Kernel-Crash when working with ubt0

[Lizbeth Mutterhunt, Ph.D.]

On Monday, 26 August 2019 23:35:25 CEST maksim yevmenkin wrote:
> > On Aug 26, 2019, at 9:14 AM, Warner Losh <imp at bsdimp.com> wrote:
> > 
> > Is it from read_connection_list? If so I have a 'patch' that I'm using but
> > haven't committed because it's just too gross: drop the lock before the
> > copyout and pick it up again after...
> 
> Hmm... interesting....
> 
> I only took a brief look at it. I suppose I can ensure user space address is
> wired and then copyout() can be called with mutex held
> 
> It’s odd that I’ve never seen this before. I’m traveling at the moment will
> take a closer look this later this week
> 
> Thanks
> Max

Sorry for late reply, suffering on a "VPN-Jetlag". 

Here's the promised vmcore.o(last)[1] on pastepin. It's not a "mini"-dump at all but a huge 
skirt up to the heals :-) as it has 360M of text and the editor loads about ten minutes on 
grandmother's laptop with her 70 years after 36 hours of being online. The options are 
with DEBUG=-g and VERBOSE set in the config. 

With the ubt1, a 2070X stack by Asus it's probably the kernel driver I'd have to parse into 
the kernel as here at linux a quarrel about it is for years systematically delaunching "bills 
driver"; you get the patch as a .zip file on Arch, not as a .deb or .tar.gz or whatever and it 
must be compiled by hand; after that you'd to reboot and install the A2DP-fix and than you 
can pray (where ever you want to and think it might help you) with the initial pulseaudio-
connect at boottime (sometimes it just doesn't recognize the adapter) - so as a LiLo-
substitute I prefer EFI-Clover not the GRUB-stuff that doesn't work at all for BSD for many, 
many times) and I really don't know how many hours I spent with "sudo bluetoothctl" and 
on kernel builts for this 'Ubitek Magic Box'.  

Hope someone can think it over, I know it's old hardware but she'd (the laptop) to to spend 
50 mankind-years in bills slavery when I got her finally - probably one of the SALVAGED - 
messages at fsck -y in single mode :-)

So take care of it, it's not the way I normally act to sent guys boxing about and for the box 
but much more than beeing dead can't happen, can it? - This happened to my cat "Rambo" 
who just flew away from me and went straight away under a car - buhuhuhu.... so far for 
the revenge thoughts, 

'svn up' is good at this, subversion is much better than git --diff, which really doens't work 
at all here. 

Yours, 
Miranda

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[1] pastebin.com/SB0HWHyz