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+kernel: 0.878
+PID: 0.819
+device: 0.807
+boot: 0.780
+performance: 0.776
+graphic: 0.750
+architecture: 0.725
+x86: 0.724
+arm: 0.709
+ppc: 0.642
+socket: 0.619
+vnc: 0.567
+debug: 0.529
+network: 0.527
+semantic: 0.492
+register: 0.482
+permissions: 0.473
+user-level: 0.470
+i386: 0.466
+TCG: 0.451
+hypervisor: 0.444
+VMM: 0.415
+peripherals: 0.398
+risc-v: 0.390
+virtual: 0.347
+mistranslation: 0.329
+assembly: 0.248
+KVM: 0.230
+files: 0.163
+
+virtio-balloon-device locks up Guest
+
+Setting arbitrary balloon target values locks up the guest in some cases crashes it, if the target memory is < used +~5% free.  
+Found while testing aggressive memory over-commit, scenarios.
+You get messages like:
+
+[  155.827448] [<c002060c>] (show_stack) from [<c041c518>] (dump_stack+0x6c/0x88)
+[  155.837076] [<c041c518>] (dump_stack) from [<c0091994>] (warn_alloc_failed+0xe0/0x120)
+[  155.847075] [<c0091994>] (warn_alloc_failed) from [<c0094480>] (__alloc_pages_nodemask+0x600/0x91c)
+[  155.859039] [<c0094480>] (__alloc_pages_nodemask) from [<c00da414>] (balloon_page_enqueue+0x20/0xbc)
+[  155.870556] [<c00da414>] (balloon_page_enqueue) from [<c025d794>] (balloon+0x140/0x2cc)
+[  155.881377] [<c025d794>] (balloon) from [<c0043b38>] (kthread+0xd8/0xf4)
+
+page dumped bacause: nonzero _count
+BUG: BAad page state in process Xorg pfn:396e5
+
+Test Environment:
+x86_64
+Ubuntu 13.10, Guest Linux Kernel 3.19, qemu 2.2.0 with following patches applied - balloon OOM enhancement
+commit 5a10b7dbf904bfe01bb9fcc6298f7df09eed77d5
+Author: Raushaniya Maksudova <email address hidden>
+
+Boot guest with '-balloon virtio', -qmp .... -hmp access
+1. sudo info balloon | socat - tcp4-connect:127.0.0.1:4444
+   - or over qmp interface
+{"execute":"qom-get", "arguments": { "path": "/machine/peripheral-anon/device[1]","property": "guest-stats" }}
+{"return": {"stats": {"stat-swap-out": 0, "stat-free-memory": 513454080, "stat-minor-faults": 1261, "stat-major-faults": 0, "stat-total-memory": 526073856, "stat-swap-in": 0}, "last-update": 11109}}
+
+2. Take memory down check free memory using (1)
+3. Issue "sudo echo balloon XXX | socat - tcp4-connect:127.0.0.1:4444" - XXX is value in threshold mentioned above
+   and you get Guest lockup
+
+ARM - samething except '-device virtio-balloon-device' used
+
+Libvirt - virsh setmem causes same issue.
+
+Looking through old bug tickets... can you still reproduce this issue with the latest version of QEMU? ... anyway, this rather sounds like a bug with the guest kernel to me, so in case this problem persists, you likely should report this in the kernel bug tracker instead.
+
+[Expired for QEMU because there has been no activity for 60 days.]
+