I brought this up on the linux-usb email list and was told it was more likely to be an issue in the filesystem code. In addition, that code (and the USB code) don't expect an MSC USB device to behave badly, and there's no guarantee that if it does, Linux will not crash. In this case, the filesystem changes abruptly out from under the filesystem code.
linux-usb thread: https://marc.info/?l=linux-usb&m=159387610928589&w=2 I suppose you can close this now. I wish Linux were more robust about this, but it appears to be a "won't fix" from their point of view. -- 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/1871143 Title: Kernel crash during USB device enumeration or mounting Status in linux package in Ubuntu: Incomplete Bug description: Device is an Adafruit microcontroller board running https://github.com/adafruit/circuitpython, using the TinyUSB USB stack: https://github.com/hathach/tinyusb. Device presents a composite USB device that includes MSC, CDC, HID, and MIDI Device was commanded to forcibly reformat its MSC FAT12 filesystem and then reset, which causes a USB reset and re-enumeration. This causes some USB kernel code to crash, much of the time, though not quite all the time. I work for Adafruit and the maintainer of TinyUSB also works for Adafruit, so we can provide further help to track this down. Attached is the dmesg file for the crash. I tried uploading the dump file from kdump, but launchpad is timing out. The dump file is available at: https://drive.google.com/open?id=1ka3ySSccEMRSmnYgI9X16IndPDmIKTD6 ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-21-generic 5.4.0-21.25 ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27 Uname: Linux 5.4.0-21-generic x86_64 ApportVersion: 2.20.11-0ubuntu24 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: halbert 1857 F.... pulseaudio /dev/snd/controlC2: halbert 1857 F.... pulseaudio CurrentDesktop: X-Cinnamon Date: Mon Apr 6 11:09:43 2020 HibernationDevice: RESUME=UUID=55694d39-bafe-45f8-ba05-ea5d54a93a85 InstallationDate: Installed on 2017-09-19 (929 days ago) InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2) IwConfig: eno1 no wireless extensions. lo no wireless extensions. MachineType: Dell Inc. OptiPlex 7010 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=b3868153-c620-4efe-9dfc-8059dc6288a8 ro quiet splash crashkernel=512M-:192M vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-21-generic N/A linux-backports-modules-5.4.0-21-generic N/A linux-firmware 1.187 RfKill: 0: hci0: Bluetooth Soft blocked: yes Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-03-08 (28 days ago) dmi.bios.date: 06/28/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: A29 dmi.board.name: 0WR7PY dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 15 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA29:bd06/28/2018:svnDellInc.:pnOptiPlex7010:pvr01:rvnDellInc.:rn0WR7PY:rvrA01:cvnDellInc.:ct15:cvr: dmi.product.name: OptiPlex 7010 dmi.product.sku: OptiPlex 7010 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1871143/+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
