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Date: Tue, 25 Nov 2014 10:31:45 +0300
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Ruslan Bukin <br@freebsd.org>
Subject: Re: svn commit: r274914 - in head/sys: kern sys ufs/ffs vm
Message-ID: <20141125073145.GT47144@FreeBSD.org>
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Cc: Konstantin Belousov <kostikbel@gmail.com>, svn-src-head@freebsd.org,
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On Mon, Nov 24, 2014 at 09:16:20PM +0000, Ruslan Bukin wrote:
R> On Mon, Nov 24, 2014 at 10:29:02PM +0300, Gleb Smirnoff wrote:
R> > On Mon, Nov 24, 2014 at 06:03:56PM +0000, Ruslan Bukin wrote:
R> > R> > I this on stock kernel or on kernel with your modifications ?
R> > R> 
R> > R> Stock one. I also checked with no virtio but MDROOT - same problems.
R> > 
R> > I could expect a panic with a damaged 'struct buf', but not vm_page.
R> > 
R> > Can you please do a clean build pre-r274914, and then again a clean
R> > build of r274914, and then confirm that the former is stable, but the
R> > latter panics?
R> 
R> Yes, I just proceeded re-check both builds with removing obj dir each time and I still see the problem starting with r274914.
R> 
R> Also restoring files like that on latest head makes things happy (no panics):
R> svnlite up -r274913 sys/kern/vfs_default.c sys/kern/vnode_if.src sys/sys/buf.h sys/sys/vnode.h sys/ufs/ffs/ffs_vnops.c sys/vm/swap_pager.c sys/vm/vm_pager.h sys/vm/vnode_pager.c sys/vm/vnode_pager.h

Can you please try to un-union the struct buf and see if it helps?

-- 
Totus tuus, Glebius.