The following reply was made to PR kern/34735; it has been noted by GNATS.

From: Manuel Bouyer <bouyer@antioche.eu.org>
To: kern-bug-people@NetBSD.org, gnats-admin@NetBSD.org,
	netbsd-bugs@NetBSD.org
Cc: 
Subject: Re: kern/34735: diagnostic assertion failed  genfs_vnops.c 1123
Date: Fri, 6 Oct 2006 19:54:18 +0200

 On Fri, Oct 06, 2006 at 05:40:01PM +0000, bouyer@lip6.fr wrote:
 > >Description:
 > 	This box is a ftp/http server, with quite a lot of traffic serving
 > 	static files. ftp is the ftpd from base distrib started from inetd,
 > 	httpd is apache 2.0 from pkgsrc-2006Q2. Both a configured to use
 > 	mmap.
 > 
 > 	It has been running for about a month without problems.
 > 	Today the box paniced with:
 > panic: kernel diagnostic assertion "startoff < endoff || endoff == 0" failed: file "/Volumes/data/bouyer/netbsd-3/src/sys/miscfs/genfs/genfs_vnops.c", line 1123
 > 
 > 	cpu_Debugger() at netbsd:cpu_Debugger+0x5
 > 	panic() at netbsd:panic+0x1c8
 > 	__assert() at netbsd:__assert+0x21
 > 	genfs_putpages() at netbsd:genfs_putpages+0x6e9
 > 	uvn_put() at netbsd:uvn_put+0x31
 > 	uvm_map_clean() at netbsd:uvm_map_clean+0x246
 > 	sys_madvise() at netbsd:sys_madvise+0x75
 > 	syscall_plain() at netbsd:syscall_plain+0xe4
 > 
 > 	The box was not specially loaded when this happened (it had much
 > 	highter load in the past days); but I changed vm.filemax to 75
 > 	(from default) 3 days ago; and this caused the box to start swapping
 > 	a little (before this the swap space was completely unused).
 > 	Maybe it's related.
 
 Thinking about it, it's also possible that a file got truncated or deleted
 while it was mmap'ed. Could this trigger this diagnostic ?
 
 -- 
 Manuel Bouyer <bouyer@antioche.eu.org>
      NetBSD: 26 ans d'experience feront toujours la difference
 --