Messages in this thread |  | | Date | Mon, 10 Oct 2016 16:59:24 +1100 | From | Nicholas Piggin <> | Subject | Re: perf TUI fails with "failed to process type: 64" |
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On Mon, 10 Oct 2016 16:02:07 +1100 Michael Ellerman <mpe@ellerman.id.au> wrote:
> Anton Blanchard <anton@samba.org> writes: > > > 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 > ^ > What's this? The address? If so it's wrong? > > > > 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: > ... > > > > 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? > > Seems likely. But I can't see why. > > AFAICS we have never emitted a size for those symbols: > > Old: > $ nm --print-size build/vmlinux | grep -w system_call_relon_pSeries > c000000000004c00 T system_call_relon_pSeries > > New: > $ nm --print-size build/vmlinux | grep -w exc_virt_0x4c00_system_call > c000000000004c00 T exc_virt_0x4c00_system_call > > > It also doesn't look like we're emitting another symbol with the same > address, which has caused confusion in the past: > > Old: > c000000000004c00 T exc_virt_0x4c00_system_call > c000000000004d00 T exc_virt_0x4d00_single_step > > New: > c000000000004c00 T system_call_relon_pSeries > c000000000004d00 T single_step_relon_pSeries > > > So more digging required.
Yeah, strange. Maybe perf changes?
We were talking about adding size and type to the exception symbols though.
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