group.of.nepali.translators team mailing list archive

[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

*** This bug is a duplicate of bug 1627730 ***
    https://bugs.launchpad.net/bugs/1627730

commit 135e8c9250dd ("sched/core: Fix a race between try_to_wake_up()
and a woken up task") was released as part of v4.4.22 which will be
included in the upcoming Xenial SRU cycle, Ubuntu-4.4.0-42.62 or higher.

** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Fix Committed

** Changed in: linux (Ubuntu Yakkety)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Yakkety)
     Assignee: Taco Screen team (taco-screen-team) => (unassigned)

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https://bugs.launchpad.net/bugs/1629872

Title:
  ISST-LTE:pNV:cap: Call traces dumping continuously after 10+ hours of
  regression with Leaf IO and SMT tests with SMT fix

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  Description:
  ------------
  Call traces dumping continuously with Leaf IO and SMT tests with SMT fix (140718) after 10+ hours of regression run and not able to get the prompt.

  Steps to re-create:
  ------------------
  > cap installed with latest ubuntu160401 kernel ,4.4.0-38-generic.

  > Applied SMT kernel patch on system cap for issue:140718

  root@cap:~# ls -l
  total 56572
  -rw-r--r-- 1 root root 18838772 Sep 22 12:24 linux-image-4.4.0-21-generic_4.4.0-21.37+smt_ppc64el.deb
  -rw-r--r-- 1 root root 39081588 Sep 22 12:24 linux-image-extra-4.4.0-21-generic_4.4.0-21.37+smt_ppc64el.deb
  -rw------- 1 root root       70 Sep 21 04:24 nohup.out

  > Booted with above kernel

  root@cap:~# uname -a
  Linux cap 4.4.0-21-generic #37+smt SMP Mon Aug 29 15:07:28 CDT 2016 ppc64le ppc64le ppc64le GNU/Linux
  root@cap:~# uname -r
  4.4.0-21-generic

  > Enabled sysrq and also xmon before starting tests

  root@cap:~# cat /proc/sys/kernel/sysrq
  1
  root@cap:~# cat /proc/cmdline
  root=UUID=4114e1ef-5e30-45ae-a5fb-a5429946434c ro xmon=on splash quiet crashkernel=384M-:128M

  > root@cap:~/fix_140718# ppc64_cpu --smt
  SMT=8

  > Started tests with Leaf IO and SMT. After 10+ hours of run, ipmi console dumping call traces continuously and not able to get the prompt.
     ssh cap is hung, ping cap is working fine 

  [ipjoga@kte ~]$ ssh root@cap

  
  ipjoga@kte ~]$ ping cap
  PING cap.isst.aus.stglabs.ibm.com (10.33.17.16) 56(84) bytes of data.
  64 bytes from cap.isst.aus.stglabs.ibm.com (10.33.17.16): icmp_seq=1 ttl=64 time=0.095 ms
  64 bytes from cap.isst.aus.stglabs.ibm.com (10.33.17.16): icmp_seq=2 ttl=64 time=0.055 ms
  ^C
   
  > Attached Call traces 

  > Also memory in this system is

  oot@cap:/kte/tools/setup.d# free -h
                total        used        free      shared  buff/cache   available
  Mem:           1.0T        4.4G        1.0T         37M        9.4G        1.0T
  Swap:           37G          0B         37G
  root@cap:/kte/tools/setup.d# 

  				      
  UBUNTU  BUILD:                         4.4.0-38-generic

  SL Firmware Version :                  IBM-garrison-ibm-OP8_v1.10_2.17

  IO team thinks this is related/fixed by commit 135e8c9250dd
  ("sched/core: Fix a race between try_to_wake_up() and a woken up
  task").    We built a kernel with that patch applied and asked indira
  to restart the tests.

  Developer provided the fix for above issue . Applied it and restarted
  Leaf IO and SMT tests which has both SMT fix and Memory barrier fix.

  root@cap:~# uname -r
  4.4.0-38.58+ibm-smt1-generic

  Run went fine for more than 60+ hours without any system hang.

  Canonical, we believe the following issue to be fixed by:

  commit 135e8c9250dd ("sched/core: Fix a race between try_to_wake_up()
  and a woken up task")

  Which was marked to the -stable tree.  Can you pull it into your
  kernel?

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