[Xen-users] Random XCP guest reboots.

[Daniel Sintaj <daniel.sintaj@xxxxxxxxxxxx>]

Hello,

the issue is quite simple: after running a scp from another machine in 
order to write data to the XCP guest - the guest will start rebooting.
The log of the Control Host Domain clearly says that the virtual machine 
got some kind of unwanted "force shutdown"
Mar  2 13:21:23 morgoth ovs-vsctl: 00001|vsctl|INFO|Called as 
/usr/bin/ovs-vsctl list-br
Mar  2 13:25:47 morgoth kernel: device tap161.0 left promiscuous mode
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: 
/local/domain/0/backend/tap/161/5632: got start/shutdown watch on 
/local/domain/0/backend/tap/161/5632/tapdisk-request
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: 
/local/domain/0/backend/tap/161/5632: got tapdisk-request 
'shutdown-force', shutdown state down (force): 0
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: driving channel state 
running, vbd down, unpaused to closed (11)
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: 
/local/domain/0/backend/tap/161/5632: sending 'force shutdown' message 
to 23:418, state running
Mar  2 13:25:47 morgoth TAPDISK[12548]: received 'force shutdown' 
message (uuid = 418)
Mar  2 13:25:47 morgoth TAPDISK[12548]: 
/dev/VG_XenStorage-60a2b615-473b-9b5c-c72f-3520844e0f2f/VHD-f1678b62-d5ba-4772-806c-ef4ca579becb: 
state: 0x00000000, new: 0x00, pending: 0x00, failed
: 0x00, completed: 0x00
Mar  2 13:25:47 morgoth TAPDISK[12548]: last activity: 
1299065394.699241, errors: 0x0000, retries: 0x0000, received: 
0x0000006b, returned: 0x0000006b, kicked: 0x0000006b, kicks in: 0x000000
44, out: 0x00000076
Mar  2 13:25:47 morgoth TAPDISK[12548]: gaps written/skipped: 0/0
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: 
/local/domain/0/backend/tap/161/5632: handled start/shutdown watch on 
/local/domain/0/backend/tap/161/5632/tapdisk-request
Mar  2 13:25:47 morgoth TAPDISK[12548]: 
/dev/VG_XenStorage-60a2b615-473b-9b5c-c72f-3520844e0f2f/VHD-f1678b62-d5ba-4772-806c-ef4ca579becb: 
b: 485, a: 2, f: 0, n: 16656
Mar  2 13:25:47 morgoth TAPDISK[12548]: closed image 
/dev/VG_XenStorage-60a2b615-473b-9b5c-c72f-3520844e0f2f/VHD-f1678b62-d5ba-4772-806c-ef4ca579becb 
(0 users, state: 0x00000000, type: 4)
Mar  2 13:25:47 morgoth TAPDISK[12548]: sending 'close response' message 
(uuid = 418)
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: got 'close response' 
message from 23:418
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: driving channel state 
closed, vbd down, unpaused to closed (11)
Mar  2 13:25:47 morgoth TAPDISK[12548]: tapdisk-log: closing after 0 errors
Mar  2 13:25:47 morgoth kernel: tap_blkif_schedule[12555]: exiting
Mar  2 13:25:47 morgoth xapi: [error|morgoth|144 xal_listen|VM (domid: 
161) device_event = device shutdown {tap,5632} D:2c22dbe5c04e|event] 
device_event could not be processed because VM record not in database
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: got remove watch on 
/local/domain/0/backend/tap/161/5632
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: 
/local/domain/0/backend/tap/161/5632: marking channel dead, uuid 418
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: driving channel state 
closed, vbd down, dead to closed (11)
Mar  2 13:25:47 morgoth BLKTAP-DAEMON[6309]: destroying channel 23:418, 
state closed
So what are the conditions for this kind of behavior? First I thought, 
that the XCP host is running out of memory (there was only cca. ~750Mb 
free, so I have freed additional 4GB by shutting down a not important 
guest.)
But when the large disk-write operations are performed, this issue remains.

We're talking about a HVM Arch Linux guest machine installed on XCP 0.5

Anybody has some thoughts?

P.S. This issue looks similar, but as I have said, the insufficient 
memory issues are now out. 
http://serverfault.com/questions/209686/finding-the-reason-of-a-force-shutdown-of-a-vm
Thanks in advance.

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