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Message-ID: <e92a703d-6a92-474c-acba-b15176b97548@linux.intel.com>
Date: Mon, 8 Sep 2025 17:05:24 +0800
From: "Mi, Dapeng" <dapeng1.mi@...ux.intel.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com,
Kan Liang <kan.liang@...ux.intel.com>, linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>, Eranian Stephane <eranian@...gle.com>,
Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [Patch v7 02/12] perf/x86/intel: Fix NULL event access and
potential PEBS record loss
On 9/8/2025 4:43 PM, kernel test robot wrote:
> Hello,
>
> kernel test robot noticed "WARNING:at_arch/x86/events/intel/ds.c:#intel_pmu_drain_pebs_nhm" on:
>
> commit: a7138973beb1d124386472663cf50a571a2059ce ("[Patch v7 02/12] perf/x86/intel: Fix NULL event access and potential PEBS record loss")
> url: https://github.com/intel-lab-lkp/linux/commits/Dapeng-Mi/perf-x86-Remove-redundant-is_x86_event-prototype/20250828-094117
> patch link: https://lore.kernel.org/all/20250828013435.1528459-3-dapeng1.mi@linux.intel.com/
> patch subject: [Patch v7 02/12] perf/x86/intel: Fix NULL event access and potential PEBS record loss
>
> in testcase: phoronix-test-suite
> version:
> with following parameters:
>
> test: stress-ng-1.11.0
> option_a: Socket Activity
> cpufreq_governor: performance
>
>
>
> config: x86_64-rhel-9.4
> compiler: gcc-12
> test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz (Cascade Lake) with 512G memory
>
> (please refer to attached dmesg/kmsg for entire log/backtrace)
>
>
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@...el.com>
> | Closes: https://lore.kernel.org/oe-lkp/202509081646.d101cfb7-lkp@intel.com
>
>
>
> The kernel config and materials to reproduce are available at:
> https://download.01.org/0day-ci/archive/20250908/202509081646.d101cfb7-lkp@intel.com
>
>
> the dmesg in above link is not very clear, so we also attached one dmesg FYI,
> from which:
>
> [ 41.225784][ C82] ------------[ cut here ]------------
> [ 41.225786][ C82] WARNING: CPU: 82 PID: 3704 at arch/x86/events/intel/ds.c:2592 intel_pmu_drain_pebs_nhm+0x56b/0x630
> [ 41.225791][ C82] Modules linked in: xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
> xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge stp llc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio qrtr sg binfmt_misc loop fus
> e dm_mod overlay btrfs blake2b_generic xor raid6_pq intel_rapl_msr intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common skx_edac skx_eda
> c_common nfit libnvdimm x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irdma sd_mod ast irqbypass ice ipmi_ssif drm_client_lib snd_pcm ghash
> _clmulni_intel drm_shmem_helper snd_timer gnss rapl drm_kms_helper intel_cstate snd ahci ib_uverbs libahci mei_me soundcore acpi_power_meter i2c_i801 ioat
> dma drm ib_core pcspkr intel_uncore ipmi_si acpi_ipmi libata mei joydev i2c_smbus intel_pch_thermal lpc_ich dca wmi ipmi_devintf ipmi_msghandler acpi_pad
> [ 41.225831][ C82] CPU: 82 UID: 0 PID: 3704 Comm: sleep Tainted: G S 6.17.0-rc1-00052-ga7138973beb1 #1 VOLUNTARY
> [ 41.225834][ C82] Tainted: [S]=CPU_OUT_OF_SPEC
> [ 41.225835][ C82] Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.02.01.0008.031920191559 03/19/2019
> [ 41.225836][ C82] RIP: 0010:intel_pmu_drain_pebs_nhm+0x56b/0x630
> [ 41.225839][ C82] Code: 48 e8 b9 cd fe ff 85 c0 0f 84 a9 00 00 00 41 f6 84 24 a4 01 00 00 80 0f 84 9a 00 00 00 4c 89 ef e8 1a 2a 34 00 e9 c7 fc ff ff
> <0f> 0b e9 c0 fc ff ff 0f 0b e9 b9 fc ff ff 48 8b 04 cb 48 89 84 cc
> [ 41.225841][ C82] RSP: 0018:fffffe00012f38c0 EFLAGS: 00010046
> [ 41.225843][ C82] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
> [ 41.225844][ C82] RDX: 0000000000000001 RSI: 0000000000000004 RDI: fffffe00012f3900
> [ 41.225845][ C82] RBP: fffffe00013120c8 R08: 0000000000000000 R09: 0000000000000000
> [ 20.931889][ T1340] Error: Driver 'pcspkr' is already registered, aborting...
> [ 41.225846][ C82] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
> [ 41.225847][ C82] R13: 0000000000000000 R14: fffffe00012f3c80 R15: 0000000000000000
> [ 41.225848][ C82] FS: 0000000000000000(0000) GS:ffff88f027c62000(0000) knlGS:0000000000000000
> [ 21.006859][ T1512] sd 6:0:0:0: Attached scsi generic sg0 type 0
> [ 21.013583][ T1512] sd 7:0:0:0: Attached scsi generic sg1 type 0
> [ 41.225849][ C82] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 41.225851][ C82] CR2: 00007ffe5571fe7c CR3: 00000040c5ae1003 CR4: 00000000007726f0
> [ 41.225852][ C82] PKRU: 55555554
> [ 41.225853][ C82] Call Trace:
> [ 41.225855][ C82] <NMI>
> [ 41.225861][ C82] handle_pmi_common+0x29b/0x430
> [ 41.225865][ C82] intel_pmu_handle_irq+0x109/0x2b0
> [ 41.225867][ C82] perf_event_nmi_handler+0x2a/0x70
> [ 41.225870][ C82] nmi_handle+0x53/0x130
> [ 41.225873][ C82] default_do_nmi+0x11d/0x170
> [ 41.225876][ C82] exc_nmi+0x106/0x1b0
> [ 41.225878][ C82] end_repeat_nmi+0xf/0x53
> [ 41.225880][ C82] RIP: 0010:find_next_fd+0x2a/0xb0
> [ 41.225883][ C82] Code: 0f 1f 44 00 00 41 54 89 f2 48 c7 c0 ff ff ff ff 49 89 fc 55 c1 ea 06 53 89 f3 48 8b 77 18 89 d9 48 d3 e0 48 f7 d0 48 0b 04 d6
> <48> 83 f8 ff 74 0d 48 f7 d0 f3 48 0f bc c0 83 f8 3f 76 3a 41 8b 2c
> [ 41.225885][ C82] RSP: 0018:ffffc90025283b90 EFLAGS: 00000206
> [ 41.225886][ C82] RAX: 0000000000000017 RBX: 0000000000000003 RCX: 0000000000000003
> [ 41.225887][ C82] RDX: 0000000000000000 RSI: ffff88f06d277150 RDI: ffff88f06d2770e8
> [ 41.225888][ C82] RBP: 0000000000000400 R08: 8080808080808080 R09: 979c8d9e9a8cdfff
> [ 41.225889][ C82] R10: fefefefefefefeff R11: 0000000000000000 R12: ffff88f06d2770e8
> [ 41.225890][ C82] R13: 0000000000088000 R14: ffff88f06d2770c0 R15: ffff88f06d2770e8
> [ 41.225893][ C82] ? find_next_fd+0x2a/0xb0
> [ 41.225896][ C82] ? find_next_fd+0x2a/0xb0
> [ 41.225899][ C82] </NMI>
> [ 41.225899][ C82] <TASK>
> [ 41.225900][ C82] alloc_fd+0x55/0x130
> [ 41.225902][ C82] do_sys_openat2+0x5a/0xf0
> [ 41.225905][ C82] __x64_sys_openat+0x6d/0xb0
> [ 41.225907][ C82] do_syscall_64+0x7f/0x2b0
> [ 41.225909][ C82] ? vfs_statx+0x68/0x170
> [ 41.225911][ C82] ? strncpy_from_user+0x26/0xf0
> [ 41.225914][ C82] ? vfs_fstatat+0x75/0xb0
> [ 41.225917][ C82] ? __do_sys_newfstatat+0x25/0x70
> [ 41.225919][ C82] ? path_openat+0xb6/0x2b0
> [ 41.225921][ C82] ? do_syscall_64+0x7f/0x2b0
> [ 41.225922][ C82] ? do_filp_open+0xc3/0x170
> [ 41.225924][ C82] ? do_syscall_64+0x7f/0x2b0
> [ 41.225925][ C82] ? __cond_resched+0x1e/0x70
> [ 41.225928][ C82] ? check_heap_object+0x34/0x1b0
> [ 41.225931][ C82] ? __check_object_size+0x5c/0x130
> [ 41.225933][ C82] ? do_sys_openat2+0x8a/0xf0
> [ 41.225936][ C82] ? __x64_sys_openat+0x6d/0xb0
> [ 41.225938][ C82] ? clear_bhb_loop+0x30/0x80
> [ 41.225940][ C82] ? clear_bhb_loop+0x30/0x80
> [ 41.225942][ C82] entry_SYSCALL_64_after_hwframe+0x76/0x7e
> [ 41.225944][ C82] RIP: 0033:0x7eff04bb9a2d
> [ 41.225946][ C82] Code: 48 89 54 24 e0 41 83 e2 40 75 32 89 f0 25 00 00 41 00 3d 00 00 41 00 74 24 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05
> <48> 3d 00 f0 ff ff 77 33 c3 66 2e 0f 1f 84 00 00 00 00 00 48 8d 44
> [ 41.225947][ C82] RSP: 002b:00007ffe5571f7e8 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
> [ 41.225949][ C82] RAX: ffffffffffffffda RBX: 0000558b3236dbe6 RCX: 00007eff04bb9a2d
> [ 41.225950][ C82] RDX: 0000000000080000 RSI: 00007eff04bc20b1 RDI: 00000000ffffff9c
> [ 41.225951][ C82] RBP: 00007eff04bcd1f8 R08: 0000000000000000 R09: 0000558b3236dbe6
> [ 41.225952][ C82] R10: 0000000000000000 R11: 0000000000000287 R12: ffffffffffffffff
> [ 41.225953][ C82] R13: 0000000000000001 R14: 00007eff04bcc020 R15: 00007eff04bcd6b8
> [ 41.225954][ C82] </TASK>
> [ 41.225955][ C82] ---[ end trace 0000000000000000 ]---
>
>
It looks the warning is triggered in the "error[i] != 0" case and lead to
the local events[] array is not initialized. Would fix it in next version.
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