[Xen-users] qemu-dm memory leak?

[Niklas Bivald <niklas@xxxxxxxxxx>]

Hi,

Me and another sysadmin has independently been researching a problem where DomU 
randomly locks (Can’t reach it via xl console, no ping / SSH connection, shown 
as stuck in running-state in xentop) on two of our separate machines (installed 
completely independently):

Dom0:
        Debian 7.0 with Xen version: 4.1.4 and xen-utils 4.1.4-3+deb7u1
        Debian 7.1 with Xen version: 4.1

DomU: 
        7.0
        7.1(.3)

Common denominator appears to be qemu-dm consuming (leaking?) memory until the 
Dom0 swaps. When the Dom0 swap is full, the domU appears to be locked (see 
above) Dom0, at which time a hard reboot a.ka. xl destroy + xl create is the 
only way to get it back.
This *could* be related to "[Xen-devel] qemu-system-i386: memory leak?" 
http://xen.markmail.org/message/chqpifrj46lxdxx2

DomU by themselves doesn’t use any abnormal memory or swap.

To give an overview, currently Dom0 uses 26GB of swap with 8 active domU. Swap 
per process:

Pid                     Swap                    Process                         
                                                                        Uptime
3766            98452 kB                        qemu-dm -d 29 -domain-name 
[hostname] -nographic -M xenpv               160 days
6100            276988 kB               qemu-dm -d 42 -domain-name [hostname] 
-nographic -M xenpv               108 days                
6790            121620 kB               qemu-dm -d 46 -domain-name [hostname] 
-nographic -M xenpv               95 days
10616           791616 kB               qemu-dm -d 51 -domain-name [hostname] 
-nographic -M xenpv               32 days
11588           3514436 kB              qemu-dm -d 49 -domain-name [hostname] 
-nographic -M xenpv               73 days
16290           170436 kB               qemu-dm -d 43 -domain-name [hostname] 
-nographic -M xenpv               107 days                
26974           1647248 kB              qemu-dm -d 48 -domain-name [hostname] 
-nographic -M xenpv               92 days
32403           21147060 kB             qemu-dm -d 52 -domain-name [hostname] 
-nographic -M xenpv               29 days

Generally, the higher usage the higher swap. Possibly, the higher IO the higher 
swap.

Any ideas on how to solve the issue?

Regards,
Niklas
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