------- Comment From shriy...@in.ibm.com 2018-02-22 03:43 EDT------- Hi , Can you please let us know in which build we are expecting the fix ?
Thanks -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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: In Progress Status in linux package in Ubuntu: Fix Committed Status in linux source package in Artful: In Progress Status in linux source package in Bionic: Fix Committed 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  (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://220.127.116.11/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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1746225/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp