Date: Sun, 28 Apr 2002 18:58:13 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Robert Watson <rwatson@FreeBSD.ORG> Cc: current@FreeBSD.ORG Subject: Re: Page fault in swp_pager_meta_build() Message-ID: <200204290158.g3T1wDh60486@apollo.backplane.com> References: <Pine.NEB.3.96L.1020428150401.64976L-100000@fledge.watson.org>
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:It currently has no swap started at all, which is one reason I was rather
:puzzled to see this panic:
:
:192.168.50.1:/cboss/devel/nfsroot/crash2.cboss.tislabs.com / nfs ro 0 0
:proc /proc procfs rw 0 0
:/dev/ad0s1e /mnt ufs rw 0 0
:...
:Should it even be hitting this code if swap hasn't been enabled? I've run
:into a couple of other weird bugs and wouldn't be surprised if there is a
:memory allocation problem. The problem I was actually trying to reproduce
:with these two crash boxes was one where the socket used by NFS get
:zero'd, resulting in a null pointer dereference. The other one is in odd
:panic in the mutex code during an early VFS operation.
:
:Robert N M Watson FreeBSD Core Team, TrustedBSD Project
The case can be hit but it shouldn't have found any swap to free.
Huh. Maybe there is a degenerate case in the swap code that
blows up if swap is compiled in but no swap has been added. If the
problem goes away when you add a tiny amount of swap that would confirm
it. What is the 'swhash_mask' global contain?
-Matt
Matthew Dillon
<dillon@backplane.com>
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