On Tue, Feb 18, 2020 at 04:01:24PM +0100, Lukas Wunner wrote: > On Tue, Feb 18, 2020 at 02:18:40PM +0000, Nicholas Johnson wrote: > > If I surprise remove Thunderbolt 3 devices just as the kernel is > > shutting down, I get stack dumps, when those devices would not normally > > cause stack dumps if the kernel were not shutting down. > > > > Because the kernel is shutting down, it makes it difficult to capture > > the logs without a serial console. > > Hold a camera in front of the screen and try to capture the messages > as an MP4 movie which can be uploaded to YouTube or something. https://www.youtube.com/watch?v=sDcYmbz7GME The above is unlisted and will not appear in any search, so it will not confuse my subscribers, but anybody with the link can view it (public). I am still not sure I like the sound of my own voice. *cringe* > > If the output moves too fast to capture it, artificially slow it down > by adding a udelay() to call_console_drivers() in kernel/printk/printk.c. If you cannot get anything useful out of the aforementioned video, then I will do this tomorrow evening. It is almost 1am now. > > Thanks, > > Lukas By the way, this is not just with Linux v5.6-rcX. I have noticed this for some time but it has been lower down my list in terms of priority and urgency. I half expected it to be of no interest. I should have mentioned it earlier, but before I might not have had as much time to help investigate. I am currently looking for new kernel development tasks because my previous ones are done. Thanks, Nicholas
