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Message #137390
[Bug 1498206] Re: Fix CPU lockup on Hyper-V/Azure
This bug was fixed in the package linux - 4.2.0-12.14
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linux (4.2.0-12.14) wily; urgency=low
[ Tim Gardner ]
* Release Tracking Bug
- LP: #1499712
[ Ben Pope ]
* SAUCE: drivers/net/ethernet/atheros/alx: Add Killer E2400 device ID
- LP: #1498633
[ Knuth Posern ]
* SAUCE: thunderbolt: Allow loading of module on recent Apple MacBooks
with thunderbolt 2 controller
- LP: #1497321
[ Laurent Dufour ]
* SAUCE: powerpc/hvsi: Fix endianness issues in the HVSI driver
- LP: #1499357
[ Upstream Kernel Changes ]
* x86/hyperv: Mark the Hyper-V TSC as unstable
- LP: #1498206
* intel_pstate: fix PCT_TO_HWP macro
- LP: #1499040
* perf/x86/intel/rapl: Add support for Knights Landing (KNL)
- LP: #1461370
* drm/i915: Add audio pin sense / ELD callback
- LP: #1398277
* drm/i915: Call audio pin/ELD notify function
- LP: #1398277
* ALSA: hda - allow codecs to access the i915 pin/ELD callback
- LP: #1398277
* ALSA: hda - Wake the codec up on pin/ELD notify events
- LP: #1398277
* drm/i915: Add locks around audio component bind/unbind
- LP: #1398277
* drm/i915: Drop port_mst_index parameter from pin/eld callback
- LP: #1398277
-- Tim Gardner <tim.gardner@xxxxxxxxxxxxx> Thu, 24 Sep 2015 09:19:23
-0600
** Changed in: linux (Ubuntu Wily)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1498206
Title:
Fix CPU lockup on Hyper-V/Azure
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
In Progress
Status in linux source package in Vivid:
In Progress
Status in linux source package in Wily:
Fix Released
Bug description:
Description of problem:
Large sized VMs with 32 VCPUs and more than 100G memory sometimes hang at boot, and the console keeps printing logs like "soft lockup - CPU#14 stuck for 23s!"
This particular issue can be resolved with the following patch upstream:
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/arch/x86/kernel/cpu?id=88c9281a9fba67636ab26c1fd6afbc78a632374f
Repro rate is low. To repro, provision a larger VM (i.e. G5 VM on
Azure) and reboot many times, monitoring the console until the "soft
lockup - CPU" error is seen.
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References