** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1891528
Title:
fix ftrace pid filtering on linux 5.8
Status in ubuntu-kernel-tests:
In Progress
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Groovy:
Incomplete
Bug description:
A couple of ftrace kernel self test regression tests are failing on
systems with 1 CPU, notably small 1 CPU cloud instances. The two
tests that are failing are:
[20] ftrace - function graph filters with stack tracer
[21] ftrace - function graph filters
Bisected this down to commit 717e3f5ebc82 ("ftrace: Make function
trace pid filtering a bit more exact") in linux 5.6-rc4 and found
and tested an upstream fix to this issue with the commit
c58b6b0372de ("ftrace: Fix ftrace_trace_task return value").
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