This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1885271
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1885271
Title:
kernel oops xr-usb-serial
Status in linux package in Ubuntu:
Incomplete
Bug description:
# Steps to reproduce
# Working case
uname -a
Linux ubuntu 4.15.0-91-generic #92-Ubuntu SMP Fri Feb 28 11:09:48 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
lsusb -d 04e2:1411 -v > xr-usb-serial-devices.txt
lsusb -t >> xr-usb-serial-devices.txt
# Unbind 2 xr-usb-serial devices
echo '3-14.1' | tee /sys/bus/usb/drivers/usb/unbind
echo '3-14.3' | tee /sys/bus/usb/drivers/usb/unbind
dmesg > dmesg.txt
# Non working case
uname -a
Linux ubuntu 4.15.0-99-generic #100-Ubuntu SMP Wed Apr 22 20:32:56 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
lsusb -d 04e2:1411 -v > xr-usb-serial-devices.txt
<lsusb hangs here>
dmesg > dmesg.txt
This regression is almost certainly caused by one of the 2020-03-11 commits:
https://kernel.ubuntu.com/git/ubuntu/ubuntu-bionic.git/log/ubuntu/xr-usb-serial?h=Ubuntu-4.15.0-99.100&id=5966ed54d467fa77e7dbd7355177a5a6d1db7004
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