On 29-10-15 16:38, Voloshanenko Igor wrote: > Hi Wido and all community. > > We catched very idiotic issue on our Cloudstack installation, which > related to ceph and possible to java-rados lib. > I think you ran into this one: https://issues.apache.org/jira/browse/CLOUDSTACK-8879 Cleaning up RBD snapshots for volumes didn't go well and caused the JVM to crash. Wido > So, we have constantly agent crashed (which cause very big problem for > us... ). > > When agent crashed - it's crash JVM. And no event in logs at all. > We enabled crush dump, and after crash we see next picture: > > #grep -A1 "Problematic frame" < /hs_err_pid30260.log > Problematic frame: > C [librbd.so.1.0.0+0x5d681] > > # gdb /usr/lib/librbd.so.1.0.0 /var/tmp/cores/jsvc.25526.0.core > (gdb) bt > ... > #7 0x00007f30b9a1fed2 in ceph::log::SubsystemMap::should_gather > (level=<optimized out>, sub=<optimized out>, this=<optimized out>) > at ./log/SubsystemMap.h:62 > #8 0x00007f30b9a3b693 in ceph::log::SubsystemMap::should_gather > (this=<optimized out>, sub=<optimized out>, level=<optimized out>) > at ./log/SubsystemMap.h:61 > #9 0x00007f30b9d879be in ObjectCacher::flusher_entry > (this=0x7f2fb4017910) at osdc/ObjectCacher.cc:1527 > #10 0x00007f30b9d9851d in ObjectCacher::FlusherThread::entry > (this=<optimized out>) at osdc/ObjectCacher.h:374 > > From ceph code, this part executed when flushing cache object... And we > don;t understand why. Becasue we have absolutely different race > condition to reproduce it. > > As cloudstack have not good implementation yet of snapshot lifecycle, > sometime, it's happen, that some volumes already marked as EXPUNGED in > DB and then cloudstack try to delete bas Volume, before it's try to > unprotect it. > > Sure, unprotecting fail, normal exception returned back (fail because > snap has childs... ) > > 2015-10-29 09:02:19,401 DEBUG [kvm.resource.KVMHAMonitor] > (Thread-1304:null) Executing: > /usr/share/cloudstack-common/scripts/vm/hypervisor/kvm/kvmheartbeat.sh > -i 10.44.253.13 -p /var/lib/libvirt/PRIMARY -m > /mnt/93655746-a9ef-394d-95e9-6e62471dd39f -h 10.44.253.11 > 2015-10-29 09:02:19,412 DEBUG [kvm.resource.KVMHAMonitor] > (Thread-1304:null) Execution is successful. > 2015-10-29 09:02:19,554 INFO [kvm.storage.LibvirtStorageAdaptor] > (agentRequest-Handler-5:null) Unprotecting and Removing RBD snapshots of > image 6789/71b1e2e9-1985-45ca-9ab6-9e5016b86b7c prior to removing the image > 2015-10-29 09:02:19,571 DEBUG [kvm.storage.LibvirtStorageAdaptor] > (agentRequest-Handler-5:null) Succesfully connected to Ceph cluster at > cephmon.anolim.net:6789 <http://cephmon.anolim.net:6789> > 2015-10-29 09:02:19,608 DEBUG [kvm.storage.LibvirtStorageAdaptor] > (agentRequest-Handler-5:null) Unprotecting snapshot > cloudstack/71b1e2e9-1985-45ca-9ab6-9e5016b86b7c@cloudstack-base-snap > 2015-10-29 09:02:19,627 DEBUG [kvm.storage.KVMStorageProcessor] > (agentRequest-Handler-5:null) Failed to delete volume: > com.cloud.utils.exception.CloudRuntimeException: > com.ceph.rbd.RbdException: Failed to unprotect snapshot cloudstack-base-snap > 2015-10-29 09:02:19,628 DEBUG [cloud.agent.Agent] > (agentRequest-Handler-5:null) Seq 4-1921583831: { Ans: , MgmtId: > 161344838950, via: 4, Ver: v1, Flags: 10, > [{"com.cloud.agent.api.Answer":{"result":false,"details":"com.cloud.utils.exception.CloudRuntimeException: > com.ceph.rbd.RbdException: Failed to unprotect snapshot > cloudstack-base-snap","wait":0}}] } > 2015-10-29 09:02:25,722 DEBUG [cloud.agent.Agent] > (agentRequest-Handler-2:null) Processing command: > com.cloud.agent.api.GetHostStatsCommand > 2015-10-29 09:02:25,722 DEBUG [kvm.resource.LibvirtComputingResource] > (agentRequest-Handler-2:null) Executing: /bin/bash -c idle=$(top -b -n > 1| awk -F, '/^[%]*[Cc]pu/{$0=$4; gsub(/[^0-9.,]+/,""); print }'); echo $idle > 2015-10-29 09:02:26,249 DEBUG [kvm.resource.LibvirtComputingResource] > (agentRequest-Handler-2:null) Execution is successful. > 2015-10-29 09:02:26,250 DEBUG [kvm.resource.LibvirtComputingResource] > (agentRequest-Handler-2:null) Executing: /bin/bash -c > freeMem=$(free|grep cache:|awk '{print $4}');echo $freeMem > 2015-10-29 09:02:26,254 DEBUG [kvm.resource.LibvirtComputingResource] > (agentRequest-Handler-2:null) Execution is successful. > > BUT, after 20 minutes - agent crashed... If we remove all childs and > create conditions for cloudstack to delete volume - all OK - no agent > crash in 20 minutes... > > We can't connect this action - Volume delete with agent crashe... Also > we don't understand why +- 20 minutes need to last, and only then agent > crashed... > > From logs, before crash - only GetVMStats... And then - agent started... > > 2015-10-29 09:21:55,143 DEBUG [cloud.agent.Agent] (UgentTask-5:null) > Sending ping: Seq 4-1343: { Cmd , MgmtId: -1, via: 4, Ver: v1, Flags: > 11, > [{"com.cloud.agent.api.PingRoutingCommand":{"newStates":{},"_hostVmStateReport":{"i-881-1117-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"},"i-7-106-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"},"i-1683-1984-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"},"i-11-504-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"},"i-325-616-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"},"i-10-52-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"},"i-941-1237-VM":{"state":"PowerOn","host":"cs2.anolim.net > <http://cs2.anolim.net>"}},"_gatewayAccessible":true,"_vnetAccessible":true,"hostType":"Routing","hostId":4,"wait":0}}] > } > 2015-10-29 09:21:55,149 DEBUG [cloud.agent.Agent] (Agent-Handler-3:null) > Received response: Seq 4-1343: { Ans: , MgmtId: 161344838950, via: 4, > Ver: v1, Flags: 100010, > [{"com.cloud.agent.api.PingAnswer":{"_command":{"hostType":"Routing","hostId":4,"wait":0},"result":true,"wait":0}}] > } > 2015-10-29 09:22:20,755 DEBUG [cloud.agent.Agent] > (agentRequest-Handler-5:null) Processing command: > com.cloud.agent.api.GetVmStatsCommand > 2015-10-29 09:23:02,630 INFO [cloud.agent.AgentShell] (main:null) Agent > started > 2015-10-29 09:23:02,632 INFO [cloud.agent.AgentShell] (main:null) > Implementation Version is 4.3.2 > > > Can you please give us direction to go deeper... As we dont udnerstand > what happened... > > Issue reproducing very easy: > > (to speed up delete process we set storage.cleanup.interval=10) > > 1. Create Volume > 2. Attach it to VM > 3. Create snapshot from this volume by hand on ceph > 4. Do snap_protect by hand on ceph for snap from previous step > 5. Create child via snap clone > 6. Deattach volume from VM and delete it > > Our problem - that this happen not in such lab situation, but in real > life... _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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