This bug was fixed in the package linux - 4.8.0-16.17
---------------
linux (4.8.0-16.17) yakkety; urgency=low
[ Tim Gardner ]
* Release Tracking Bug
- LP: #1626768
* Support ARM GIC ITS in ACPI mode (LP: #1626631)
- [Config] CONFIG_ACPI_IORT=y
- SAUCE: ACPI: I/O Remapping Table (IORT) initial support
- SAUCE: ACPI: Add new IORT functions to support MSI domain handling
- SAUCE: irqchip/gicv3-its: Cleanup for ITS domain initialization
- SAUCE: irqchip/gicv3-its: Refactor ITS DT init code to prepare for ACPI
- SAUCE: irqchip/gicv3-its: Probe ITS in the ACPI way
- SAUCE: irqchip/gicv3-its: Factor out PCI-MSI part that might be reused
for ACPI
- SAUCE: irqchip/gicv3-its: Use MADT ITS subtable to do PCI/MSI domain
initialization
- SAUCE: PCI/MSI: Setup MSI domain on a per-device basis using IORT ACPI
table
* 4.8 dropped CONFIG_ATA=y (breaks systemd's TEST-08-ISSUE-2730 upstream test)
(LP: #1626394)
- [Config] CONFIG_ATA=y
* Yakkety: Enable drivers with respect to Xenial (LP: #1626543)
- [Config] CONFIG_VMD=m
- [Config] CONFIG_MAC80211_RC_MINSTREL_VHT=y for all arches
- [Config] CONFIG_OF=y for all arches
- [Config] CONFIG_BLK_DEV_NVME_SCSI=y
- [Config] Xenial device settings sync with amd64
- [Config] Xenial device settings sync with i386
- [Config] CONFIG_MTD_UBI_GLUEBI=m
- [Config] Xenial device settings sync with armhf
- [Config] Xenial device settings sync with arm64
* yakkety 4.8, missing config CONFIG_USERFAULTFD=y (LP: #1626149)
- [Config] CONFIG_USERFAULTFD=y
* 4.8 regression: SLAB is being used instead of SLUB (LP: #1626564)
- [Config] CONFIG_SLUB=y
* image won't boot after upgrading to yakkety's 4.8 kernel because efi
(LP: #1626158)
- add nls_cp437 to the generic.inclusion-list
-- Tim Gardner <tim.gard...@canonical.com> Thu, 22 Sep 2016 06:51:45
-0600
** Changed in: linux (Ubuntu Yakkety)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1626564
Title:
4.8 regression: SLAB is being used instead of SLUB
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Yakkety:
Fix Released
Bug description:
We're seeing hundreds of kernel worker threads being spawned with some
actions, for example, after booting the desktop and hutting the
brightness keys causes this. On investigation, this occurs when
CONFIG_SLAB is being used.
1. Ubuntu traditionally uses CONFIG_SLUB, so we should use that instead of
CONFIG_SLAB (why was it changed for Yakkety?)
2. With CONFIG_SLUB I cannot reproduce the issue of the hundreds for worker
threads
3 CONFIG_SLUB seems more performant on the boot too over SLAB.
Please re-enable the CONFIG_SLUB allocator as per the 4.4. Xenial
configs.
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