cdc_acm: acm_port_activate - usb_submit_urb(ctrl irq) failed

[Mateusz]

Ubuntu 18.04.5 LTS
Recently, after kernel update 4.15.0.144 (didn't know about the case yet), i can't open serial ports on USB CDC devices (STM32 Virtual COMs in my case).

using simple cat command (with or without sudo):
$ sudo cat /dev/ttyACM1
cat: /dev/ttyACM1: Input/output error

or some serial programs:
Failed to connect to /dev/ttyACM1 : [Errno 5] could not open port /dev/ttyACM1: [Errno 5] Input/output error: '/dev/ttyACM1'

dmesg:
[ 3295.718270] cdc_acm 1-2:1.0: ttyACM1: USB ACM device
[ 3302.508356] cdc_acm 1-2:1.0: acm_port_activate - usb_submit_urb(ctrl irq) failed
[ 3302.508940] cdc_acm 1-2:1.0: acm_port_activate - usb_submit_urb(ctrl irq) failed

When i try spamming commands while plugging the device in, i am sometimes able to open the port (might be the clue).

When i booted in ubuntu advanced mode to 4.15.0.143 kernel, everything started to work normally.

Also tried HWE stack with 5.4.0.74 kernel, but the bug was also present there.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

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[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Matthias Kuntze (shiro-kano)]

Im using Ubuntu 20.04 LTS and have the same problem. I got the problem after upgrading from Kernel 5.4.0-73-generic to 5.4.0-74-generic. As I got in addition a firmware/microcode update it may be possible that the error is adjacent to that update too.
If I boot to kernel 5.4.0-73-generic I have access to the serial line (e.g. /dev/ttyACM3).

[Matthias Kuntze (shiro-kano)]

excerpt from /var/log/apt/history.log:

Update from 73 to 74:
Commandline: aptdaemon role='role-commit-packages' sender=':1.165'
Install: linux-image-5.4.0-74-generic:amd64 (5.4.0-74.83, automatic),...

Update firmware/microcode:
Commandline: aptdaemon role='role-commit-packages' sender=':1.173'
Upgrade: intel-microcode:amd64 (3.20210216.0ubuntu0.20.04.1, 3.20210608.0ubuntu0.20.04.1), linux-firmware:amd64 (1.187.12, 1.187.14)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Matthias Kuntze (shiro-kano)]

I did an upgrade from kernel 5.4.0-74-generic to 5.4.0-77-generic and the problem disappeared.

$ stty -F /dev/ttyACM0
speed 57600 baud; line = 0;
eof = ^A; min = 1; time = 0;
-brkint -icrnl -imaxbel
-opost -onlcr
-icanon -echo -echoe