This bug was fixed in the package linux - 4.10.0-38.42
---------------
linux (4.10.0-38.42) zesty; urgency=low
* linux: 4.10.0-38.42 -proposed tracker (LP: #1722330)
* Controller lockup detected on ProLiant DL380 Gen9 with P440 Controller
(LP: #1720359)
- scsi: hpsa: limit transfer length to 1MB
* [Dell Docking IE][0bda:8153] Realtek USB Ethernet leads to system hang
(LP: #1720977)
- r8152: fix the list rx_done may be used without initialization
* Touchpad not detected in Lenovo X1 Yoga / Yoga 720-15IKB (LP: #1700657)
- mfd: intel-lpss: Add missing PCI ID for Intel Sunrise Point LPSS devices
* Add installer support for Broadcom BCM573xx network drivers. (LP: #1720466)
- d-i: Add bnxt_en to nic-modules.
* CVE-2017-1000252
- KVM: VMX: Do not BUG() on out-of-bounds guest IRQ
* CVE-2017-10663
- f2fs: sanity check checkpoint segno and blkoff
* xfstest sanity checks on seek operations fails (LP: #1696049)
- xfs: fix off-by-one on max nr_pages in xfs_find_get_desired_pgoff()
* [P9, Power NV][ WSP][Ubuntu 16.04.03] : perf hw breakpoint command results
in call traces and system goes for reboot. (LP: #1706033)
- powerpc/64s: Handle data breakpoints in Radix mode
* 5U84 - ses driver isn't binding right - cannot blink lights on 1 of the 2
5u84 (LP: #1693369)
- scsi: ses: do not add a device to an enclosure if enclosure_add_links()
fails.
* Vlun resize request could fail with cxlflash driver (LP: #1713575)
- scsi: cxlflash: Fix vlun resize failure in the shrink path
* More migrations with constant load (LP: #1713576)
- sched/fair: Prefer sibiling only if local group is under-utilized
* New PMU fixes for marked events. (LP: #1716491)
- powerpc/perf: POWER9 PMU stops after idle workaround
* CVE-2017-14340
- xfs: XFS_IS_REALTIME_INODE() should be false if no rt device present
* [Zesty][Yakkety] rtl8192e bug fixes (LP: #1698470)
- staging: rtl8192e: rtl92e_fill_tx_desc fix write to mapped out memory.
- staging: rtl8192e: fix 2 byte alignment of register BSSIDR.
- staging: rtl8192e: rtl92e_get_eeprom_size Fix read size of EPROM_CMD.
- staging: rtl8192e: GetTs Fix invalid TID 7 warning.
* Stranded with ENODEV after mdadm --readonly (LP: #1706243)
- md: MD_CLOSING needs to be cleared after called md_set_readonly or
do_md_stop
* multipath -ll is not showing the disks which are actually multipath
(LP: #1718397)
- fs: aio: fix the increment of aio-nr and counting against aio-max-nr
* ETPS/2 Elantech Touchpad inconsistently detected (Gigabyte P57W laptop)
(LP: #1594214)
- Input: i8042 - add Gigabyte P57 to the keyboard reset table
* CVE-2017-10911
- xen-blkback: don't leak stack data via response ring
* CVE-2017-11176
- mqueue: fix a use-after-free in sys_mq_notify()
* implement 'complain mode' in seccomp for developer mode with snaps
(LP: #1567597)
- Revert "UBUNTU: SAUCE: seccomp: log actions even when audit is disabled"
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Action to log before allowing
* implement errno action logging in seccomp for strict mode with snaps
(LP: #1721676)
- Revert "UBUNTU: SAUCE: seccomp: log actions even when audit is disabled"
- seccomp: Provide matching filter for introspection
- seccomp: Sysctl to display available actions
- seccomp: Operation for checking if an action is available
- seccomp: Sysctl to configure actions that are allowed to be logged
- seccomp: Selftest for detection of filter flag support
- seccomp: Filter flag to log all actions except SECCOMP_RET_ALLOW
* Backport recent bbr bugfixes to 4.10 kernel (LP: #1708604)
- tcp_bbr: cut pacing rate only if filled pipe
- tcp_bbr: introduce bbr_bw_to_pacing_rate() helper
- tcp_bbr: introduce bbr_init_pacing_rate_from_rtt() helper
- tcp_bbr: remove sk_pacing_rate=0 transient during init
- tcp_bbr: init pacing rate on first RTT sample
* [SRU][Zesty] Fix lscpu segfault on ARM64 with SMBIOS v2.0 (LP: #1716483)
- arm64: kernel: restrict /dev/mem read() calls to linear region
-- Kleber Sacilotto de Souza <kleber.so...@canonical.com> Tue, 10 Oct
2017 13:49:34 +0200
** Changed in: linux (Ubuntu Zesty)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2017-1000252
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-10663
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-10911
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-11176
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2017-14340
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https://bugs.launchpad.net/bugs/1713576
Title:
More migrations with constant load
Status in The Ubuntu-power-systems project:
In Progress
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Zesty:
Fix Released
Bug description:
== SRU Justification ==
There is a significantly higher number of task migrations when the load is
fixed and not balanced across cores.
Benchmark results are posted in the bug description and in the commits
git log.
This bug is resolved by mainline commit
05b40e057734811ce452344fb3690d09965a7b6a, which is
in mailine as of 4.12-rc1.
== Fix ==
commit 05b40e057734811ce452344fb3690d09965a7b6a
Author: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
Date: Wed Mar 22 23:27:50 2017 +0530
sched/fair: Prefer sibiling only if local group is under-utilized
== Regression Potential ==
Medium, since this commit does touch the scheduler. However, the commit only
makes a change to
allow a local group to pull a task, if the source group has more number of
tasks than the local group.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
== Comment: #0 - PUVICHAKRAVARTHY RAMACHANDRAN - 2017-08-06 13:44:45 ==
---Problem Description---
Significantly higher number of task migrations when the load is fixed but not
balanced across cores.
---uname output---
Linux isvbos3 4.10.0-29-generic #33~16.04.1-Ubuntu SMP Tue Jul 25 18:17:06
UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
---Additional Hardware Info---
Power9 dd2.0
Machine Type = Power9
---Steps to Reproduce---
Benchmark : Multithreaded - cpu intensive. The system had 2 socket/ 32
cores/ SMT4 mode.
When 64 threads was run - the migrations were less over 10s interval.
when 80 threads were run - the migrations were very high.
Ideally, it should have been very minimal, as the over all load was
constant
== Comment: #3 - SRIKAR DRONAMRAJU - 2017-08-11 06:56:47 ==
As suspected (commit : 05b40e0577 : "sched/fair: Prefer sibiling only if
local group is under-utilized")
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=05b40e0577
should fix the problem
Ran ' perf stat -a -r 5 -e sched:sched_migrate_task
/home/srikar/work/ebizzy-0.3/ebizzy -t 35 -S 100'
to detect the problem and verify the fix
Here is perf stat without fix.
Performance counter stats for 'system wide' (5 runs):
7,758 sched:sched_migrate_task
( +- 1.28% )
100.015658079 seconds time elapsed
( +- 0.00% )
perf stat with fix.
Performance counter stats for 'system wide' (5 runs):
415 sched:sched_migrate_task
( +- 11.74% )
100.016021787 seconds time elapsed
( +- 0.00% )
git describe on upstream kernel says v4.11-rc2
# git describe 05b40e0577
v4.11-rc2-227-g05b40e0
== Comment: #4 - SRIKAR DRONAMRAJU - 2017-08-11 07:05:37 ==
Attaching the patch that needs to be applied to fix this bug.
Verified that patch fixes the problem.
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