Hi Brendan, Thanks for testing! Glad that 5.0 and 5.8 works, so this is already fixed.
For now, I'd suggest bisecting with the already available/built kernel packages from the launchpad archive, which should be faster; then eventually get down to git to identify it more closely. Since you know that 4.18.0-25 fails and 5.0.0-13 works, I'd suggest you take the available built deb files from the Disco linux package archive, which has some 4.18, 4.19, and 5.0 packages. https://launchpad.net/ubuntu/disco/+source/linux Click on the desired version number in 'Releases in Ubuntu' (duplicates are OK) Click on 'amd64' in 'Builds' Download the required .deb files (watch out for .ddeb and .udeb) in 'Built files' Install them with 'sudo dpkg -i *.deb' as usual And then you can iterate/bisect with the available builds, which should help reduce the range of version tags to find the fix in git. As for building the kernel packages and the systemd failure, I would suggest you to use the Ubuntu kernel build process and configs instead of 'make deb-pkg' from upstream, which doesn't consider Ubuntu's stuff/configs in the tree, and might then give you some trouble. Ah, and building the Disco packages on a Disco container, so that build deps and release stuff are as expected. Steps follow below. Hope this helps. cheers, Mauricio ... # start a disco container lxc launch ubuntu:19.04 disco lxc shell disco # fixup apt sources and install build dependencies sed -i 's,http://.*.ubuntu.com,http://old-releases.ubuntu.com,' /etc/apt/sources.list sed -i 's/^# deb-src/deb-src/' /etc/apt/sources.list apt build-dep -y linux # select source/tag you'll build git clone ... # --reference ~/git/linux is handy/speedy if you have it already. cd ubuntu-disco git checkout Ubuntu-<version> # I'd suggest manually bisecting with tags # as a complete tag/package release is more # likely to work; git bisect might land you # in a commit that doesn't build/work well. # always build using the ubuntu configs and # stuff, w/ this procedure (reference below) # build LANG=C fakeroot debian/rules clean LANG=C fakeroot debian/rules binary-headers binary-generic binary-perarch # packages in ../*.deb # you'll likely need linux-image-unsigned, linux-modules, # possibly linux-modules-extra (storage/raid controllers mostly) # and linux-headers (two pkgs) if you build modules/dkms/nvidia. reference: https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel -- 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/1895563 Title: Kernel Oops: Rsyncing to bcache device w/o backing cache kernel panic Status in linux package in Ubuntu: Confirmed Bug description: Platform details: 1) version.log attached 2) lspci-vnvn.log attached 3) lsb_release -rd Description: Ubuntu 18.04.5 LTS Release: 18.04 4) apt-cache policy bcache-tools bcache-tools: Installed: 1.0.8-2ubuntu0.18.04.1 Candidate: 1.0.8-2ubuntu0.18.04.1 Version table: *** 1.0.8-2ubuntu0.18.04.1 500 500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages 100 /var/lib/dpkg/status 1.0.8-2build1 500 500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages 5) uname -a: Linux timber4 4.15.0-117-generic #118-Ubuntu SMP Fri Sep 4 20:02:41 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux Short problem description: Rsyncing from a 1.4TB home dir to a an new filesystem on a bcache device without an attached cache eventually results in kernel panic. What I expected to happen: no kernel panic. Long problem description: 1) Devices / Filesystems: bfd01: 8*4TB configured as RAID6 using md LVM2 volume group. bfd02: 8*4TB configured as RAID6 using Dell PERC H810 LVM2 volume group. The tree contains 1069685 files / dirs. 2) Steps to reproduce: # Make the device, format and mount it make-bcache -B /dev/vg-bfd02/delme01_bc mkfs.xfs -f -L delme01bc /dev/bcache0 mount /dev/bcache0 /dev/bfd02/delme01bc # Rsync flags="-a --delete" ; info_cmd="--info=progress2" ; excludes=""; src=/mnt/bfd01/delme01 ; tgt=/mnt/bfd02/delme01bc/ ; time rsync $flags $info_cmd $excludes $src/ $tgt/ ... # eventually kernel panic Using incremental rsync it will kernel panic after reading about 21GB. # If instead I use non-incremental rsync it will kernel panic after reading about 1.2-1.3TB. flags="--no-inc-recursive -ax -HAXS --delete" ; info_cmd="--info=progress2" ; excludes=""; ... # eventually kernel panic Additional detail: 1) I was *not* able to reproduce if bfd01/delm01bc was a target and bfd02 was the source e.g. # Rsync flags="-a --delete" ; info_cmd="--info=progress2" ; excludes=""; src=/mnt/bfd02/delme01 ; tgt=/mnt/bfd01/delme01bc/ ; time rsync $flags $info_cmd $excludes $src/ $tgt/ ... # rsync completes successfully 2) I was *not* able to reproduce if I attached and then detached a cache set: ceho 'd3b93488-714e-4efa-af94-cd80fd2db11f' > /sys/block/bcache0/bcache/attach echo 1 > /sys/block/bcache0/bcache/detach ... time rsync $flags $info_cmd $excludes $src/ $tgt/ ... # rsync completes successfully I have 11 compressed kernel crash dumps. I will upload 3 after filing this. Let me know if you want the other 8. ProblemType: KernelCrash DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-117-generic 4.15.0-117.118 ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18 Uname: Linux 4.15.0-117-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Sep 13 12:53 seq crw-rw---- 1 root audio 116, 33 Sep 13 12:53 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.17 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Sat Sep 12 09:51:37 2020 HibernationDevice: RESUME=none IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' MachineType: Dell Inc. PowerEdge R620 PciMultimedia: ProcFB: 0 mgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-117-generic root=UUID=de68d15b-3948-4666-9bc5-5cbecc83971c ro maybe-ubiquity crashkernel=512M-:512M RelatedPackageVersions: linux-restricted-modules-4.15.0-117-generic N/A linux-backports-modules-4.15.0-117-generic N/A linux-firmware 1.173.19 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/06/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.9.0 dmi.board.name: 0KCKR5 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.9.0:bd12/06/2019:svnDellInc.:pnPowerEdgeR620:pvr:rvnDellInc.:rn0KCKR5:rvrA00:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R620 dmi.sys.vendor: Dell Inc. --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Sep 13 12:53 seq crw-rw---- 1 root audio 116, 33 Sep 13 12:53 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.17 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=none IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' MachineType: Dell Inc. PowerEdge R620 Package: linux (not installed) PciMultimedia: ProcFB: 0 mgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-117-generic root=UUID=de68d15b-3948-4666-9bc5-5cbecc83971c ro maybe-ubiquity crashkernel=512M-:512M ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-117-generic N/A linux-backports-modules-4.15.0-117-generic N/A linux-firmware 1.173.19 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' Tags: bionic uec-images Uname: Linux 4.15.0-117-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 12/06/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.9.0 dmi.board.name: 0KCKR5 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.9.0:bd12/06/2019:svnDellInc.:pnPowerEdgeR620:pvr:rvnDellInc.:rn0KCKR5:rvrA00:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R620 dmi.sys.vendor: Dell Inc. --- ProblemType: Bug AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Sep 13 12:53 seq crw-rw---- 1 root audio 116, 33 Sep 13 12:53 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.17 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: DistroRelease: Ubuntu 18.04 HibernationDevice: RESUME=none IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' MachineType: Dell Inc. PowerEdge R620 Package: linux (not installed) PciMultimedia: ProcFB: 0 mgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-117-generic root=UUID=de68d15b-3948-4666-9bc5-5cbecc83971c ro maybe-ubiquity crashkernel=512M-:512M ProcVersionSignature: Ubuntu 4.15.0-117.118-generic 4.15.18 RelatedPackageVersions: linux-restricted-modules-4.15.0-117-generic N/A linux-backports-modules-4.15.0-117-generic N/A linux-firmware 1.173.19 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' Tags: bionic uec-images Uname: Linux 4.15.0-117-generic x86_64 UnreportableReason: This report is about a package that is not installed. UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: False dmi.bios.date: 12/06/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.9.0 dmi.board.name: 0KCKR5 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.9.0:bd12/06/2019:svnDellInc.:pnPowerEdgeR620:pvr:rvnDellInc.:rn0KCKR5:rvrA00:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R620 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1895563/+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
