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Date:      Wed, 05 Jun 2019 16:17:38 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 238333] bhyve random crash in rfb.c on FreeBSD current (after r346011)
Message-ID:  <bug-238333-27103-MU5XBwSvnJ@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-238333-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-238333-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D238333

--- Comment #3 from Conrad Meyer <cem@freebsd.org> ---
I should add, if you still have gdb open:

(In reply to olevole from comment #0)
> Thread 29 "rfbout" received signal SIGBUS, Bus error.
> [Switching to LWP 101756 of process 93578]
> memcpy () at /usr/src/lib/libc/amd64/string/memmove.S:306
> 306             MEMMOVE erms=3D0 overlap=3D1 begin=3DMEMMOVE_BEGIN end=3D=
MEMMOVE_END
> (gdb) bt
> #0  memcpy () at /usr/src/lib/libc/amd64/string/memmove.S:306

'info registers' might be interesting here, in tandem with 'show disas' or =
'x/i
$rip'.

> (gdb) p len
> $1 =3D 9600016

That's our 2000*1200*4 + 16 magic number from earlier.

> print sizeof(strm)
> $2 =3D 8
>=20
> (gdb) print sizeof(s)
> $3 =3D 8

These are just the pointers.  Please 'print *strm' and '*s'.

--=20
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