apport information ** Attachment added: "Lspci.txt" https://bugs.launchpad.net/bugs/1987232/+attachment/5610808/+files/Lspci.txt
-- 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/1987232 Title: WARN in trace_event_dyn_put_ref Status in linux package in Ubuntu: Confirmed Bug description: I have systems that are regularly hitting a WARN in trace_event_dyn_put_ref. The exact message is: WARNING: CPU: 1 PID: 30309 at kernel/trace/trace_dynevent.c:46 +trace_event_dyn_put_ref+0x15/0x20 With the following stacktrace: perf_trace_init+0x8f/0xd0 perf_tp_event_init+0x1f/0x40 perf_try_init_event+0x4a/0x130 perf_event_alloc+0x497/0xf40 __do_sys_perf_event_open+0x1d4/0xf70 __x64_sys_perf_event_open+0x20/0x30 do_syscall_64+0x5c/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae I've debugged this and worked with upstream to get a fix into Linux. It was recently merged in 6.0-rc2. See here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.0-rc2&id=7249921d94ff64f67b733eca0b68853a62032b3d The problem started appearing as soon as our systems picked up the linux-aws-5.15 branch for Focal. (That was 5.15.0-1015-aws, if memory serves). Could you please cherry pick this fix and pull it back to the the linux and linux-aws kernels for Focal? There's test here: https://lore.kernel.org/all/cover.1660347763.git.k...@templeofstupid.com/ that reproduces the problem very reliably for me. With the patch applied, I no longer get the WARNs. --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Aug 22 17:32 seq crw-rw---- 1 root audio 116, 33 Aug 22 17:32 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.11-0ubuntu27.24 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A CasperMD5CheckResult: skip DistroRelease: Ubuntu 20.04 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Error: command ['lsusb'] failed with exit code 1: Lsusb-t: Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1: MachineType: Amazon EC2 c5d.12xlarge Package: linux (not installed) PciMultimedia: ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=C.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-1015-aws root=PARTUUID=4986e35b-1bd5-45d3-b528-fa2edb861a38 ro console=tty1 console=ttyS0 nvme_core.io_timeout=4294967295 panic=-1 ProcVersionSignature: Ubuntu 5.15.0-1015.19~20.04.1-aws 5.15.39 RelatedPackageVersions: linux-restricted-modules-5.15.0-1015-aws N/A linux-backports-modules-5.15.0-1015-aws N/A linux-firmware N/A RfKill: Error: [Errno 2] No such file or directory: 'rfkill' Tags: focal uec-images Uname: Linux 5.15.0-1015-aws x86_64 UnreportableReason: This report is about a package that is not installed. UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: N/A _MarkForUpload: False dmi.bios.date: 10/16/2017 dmi.bios.release: 1.0 dmi.bios.vendor: Amazon EC2 dmi.bios.version: 1.0 dmi.board.asset.tag: i-03f5d8581c7ad94aa dmi.board.vendor: Amazon EC2 dmi.chassis.asset.tag: Amazon EC2 dmi.chassis.type: 1 dmi.chassis.vendor: Amazon EC2 dmi.modalias: dmi:bvnAmazonEC2:bvr1.0:bd10/16/2017:br1.0:svnAmazonEC2:pnc5d.12xlarge:pvr:rvnAmazonEC2:rn:rvr:cvnAmazonEC2:ct1:cvr:sku: dmi.product.name: c5d.12xlarge dmi.sys.vendor: Amazon EC2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1987232/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
