Re: port-xen/47057: Xen NetBSD DomU file system trash under Linux Dom0

[Roger Pau Monné <roger.pau%citrix.com@localhost>]

The following reply was made to PR port-xen/47057; it has been noted by GNATS.

From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau%citrix.com@localhost>
To: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
Cc: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <royger%NetBSD.org@localhost>,
        "gnats-bugs%NetBSD.org@localhost" <gnats-bugs%NetBSD.org@localhost>,
        "port-xen-maintainer%netbsd.org@localhost" 
<port-xen-maintainer%NetBSD.org@localhost>,
        "gnats-admin%netbsd.org@localhost" <gnats-admin%NetBSD.org@localhost>, 
"netbsd-bugs%netbsd.org@localhost"
        <netbsd-bugs%NetBSD.org@localhost>
Subject: Re: port-xen/47057: Xen NetBSD DomU file system trash under Linux
 Dom0
Date: Tue, 23 Oct 2012 09:45:48 +0200

 I think I've found the problem, it seems to be related to
 xengnt_more_entries, but still haven't been able to point exactly when
 the overwrite of xenstore_interface happens. Just after the call to
 xengnt_more_entries the ring gets corrupted, but it's not the call
 itself that corrupts the ring.
 
 xengnt_more_entries start: prod: 3787 cons: 3787
 xengnt_more_entries: map 0x1610ff -> 0xffffa0002da45000
 xengnt_more_entries end: prod: 3787 cons: 3787
 xb_read: xenstore_interface: 0xffffffff80b0a000
 xb_read: cons: 673215352 prod: 1651402104
 xb_read EIO
 xenbus_xs (process_msg:763) xb_read hdr 5.
 panic: XENBUS error 5 while reading message