** Also affects: linux-raspi (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux-raspi (Ubuntu Bionic)
Status: New => Fix Committed
** Also affects: linux-raspi-5.4 (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux-raspi (Ubuntu Bionic)
** No longer affects: linux-raspi-5.4 (Ubuntu Focal)
** Changed in: linux-raspi-5.4 (Ubuntu Bionic)
Status: New => Fix Committed
** Changed in: linux-raspi-5.4 (Ubuntu)
Status: New => Invalid
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-raspi in Ubuntu.
https://bugs.launchpad.net/bugs/1890808
Title:
Build preemptible raspi kernels
Status in linux-raspi package in Ubuntu:
Invalid
Status in linux-raspi-5.4 package in Ubuntu:
Invalid
Status in linux-raspi-5.4 source package in Bionic:
Fix Committed
Status in linux-raspi source package in Focal:
Fix Committed
Bug description:
[Impact]
Hangs and lockups are observed when lots of USB interrupts occur. The
FIQ handling in the dwc_otg driver seems to be particular susceptible
to this setting.
[Test Case]
Connect a USB/serial adapter to the Pi. Run 'minicom -D /dev/ttyUSB0'.
Send data over that serial connection from a remote device. The Pi
will hang within seconds.
[Regression Potential]
This change enables full preemption which could uncover all sorts of
problems like hangs and/or lockups.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1890808/+subscriptions
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