If we find a problem in Ubuntu that has not already been fixed in the latest upstream kernel then we'll try to fix it ourselves and send the patch upstream. But most of the time we backport already existing upstream fixes to affected Ubuntu kernels.
The process of finding the fix for a specific problem is: 1) Find the first kernel version that works (good kernel). 2) Look at the changes between the previous (bad) and the good kernel. 3) If nothing jumps out that might indicate which commit fixed the problem: git bisect to narrow it further down. But typically, if a user reports that a specific problem has been fixed with a kernel update then that's good enough for us even without knowing exactly which specific commit fixed it. Sometimes there are a lot of upstream changes that we pull into an update. It's the distros responsibilities to keep their kernels up-to-date and every distro does it differently. Ubuntu updates kernels every 3 weeks (roughly): https://wiki.ubuntu.com/StableReleaseUpdates -- 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/1891768 Title: hfs+ filesystems fail reading / writing large files Status in linux package in Ubuntu: Confirmed Bug description: I noticed a problem reading hfs+ partitions on a USB flash drive after I installed Ubuntu 20.04 on two laptop machines. I have a Mini Mac that I share files via an USB flash drive formatted with hfs+ from the laptops with Ubuntu installed. I had no issues with Ubuntu Mate 18.10. I noticed that very large files, typicality larger than 100 MB, would have read errors or sometimes have a zero file size. One particular file about 500MB fails nearly every time. Other files, down to about 100MB fail sometimes. I bought a new USB flash drive, but have the same failures on that. I have an identical flash drive formatted with ext4 which has no issues. I'm currently booting to Ubuntu Mate 18.10 to write the hfs+ USB flash drive. 1007 ceres ~ cat /proc/version_signature Ubuntu 5.4.0-42.46-generic 5.4.44 1000 ceres ~ lsb_release -rd Description: Ubuntu 20.04.1 LTS Release: 20.04 1005 admin@ceres ~ sudo lspci -vnvn > lspci-vnvn.log pcilib: sysfs_read_vpd: read failed: Input/output error pcilib: sysfs_read_vpd: read failed: Input/output error --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: uschcld 1581 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: MATE DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-05-17 (91 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 0408:a030 Quanta Computer, Inc. HD WebCam Bus 001 Device 003: ID 04ca:3015 Lite-On Technology Corp. Bus 001 Device 002: ID 046d:c06c Logitech, Inc. Optical Mouse Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Acer Aspire E5-576 Package: linux (not installed) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=UUID=75021464-0e3f-4ad2-a466-cf655a6c4dd7 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 RelatedPackageVersions: linux-restricted-modules-5.4.0-42-generic N/A linux-backports-modules-5.4.0-42-generic N/A linux-firmware 1.187.2 Tags: focal Uname: Linux 5.4.0-42-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dialout dip fax floppy plugdev tape video www-data _MarkForUpload: True dmi.bios.date: 09/06/2018 dmi.bios.vendor: Insyde Corp. dmi.bios.version: V1.47 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: Ironman_SK dmi.board.vendor: KBL dmi.board.version: V1.47 dmi.chassis.type: 10 dmi.chassis.vendor: Chassis Manufacturer dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.47:bd09/06/2018:svnAcer:pnAspireE5-576:pvrV1.47:rvnKBL:rnIronman_SK:rvrV1.47:cvnChassisManufacturer:ct10:cvrChassisVersion: dmi.product.family: Aspire E 15 dmi.product.name: Aspire E5-576 dmi.product.sku: 0000000000000000 dmi.product.version: V1.47 dmi.sys.vendor: Acer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1891768/+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
