[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1426092
Title:
virtio-balloon-device locks up Guest
Status in QEMU:
Expired
Bug description:
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 <rmaksud...@parallels.com>
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.
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