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xsrc/44712: wscons VT switching gets wedged
>Synopsis: wscons VT switching gets wedged
>Arrival-Date: Sat Mar 12 03:35:00 +0000 2011
>Originator: David A. Holland
>Release: NetBSD 5.99.41 (20101130)
System: NetBSD macaran 5.99.41 NetBSD 5.99.41 (MACARAN) #3: Tue Nov 30 21:52:01
EST 2010 dholland@macaran:/usr/src/sys/arch/amd64/compile/MACARAN amd64
Tonight while starting an X server (on screen 1; there was another one
running as screen 0, which might or might not be important) I hit
ctrl-alt-f1 at, apparently, just the wrong time. This left wscons
unable to switch VTs. Hitting ctrl-alt-Fn (for any n) did nothing;
explicitly switching with wsconscfg(*) yielded EBUSY.
It looks as if the EBUSY comes from line 1943 of wsdisplay.c, meaning
that the SC_SWITCHPENDING flag got set and some race condition
associated with starting up the X server caused the operation that's
supposed to clear the flag to get lost.
The EBUSY might instead be coming from line 1972 but I don't think so
judging from what SCR_GRAPHICS is documented to mean and the fact that
I have an ordinary x86 text console.
On the other hand it looks as if SC_SWITCHPENDING should be cleared by
suspending and resuming wsdisplay0. I tried to do that and couldn't
get it to do anything; but maybe I was doing it wrong.
(*) (Why is this functionality found in wscons*cfg* rather than
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