perf.c and log files attached. ** Description changed:
+ The system calls return no errors, just all results are 0. + jak@jak-t14-g3 ~/P/D/apt (main)> gcc perf.c -Wall -Wextra -pedantic -DTOTAL_EVENTS=5 && strace -o perf-5.log ./a.out Num events captured: 5 Event: 41 -> 2387463223 Event: 42 -> 4000001326 Event: 43 -> 7389 Event: 44 -> 194 Event: 45 -> 1000001291 CPU cycles: 2387463223 Instructions retired: 4000001326 cache refs 7389 cache msises: 194 branch refs: 1000001291 jak@jak-t14-g3 ~/P/D/apt (main)> gcc perf.c -Wall -Wextra -pedantic -DTOTAL_EVENTS=6 && strace -o perf-6.log ./a.out Num events captured: 6 Event: 46 -> 0 Event: 47 -> 0 Event: 48 -> 0 Event: 49 -> 0 Event: 50 -> 0 Event: 51 -> 0 CPU cycles: 0 Instructions retired: 0 cache refs 0 cache msises: 0 branch refs: 0 branch misses: 0 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-6.19.0-3-generic 6.19.0-3.3+1 ProcVersionSignature: Ubuntu 6.19.0-3.3-generic 6.19.0-rc6 Uname: Linux 6.19.0-3-generic x86_64 ApportVersion: 2.33.1-0ubuntu3 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Wed Feb 11 12:06:29 2026 InstallationDate: Installed on 2022-11-26 (1173 days ago) InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Alpha amd64 (20221126) MachineType: LENOVO 21CF004PGE ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.19.0-3-generic root=/dev/mapper/ubuntu-root ro rootflags=subvol=@ quiet splash isolcpus=15 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M vt.handoff=7 RelatedPackageVersions: - firmware-sof N/A - linux-firmware 20260108.gitd86b47f7-0ubuntu1 + firmware-sof N/A + linux-firmware 20260108.gitd86b47f7-0ubuntu1 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/29/2024 dmi.bios.release: 1.53 dmi.bios.vendor: LENOVO dmi.bios.version: R23ET77W (1.53 ) dmi.board.asset.tag: Not Available dmi.board.name: 21CF004PGE dmi.board.vendor: LENOVO dmi.board.version: SDK0T76538 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.32 dmi.modalias: dmi:bvnLENOVO:bvrR23ET77W(1.53):bd05/29/2024:br1.53:efr1.32:svnLENOVO:pn21CF004PGE:pvrThinkPadT14Gen3:rvnLENOVO:rn21CF004PGE:rvrSDK0T76538WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21CF_BU_Think_FM_ThinkPadT14Gen3: dmi.product.family: ThinkPad T14 Gen 3 dmi.product.name: 21CF004PGE dmi.product.sku: LENOVO_MT_21CF_BU_Think_FM_ThinkPad T14 Gen 3 dmi.product.version: ThinkPad T14 Gen 3 dmi.sys.vendor: LENOVO -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2141541 Title: perf_event_open() returns all 0s if more than 5 events in a group To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2141541/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
