

[Fred Proctor <frederick.proctor-at-nist.gov>]

Ray Henry wrote about mbuff hanging. He got this:

[root-at-localhost ray]# rmmod mbuff
rmmod: mbuff: Device or resource busy

I have seen this happen when a kernel module fails, like with a
divide-by-zero. It may be that mbuff is failing in the same way.

Does the mbuff code log anything to /var/log/messages, or the console?
Open a terminal and, as root, type "tail -f /var/log/messages". This
will show the last few lines of the log file, and the -f options forces
tail to keep waiting. As messages pop up, tail will print them.

If you're running X Windows, you can hit Alt-F1 and toggle the display
to the first text console. Alt-F7 brings you back to X. Some messages
pop up on the console log, and this lets you drop out of X for a minute
to view them.

If there are error messages that seem to come from mbuff, let us know
what they are. There may be some EMC code that steps off the end of the
memory assigned by mbuff, which may make mbuff hang.

--Fred