------- Comment From sthou...@in.ibm.com 2019-05-07 02:33 EDT-------
Anju , please check if both patches are needed to fix this issue.

------- Comment From sthou...@in.ibm.com 2019-05-07 04:59 EDT-------
(In reply to comment #58)
> (In reply to comment #57)
> > Anju , please check if both patches are needed to fix this issue.
>
> yes, both may be needed, as the grouping of events with perf-fuzzer can
> happen in any way.

Based on the developer response both the patches are needed to fix this
issue.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5aa04b3eb6fca63d2e9827be656dcadc26d54e11

https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=7ccc4fe5ff9e3a134e863beed0dba18a5e511659

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https://bugs.launchpad.net/bugs/1752002

Title:
  [P9,POwer NV][WSP][DD2.1][Ubuntu 1804][Perf fuzzer] : Call trace is
  seen while running perf fuzzer (perf:)

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Released

Bug description:
  == Comment: #0 - Shriya R. Kulkarni <shriy...@in.ibm.com> - 2018-02-02 
01:21:36 ==
  Problem Description :
  =============

  Warn on message is seen while running perf fuzzer tests.

  Machine details :
  ==========
  Hardware : Witherspoon (wsp12) + DD2.1
  OS : Ubuntu 1804
  uname -a : 4.13.0-32-generic #35~lp1746225 ( Kernel from the bug : 
https://bugzilla.linux.ibm.com/show_bug.cgi?id=164107#c7 )

  
  Steps to reproduce :
  ============
  Build Kernel :
  --------------------
  To avoid the kernel crash due to Perf fuzzer , use the kernel mentioned in 
the link : https://bugzilla.linux.ibm.com/show_bug.cgi?id=164107#c7

  #! /bin/bash
  set -x
  git clone https://github.com/deater/perf_event_tests.git
  cd perf_event_tests/include
  mkdir asm
  cd asm
  wget http://9.114.13.132/repo/shriya/perf_regs.h
  cd ../../lib
  make
  sleep 10
  cd ../fuzzer
  make
  sleep 10

  echo 0 > /proc/sys/kernel/nmi_watchdog
  echo 2 > /proc/sys/kernel/perf_event_paranoid
  echo 100000 > /proc/sys/kernel/perf_event_max_sample_rate
  ./perf_fuzzer -r 1492143527

  
  Call trace :
  =======
  [  329.228031] ------------[ cut here ]------------
  [  329.228039] WARNING: CPU: 43 PID: 9088 at 
/home/jsalisbury/bugs/lp1746225/ubuntu-artful/kernel/events/core.c:3038 
perf_pmu_sched_task+0x170/0x180
  [  329.228040] Modules linked in: ofpart at24 uio_pdrv_genirq uio cmdlinepart 
powernv_flash mtd ipmi_powernv vmx_crypto ipmi_devintf ipmi_msghandler 
ibmpowernv opal_prd crct10dif_vpmsum sch_fq_codel ip_tables x_tables autofs4 
crc32c_vpmsum lpfc ast i2c_algo_bit drm_kms_helper syscopyarea sysfillrect 
sysimgblt mlx5_core fb_sys_fops ttm tg3 nvmet_fc drm ahci nvmet nvme_fc libahci 
nvme_fabrics mlxfw nvme_core devlink scsi_transport_fc
  [  329.228068] CPU: 43 PID: 9088 Comm: perf_fuzzer Not tainted 
4.13.0-32-generic #35~lp1746225
  [  329.228070] task: c000003f776ac900 task.stack: c000003f77728000
  [  329.228071] NIP: c000000000299b70 LR: c0000000002a4534 CTR: 
c00000000029bb80
  [  329.228073] REGS: c000003f7772b760 TRAP: 0700   Not tainted  
(4.13.0-32-generic)
  [  329.228073] MSR: 900000000282b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE>
  [  329.228079]   CR: 24008822  XER: 00000000
  [  329.228080] CFAR: c000000000299a70 SOFTE: 0 
                 GPR00: c0000000002a4534 c000003f7772b9e0 c000000001606200 
c000003fef858908 
                 GPR04: c000003f776ac900 0000000000000001 ffffffffffffffff 
0000003fee730000 
                 GPR08: 0000000000000000 0000000000000000 c0000000011220d8 
0000000000000002 
                 GPR12: c00000000029bb80 c000000007a3d900 0000000000000000 
0000000000000000 
                 GPR16: 0000000000000000 0000000000000000 0000000000000000 
0000000000000000 
                 GPR20: 0000000000000000 0000000000000000 c000003f776ad090 
c000000000c71354 
                 GPR24: c000003fef716780 0000003fee730000 c000003fe69d4200 
c000003f776ad330 
                 GPR28: c0000000011220d8 0000000000000001 c0000000014c6108 
c000003fef858900 
  [  329.228098] NIP [c000000000299b70] perf_pmu_sched_task+0x170/0x180
  [  329.228100] LR [c0000000002a4534] __perf_event_task_sched_in+0xc4/0x230
  [  329.228101] Call Trace:
  [  329.228102] [c000003f7772b9e0] [c0000000002a0678] 
perf_iterate_sb+0x158/0x2a0 (unreliable)
  [  329.228105] [c000003f7772ba30] [c0000000002a4534] 
__perf_event_task_sched_in+0xc4/0x230
  [  329.228107] [c000003f7772bab0] [c0000000001396dc] 
finish_task_switch+0x21c/0x310
  [  329.228109] [c000003f7772bb60] [c000000000c71354] __schedule+0x304/0xb80
  [  329.228111] [c000003f7772bc40] [c000000000c71c10] schedule+0x40/0xc0
  [  329.228113] [c000003f7772bc60] [c0000000001033f4] do_wait+0x254/0x2e0
  [  329.228115] [c000003f7772bcd0] [c000000000104ac0] kernel_wait4+0xa0/0x1a0
  [  329.228117] [c000003f7772bd70] [c000000000104c24] SyS_wait4+0x64/0xc0
  [  329.228121] [c000003f7772be30] [c00000000000b184] system_call+0x58/0x6c
  [  329.228121] Instruction dump:
  [  329.228123] 3beafea0 7faa4800 409eff18 e8010060 eb610028 ebc10040 7c0803a6 
38210050 
  [  329.228127] eb81ffe0 eba1ffe8 ebe1fff8 4e800020 <0fe00000> 4bffffbc 
60000000 60420000 
  [  329.228131] ---[ end trace 8c46856d314c1811 ]---
  [  375.755943] hrtimer: interrupt took 31601 ns

  == Comment: #4 - SEETEENA THOUFEEK <sthou...@in.ibm.com> - 2018-02-05
  06:34:09 ==

  
  == Comment: #5 - SEETEENA THOUFEEK <sthou...@in.ibm.com> - 2018-02-05 
06:36:12 ==
  We have similar issue reported on different distro where Anju Provided the 
patch. Patch attached above. 
  . 
  Will check with her if that patch got accepted upstream

  == Comment: #14 - SEETEENA THOUFEEK <sthou...@in.ibm.com> - 2018-02-23
  01:52:50 ==

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