Unable to read build ID header

[moshtalaghi]

I'm useing create_llvm_prof to use with PGO.
I ran my application which is built with -g under perf record -b which generates perf.data
The perf.data is 366 MB and I can run perf report on it which tells me that the file is okay
While reading the perf.data, create_llvm_prof quits with following error:
E0512 19:20:31.186863 8230 data_reader.cc:15] Unable to read build ID header. Requested 8 bytes, 18424226071644201007 bytes remaining.
E0512 19:20:31.205049 8230 profile_creator.cc:78] Error reading profile.

When I debug:

breakpoint 1 : perf_reader.cc:1325 [data->SeekSet(section_iter->offset);]
breakpoint 2 : buffer_reader.cc:12 [if (offset_ + size > size_)]

breakpoint 1
section_iter->offset == 0x50000100000001
section_iter->size == 0xffffffff

breakpoint 2:
size_ == 0x15d7e030
size == 8
offset_ == 0x50000100000001

backtrace at breakpoint 2:
#0 quipper::BufferReader::ReadData (this=0x7fffffffd828, size=8, dest=0x7fffffffd498) at chromiumos-wide-profiling/buffer_reader.cc:12
#1 0x00000000005d917b in quipper::DataReader::ReadDataValue (this=0x7fffffffd828, size=8, , dest=0x7fffffffd498) at chromiumos-wide-profiling/data_reader.cc:13
#2 0x00000000005ab4a0 in quipper::PerfReader::ReadBuildIDMetadata (this=0x7fffffffdae8, data=0x7fffffffd828, size=4294967295) at chromiumos-wide-profiling/perf_reader.cc:1384
#3 0x00000000005a2a24 in quipper::PerfReader::ReadMetadata (this=0x7fffffffdae8, data=0x7fffffffd828) at chromiumos-wide-profiling/perf_reader.cc:1334
#4 0x00000000005a1842 in quipper::PerfReader::ReadFromData (this=0x7fffffffdae8, data=0x7fffffffd828) at chromiumos-wide-profiling/perf_reader.cc:706
#5 0x00000000005a116d in quipper::PerfReader::ReadFromPointer (this=0x7fffffffdae8, data=0x7fffe0907010 "PERFILE2h", size=366469168) at chromiumos-wide-profiling/perf_reader.cc:657
#6 0x00000000005a1121 in quipper::PerfReader::ReadFromVector (this=0x7fffffffdae8, ) at chromiumos-wide-profiling/perf_reader.cc:648
#7 0x00000000005a1092 in quipper::PerfReader::ReadFile (this=0x7fffffffdae8, ) at chromiumos-wide-profiling/perf_reader.cc:644
#8 0x00000000004379f1 in autofdo::PerfDataSampleReader::Append (this=0x9ccbc0, ) at sample_reader.cc:203
#9 0x0000000000436b36 in autofdo::FileSampleReader::Read (this=0x9ccbc0) at sample_reader.cc:89
#10 0x00000000004369ca in autofdo::SampleReader::ReadAndSetTotalCount (this=0x9ccbc0) at sample_reader.cc:72
#11 0x0000000000429fba in autofdo::ProfileCreator::ReadSample (this=0x7fffffffe140, , ) at profile_creator.cc:77
#12 0x000000000042a0f4 in autofdo::ProfileCreator::CreateProfile (this=0x7fffffffe140, , , writer=0x9c4dd0, ) at profile_creator.cc:45
#13 0x000000000045e88c in main (argc=1, argv=0x7fffffffe2d8) at create_llvm_prof.cc:78

[moshtalaghi]

any comments on how to proceed with this?

[dnovillo]

This may be the result of version drift. This code was written against Perf v 3.12. What version are you running?

[moshtalaghi]

that explains it.
mine is 2.6.32 running rhel-6.6
I'm not familiar with how perf is released. Does perf v 3.12 come only on higher version of linux?
or is there a place that I can download the sources for standalone perf build ?
obviously I found "https://github.com/torvalds/linux/tree/master/tools/perf" but this is not standalone

[dnovillo]

It's the internal version we use at Google, I'm not quite sure whether it
lines up with external revision numbers. Dehao?

On Mon, May 16, 2016 at 2:47 PM moshtalaghi notifications@github.com
wrote:

that explains it.
mine is 2.6.32 running rhel-6.6
I'm not familiar with how perf is released. Does perf v 3.12 come only on
higher version of linux?
or is there a place that I can download the sources for standalone perf
build ?
obviously I found "
https://github.com/torvalds/linux/tree/master/tools/perf" but this is not
standalone

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#34 (comment)

[moshtalaghi]

thanks

[danielcdh]

I think this should have been fixed by #65, pease re-open if otherwise.