Hmm, apparently /usr/bin/perf is only a wrapper script that runs the
"right" version of the perf executable for the current kernel. But the
perf executable (typically inside /usr/lib/linux-tools-VERSION) is part
of the "linux-tools-VERSION" package.
So if I do:
$ sudo apt install
I've installed linux-tools-common 4.15.0-47.50 from bionic-proposed and
checked that the new /usr/bin/perf binary still doesn't demangle C++
symbols (even when "perf report --demangle" is passed explicitly).
** Tags removed: verification-needed-bionic
** Tags added: verification-failed-bionic
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Note that `perf` can crash when demangling. The (trivial) patch shown below
fixes the issue for me:
http://lkml.iu.edu/hypermail/linux/kernel/1810.2/02663.html
Related libbfd issue for incorrect demangling:
https://sourceware.org/bugzilla/show_bug.cgi?id=23715
** Bug watch added:
As #18 pointed out, this still affects 18.04. Could the fix be ported
there?
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https://bugs.launchpad.net/bugs/1396654
Title:
C++ demangling support missing from perf
This bug still occurs for me with 4.15.0-32-generic (Ubuntu 18.04.1) if
I don't disable C6 states.
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https://bugs.launchpad.net/bugs/1690085
Title:
Ryzen 1800X freeze -
According at least to http://blog.programster.org/stabilizing-
ubuntu-16-04-on-ryzen, 18.04 is supposed to be ok. I haven't upgraded
yet myself.
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I got this issue after trying to install the nvidia-352 driver on my laptop (an
optimus setup with both an Intel iGPU and a NVidia GPU).
I then uninstalled the NVidia driver, but it still doesn't fix the problem,
which is mysterious.
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