Subject: Heavy swapping causes deadlock in uvm_unlock_fpageq
To: None <current-users@Netbsd.org>
From: Rick Byers <RickB@BigScaryChildren.net>
Date: 07/05/2001 09:07:11
I just started doing more memory intensive stuff (i.e. lots of swapping)
on my NetBSD-1.5.1/i386 machine, and have been having problems with it
hanging. I can still switch virtual consoles and break into the debugger,
but nothing else works. Here is the stack trace:
So it looks like there is some sort of deadlock in the paging code. I
left top running this last time and when it froze top wasn't indicating
that swap space was almost exhausted or anything (infact I think it said
100 Mb free) - although there were about 6 perl processes running.
Anyway, so my question is - I haven't noticed anything like this on my
NetBSD-current/i386 machine (although it probably doesn't do as much
swapping), does anyone know of anything that may have been fixed in
-current but not -release that could cause this?
My -release is built from June 26 sources - I'm updating now just in case.
I've got a crash dump, so if there is anything I can do to help track this
down - let me know. It's happened twice now in the last 12 hours, so I'm
sure it'll happen again...