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Date:      Wed, 21 Apr 2021 23:19:27 +0000
From:      bugzilla-noreply@freebsd.org
To:        vbox@FreeBSD.org
Subject:   [Bug 255208] FATAL crash/reboot upon trying to mount a VirtualBox shared folder in FreeBSD guest (13.0 RELEASE)
Message-ID:  <bug-255208-26505-1PlwS4Zg3v@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-255208-26505@https.bugs.freebsd.org/bugzilla/>
References:  <bug-255208-26505@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255208

--- Comment #7 from Guido Falsi <madpilot@FreeBSD.org> ---
Created attachment 224342
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D224342&action=
=3Dedit
vboxvfs patch

Please disregard my comment #6

I think I found the problem, I'm attaching an untested patch. I'm going to =
test
it tomorrow myself.

I'm reasonably sure problem is caused by base commit 6fa079fc3f5e (svn r355=
790)
[1]

There a VFS_VOP_VECTOR_REGISTER() call is performed on the vnodeops struct.=
 I'm
not sure what it does, but it missing could explain why a null function poi=
nter
ends up being called.

If anyone wants to test, and report back they are welcome, but please note =
that
I have not even tried compiling it for now.


[1]
https://cgit.freebsd.org/src/commit/?id=3D6fa079fc3f5e7e120f166420c6f0c60f7=
01ba9ae

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