kvm trouble

[Andrey N. Oktyabrski]

On 08.06.2013 13:59, Andrey N. Oktyabrski wrote:
> On 17.05.2013 14:32, Andrey N. Oktyabrski wrote:
>> I have a problem with DragonFly v3.4.1.5.g6a92f on kvm virtual machine.
>> It hangs after some time after boot. Without panic and crashdump.
>>
>> DragonFly v3.4.1.2.g0622d on another kvm works fine.
>>
>> Both are x86_64
> Is it possible that the root of evil is too small amount of RAM (500MB)?
>
The issue is 100% repeatable: 10 minutes of "make buildworld" stops VM. 
RAM-related issue is possible:
14:01 ano at df:/usr/src:$ nohup make buildworld &
[1] 991
14:01 ano at df:/usr/src:$ appending output to nohup.out
14:01 ano at df:/usr/src:$ vmstat 5 55555
  procs      memory      page                    disks     faults      cpu
  r b w     avm    fre  flt  re  pi  po  fr  sr vb0 md0   in   sy  cs us 
sy id
  8 0 0       0 218260 304092   0 4670   0 225988   0   0   0 254672 
390274 483212  0 39 61
  9 1 0       0 182384 19929   0  12   0 18771   0 701   0 1068 6397 
2243 20 40 40
  8 0 0       0 173108 60966   0   3   0 56394   0 180   0  412 21837 
1344 46 41 13
  8 0 0       0 160084 53414   0   0   0 52811   0  30   0  245 19606 
765 71 28  1
  7 1 0       0 170948 58870   0   2   0 60584   0  83   0  300 17803 
906 69 28  3
...
  9 0 0       0 113028 47992   0   0   0 48474   0  13   0  224 25054 
675 64 36  0
  8 0 0       0  19484 68168   0   0  30 63626 3754  56   0  262 17087 
919 66 33  1
  8 0 0       0  21552 25782   0   0   4 25909 41986   3   0  215 5669 
547 88 12  0
  7 2 0       0   9408 11241  10  30 2427 11390 149136 1988   0 1385 
2332 2963 34 42 25
  8 0 0       0  15912 48046  22  85 1679 47669 49538 1441   0 1225  984 
2932 47 37 16
  7 2 0       0  10980 10560 167 2109 1962 12163 110406 3302   0 3105 
1052 6732 36 44 19

At this point system is not responsible. The last three lines are bit 
strange IMHO.