From owner-freebsd-fs  Wed Apr  4  5:42:59 2001
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Date: Wed, 4 Apr 2001 22:41:27 +1000 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: "Matthew H. North" <ctsmhn@cts.com>
Cc: freebsd-fs@FreeBSD.ORG
Subject: Re: Reproducible kernel panics in ffs_valloc: dup_alloc
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On Tue, 3 Apr 2001, Matthew H. North wrote:

> After spending hours trouble-shooting this and looking for similar problems
> and solutions in the bug archive, google, etc., I'm running out of ideas.
> 
> I am responsible for maintaining a squid cache system for my company.
> Currently, the system is: PIII/800MHz, 768MB RAM (1GB cache), FreeBSD
> 4.2-STABLE, Squid-2.3STABLE4 (compiled locally instead of using the FreeBSD
> port).  Boot drive and Squid cache drives are SCSI-LVD running at 80MB/s off
> of the Adaptec 29160N card.  Softupdates are not enabled on *any* of the
> drives in this system.
> 
> Unfortunately this system has been plagued by kernel panics for a number of
> weeks now.  I originally assumed there was some sort of hardware problem,
> but I've since replaced every last piece of hardware: MB, RAM, CPU, SCSI
> card, SCSI cable, SCSI drives, video card, NICs.  Every last piece of
> hardware has been replaced, yet the kernel panics persists on a fairly
> regular basis.

I wonder if the longstanding bugs in vfs_bio_clrbuf() could cause this
problem (rev.1.188 of vfs_bio.c fixed only some of the bugs).  Quick fix:

Index: vfs_bio.c
===================================================================
RCS file: /home/ncvs/src/sys/kern/vfs_bio.c,v
retrieving revision 1.273
diff -u -2 -r1.273 vfs_bio.c
--- vfs_bio.c	2001/02/28 04:13:07	1.273
+++ vfs_bio.c	2001/04/04 12:35:26
@@ -3088,5 +3088,5 @@
 	int i, mask = 0;
 	caddr_t sa, ea;
-	if ((bp->b_flags & (B_VMIO | B_MALLOC)) == B_VMIO) {
+	if (0 || (bp->b_flags & (B_VMIO | B_MALLOC)) == B_VMIO) {
 		bp->b_flags &= ~B_INVAL;
 		bp->b_ioflags &= ~BIO_ERROR;


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