This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] segfault in VM

Derek Glidden wrote:

On Jul 19, 2004, at 9:01 PM, Derek Glidden wrote:

(XEN) (file=x86_32/emulate.c, line=228) Bailing: not a -ve offset into 4GB segment. (XEN) (file=x86_32/emulate.c, line=235) !!!! DISALLOWING UNSAFE ACCESS !!!!

After pounding on that box pretty much all evening with "nosmp", I wasn't able to make it crash, either in dom0 or a VM, like I had been able to do in SMP mode.

Which revision of the code were you running there? I'd like to give it a go...

I had some weirdness in dom0 when I woke up and checked on it this morning - a compile had failed that shouldn't have, but there were no log messages either from Xen or dom0, so I'm not really sure what that was.

Tonight I'll pull the latest changes and rebuild everything, reboot it without "nosmp" (make it SMP again) and see what happens.

I've been trying various old revisions as far back as 1.1068[*] (so far), and I can't find one that doesn't blow up.

My test is to run James' 'compare' script in domain0 on two large identical files of randomness, and compile various things continuously in a 2.4.26 domain1. It usually takes only a few minutes to start showing differences, and if I leave it I'll get segfaults in domain0, then (with at least one revision) a panic in domain0 and reboot.

Just now I tried the latest code (post Keir's 1.1116/1.1117 csets) and I'm seeing much the same results.

Hardware is a Dell 1650, single CPU, 1G RAM, aacraid controller. I've got rid of the devicemapper stuff I was running before, and domain1's root is on an ordinary disk partition.


[*] is this a suitably precise way of specifying revision? 1.1068 is based on the list from:

This SF.Net email is sponsored by BEA Weblogic Workshop
FREE Java Enterprise J2EE developer tools!
Get your free copy of BEA WebLogic Workshop 8.1 today.
Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>