On 08/19/2012 12:19 PM, Whit Blauvelt wrote: > Hi, > > Did something dumb - had two VM hosts with DRBD mirroring of VMs on the same > UPS, which failed and crashed them both. While I've got VMs running now on > both, "virsh list" and "virsh start" and so on are just hanging. I'm not > seeing it log anything in these instances - just hanging. > > Both systems are Ubuntu 10.10, one with the stock libvirtd 0.8.3 and one > with 0.9.12 compiled from source. They each brought up their autostart VMs > okay. But I've got no working virsh shell on either now. The 0.9.12 host > was, to complicate this report, okay with virsh initially, or "virsh list" > anyway. But it hung with a "virsh start," and now "virsh list" fails too. Libvirt 0.8.3 didn't have any priority commands - hang in one (such as failure to communicate with the qemu monitor due to confusion on running a domain twice) could starve all other commands. But we fixed that in the meantime, and libvirt 0.9.12 is supposed to be able to 'virsh list' without any delay due to a hung low-priority command. > > So ... what should I look for to have been left where by the crash that's > making virsh hang? Do you have debugging symbols handy? At this point, a gdb backtgrace would be the best place to look for clues. > > Is there any way to get virsh to provide debugging info in a > coffee-addled-friendly way? I've of course Googled "virsh list" hanging, but > without finding anything that seems to directly apply to my case, although > it's been seen before. I'm not sure I have the best suggestions today, but maybe someone else can also chime in. Good luck. -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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