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Re: NetBSD 7.1.1 instability - hangs

Hi Robert,

I did some tests.

On 2018-03-10 00:01:27 +0000 Robert Elz <kre%munnari.OZ.AU@localhost> wrote:

  | X does not get "killed" either, I do not return to console.

If it gets killed, that (not returning to console) is expected.

  | On this system usually the X driver is decently well-behaved,
That I believe takes assistance from the X server.

  | so while things work I can switch to terminals,

Yes, the working server helps with the transition.

| if X was being killed by | out-of-swap, I'd expect to get to the console again.

I wouldn't.   But you can easily test that - just start X
(no need for anything huge like ruse - the "by out of
swap" is not important for this test)  and kill -9 the
X server process.   Observe what happens.   You might
want to make sure you can ssh in (or have already done
that) so you can gracefully reboot.

I tried by telneting into the box and
1) killed with normal signal: recovery is perfect
2) killed with -9 as you suggested: recovery is almost perfect: I get back to console (framebuffer, actually) although only with a cursoer. I am on a wrong terminal, switching console gives me back to the original prompt.

I'd say that is quite fine.

Of course, this does not mean that this is what is happening
in the situation in question, it could also be dropping to DDB
and hanging (because the console is still in X mode) as you
indicated you think is happening.

Maybe that is the cause then, with ddb perhaps there is no real "kill" and the situation can be explained.

That one can be tested by disabling ddb.onpanic
	( sysctl -w ddb.onpanic=0 )
and doing the rust build again - if the kernel crashes, it
will simply crash and reboot now.

Or you could do the rust build from a wscons console,
and not run X at all, and see what happens then, if it
is dropping into DDB, you should see it happen, and be
able to interact.

I did build rust by not runnign anything else, just left the ThinkPad there compiling.
rustc takes a tooooo long time (I hate it, but that is another story).
I checked from time to time memory usage and the process stayed from 300MB up to 1.2GB... but no swap usage. th machine ghas 1.5GB of RAM


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