the breaking commit was added upstream to 5.4.215, 5.15.71
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Jammy)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2020197
Title:
perf tool jit profiling broken 20.04
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Confirmed
Status in linux source package in Jammy:
Confirmed
Bug description:
The following kernel commit:
[babd04386b1df8c364cdaa39ac0e54349502e1e5] perf jit: Include program
header in ELF files
introduced a bug in perf that causes samples to be attributed to the wrong
instructions in
the annotated assembly output of `perf report` and `perf annotate`.
The following commit:
[89b15d00527b7825ff19130ed83478e80e3fae99] perf inject: Fix
GEN_ELF_TEXT_OFFSET for jit
fixes the bug. Can it be backported to 20.04 and wherever else it's needed?
The output looks very
confusing when parts of the code one expects to accumulate ticks don't and
other parts
that shouldn't be executed at all accumulate ticks.
The above patch depends on parts of
d6e6a27d960f9f07aef0b979c49c6736ede28f75, which depends on something
else, etc. etc.
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