On Tue, Nov 10, 2020 at 06:42:17PM -0500, Alberto Sentieri wrote: > 1) The current Ubuntu Kernel is 5.4.0-53. Do you want me to upgrade it to > 5.9, from kernel.org? Or is there a Ubuntu 5.9 package that I can use? It > would be easy to do it If there is a Ubuntu package with 5.9, which I would > install and, after the tests, uninstall. If you want to know what Ubuntu packages are available, you should ask on an Ubuntu mailing list instead of the linux-usb mailing list. > 2) Why do you believe that 5.9 would solve the problem? I am asking that > because I cannot change the production machine for a test if I cannot go > back to the original state. There is always a risk involved. We do not believe that 5.9 will solve the problem -- we have no reason to believe this -- but we could be wrong. In any case it is always best to test with the most up-to-date software available, and 5.9 is the version closest to what we are working on now. > 3) It is one single thread dealing with all 36 devices. Each device has its > own co-routine (not preemptive), but all co-routines are executed by a > unique thread. If everything runs within a single thread, how can adding a semaphore or mutex make any difference? > 4) By network console, do you mean ssh? It dies as well when it locks. The > screen is the regular GNOME3 screen and nothing can be seen there. Every > time it locks they send a picture, and I cannot see anything meaningful > there. I am thinking about disabling GNOME3, but I need their blessing for > that. See https://www.kernel.org/doc/Documentation/networking/netconsole.txt for instructions on netconsole. And when you use it for testing, be sure to set the console log level to a high value. Alan Stern
