No data from the proto profile? about pprof-rs

[YangKeao]

I have tried to get the profile on my Linux machine. You can download it here and verity whether it's correct.

I belive the illegal instruction should be an issue in rust (though I don't know whether it has connection with existing bugs such as #58340) as I don't write any pure instructions or binary codes. To indentify this problem, a backtrace or coredump will help a lot.

However, pprof-rs is expected to work correctly on Mac. @Hexilee can you help me on this issue (as I don't have a mac 😿 ) ?

[Hexilee]

@jabley Hello, I cannot reproduce this issue on my macOS.

I get the profile on
cargo 1.44.1 (88ba85757 2020-06-11) and rustc 1.44.1 (c7087fe00 2020-06-17) by cargo run --bin vm-flamegraph --release -- -p profile.pb.

Are you sure your reproducing steps are correct?

[jabley]

On a different Mac, I've just done:

> git clone [email protected]:jabley/monkeyinterpreter.git
> pushd monkeyinterpreter
> git checkout feature/pprof
> pushd rust/rmonkey/
> cargo run --bin vm-flamegraph --release -- -p profile.pb
Result: 9227465
report: THREAD: ThreadId(4757824960) 2000

I get the same 26 byte profile.pb output file as described in my original report.

I can run the examples from pprof-rs and get usable profiles produced.

@Hexilee, your profile looks like what I'd expect.

[sticnarf]

I try your code on my 10.14.6 macOS with the same toolchain and can get the profile successfully. @Hexilee uses macOS 10.15.
We have no idea how to reproduce the issue.

[kjvalencik]

I'm having this same issue on macOS 11.0.1. Have you had any success identifying the issue? I appear to only have the issue with --release.

I'm on v1.50.0-nightly.

Edit: Compiling with --release and debug = true works.

[YangKeao]

@kjvalencik AFAIK, debug = false will also keep the symbol information, unless it has been stripped explicitly. Would you mind to check whether the symbol information exists in the binary compiled with debug = false?

nm ./target/release/examples/xxx could be used to print the symbol information. If it has been stripped, the output would be nm: ./target/release/examples/xxx: no symbols. (However, I don't know whether Mac OS has nm command).

I heard that @sticnarf has got a new Mac OS laptop 🍻 . Maybe he could help us to find the problem.

[kjvalencik]

@YangKeao I had symbols in both, but I had 7 more when compiling with debug = true.