This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- 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/1837788 Title: bcache kernel warning when attaching device Status in linux package in Ubuntu: Invalid Status in linux source package in Bionic: In Progress Status in linux source package in Disco: Fix Committed Status in linux source package in Eoan: Invalid Bug description: [Impact] * Users can get a Warning or even Oops the kernel if bcache/writeback_percent is set before attaching a caching device to the bcache device. * The fix is trivial, upstream, and consists of just checking whether the caching device is attached in order to set flags and schedule thread (which oops). [Test Case] * See attachment 'setup-bcache-wb_percent-before-attach.sh' used in comment #5 and #6 to reproduce the problem(s). * for 'Warning': # make-bcache -B <BACKING DEVICE> # make-bcache -C <CACHE DEVICE> # echo 11 > /sys/block/<BACKING DEVICE>/bcache/writeback_percent # sleep 1 # echo <CSET_UUID> > /sys/block/<BACKING DEVICE>/bcache/attach * for 'Oops': (steps above, but don't run last command / 'attach'). [Regression Potential] * Low. The fix is trivial, contained, and exclusive to bcache sysfs handler. * The modified path has been exercised with synthetic testing (script). [Original Bug Description] See attached dmesg, each time this server is rebooted it emits a concerning bcache warning. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-54-generic 4.15.0-54.58 ProcVersionSignature: Ubuntu 4.15.0-54.58-generic 4.15.18 Uname: Linux 4.15.0-54-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.15.0-54-generic. AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.7 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D3c', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D3p', '/dev/snd/controlC1', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer': 'amixer' Date: Wed Jul 24 12:28:06 2019 InstallationDate: Installed on 2013-10-04 (2119 days ago) InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Beta amd64 (20130925.1) MachineType: Supermicro X9DAi ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-54-generic root=UUID=8577302d-1f37-40a6-afcd-385beb26059f ro nomodeset elevator=deadline nvme_core.default_ps_max_latency_us=0 nopti noibrs noibpb RelatedPackageVersions: linux-restricted-modules-4.15.0-54-generic N/A linux-backports-modules-4.15.0-54-generic N/A linux-firmware 1.173.9 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: Upgraded to bionic on 2018-06-09 (409 days ago) dmi.bios.date: 05/09/2015 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3.2 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: X9DAi dmi.board.vendor: Supermicro dmi.board.version: 0123456789 dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Supermicro dmi.chassis.version: 0123456789 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.2:bd05/09/2015:svnSupermicro:pnX9DAi:pvr0123456789:rvnSupermicro:rnX9DAi:rvr0123456789:cvnSupermicro:ct3:cvr0123456789: dmi.product.family: To be filled by O.E.M. dmi.product.name: X9DAi dmi.product.version: 0123456789 dmi.sys.vendor: Supermicro To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1837788/+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
