Public bug reported:
[Impact]
kprobes are not available on arm64, a useful debug feature available on all
other supported Ubuntu architectures. I failed to catch this when I reviewed
the yakkety config because I was just looking for regressions vs. enabling new
features (arm64/kprobes is new in 4.8).
[Test Case]
sudo perf probe schedule
sudo perf record -e probe:schedule -aR sleep 1
[Regression Risk]
The proposed fix enables a config for an already-upstream feature, so
regressions will have upstream support. The config change mostly results in
building new code vs. modifying existing code. The notable exception is that
arm64's notify_page_fault() will now get code to call kprobe_fault_handler() -
but only in the case that this newly enabled feature is being used (if
kprobe_running()).
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: dann frazier (dannf)
Status: In Progress
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https://bugs.launchpad.net/bugs/1634271
Title:
arm64: kprobes disabled
Status in linux package in Ubuntu:
In Progress
Bug description:
[Impact]
kprobes are not available on arm64, a useful debug feature available on all
other supported Ubuntu architectures. I failed to catch this when I reviewed
the yakkety config because I was just looking for regressions vs. enabling new
features (arm64/kprobes is new in 4.8).
[Test Case]
sudo perf probe schedule
sudo perf record -e probe:schedule -aR sleep 1
[Regression Risk]
The proposed fix enables a config for an already-upstream feature, so
regressions will have upstream support. The config change mostly results in
building new code vs. modifying existing code. The notable exception is that
arm64's notify_page_fault() will now get code to call kprobe_fault_handler() -
but only in the case that this newly enabled feature is being used (if
kprobe_running()).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1634271/+subscriptions
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