A bit more information about my hardware setup.
This is a FUJITSU PRIMERGY RX2510 M22 x Intel(R) Xeon(R) CPU E5-2620 v4 @ 
2.10GHz (8 cores in each processor)
RAM 128GB
Swap 11GB


This is a host server for approx 30 VMs (mix of Windows and Linux servers and 
workstations)
QEMU is using 64GB of the total of 128GB

We have plenty of spare RAM so I cannot see my initial Out of Memory issue as 
actually being out of memory.
I have also included the syslog showing the output for the OOM incident below 
in case this helps:
Jul 13 21:21:11 server kernel: [7601521.772315] qemu-system-x86 invoked 
oom-killer: gfp_mask=0x26000c0, order=2, oom_score_adj=0
Jul 13 21:21:11 server kernel: [7601521.772322] qemu-system-x86 cpuset=emulator 
mems_allowed=0-1
Jul 13 21:21:11 server kernel: [7601521.772332] CPU: 15 PID: 30526 Comm: 
qemu-system-x86 Tainted: G        W       4.4.0-62-generic #83-Ubuntu
Jul 13 21:21:11 server kernel: [7601521.772335] Hardware name: FUJITSU PRIMERGY 
RX2510 M2/D3279-H1, BIOS V5.0.0.11 R1.7.0 for D3279-H1x                     
04/21/2016
Jul 13 21:21:11 server kernel: [7601521.772338]  0000000000000286 
00000000093bb360 ffff8801519abaf0 ffffffff813f7c63
Jul 13 21:21:11 server kernel: [7601521.772342]  ffff8801519abcc8 
ffff88102a8a1c00 ffff8801519abb60 ffffffff8120ad4e
Jul 13 21:21:11 server kernel: [7601521.772346]  0000000000000015 
0000000000000000 ffff8820357d2f00 ffff880bff851c00
Jul 13 21:21:11 server kernel: [7601521.772350] Call Trace:
Jul 13 21:21:11 server kernel: [7601521.772361]  [<ffffffff813f7c63>] 
dump_stack+0x63/0x90
Jul 13 21:21:11 server kernel: [7601521.772369]  [<ffffffff8120ad4e>] 
dump_header+0x5a/0x1c5
Jul 13 21:21:11 server kernel: [7601521.772376]  [<ffffffff81390c14>] ? 
apparmor_capable+0xc4/0x1b0
Jul 13 21:21:11 server kernel: [7601521.772383]  [<ffffffff811926c2>] 
oom_kill_process+0x202/0x3c0
Jul 13 21:21:11 server kernel: [7601521.772386]  [<ffffffff81192ae9>] 
out_of_memory+0x219/0x460
Jul 13 21:21:11 server kernel: [7601521.772392]  [<ffffffff81198a5d>] 
__alloc_pages_slowpath.constprop.88+0x8fd/0xa70
Jul 13 21:21:11 server kernel: [7601521.772396]  [<ffffffff81198e56>] 
__alloc_pages_nodemask+0x286/0x2a0
Jul 13 21:21:11 server kernel: [7601521.772401]  [<ffffffff81198f0b>] 
alloc_kmem_pages_node+0x4b/0xc0
Jul 13 21:21:11 server kernel: [7601521.772408]  [<ffffffff8107ea5e>] 
copy_process+0x1be/0x1b70
Jul 13 21:21:11 server kernel: [7601521.772415]  [<ffffffff811c1543>] ? 
handle_mm_fault+0xbc3/0x1820
Jul 13 21:21:11 server kernel: [7601521.772423]  [<ffffffff811036f7>] ? 
do_futex+0x107/0x540
Jul 13 21:21:11 server kernel: [7601521.772426]  [<ffffffff810805a0>] 
_do_fork+0x80/0x360
Jul 13 21:21:11 server kernel: [7601521.772433]  [<ffffffff810910ef>] ? 
sigprocmask+0x6f/0xa0
Jul 13 21:21:11 server kernel: [7601521.772436]  [<ffffffff81080929>] 
SyS_clone+0x19/0x20
Jul 13 21:21:11 server kernel: [7601521.772444]  [<ffffffff818385f2>] 
entry_SYSCALL_64_fastpath+0x16/0x71
Jul 13 21:21:11 server kernel: [7601521.772447] Mem-Info:
Jul 13 21:21:11 server kernel: [7601521.772457] active_anon:8613912 
inactive_anon:2561790 isolated_anon:0
Jul 13 21:21:11 server kernel: [7601521.772457]  active_file:253319 
inactive_file:20093382 isolated_file:0
Jul 13 21:21:11 server kernel: [7601521.772457]  unevictable:31167 dirty:704072 
writeback:29263 unstable:0
Jul 13 21:21:11 server kernel: [7601521.772457]  slab_reclaimable:707348 
slab_unreclaimable:261557
Jul 13 21:21:11 server kernel: [7601521.772457]  mapped:18045 shmem:9329 
pagetables:41405 bounce:0
Jul 13 21:21:11 server kernel: [7601521.772457]  free:148686 free_pcp:0 
free_cma:0
Jul 13 21:21:11 server kernel: [7601521.772463] Node 0 DMA free:13316kB min:8kB 
low:8kB high:12kB active_anon:0kB inactive_anon:0kB active_file:0kB 
inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB 
present:15992kB managed:15900kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB 
shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB 
pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB 
writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Jul 13 21:21:11 server kernel: [7601521.772471] lowmem_reserve[]: 0 1757 64218 
64218 64218
Jul 13 21:21:11 server kernel: [7601521.772477] Node 0 DMA32 free:252604kB 
min:1228kB low:1532kB high:1840kB active_anon:354708kB inactive_anon:364440kB 
active_file:124kB inactive_file:124kB unevictable:1616kB isolated(anon):0kB 
isolated(file):0kB present:1920252kB managed:1839632kB mlocked:1616kB dirty:4kB 
writeback:0kB mapped:312kB shmem:1148kB slab_reclaimable:672460kB 
slab_unreclaimable:85320kB kernel_stack:6864kB pagetables:632kB unstable:0kB 
bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB 
pages_scanned:0 all_unreclaimable? no
Jul 13 21:21:11 server kernel: [7601521.772485] lowmem_reserve[]: 0 0 62461 
62461 62461
Jul 13 21:21:11 server kernel: [7601521.772490] Node 0 Normal free:133352kB 
min:43716kB low:54644kB high:65572kB active_anon:27141800kB 
inactive_anon:4481708kB active_file:626280kB inactive_file:29382908kB 
unevictable:38808kB isolated(anon):0kB isolated(file):0kB present:65011712kB 
managed:63960676kB mlocked:38808kB dirty:46940kB writeback:0kB mapped:56152kB 
shmem:28156kB slab_reclaimable:1159628kB slab_unreclaimable:457356kB 
kernel_stack:11424kB pagetables:64980kB unstable:0kB bounce:0kB free_pcp:0kB 
local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? 
no
Jul 13 21:21:11 server kernel: [7601521.772498] lowmem_reserve[]: 0 0 0 0 0
Jul 13 21:21:11 server kernel: [7601521.772502] Node 1 Normal free:195472kB 
min:45152kB low:56440kB high:67728kB active_anon:6959140kB 
inactive_anon:5401012kB active_file:386872kB inactive_file:50990496kB 
unevictable:84244kB isolated(anon):0kB isolated(file):0kB present:67108864kB 
managed:66057592kB mlocked:84244kB dirty:2769344kB writeback:117052kB 
mapped:15716kB shmem:8012kB slab_reclaimable:997304kB 
slab_unreclaimable:503552kB kernel_stack:9536kB pagetables:100008kB 
unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB 
writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
Jul 13 21:21:11 server kernel: [7601521.772509] lowmem_reserve[]: 0 0 0 0 0
Jul 13 21:21:11 server kernel: [7601521.772513] Node 0 DMA: 1*4kB (U) 0*8kB 
2*16kB (U) 3*32kB (U) 2*64kB (U) 0*128kB 1*256kB (U) 1*512kB (U) 0*1024kB 
2*2048kB (UM) 2*4096kB (M) = 13316kB
Jul 13 21:21:11 server kernel: [7601521.772529] Node 0 DMA32: 2060*4kB (UME) 
3571*8kB (UME) 2908*16kB (UME) 1950*32kB (UMEH) 978*64kB (UMH) 272*128kB (UMH) 
27*256kB (H) 5*512kB (H) 0*1024kB 0*2048kB 0*4096kB = 252616kB
Jul 13 21:21:11 server kernel: [7601521.772544] Node 0 Normal: 32272*4kB (UMEH) 
941*8kB (UMEH) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 
0*4096kB = 136616kB
Jul 13 21:21:11 server kernel: [7601521.772555] Node 1 Normal: 44018*4kB (UMEH) 
2622*8kB (UMEH) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 
0*4096kB = 197048kB
Jul 13 21:21:11 server kernel: [7601521.772567] Node 0 hugepages_total=0 
hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
Jul 13 21:21:11 server kernel: [7601521.772569] Node 0 hugepages_total=0 
hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
Jul 13 21:21:11 server kernel: [7601521.772571] Node 1 hugepages_total=0 
hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
Jul 13 21:21:11 server kernel: [7601521.772573] Node 1 hugepages_total=0 
hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
Jul 13 21:21:11 server kernel: [7601521.772575] 20382113 total pagecache pages
Jul 13 21:21:11 server kernel: [7601521.772577] 23445 pages in swap cache
Jul 13 21:21:11 server kernel: [7601521.772580] Swap cache stats: add 
541987737, delete 541964292, find 438258469/644757883
Jul 13 21:21:11 server kernel: [7601521.772582] Free swap  = 0kB
Jul 13 21:21:11 server kernel: [7601521.772583] Total swap = 11718652kB
Jul 13 21:21:11 server kernel: [7601521.772585] 33514205 pages RAM
Jul 13 21:21:11 server kernel: [7601521.772587] 0 pages HighMem/MovableOnly
Jul 13 21:21:11 server kernel: [7601521.772588] 545755 pages reserved
Jul 13 21:21:11 server kernel: [7601521.772589] 0 pages cma reserved
Jul 13 21:21:11 server kernel: [7601521.772591] 0 pages hwpoisoned
Jul 13 21:21:11 server kernel: [7601521.772592] [ pid ]   uid  tgid total_vm    
  rss nr_ptes nr_pmds swapents oom_score_adj name
Jul 13 21:21:11 server kernel: [7601521.772606] [  746]     0   746    24254    
 8892      52       3      902             0 systemd-journal
Jul 13 21:21:11 server kernel: [7601521.772610] [  799]     0   799    25742    
  463      19       3       27             0 lvmetad
Jul 13 21:21:11 server kernel: [7601521.772614] [  814]     0   814    11201    
  765      21       3      187         -1000 systemd-udevd
Jul 13 21:21:11 server kernel: [7601521.772618] [ 2434]   100  2434    25081    
  543      19       3       30             0 systemd-timesyn
Jul 13 21:21:11 server kernel: [7601521.772621] [ 2650]     0  2650    77162    
  424      20       4      563             0 lxcfs
Jul 13 21:21:11 server kernel: [7601521.772624] [ 2652]   107  2652    10801    
  813      27       3      104          -900 dbus-daemon
Jul 13 21:21:11 server kernel: [7601521.772627] [ 2663]     0  2663     7252    
  553      19       3       42             0 cron
Jul 13 21:21:11 server kernel: [7601521.772630] [ 2665]   104  2665    64100    
  620      28       4      341             0 rsyslogd
Jul 13 21:21:11 server kernel: [7601521.772633] [ 2667]     0  2667     6511    
  423      18       3       45             0 atd
Jul 13 21:21:11 server kernel: [7601521.772636] [ 2676]     0  2676     7470    
  237      19       3        0             0 cgmanager
Jul 13 21:21:11 server kernel: [7601521.772639] [ 2700]     0  2700    68971    
 1055      37       3      117             0 accounts-daemon
Jul 13 21:21:11 server kernel: [7601521.772642] [ 2718]     0  2718     1100    
  294       7       3        9             0 acpid
Jul 13 21:21:11 server kernel: [7601521.772645] [ 2791]     0  2791     8848    
  681      20       3     1736             0 systemd-logind
Jul 13 21:21:11 server kernel: [7601521.772648] [ 3124]     0  3124    69272    
  736      38       3      107             0 polkitd
Jul 13 21:21:11 server kernel: [7601521.772651] [ 3146]     0  3146    16380    
  755      36       3      152         -1000 sshd
Jul 13 21:21:11 server kernel: [7601521.772655] [ 3159]     0  3159     1306    
  425       8       3       12             0 iscsid
Jul 13 21:21:11 server kernel: [7601521.772658] [ 3160]     0  3160     5129    
 2574      15       3        0           -17 iscsid
Jul 13 21:21:11 server kernel: [7601521.772677] [16365]     0 16365     4966    
  469      14       3       65             0 irqbalance
Jul 13 21:21:11 server kernel: [7601521.772680] [16690]   112 16690    12496    
  367      27       3       98             0 dnsmasq
Jul 13 21:21:11 server kernel: [7601521.772683] [16901]   112 16901    12496    
  272      28       3       98             0 dnsmasq
Jul 13 21:21:11 server kernel: [7601521.772686] [16902]     0 16902    12489    
    1      27       3       95             0 dnsmasq
Jul 13 21:21:11 server kernel: [7601521.772689] [17084]   112 17084    12496    
  372      28       3       97             0 dnsmasq
Jul 13 21:21:11 server kernel: [7601521.772692] [17263]   112 17263    12496    
  386      27       3       98             0 dnsmasq
Jul 13 21:21:11 server kernel: [7601521.772694] [17442]   112 17442    12496    
  356      27       3       98             0 dnsmasq
Jul 13 21:21:11 server kernel: [7601521.772697] [17952]  1000 17952    12147    
 1496      28       3      284             0 systemd
Jul 13 21:21:11 server kernel: [7601521.772700] [17956]  1000 17956    15878    
    0      34       3     1053             0 (sd-pam)
Jul 13 21:21:11 server kernel: [7601521.772703] [18107]  1000 18107    22162    
 2963      50       4    12528             0 tmux
Jul 13 21:21:11 server kernel: [7601521.772706] [18113]  1000 18113     5658    
  459      16       3      479             0 bash
Jul 13 21:21:11 server kernel: [7601521.772709] [18280]     0 18280    13237    
  494      32       3      149             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772712] [18382]     0 18382    13071    
  466      30       3      107             0 su
Jul 13 21:21:11 server kernel: [7601521.772715] [18383]     0 18383     6002    
  893      17       3      605             0 bash
Jul 13 21:21:11 server kernel: [7601521.772717] [18798]     0 18798    48453    
  500      49       4      184          -900 virtlogd
Jul 13 21:21:11 server kernel: [7601521.772721] [21398]     0 21398    26726    
  557      51       3      464             0 sendmail-mta
Jul 13 21:21:11 server kernel: [7601521.772724] [ 2039]  1000  2039     5658    
  351      17       3      479             0 bash
Jul 13 21:21:11 server kernel: [7601521.772727] [23493]   111 23493   553726    
54242     567       6    81317             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772732] [26162]     0 26162   351716    
  768      81       6     3086             0 snapd
Jul 13 21:21:11 server kernel: [7601521.772735] [19044]     0 19044    29924    
  242      45       3        0          -900 virtlockd
Jul 13 21:21:11 server kernel: [7601521.772738] [19115]     0 19115   715569    
 3994     210       6     8497             0 libvirtd
Jul 13 21:21:11 server kernel: [7601521.772741] [21289]     0 21289    13237    
  271      30       3      150             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772743] [28861]     0 28861    13071    
  227      31       3      107             0 su
Jul 13 21:21:11 server kernel: [7601521.772746] [28871]     0 28871     5981    
  873      16       3      433             0 bash
Jul 13 21:21:11 server kernel: [7601521.772749] [ 9715]     0  9715     3410    
  322      11       3       63             0 mdadm
Jul 13 21:21:11 server kernel: [7601521.772752] [31589]   115 31589     8875    
  237      22       3      149             0 rpc.statd
Jul 13 21:21:11 server kernel: [7601521.772755] [31592]     0 31592    11940    
  458      28       3      104             0 rpcbind
Jul 13 21:21:11 server kernel: [7601521.772757] [31811]  1000 31811     5659    
  231      17       3      480             0 bash
Jul 13 21:21:11 server kernel: [7601521.772760] [32333]     0 32333    13237    
  275      31       3      150             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772763] [32548]     0 32548    13071    
  236      31       3      107             0 su
Jul 13 21:21:11 server kernel: [7601521.772766] [32549]     0 32549     6002    
  602      18       3      485             0 bash
Jul 13 21:21:11 server kernel: [7601521.772768] [15204]  1000 15204     5659    
  250      15       3      480             0 bash
Jul 13 21:21:11 server kernel: [7601521.772771] [15502]     0 15502    13237    
  251      32       3      150             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772774] [15664]     0 15664    13071    
  239      31       3      106             0 su
Jul 13 21:21:11 server kernel: [7601521.772776] [15665]     0 15665     6000    
  489      17       3      612             0 bash
Jul 13 21:21:11 server kernel: [7601521.772779] [26831]  1000 26831     5659    
  237      16       3      480             0 bash
Jul 13 21:21:11 server kernel: [7601521.772782] [26941]     0 26941    13237    
  271      30       3      149             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772785] [27717]     0 27717    13071    
  254      30       3      106             0 su
Jul 13 21:21:11 server kernel: [7601521.772788] [27718]     0 27718     5971    
  265      16       3      791             0 bash
Jul 13 21:21:11 server kernel: [7601521.772791] [16855]     0 16855     6066    
  265      18       4      527             0 nano
Jul 13 21:21:11 server kernel: [7601521.772794] [17222]  1000 17222     5659    
  216      16       3      481             0 bash
Jul 13 21:21:11 server kernel: [7601521.772797] [17382]     0 17382    13237    
  254      32       3      150             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772799] [17507]     0 17507    13071    
  226      30       3      106             0 su
Jul 13 21:21:11 server kernel: [7601521.772802] [17508]     0 17508     5949    
  512      17       3      615             0 bash
Jul 13 21:21:11 server kernel: [7601521.772805] [ 2660]     0  2660     6062    
  352      17       3      499             0 nano
Jul 13 21:21:11 server kernel: [7601521.772808] [29154]  1000 29154     5660    
  405      16       3      480             0 bash
Jul 13 21:21:11 server kernel: [7601521.772810] [29319]     0 29319    13238    
  395      32       3      149             0 sudo
Jul 13 21:21:11 server kernel: [7601521.772813] [29558]     0 29558    13072    
  344      31       3      106             0 su
Jul 13 21:21:11 server kernel: [7601521.772816] [29559]     0 29559     5700    
  475      17       3      521             0 bash
Jul 13 21:21:11 server kernel: [7601521.772820] [ 1555]   111  1555  2351888   
912738    2401      12   145630             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772823] [ 5673]   111  5673  1131516   
242334    1262       8   285390             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772826] [ 6107]   111  6107  1789401    
85474     832      10   180301             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772829] [ 6597]   111  6597  1553812   
677006    1931       9   125801             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772832] [ 8814]   111  8814  2357093   
859643    2342      12   169514             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772835] [ 8944]   111  8944  1794141   
469905    1298      11    55631             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772838] [ 9209]   111  9209  1409360   
477185    1411       9    63893             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772842] [ 9587]     0  9587     6228    
  427      19       3      687             0 nano
Jul 13 21:21:11 server kernel: [7601521.772845] [23692]     0 23692    84493    
  919     161       3      573             0 smbd
Jul 13 21:21:11 server kernel: [7601521.772848] [23693]     0 23693    82472    
  266     152       3      578             0 smbd
Jul 13 21:21:11 server kernel: [7601521.772850] [23696]     0 23696    84468    
  519     154       3      562             0 smbd
Jul 13 21:21:11 server kernel: [7601521.772853] [23780]     0 23780    61093    
  841     116       3      390             0 nmbd
Jul 13 21:21:11 server kernel: [7601521.772857] [ 1018]     0  1018     6292    
  510      18       3      729             0 nano
Jul 13 21:21:11 server kernel: [7601521.772859] [ 9919]     0  9919     6293    
  510      19       3      729             0 nano
Jul 13 21:21:11 server kernel: [7601521.772863] [18907]   111 18907  3296045  
2506999    5635      17   138823             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772866] [22378]     0 22378     5964    
  872      16       3       68             0 nano
Jul 13 21:21:11 server kernel: [7601521.772870] [ 9533]     0  9533     3986    
  370      12       3       12             0 agetty
Jul 13 21:21:11 server kernel: [7601521.772873] [23711]   111 23711  1325629   
157601     843       8   115133             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772876] [30526]   111 30526  1500496   
261973     846       9    11664             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772879] [22168]   111 22168  1794945    
67719     918      10   236605             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772883] [ 1736]   111  1736  1246039    
26906     445       8    49225             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772886] [ 8371]   111  8371  1421929   
151860    1074       9   253413             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772889] [25486]   111 25486  1760135   
281997     881      10     5366             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772892] [ 8320]   111  8320  1208369    
63320     439       8    14264             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772895] [15981]   111 15981  1507982    
38789     501      10    45822             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772899] [25823]     0 25823   984933    
12071     106       6        0         -1000 multipathd
Jul 13 21:21:11 server kernel: [7601521.772914] [28932]   111 28932  3778957  
2714270    6748      18   460055             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772917] [ 2369]     0  2369   984614    
 7551      99       7        0         -1000 multipathd
Jul 13 21:21:11 server kernel: [7601521.772920] [ 4340]     0  4340   984622    
 7617      99       7        0         -1000 multipathd
Jul 13 21:21:11 server kernel: [7601521.772925] [13170]     0 13170     6798    
  684      16       3        0             0 screen
Jul 13 21:21:11 server kernel: [7601521.772928] [13172]     0 13172     3133    
  756      11       3        0             0 clone_ext_vms.s
Jul 13 21:21:11 server kernel: [7601521.772931] [15015]   111 15015  1702370    
26705     517      10    75114             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772934] [17093]     0 17093     6798    
  699      17       3        0             0 screen
Jul 13 21:21:11 server kernel: [7601521.772937] [17094]     0 17094     3133    
  755      11       3        0             0 clone_int_vms.s
Jul 13 21:21:11 server kernel: [7601521.772940] [18731]   111 18731  1542275    
31111     513       9    69146             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772943] [ 1348]     0  1348    56751    
 5931      93       3        0             0 python
Jul 13 21:21:11 server kernel: [7601521.772946] [15380]     0 15380    56751    
 5968     101       3        0             0 python
Jul 13 21:21:11 server kernel: [7601521.772950] [22424]     0 22424     1128    
  189       7       3        0             0 sh
Jul 13 21:21:11 server kernel: [7601521.772953] [22425]     0 22425     1874    
  522       9       3        0             0 dd
Jul 13 21:21:11 server kernel: [7601521.772955] [22637]     0 22637     1128    
  191       8       3        0             0 sh
Jul 13 21:21:11 server kernel: [7601521.772958] [22638]     0 22638     1874    
  529      10       3        0             0 dd
Jul 13 21:21:11 server kernel: [7601521.772961] [  494]   111   494  1118467   
795558    1774       7     5489             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772965] [ 9701]   111  9701   352659   
143019     465       4      377             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772968] [15505]   111 15505   352163   
143958     466       4       45             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772971] [22555]   111 22555   352677   
143166     468       4      551             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772974] [30719]   111 30719   352163   
136182     468       5     8139             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772978] [ 2810]   111  2810   352402   
143455     469       5      366             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772981] [12145]   111 12145   483261   
273350     728       5     1164             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772984] [19814]   111 19814   482971   
266878     721       5     3868             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772987] [26246]   111 26246   352145   
138118     467       5     6142             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772990] [30428]   111 30428   321183   
111064     407       4       62             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772993] [ 4157]   111  4157   319631   
110301     401       4       28             0 qemu-system-x86
Jul 13 21:21:11 server kernel: [7601521.772999] Out of memory: Kill process 
28932 (qemu-system-x86) score 88 or sacrifice child
Jul 13 21:21:11 server kernel: [7601521.773461] Killed process 28932 
(qemu-system-x86) total-vm:15115828kB, anon-rss:10846296kB, file-rss:10784kB
Jul 13 21:21:13 server kernel: [7601522.914294] virbr1: port 3(vnet4) entered 
disabled state
Jul 13 21:21:13 server kernel: [7601522.918014] device vnet4 left promiscuous 
mode
Jul 13 21:21:13 server kernel: [7601522.918021] virbr1: port 3(vnet4) entered 
disabled state
Jul 13 21:21:13 server kernel: [7601522.977653] br_int: port 2(vnet3) entered 
disabled state
Jul 13 21:21:13 server kernel: [7601522.980919] device vnet3 left promiscuous 
mode
Jul 13 21:21:13 server kernel: [7601522.980922] br_int: port 2(vnet3) entered 
disabled state
Jul 13 21:21:13 server libvirtd[19115]: internal error: End of file from monitor
Jul 13 21:21:13 server virtlogd[18798]: End of file while reading data: 
Input/output error
Jul 13 21:21:13 server kernel: [7601523.277770] audit: type=1400 
audit(1499977273.477:7810): apparmor="STATUS" operation="profile_remove" 
profile="unconfined" name="libvirt-95871028-9a96-0fe0-0b2a-b1d1252ffa6a" 
pid=28069 comm="apparmor_parser"
Jul 13 21:21:14 server systemd[1]: 
dev-disk-by\x2dlabel-System\x5cx20Reserved.device: Dev 
dev-disk-by\x2dlabel-System\x5cx20Reserved.device appeared twice with different 
sysfs paths /sys/devices/virtual/block/dm-4 and 
/sys/devices/virtual/block/dm-107
Jul 13 21:21:14 server systemd[17952]: 
dev-disk-by\x2dlabel-System\x5cx20Reserved.device: Dev 
dev-disk-by\x2dlabel-System\x5cx20Reserved.device appeared twice with different 
sysfs paths /sys/devices/virtual/block/dm-4 and 
/sys/devices/virtual/block/dm-107
Jul 13 21:23:39 server sm-mta[727]: v6DJ3dUt024808: Warning: program 
/usr/sbin/sensible-mda unsafe: No such file or directory
Jul 13 21:23:39 server sm-mta[727]: v6DJ3dUt024808: SYSERR(root): Cannot exec 
/usr/sbin/sensible-mda: No such file or directory
Jul 13 21:23:39 server sm-mta[726]: v6DJ3dUt024808: 
to=<root@server.domain.local>, delay=01:20:00, xdelay=00:00:00, mailer=local, 
pri=750000, dsn=4.0.0, stat=Operating system error

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https://bugs.launchpad.net/bugs/1702323

Title:
  update-initramfs hangs

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I have a server running version 16.04.1 LTS and kernel 4.4.0-62-generic
  I ran apt-get upgrade and the upgrade process hangs on...
  update-initramfs: Generating /boot/initrd.img-4.4.0-83-generic

  In a separate shell I have tried update-initramfs -u -v and the
  process stops on "Calling hook cryptroot"

  In my /boot/ directory I now have a file
  initrd.img-4.4.0-83-generic.new which is 0Kb in size.

  I do not have any encrypted volumes.

  Please can you suggest how I can get round this error and complete the
  upgrade.

  Many thanks
  Max

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