Re: [Qemu-discuss] Latest Qemu-COLO Segfaults

[Lukas Straub]

Hello Everyone,
Any Status on this?

Kind Regards,
Lukas Straub

On Sat, 17 Feb 2018 17:36:29 +0100
Lukas Straub <address@hidden> wrote:

> Hello Mr. Chen,
> I was trying your latest Version of Qemu-COLO
> (https://github.com/zhangckid/qemu/tree/qemu-colo-18jan19) with both
> Qemu Instances running on One Host. However the Secondary always
> Segfaults after entering the QMP Commands, and Sometimes even the
> Primary Segfaults, depending on the -cpu Parameter. Everything is
> working fine when not using COLO.
> 
> Kind Regards,
> Lukas Straub
> 
> 
> Primary Command:
> 
> ./qemu-system-x86_64 -enable-kvm -cpu host -m 1024 -qmp stdio -name
> primary -netdev
> tap,helper=/usr/lib/qemu/qemu-bridge-helper,id=hn0,vhost=off -device
> virtio-net-pci,id=net-pci0,netdev=hn0 -drive
> if=virtio,id=primary-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,children.0.file.filename=/mnt/vms/colo-test/primary.raw,children.0.driver=raw
> -S
> 
> 
> Secondary Command:
> 
> ./qemu-system-x86_64 -enable-kvm -cpu host -m 1024 -qmp stdio -name
> secondary -netdev
> tap,helper=/usr/lib/qemu/qemu-bridge-helper,id=hn0,vhost=off -device
> virtio-net-pci,id=net-pci0,netdev=hn0 -drive
> if=none,id=secondary-disk0,file.filename=/mnt/vms/colo-test/primary-copy.raw,driver=raw,node-name=node0
> -drive
> if=virtio,id=active-disk0,driver=replication,mode=secondary,file.driver=qcow2,top-id=active-disk0,file.file.filename=/mnt/vms/colo-test/active.qcow2,file.backing.driver=qcow2,file.backing.file.filename=/mnt/vms/colo-test/hidden.qcow2,file.backing.backing=secondary-disk0
> -incoming tcp:0:8888
> 
> 
> 1. Secondary QMP Commands:
> 
> {'execute':'qmp_capabilities'}
> { 'execute': 'nbd-server-start',
>   'arguments': {'addr': {'type': 'inet', 'data': {'host':
> '127.0.0.1', 'port': '8889'} } } }
> {'execute': 'nbd-server-add', 'arguments':
> {'device':'secondary-disk0', 'writable': true } }
> 
> 
> 2. Primary QMP Commands:
> 
> {'execute':'qmp_capabilities'}
> { 'execute': 'human-monitor-command',
>   'arguments': {'command-line': 'drive_add -n buddy
> driver=replication,mode=primary,file.driver=nbd,file.host=127.0.0.1,file.port=8889,file.export=secondary-disk0,node-name=nbd_client0'}}
> { 'execute':'x-blockdev-change', 'arguments':{'parent':
> 'primary-disk0', 'node': 'nbd_client0' } } { 'execute':
> 'migrate-set-capabilities', 'arguments': {'capabilities':
> [ {'capability': 'x-colo', 'state': true } ] } } { 'execute':
> 'migrate', 'arguments': {'uri': 'tcp:127.0.0.1:8888' } }
> 
> 
> 
> Secondary in gdb (without using KVM):
> 
> Starting
> program: /home/lukas/lxcshare/build/qemu/x86_64-softmmu/qemu-system-x86_64
> -m 1024 -qmp stdio -name secondary -netdev
> tap,helper=/usr/lib/qemu/qemu-bridge-helper,id=hn0,vhost=off -device
> virtio-net-pci,id=net-pci0,netdev=hn0 -drive
> if=none,id=secondary-disk0,file.filename=/mnt/vms/colo-test/primary-copy.raw,driver=raw,node-name=node0
> -drive
> if=virtio,id=active-disk0,driver=replication,mode=secondary,file.driver=qcow2,top-id=active-disk0,file.file.filename=/mnt/vms/colo-test/active.qcow2,file.backing.driver=qcow2,file.backing.file.filename=/mnt/vms/colo-test/hidden.qcow2,file.backing.backing=secondary-disk0
> -incoming tcp:0:8888 [Thread debugging using libthread_db enabled]
> Using host libthread_db library
> "/lib/x86_64-linux-gnu/libthread_db.so.1". [New Thread 0x7fffedb07700
> (LWP 24258)] [New Thread 0x7fffdd306700 (LWP 24262)] {"QMP":
> {"version": {"qemu": {"micro": 50, "minor": 11, "major": 2},
> "package": " (v2.3.0-20031-g18b5475aba-dirty)"}, "capabilities": []}}
> [New Thread 0x7fffd7d1c700 (LWP 24269)]
> {'execute':'qmp_capabilities'} { 'execute': 'nbd-server-start',
> 'arguments': {'addr': {'type': 'inet', 'data': {'host': '127.0.0.1',
> 'port': '8889'} } } } {'execute': 'nbd-server-add', 'arguments':
> {'device': 'secondary-disk0', 'writable': true } }
> 
> {"return": {}}
> {"return": {}}
> [Thread 0x7fffdd306700 (LWP 24262) exited]
> [New Thread 0x7fffdd306700 (LWP 24462)]
> [New Thread 0x7fff479ff700 (LWP 24463)]
> {"timestamp": {"seconds": 1518884676, "microseconds": 286781},
> "event": "RESUME"}
> 
> Thread 4 "qemu-system-x86" received signal SIGSEGV, Segmentation
> fault. [Switching to Thread 0x7fffd7d1c700 (LWP 24269)]
> qemu_lockcnt_inc (address@hidden) at util/lockcnt.c:113
> 113     util/lockcnt.c: No such file or directory.
> (gdb) q
>