** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1851347
Title:
libmbim-proxy using 100% CPU on a Dell Edge Gateway 3002
Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
Fix Committed
Bug description:
== Impact ==
A Dell Edge Gateway 3002 user reported that `top` reports around 100% CPU
usage for the libmbim-proxy process. Seen in at least 40% of their devices at
some point during the last 6 months. The CPU keeps high at ~100% days or weeks,
but does return back to normal without a reboot. The LTE connectivity is
seemingly still working as usual.
The issue starts after an EPIPE error in the syslogs: 'cdc_mbim
1-3:1.12: nonzero urb status received: -EPIPE'.
== Fix ==
8fec9355a968 USB: cdc-wdm: ignore -EPIPE from GetEncapsulatedResponse
This has been in mainline kernel since 4.14.
== Testcase ==
Connect to the LTE network and see if libmbim-proxy uses 100% after some
point.
== Risk of Regression ==
Low, since
1. Already tested by original reporter and no issue found after more than a
week (usually it fails twice in a week).
2. Ignoring -EPIPE is the default behavior after 4.14.
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