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: GW 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] 0286
093bb360 8801519abaf0 813f7c63
Jul 13 21:21:11 server kernel: [7601521.772342] 8801519abcc8
88102a8a1c00 8801519abb60 8120ad4e
Jul 13 21:21:11 server kernel: [7601521.772346] 0015
8820357d2f00 880bff851c00
Jul 13 21:21:11 server kernel: [7601521.772350] Call Trace:
Jul 13 21:21:11 server kernel: [7601521.772361] []
dump_stack+0x63/0x90
Jul 13 21:21:11 server kernel: [7601521.772369] []
dump_header+0x5a/0x1c5
Jul 13 21:21:11 server kernel: [7601521.772376] [] ?
apparmor_capable+0xc4/0x1b0
Jul 13 21:21:11 server kernel: [7601521.772383] []
oom_kill_process+0x202/0x3c0
Jul 13 21:21:11 server kernel: [7601521.772386] []
out_of_memory+0x219/0x460
Jul 13 21:21:11 server kernel: [7601521.772392] []
__alloc_pages_slowpath.constprop.88+0x8fd/0xa70
Jul 13 21:21:11 server kernel: [7601521.772396] []
__alloc_pages_nodemask+0x286/0x2a0
Jul 13 21:21:11 server kernel: [7601521.772401] []
alloc_kmem_pages_node+0x4b/0xc0
Jul 13 21:21:11 server kernel: [7601521.772408] []
copy_process+0x1be/0x1b70
Jul 13 21:21:11 server kernel: [7601521.772415] [] ?
handle_mm_fault+0xbc3/0x1820
Jul 13 21:21:11 server kernel: [7601521.772423] [] ?
do_futex+0x107/0x540
Jul 13 21:21:11 server kernel: [7601521.772426] []
_do_fork+0x80/0x360
Jul 13 21:21:11 server kernel: [7601521.772433] [] ?
sigprocmask+0x6f/0xa0
Jul 13 21:21:11 server kernel: [7601521.772436] []
SyS_clone+0x19/0x20
Jul 13 21:21:11 server kernel: [7601521.772444] []
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