Am 06.04.2015 um 21:02 schrieb Peter Lieven: > Am 06.04.2015 um 20:50 schrieb John Snow: >> >> On 04/06/2015 02:47 PM, Peter Lieven wrote: >>> Hi all, >>> >>> is there a known issue in Qemu 2.2.1 where IDE stalls sometimes after a >>> migration with Qemu 2.2.1? >>> The migration succeeds, but it seems that the complete I/O is hanging. This >>> happens only sometimes >>> and only with extreme old Linux Guests (SLES 10 with Kernel 2.6.16) thus >>> the IDE controller as >>> storage controller for the system disk. >>> >>> Maybe this sounds familiar to someone. >>> >>> Thank you, >>> Peter >>> >> It's news to me. > Okay, I was hoping that I just missed a patch or someone forgot to CC > qemu-stable... :-) > >> Is this a regression? > I can't say we see those vServers hang sometime after migration since we > changed the hypervisor from qemu-kvm-1.2.0 to qemu-2.2.0. > > >> Any particular workload or reproducer? > Workload is almost zero. I try to figure out if there is a way to trigger it. > > Maybe playing a role: Machine type is -M pc1.2 and we set -kvmclock as > CPU flag since kvmclock seemed to be quite buggy in 2.6.16... > > Exact cmdline is: > /usr/bin/qemu-2.2.1 -enable-kvm -M pc-1.2 -nodefaults -netdev > type=tap,id=guest2,script=no,downscript=no,ifname=tap2 -device > e1000,netdev=guest2,mac=52:54:00:ff:00:65 -drive > format=raw,file=iscsi://172.21.200.53/iqn.2001-05.com.equallogic:4-52aed6-88a7e99a4-d9e00040fdc509a3-XXX-hd0/0,if=ide,cache=writeback,aio=native > -serial null -parallel null -m 1024 -smp 2,sockets=1,cores=2,threads=1 > -monitor tcp:0:4003,server,nowait -vnc :3 -qmp tcp:0:3003,server,nowait -name > 'XXX' -boot order=c,once=dc,menu=off -drive > index=2,media=cdrom,if=ide,cache=unsafe,aio=native,readonly=on -k de > -incoming tcp:0:5003 -pidfile /var/run/qemu/vm-146.pid -mem-path /hugepages > -mem-prealloc -rtc base=utc -usb -usbdevice tablet -no-hpet -vga cirrus > -cpu qemu64,-kvmclock > > Exact kernel is: > 2.6.16.46-0.12-smp (i think this is SLES10 or sth.) > > The machine does not hang. It seems just I/O is hanging. So you can type at > the console or ping the system, but no longer login. > > Thank you, > Peter
Interesting observation: Migrating the vServer again seems to fix to problem (at least in one case I could test just now). 2.6.8-24-smp is also affected. Thanks, Peter