[Xen-devel] qemu-dm segfault with multiple HVM domains?

[John Clemens <jclemens@xxxxxxxxxxxxxxx>]

When running multiple HVM/VT win2003 domains on a large system (4socket, 
8core, HT), qemu-dm will often segfault on all but one of the domains. My 
last sucessful test was on friday. (with yesterday's tip (8911), all my 
windows domains hung on boot, and today's (8922) won't compile due to the 
physbase problem in domain.c that there's a patch pending for..I'll be 
trying with that soon, and then reverting back until I find the changeset 
that broke it)
The easiest way to reproduce is to start up 4 windows domains in rapid 
succession.  Each one will start to boot, but early in the boot 
process, three of the 4 qemu-dm processes will crash.  The fourth one 
will continue on just fine.  The core dumps left behind are garbage.
> From dom0 dmesg:
qemu-dm[4721]: segfault at 0000000000000000 rip 0000000000000000 rsp 
0000000040800198 error 14
xenbr0: port 5(tun2) entering disabled state
device tun2 left promiscuous mode
xenbr0: port 5(tun2) entering disabled state
qemu-dm[4705]: segfault at 0000000000000000 rip 0000000000000000 rsp 
0000000040800198 error 14
xenbr0: port 4(tun1) entering disabled state
device tun1 left promiscuous mode
xenbr0: port 4(tun1) entering disabled state
qemu-dm[4689]: segfault at 0000000000000000 rip 0000000000000000 rsp 
0000000040800198 error 14
If you stagger the startup times a little bit, the domains will come up 
and stay up for a while (~10-30minutes) and then all but one qemu-dm will 
eventually segfault.  If I run just one domain it seems to work fine, 
running over the weekend with very light load.
I see that others have been running HVM domain tests, has anyone run 
multiple Windows domains for any period of time on HVM?  Has anyone tried 
to start multiple windows domains in rapid succession?
Thanks,
john.c

- --
John Clemens                    jclemens@xxxxxxxxxxxxxxx

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