Well this is more about the user space tool perf, not really the kernel
itself. And I can't really imagine why DWARF unwinding would have
anything to do with the kernel used. I'm on stock ubuntu
4.13.0-38-generic btw.
When I compile perf from the kernel source (commit
2bf1ab321a06a7faeb95c56d02139140fb56199a) it seems that it fails when
only having libdw-dwarf-unwind as system feature. When having both
libdw-dwarf-unwind and libunwind available the compiled perf does not
fail the test. I think that for DWARF unwinding either one of those two
libraries should be enough, so maybe this is a bug in libdwarf or how
perf uses libdwarf, and when libunwind is available it uses it instead.
But just a wild guess, I don't really know what's going on.
In any case, a quick "fix" seems to be building perf with libunwind -
even if that just masks the actual bug here.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1762652
Title:
perf DWARF unwind failed
Status in linux package in Ubuntu:
Confirmed
Bug description:
Ubuntu 17.10. To reproduce:
$ perf test
[...]
57: DWARF unwind : FAILED!
[...]
It seems perf is somehow mis-configured.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1762652/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
