** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1746225
Title:
[P9,Power NV][WSP][Ubuntu 1804] : "Kernel access of bad area " when
grouping different pmu events using perf fuzzer . (perf:)
Status in The Ubuntu-power-systems project:
Fix Committed
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Artful:
Fix Committed
Status in linux source package in Bionic:
Fix Released
Bug description:
== SRU Justification ==
Due to this bug, perf fuzzer resulted in crash and system goes for a reboot
and results in a call trace shown in the bug. It is due to grouping of
different PMU events, which is fixed by mainline commit
5aa04b3eb6fca63d2e9827be656dcadc26d54e1
Commit 5aa04b3eb6fca63d2e9827be656dcadc26d54e11 is in mailine as of
v4.15-rc5.
== Fix ==
commit 5aa04b3eb6fca63d2e9827be656dcadc26d54e11
Author: Ravi Bangoria <ravi.bango...@linux.vnet.ibm.com>
Date: Thu Nov 30 14:03:22 2017 +0530
powerpc/perf: Fix oops when grouping different pmu events
== Regression Potential ==
Low. This fix is specific to powerpc.
== 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.
==Original Bug Description==
== Comment: #0 - Shriya R. Kulkarni <shriy...@in.ibm.com> - 2018-01-30
03:24:47 ==
Problem Description :
==============
Perf fuzzer resulted in crash and system goes for reboot and the call trace
is shown below . It is due to grouping of different PMU events.
Machine details :
==========
OS : Ubuntu 1804
uname -r : 4.13.0-25-generic
system : Witherspoon + DD2.1
perf -v : perf version 4.13.13
ltc-wspoon12 login: [78592.995848] Unable to handle kernel paging request for
instruction fetch
[78592.995914] Faulting instruction address: 0x00000000
[78592.995950] Oops: Kernel access of bad area, sig: 11 [#1]
[78592.995982] SMP NR_CPUS=2048
[78592.995985] NUMA
[78592.996011] PowerNV
[78592.996045] Modules linked in: vmx_crypto idt_89hpesx crct10dif_vpmsum
at24 ofpart uio_pdrv_genirq uio cmdlinepart powernv_flash mtd ibmpowernv
opal_prd ipmi_powernv ipmi_devintf ipmi_msghandler sch_fq_codel ip_tables
x_tables autofs4 nouveau lpfc ast i2c_algo_bit crc32c_vpmsum ttm drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops drm mlx5_core nvmet_fc nvmet tg3
nvme_fc nvme_fabrics ahci nvme_core libahci mlxfw devlink scsi_transport_fc
[78592.996367] CPU: 69 PID: 6010 Comm: perf_fuzzer Tainted: G W
4.13.0-25-generic #29-Ubuntu
[78592.996422] task: c000003f77b5b500 task.stack: c000003d0b0c8000
[78592.996462] NIP: 0000000000000000 LR: c0000000000e9b1c CTR:
0000000000000000
[78592.996509] REGS: c000003d0b0cb780 TRAP: 0400 Tainted: G W
(4.13.0-25-generic)
[78592.996562] MSR: 9000000040009033 <SF,HV,EE,ME,IR,DR,RI,LE>
[78592.996588] CR: 48002874 XER: 00000000
[78592.996642] CFAR: c0000000000e9b18 SOFTE: 1
[78592.996642] GPR00: c0000000000eb128 c000003d0b0cba00 c0000000015f6200
0000000000000000
[78592.996642] GPR04: c000003d0b0cbba0 c000003d0b0cbc20 0000000000000002
c000000001596b10
[78592.996642] GPR08: 0000000000000002 0000000000000000 c000000001596b10
c000003fecad0028
[78592.996642] GPR12: 0000000000000000 c000000007a8d480 0000000000000000
0000000000000000
[78592.996642] GPR16: 0000000000000000 0000000000000000 0000000000000000
0000000000000000
[78592.996642] GPR20: 0000000000000001 c000003d0b0cbc1c c000003d0b0cbc24
c000003d0b0cbb98
[78592.996642] GPR24: c000003d0b0cbba0 c000003d0b0cbc20 0000000000001555
c000003fefeb4ea0
[78592.996642] GPR28: c000003d0b0cbc20 0000000000000002 0000000000003000
c000003fefeb5190
[78592.997170] NIP [0000000000000000] (null)
[78592.997208] LR [c0000000000e9b1c] power_check_constraints+0x13c/0x5a0
[78592.997247] Call Trace:
[78592.997267] [c000003d0b0cba00] [c000003d0b0cbaa0] 0xc000003d0b0cbaa0
(unreliable)
[78592.997321] [c000003d0b0cbb80] [c0000000000eb128]
power_pmu_event_init+0x298/0x6a0
[78592.997373] [c000003d0b0cbc70] [c00000000029e6b4]
perf_try_init_event+0xd4/0x120
[78592.997424] [c000003d0b0cbcb0] [c0000000002a1038]
perf_event_alloc.part.23+0x7b8/0xb90
[78592.997475] [c000003d0b0cbd30] [c0000000002aa0dc]
SyS_perf_event_open+0x69c/0xfa0
[78592.997527] [c000003d0b0cbe30] [c00000000000b184] system_call+0x58/0x6c
[78592.997568] Instruction dump:
[78592.997597] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX
[78592.997664] XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
XXXXXXXX
[78592.997733] ---[ end trace 57fb7542c4083583 ]---
[78594.008780]
[78594.008932] Sending IP[78773.335857584,5] OPAL: Switch to big-endian OS
I to other CPUs
[78594.01029
Steps to reproduce :
============
#! /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
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