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Re: kern/54759: vm.ubc_direct deadlock when read()/write() into mapping of itself
The following reply was made to PR kern/54759; it has been noted by GNATS.
From: Andrew Doran <ad%netbsd.org@localhost>
Subject: Re: kern/54759: vm.ubc_direct deadlock when read()/write() into
mapping of itself
Date: Wed, 15 Jan 2020 20:03:43 +0000
I can see how to prevent the deadlock (which I will try to do). There is
another problem though. This goes ape bouncing around on PG_BUSY for
libc.so's pages when doing build.sh on my machine. I will try a bandaid
with wakeup_one() but I think it needs PG_BUSY to be a kind of reader/writer
lock to (something we could also use elsewhere).
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