Public bug reported:
attempting to reproduce bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1905782 on ubuntu
20.04.1 LTS yields a kernel OOOPS / page fault in the USB cdc_acm driver.
will upload OOOPs shortly.
steps to reproduce:
1. boot ubuntu 20.04.1 LTS (In this case from live CD)
2. plug in a USB device with a virtual com port
3. configure the TTY assigned (/dev/ttyACM0) setting dtr/rts (for example with
minicom)
4. device does not support setting dtr/rts
expected result:
error message
actual result:
error message plus page fault in kernel space plus system becoming unstable
will upload and attach dmesg log as soon as I managed to log the oops
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.4.0-42-generic 5.4.0-42.46
ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu27.4
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: ubuntu 4492 F.... pulseaudio
CasperMD5CheckMismatches: ./casper/filesystem.squashfs
CasperMD5CheckResult: skip
CasperVersion: 1.445.1
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 27 17:37:22 2020
LiveMediaBuild: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: FUJITSU LIFEBOOK E736
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed
maybe-ubiquity quiet splash ---
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
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/20/2016
dmi.bios.vendor: FUJITSU // Insyde Software Corp.
dmi.bios.version: Version 1.22
dmi.board.name: FJNB293
dmi.board.vendor: FUJITSU
dmi.board.version: M4
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU
dmi.chassis.version: LIFEBOOK E736
dmi.modalias:
dmi:bvnFUJITSU//InsydeSoftwareCorp.:bvrVersion1.22:bd12/20/2016:svnFUJITSU:pnLIFEBOOKE736:pvr10601115935:rvnFUJITSU:rnFJNB293:rvrM4:cvnFUJITSU:ct10:cvrLIFEBOOKE736:
dmi.product.family: LIFEBOOK-FTS
dmi.product.name: LIFEBOOK E736
dmi.product.version: 10601115935
dmi.sys.vendor: FUJITSU
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal
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https://bugs.launchpad.net/bugs/1905994
Title:
failure to set dtr/rts on USB VCP causes kernel page fault
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