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Groups > linux.kernel > #1497837

perf TUI fails with "failed to process type: 64"

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Hi,

Updating to mainline as of last night, I started seeing the following
error when running the perf report TUI:

0x46068 [0x8]: failed to process type: 68

This event is just PERF_RECORD_FINISHED_ROUND:

0x46068 [0x8]: event: 68
.
. ... raw event: size 8 bytes
.  0000:  44 00 00 00 00 00 08 00                          D.......        

0x46068 [0x8]: PERF_RECORD_FINISHED_ROUND

Which of course is not our error. It took me a while to find the real
culprit:

 14c00-14c00 g exc_virt_0x4c00_system_call

A zero length symbol, which __symbol__inc_addr_samples() barfs on:

        if (addr < sym->start || addr >= sym->end) {
...
		return -ERANGE;

Seems like we have 3 bugs here:

1. Output the real source of the error instead of PERF_RECORD_FINISHED_ROUND

2. Don't exit the TUI if we find a sample on a zero length symbol

3. Why do we have zero length symbols in the first place? Does the recent
   ppc64 exception clean up have something to do with it?

Anton

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perf TUI fails with "failed to process type: 64" Anton Blanchard <anton@samba.org> - 2016-10-09 03:20 +0200
  Re: perf TUI fails with "failed to process type: 64" Michael Ellerman <mpe@ellerman.id.au> - 2016-10-10 07:10 +0200
    Re: perf TUI fails with "failed to process type: 64" Nicholas Piggin <npiggin@gmail.com> - 2016-10-10 08:00 +0200
    Re: perf TUI fails with "failed to process type: 64" Anton Blanchard <anton@samba.org> - 2016-10-10 12:20 +0200
      Re: perf TUI fails with "failed to process type: 64" Michael Ellerman <mpe@ellerman.id.au> - 2016-10-10 12:40 +0200

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