Date: Mon, 16 Nov 1998 23:48:41 +1100 From: Bruce Evans <bde@zeta.org.au> To: bugs@FreeBSD.ORG Subject: deadlock when swap is exhausted Message-ID: <199811161248.XAA18427@godzilla.zeta.org.au>
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Configure a system with 32MB of memory and 64MB of swap. `dd if=/dev/zero of=/dev/null bs=104m count=1' on an otherwise idle system then causes deadlock. The pageout daemon runs and keeps killing dd, but dd can't run because a critical part of it is paged out, and the pagefault handler doesn't do anything because of a shortage of resources (pages or pbufs, I think). This is a fairly old bug. I first saw it when attempting to duplicate the dying daemons problem -- make the memory hogs too large and you get deadlock instead of possibly dying daemons. Deadlock doesn't always occur -- sometimes there are enough free or freeable resources. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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