Re: unpredictable Xen crash w NetBSD 5.0.2(XEN3PAE_DOMU)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sat, Sep 25, 2010 at 09:36:16PM +0800, ? wrote:
> Sorry for my English.
> Let me explain more detail what I would like to do.
> Here is my setup.
> 
> 1. One Linux box(D0) acts as dom0 with Xen4.0
> 
> 2. One NetBSD 5.0.2(Du502) act as domU on D0
> 2.1 pkg_add aoe-vblade in Du502 and run as an AoE target[1,2], AoE is
> similar to iSCSI
> 2.2 ex: vblade 1 1 xennet0 /TEST.img
> 
> 3. Another Linux box(C1) issues read/write requests with dd
> 3.1. the /dev/etherd/e?.?[3] is AoE target block device which is
> exported by Du502 and
>        is showed under C1's /dev/etherd path
> 3.2 ex: modprobe aoe # ls /dev/etherd will find /dev/etherd/e1.1
>            for i in {1..65535}; dd if=/dev/zero of=/dev/etherd/e1.1 bs=4K; 
> done
> 
> 4. wait for 20~40mins, D0 reboot without any warning.

looks like a Xen or dom0 bug. Even if NetBSD is doing something
forbidden, this should not crash the hypervisor or dom0.

>   dd of=/dev/zero if=/dev/etherd/e1.1
> 
> And Yes, I tried
> ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-5.1_RC4/i386/binary/kernel/netbsd-XEN3PAE_DOMU.gz
> I'll try 
> ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-4.0.1/i386/binary/kernel/netbsd-XEN3_DOMU.gz
> netbsd-current and Xen 3.4.2 later, but it would take a little time
> And I try figure out how to remote debug netbsd kernel.(Is it possible?)

there is still some KGDB support around but I've never tried using it.
I usually use the in-kernel debugger on the console

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--