Support zstd-compressed ELF sections. #626

khuey · 2024-05-25T00:57:05Z

zstd has been introduced as an alternative to zlib for the compression of debug sections.¹ Toolchain support is widely present at this time but lack of support in backtrace is a severe limitation on using this feature in Rust programs.

This uses a Rust reimplementation of zstd (the ruzstd crate). This has the benefit of simplifying the build process, but this crate is less used and admittedly slower than the zstd crate that binds to the C libzstd.

https://maskray.me/blog/2022-09-09-zstd-compressed-debug-sections ↩

workingjubilee · 2024-05-27T03:50:42Z

This itself will also wait for a bit due to dependency chains. I would rather not have two syns in my dependency tree, so I will be waiting for a version with KillingSpark/zstd-rs#60

bjorn3 · 2024-05-27T08:28:06Z

It also needs rustc-dep-of-std support, right?

workingjubilee · 2024-05-27T21:16:31Z

hmm probably.

workingjubilee · 2024-05-28T00:54:52Z

.github/workflows/main.yml

+    - run: cargo test
+      if: contains(matrix.os, 'ubuntu-24.04')
+      env:
+        RUSTFLAGS: "-C link-arg=-Wl,--compress-debug-sections=zstd"


workingjubilee · 2024-05-28T00:55:08Z

.github/workflows/main.yml

+          - os: ubuntu-24.04
+            rust: stable
+          - os: ubuntu-24.04
+            rust: beta
+          - os: ubuntu-24.04
+            rust: nightly


hmm, why are we bumping this? I kinda think we should just bump ahead to a recent ubuntu if we gotta?

--compress-debug-sections=zstd is only available in the binutils/etc that ships with 24.04, not with 20.04 or 22.04.

And no chance of installing that stuff on ubuntu 20 without exploding the world, huh?

I would be scared to try :)

If rust-lld propagates out to the stable branches I think it'll just work there though.

Oh cool. Can you give that a whirl against our CI for nightly + ubuntu 20.04, then?

Looks like that's rust-lang/rust#120953

...wait, can we just install lld and test with that or something? (not sure if that actually works out with all the versions involved...)

rust-lang/rust#125642 is also good lmao.

According to rust-lang/rust#124129 we can just use -Zlinker-features=-lld but I feel like rust-lld should be fixed.

workingjubilee · 2024-05-28T00:55:18Z

.github/workflows/main.yml

+    # Starting with Ubuntu 22.04 libc6-dbg is needed.
+    - name: Install libc debug info
+      run: sudo apt-get install -y libc6-dbg
+      shell: bash


which would make this unconditional.

workingjubilee · 2024-05-28T00:56:21Z

src/symbolize/gimli/elf.rs

+            match header.ch_type(self.endian) {
+                ELFCOMPRESS_ZLIB => {
+                    let size = usize::try_from(header.ch_size(self.endian)).ok()?;
+                    let buf = stash.allocate(size);
+                    decompress_zlib(data.0, buf)?;
+                    return Some(buf);
+                }
+                ELFCOMPRESS_ZSTD => {
+                    let size = usize::try_from(header.ch_size(self.endian)).ok()?;
+                    let buf = stash.allocate(size);
+                    decompress_zstd(data.0, buf)?;
+                    return Some(buf);
+                }
+                _ => return None, // Unknown compression type.


Yeah, the actual implementation seems basically fine.

workingjubilee · 2024-05-28T01:14:06Z

It's also ever-so-slightly nicer to be able to submit PRs to a Rust crate if I want their code to operate differently somehow (run faster, jump higher, whatever) rather than have to also dive into a tangled pile of C, y'know?

khuey · 2024-05-28T02:19:45Z

It's also ever-so-slightly nicer to be able to submit PRs to a Rust crate if I want their code to operate differently somehow (run faster, jump higher, whatever) rather than have to also dive into a tangled pile of C, y'know?

Personally I'd take the dependency that's professionally maintained and used by everyone else on the planet but it's not my crate.

workingjubilee · 2024-05-28T02:24:14Z

Alas, no one is really paying for professional maintenance of backtrace-rs, unfortunately.

khuey · 2024-08-13T01:57:23Z

Bleh, the new ruzstd also took an MSRV of 1.73.0. I don't suppose backtrace-rs could match that?

khuey · 2024-08-14T14:03:47Z

Bleh, the new ruzstd also took an MSRV of 1.73.0. I don't suppose backtrace-rs could match that?

@workingjubilee?

workingjubilee · 2024-08-19T13:07:57Z

Yes, we can raise MSRV as high as 1.78 if we need to.

khuey · 2024-08-19T14:36:25Z

So it seems like in order for CI in this repository to pass rustc's library/std/Cargo.toml needs to be updated too ...

workingjubilee · 2024-08-23T17:31:13Z

huh.

khuey · 2024-08-23T17:52:42Z

library/std does deeply sketchy things to build library/backtrace https://github.com/rust-lang/rust/blob/a60a9e567a7319b33619f6551dc29522c6f58687/library/std/src/lib.rs#L668. library/backtrace/Cargo.toml doesn't actually control building of backtrace-rs when it's built as part of rustc as a result.

workingjubilee · 2024-08-23T19:15:11Z

Right. Hm.

workingjubilee · 2024-08-23T19:15:20Z

I wonder if that's actually a requirement anymore...

workingjubilee · 2024-08-24T20:42:19Z

Answer is yes.

workingjubilee · 2024-08-24T20:45:14Z

@khuey Resolve the merge conflicts, please, and I will do what I must.

I do not want to publish versions of this crate that do not pass CI, and I cannot allow rust-lang/rust to break its CI, obviously, but I have the power to do what must be done to make this crate compile in rust-lang/rust and will make it happen.

khuey · 2024-08-24T22:41:26Z

Alright, done.

workingjubilee · 2024-08-25T17:45:57Z

I begin to absolutely despise how std defines io::Read.

workingjubilee · 2024-08-25T20:06:58Z

Right, so, the current problem, and this was going to be an issue with both the C-based zstd crate, and the ruzstd crate, is that the crate in question needs to participate in the horrible abomination that backtrace does if it's going to use types from std, including, say, std::io::Read.

This is a pretty invasive change and imo pretty unreasonable to ask anyone.

philipc · 2024-08-25T22:18:04Z

Is the problem that ruzstd still needs rustc-dep-of-std support? For example, gimli needed gimli-rs/gimli#503

workingjubilee · 2024-09-13T03:44:09Z

src/symbolize/gimli/elf.rs

+    use ruzstd::io::Read;
+
+    let mut decoder = ruzstd::StreamingDecoder::new(input).ok()?;
+    decoder.read_exact(output).ok()


So we're using read_exact here: why?

Hmm, because it should have the size information from before...

The ELF compression header includes the the decompressed size, so we know exactly how many bytes it should decompress to, and we've already allocated the buffer for that. So read_exact seems like the correct option to me. The only thing it is missing is an error check to ensure there aren't any more bytes left to read.

workingjubilee · 2024-09-13T04:08:58Z

@KillingSpark It seems that your decompressor either was incomplete or has become incomplete sometime in the last few zstd releases. That or we are somehow holding it wrong, which seems doubtful.

KillingSpark · 2024-09-13T06:07:11Z

I'll have a look

KillingSpark · 2024-09-13T06:57:12Z

Update: Running RUSTFLAGS="-C link-arg=-Wl,--compress-debug-sections=zstd" cargo test at home does not produce that error but completes the tests successfully.

I already did some light fiddling around to see if anything else is fishy. The zstd codepath is taken and the decoder produces the correct amount of bytes.

Running that same line against the master branch does produce the same error as in the CI though. Can you confirm these findings? Especially that the tests do run fine locally? I need to do something else for a few hours but I'll investigate this further later today

philipc · 2024-09-13T07:19:04Z

For stable rust, everything works as expected. The test on master fails because it lacks the zstd support added in this PR, but gimli's dwarfdump can read the test executable, and I've verified the ELF sections are zstd compressed.

For nightly rust, tests fail and unpatched gimli dwarfdump fails.

KillingSpark · 2024-09-13T12:31:30Z

Hi, so I'm pretty sure this is a bug in how the elf metadata is encoded.

The original and my library agree on what the decoded bytes should look like. The elf header says it should amount to 107961 bytes but both implementations decode only 107747. The test below fails on the last line saying:

assertion left == right failed: Was: 107747 expected: 107747, elf said: 107961

#[test]
fn test_stuff() {
    let mut src = [...]; // Insert bytes here, I have put them into the details below so this stays readable
    let expected = zstd::stream::decode_all(src).unwrap();
    let mut decoder = crate::FrameDecoder::new();
    decoder.init(&mut src).unwrap();
    decoder.decode_blocks(&mut src, crate::BlockDecodingStrategy::All);
    let output = decoder.collect().unwrap();
    assert!(decoder.is_finished());
    assert_eq!(output, expected);
    assert_eq!(107961, output.len(), "Was: {} expected: {}, elf said: {}", output.len(), expected.len(), 107961);
}

Is it possible that there is a regression in this part of rustc?

let mut src: &[u8] = &[ 40, 181, 47, 253, 160, 227, 164, 1, 0, 13, 133, 2, 58, 52, 201, 51, 51, 208, 70, 102, 118, 198, 33, 87, 51, 200, 234, 96, 68, 174, 6, 179, 172, 56, 46, 93, 66, 136, 192, 37, 37, 100, 102, 89, 186, 185, 187, 174, 207, 110, 50, 18, 1, 12, 100, 102, 178, 251, 46, 47, 98, 5, 140, 200, 1, 133, 76, 1, 59, 3, 56, 3, 9, 3, 135, 114, 115, 204, 252, 70, 21, 152, 29, 191, 198, 49, 217, 181, 157, 90, 54, 145, 68, 32, 15, 198, 66, 113, 204, 137, 145, 40, 196, 105, 225, 220, 120, 45, 148, 154, 54, 131, 185, 88, 218, 206, 74, 11, 47, 223, 89, 163, 156, 5, 241, 195, 113, 55, 142, 125, 211, 40, 49, 155, 72, 34, 119, 44, 48, 23, 75, 69, 190, 123, 236, 148, 180, 223, 224, 124, 251, 213, 185, 248, 29, 194, 115, 177, 84, 100, 23, 179, 75, 87, 103, 130, 50, 105, 191, 242, 226, 211, 40, 109, 103, 108, 225, 204, 160, 140, 64, 222, 50, 190, 184, 2, 243, 81, 39, 83, 137, 52, 18, 125, 236, 113, 199, 211, 248, 175, 88, 186, 227, 182, 31, 202, 71, 139, 109, 80, 126, 236, 233, 112, 54, 158, 38, 211, 194, 99, 46, 149, 75, 155, 18, 37, 145, 123, 142, 55, 24, 11, 5, 230, 68, 204, 98, 196, 67, 20, 2, 125, 60, 157, 111, 227, 101, 48, 23, 75, 69, 182, 157, 29, 215, 194, 185, 105, 148, 152, 181, 247, 38, 144, 39, 12, 140, 226, 247, 241, 124, 211, 222, 243, 52, 152, 139, 53, 74, 204, 38, 146, 136, 33, 15, 199, 255, 6, 99, 193, 154, 43, 21, 66, 10, 21, 79, 158, 75, 164, 143, 68, 237, 189, 208, 235, 233, 156, 227, 77, 107, 239, 154, 12, 230, 98, 121, 199, 125, 131, 143, 150, 180, 247, 34, 16, 63, 90, 40, 29, 239, 60, 153, 74, 164, 81, 11, 47, 98, 133, 14, 250, 104, 158, 14, 103, 227, 105, 50, 209, 210, 113, 155, 214, 58, 70, 32, 126, 56, 204, 88, 216, 156, 31, 9, 195, 163, 78, 166, 54, 126, 37, 147, 70, 22, 133, 64, 239, 156, 243, 205, 61, 205, 51, 152, 95, 218, 78, 217, 113, 91, 11, 165, 70, 137, 217, 68, 18, 129, 60, 28, 111, 48, 22, 10, 204, 137, 136, 129, 209, 64, 219, 21, 192, 42, 145, 70, 162, 16, 232, 138, 13, 74, 79, 219, 217, 225, 180, 80, 110, 90, 56, 61, 77, 6, 115, 177, 84, 186, 2, 106, 217, 113, 222, 180, 83, 98, 54, 177, 36, 98, 27, 254, 13, 198, 66, 129, 57, 145, 181, 19, 137, 31, 118, 188, 193, 88, 252, 127, 226, 35, 81, 8, 244, 105, 227, 231, 233, 216, 211, 180, 210, 149, 193, 248, 98, 105, 225, 172, 180, 157, 210, 215, 56, 5, 160, 132, 60, 28, 237, 227, 13, 198, 34, 70, 56, 222, 96, 180, 174, 200, 142, 219, 180, 137, 196, 145, 214, 241, 6, 163, 31, 232, 227, 233, 180, 157, 156, 141, 167, 201, 96, 46, 150, 22, 202, 138, 165, 59, 115, 222, 180, 83, 62, 81, 120, 154, 12, 230, 98, 105, 227, 39, 59, 110, 211, 40, 143, 143, 17, 210, 213, 25, 129, 60, 28, 140, 133, 66, 147, 193, 92, 44, 174, 92, 118, 109, 252, 184, 173, 149, 174, 107, 237, 189, 162, 40, 49, 155, 64, 30, 14, 233, 242, 253, 105, 59, 61, 29, 206, 198, 211, 100, 56, 76, 11, 229, 197, 22, 87, 218, 168, 146, 29, 247, 216, 194, 103, 147, 246, 158, 36, 2, 241, 195, 142, 55, 24, 11, 69, 228, 2, 49, 80, 81, 66, 30, 32, 70, 192, 132, 52, 64, 49, 191, 88, 62, 217, 113, 91, 219, 169, 181, 112, 82, 98, 54, 145, 68, 32, 15, 199, 27, 140, 133, 162, 149, 46, 108, 161, 48, 214, 218, 79, 252, 41, 212, 169, 61, 132, 199, 212, 94, 225, 193, 137, 17, 221, 148, 218, 24, 1, 33, 105, 212, 40, 10, 129, 252, 177, 199, 29, 115, 54, 92, 1, 181, 167, 201, 180, 247, 48, 191, 88, 42, 44, 201, 41, 16, 85, 16, 211, 177, 184, 111, 215, 90, 74, 108, 165, 43, 107, 59, 39, 101, 73, 90, 248, 8, 164, 133, 243, 209, 126, 229, 104, 161, 124, 219, 104, 191, 65, 201, 104, 37, 171, 143, 69, 27, 53, 56, 21, 152, 89, 254, 32, 170, 59, 23, 129, 11, 176, 182, 246, 90, 27, 85, 93, 1, 53, 165, 253, 0, 92, 128, 19, 0, 203, 224, 36, 170, 32, 38, 58, 107, 227, 55, 105, 177, 25, 35, 26, 145, 180, 17, 72, 139, 205, 200, 195, 81, 191, 133, 24, 136, 17, 77, 53, 206, 104, 99, 68, 189, 104, 165, 75, 209, 126, 245, 133, 8, 92, 32, 70, 64, 12, 244, 129, 181, 17, 184, 192, 87, 63, 196, 0, 140, 110, 189, 24, 97, 78, 129, 182, 255, 33, 32, 6, 234, 113, 27, 35, 186, 2, 234, 68, 123, 135, 55, 64, 12, 64, 16, 208, 29, 192, 50, 56, 129, 40, 3, 45, 196, 0, 100, 40, 160, 197, 50, 56, 129, 88, 56, 9, 196, 128, 35, 228, 3, 39, 48, 22, 213, 109, 248, 68, 252, 80, 241, 11, 113, 14, 167, 38, 83, 145, 29, 183, 217, 145, 95, 186, 140, 57, 113, 91, 118, 220, 166, 81, 176, 12, 230, 98, 217, 198, 79, 179, 227, 39, 121, 56, 26, 118, 35, 97, 213, 17, 82, 168, 147, 73, 243, 52, 25, 107, 45, 60, 197, 209, 155, 246, 6, 3, 155, 78, 220, 70, 253, 215, 22, 180, 213, 20, 180, 80, 75, 128, 224, 192, 11, 226, 225, 174, 22, 155, 14, 13, 102, 112, 171, 237, 76, 184, 17, 80, 167, 104, 42, 145, 70, 162, 86, 186, 14, 250, 248, 135, 183, 220, 147, 49, 155, 72, 32, 138, 152, 77, 36, 93, 40, 176, 59, 1, 143, 144, 66, 157, 76, 37, 210, 72, 116, 79, 243, 85, 69, 122, 179, 89, 145, 31, 106, 15, 174, 54, 126, 14, 13, 12, 11, 10, 173, 39, 204, 182, 115, 213, 194, 169, 66, 72, 161, 90, 40, 79, 38, 151, 224, 165, 203, 158, 14, 199, 27, 99, 46, 150, 202, 55, 205, 20, 199, 76, 226, 7, 227, 255, 57, 239, 252, 229, 102, 255, 127, 54, 145, 216, 199, 52, 45, 148, 153, 246, 23, 75, 69, 118, 148, 199, 204, 17, 67, 30, 14, 55, 48, 44, 40, 180, 18, 206, 98, 205, 175, 254, 148, 169, 68, 234, 20, 133, 90, 56, 65, 31, 79, 11, 101, 135, 179, 241, 142, 185, 200, 206, 154, 255, 75, 34, 118, 180, 134, 103, 120, 113, 111, 65, 161, 149, 192, 154, 55, 189, 212, 158, 52, 18, 133, 156, 241, 238, 193, 41, 91, 248, 78, 187, 165, 107, 241, 131, 62, 30, 111, 188, 54, 126, 154, 12, 230, 98, 169, 72, 141, 18, 179, 137, 37, 118, 216, 131, 199, 156, 248, 66, 145, 192, 82, 161, 78, 166, 18, 41, 100, 144, 63, 173, 59, 230, 104, 50, 152, 255, 231, 224, 53, 202, 87, 103, 161, 78, 166, 18, 9, 206, 79, 11, 165, 167, 195, 201, 220, 143, 246, 127, 155, 225, 233, 112, 54, 240, 206, 216, 166, 68, 20, 213, 100, 108, 141, 226, 123, 63, 102, 142, 50, 105, 225, 37, 94, 40, 48, 39, 70, 22, 133, 142, 205, 142, 151, 177, 202, 226, 31, 202, 172, 133, 247, 61, 5, 230, 104, 56, 129, 205, 72, 252, 191, 65, 51, 22, 9, 120, 16, 103, 83, 145, 92, 54, 185, 228, 17, 59, 254, 54, 170, 26, 86, 24, 179, 29, 26, 24, 190, 112, 133, 183, 18, 218, 248, 177, 230, 74, 133, 144, 66, 117, 154, 74, 164, 17, 124, 8, 244, 81, 108, 210, 211, 100, 42, 150, 142, 206, 38, 18, 71, 124, 8, 2, 186, 2, 34, 112, 1, 59, 188, 33, 70, 172, 58, 156, 141, 215, 118, 106, 50, 152, 203, 101, 247, 205, 17, 67, 30, 237, 207, 106, 208, 198, 143, 193, 130, 43, 72, 208, 194, 137, 224, 64, 11, 255, 106, 59, 33, 218, 63, 216, 229, 208, 192, 224, 5, 5, 183, 90, 39, 156, 117, 67, 4, 167, 74, 23, 125, 60, 29, 13, 115, 169, 200, 142, 219, 218, 123, 166, 184, 149, 192, 154, 171, 171, 16, 226, 119, 34, 29, 202, 16, 8, 222, 156, 141, 237, 223, 82, 185, 252, 118, 136, 223, 96, 176, 230, 170, 141, 159, 10, 33, 117, 83, 105, 36, 10, 129, 90, 233, 146, 46, 142, 55, 158, 47, 173, 236, 156, 53, 74, 26, 137, 66, 160, 15, 199, 156, 39, 93, 23, 203, 181, 83, 98, 214, 66, 57, 105, 225, 148, 64, 38, 27, 79, 147, 193, 92, 44, 156, 227, 237, 226, 93, 2, 115, 177, 84, 218, 232, 120, 227, 247, 183, 48, 148, 156, 141, 167, 177, 84, 46, 189, 101, 159, 252, 143, 47, 220, 113, 155, 22, 31, 14, 70, 231, 133, 179, 205, 249, 158, 198, 23, 75, 81, 91, 54, 145, 68, 22, 10, 77, 11, 159, 249, 31, 191, 59, 123, 56, 222, 96, 168, 16, 218, 248, 165, 80, 37, 210, 200, 30, 119, 56, 27, 123, 93, 11, 39, 183, 65, 73, 105, 191, 69, 32, 127, 163, 229, 22, 10, 204, 141, 78, 20, 2, 125, 60, 29, 207, 24, 163, 184, 63, 222, 126, 131, 177, 80, 136, 66, 30, 119, 56, 173, 116, 109, 126, 177, 84, 100, 199, 109, 218, 41, 209, 153, 39, 146, 55, 236, 159, 53, 191, 82, 25, 129, 149, 66, 253, 100, 122, 169, 141, 31, 9, 155, 162, 16, 232, 227, 145, 46, 219, 150, 202, 61, 9, 19, 112, 110, 227, 52, 74, 123, 47, 107, 161, 237, 56, 148, 149, 45, 102, 19, 73, 4, 242, 112, 144, 64, 159, 205, 127, 99, 46, 183, 184, 227, 20, 112, 230, 7, 105, 212, 198, 15, 244, 241, 116, 90, 56, 57, 109, 167, 141, 169, 4, 10, 173, 246, 222, 60, 130, 71, 162, 135, 56, 127, 167, 111, 41, 97, 205, 149, 85, 79, 161, 92, 50, 233, 55, 72, 229, 249, 226, 156, 205, 61, 40, 237, 55, 24, 247, 143, 242, 13, 231, 15, 207, 93, 186, 238, 96, 216, 126, 10, 117, 50, 149, 72, 33, 208, 199, 158, 14, 6, 206, 27, 99, 60, 241, 191, 170, 141, 45, 20, 91, 98, 133, 226, 111, 48, 22, 10, 204, 78, 120, 242, 55, 24, 95, 153, 97, 39, 204, 154, 43, 213, 201, 170, 146, 69, 191, 89, 183, 89, 222, 34, 16, 56, 207, 114, 137, 4, 165, 109, 103, 140, 249, 255, 127, 149, 178, 79, 185, 51, 238, 172, 69, 238, 132, 51, 99, 112, 222, 94, 88, 145, 176, 116, 220, 38, 97, 2, 36, 39, 141, 68, 33, 208, 109, 233, 44, 105, 252, 254, 63, 158, 47, 99, 204, 197, 126, 226, 166, 151, 72, 15, 121, 58, 151, 49, 83, 96, 78, 252, 118, 194, 159, 38, 127, 43, 160, 252, 118, 195, 99, 46, 210, 127, 130, 235, 184, 255, 170, 198, 25, 139, 195, 219, 190, 228, 129, 165, 80, 39, 83, 137, 52, 18, 133, 60, 63, 156, 210, 117, 185, 246, 79, 36, 17, 200, 223, 96, 216, 254, 234, 67, 72, 161, 78, 166, 95, 20, 50, 199, 150, 153, 125, 51, 252, 109, 141, 209, 167, 189, 239, 201, 27, 222, 255, 183, 117, 98, 87, 104, 57, 193, 172, 95, 133, 144, 66, 137, 66, 32, 251, 219, 120, 158, 240, 26, 229, 219, 231, 248, 39, 228, 209, 196, 55, 31, 230, 82, 145, 157, 111, 27, 26, 116, 108, 110, 156, 185, 191, 105, 166, 248, 54, 196, 246, 27, 226, 231, 195, 171, 224, 52, 221, 251, 61, 79, 115, 159, 99, 220, 246, 223, 120, 226, 247, 183, 251, 30, 227, 11, 144, 55, 158, 166, 139, 178, 243, 37, 191, 29, 13, 165, 130, 59, 37, 94, 225, 127, 157, 185, 206, 133, 66, 18, 193, 102, 3, 178, 236, 145, 69, 182, 5, 78, 5, 198, 41, 240, 149, 175, 50, 235, 211, 171, 255, 62, 181, 81, 101, 42, 145, 28, 191, 204, 13, 109, 134, 39, 109, 227, 11, 219, 159, 116, 137, 218, 206, 16, 7, 250, 156, 115, 255, 149, 115, 222, 172, 81, 238, 121, 98, 67, 30, 138, 196, 127, 204, 197, 114, 251, 106, 161, 192, 30, 157, 148, 22, 202, 99, 241, 254, 197, 223, 78, 121, 164, 253, 255, 197, 198, 211, 200, 107, 182, 239, 114, 104, 96, 88, 80, 232, 16, 82, 168, 206, 82, 11, 39, 201, 211, 225, 108, 50, 246, 43, 151, 183, 93, 225, 254, 9, 99, 161, 112, 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31, 36, 241, 226, 153, 168, 89, 145, 75, 92, 42, 181, 168, 242, 190, 192, 12, 143, 249, 1, ];

khuey · 2024-09-13T13:38:59Z

Is it possible that there is a regression in this part of rustc?

Nightly uses lld, while stable/beta use the system linker which is usually ld.bfd.

KillingSpark · 2024-09-13T14:06:26Z

Yeah no I f'ed up getting the right sample sorry about that. I have a sample now that shows a diff between my libary and what zstd decodes. I'll report back when I know more...

khuey · 2024-09-13T14:22:35Z

I think there's something wrong with the streaming part of the decoder.

khuey@zhadum:~/dev/backtrace-rs$ ~/dev/ruzstd/target/debug/zstd -d bad.debug-info -c > bad.ruzstd-out    File: bad.debug-info
100 % done
Decoded frames: 4  bytes: 4073553
No checksums to test
khuey@zhadum:~/dev/backtrace-rs$ ~/dev/ruzstd/target/debug/zstd_stream -d bad.debug-info -c > bad.ruzstd-out-stream
File: bad.debug-info
khuey@zhadum:~/dev/backtrace-rs$ ls -al bad.ruzstd-out*
-rw-rw-r-- 1 khuey khuey 4073553 Sep 13 07:22 bad.ruzstd-out
-rw-rw-r-- 1 khuey khuey 1048576 Sep 13 07:22 bad.ruzstd-out-stream

KillingSpark · 2024-09-13T14:28:56Z

Yeah the issue is just that the meta info is broken up into multiple frames for some reason...

KillingSpark · 2024-09-13T14:34:49Z

This seems to fix it:

fn decompress_zstd(input: &[u8], output: &mut [u8]) -> Option<()> {
    use ruzstd::io::Read;

    let mut input = input;
    let mut output = output;

    while !input.is_empty() {
        let mut decoder = ruzstd::StreamingDecoder::new(&mut input).ok()?;
        loop {
            match decoder.read(output) {
                Err(_) => return None,
                Ok(0) => break,
                Ok(read) => output = &mut output[read..],
            }
        }
    }

    assert!(output.is_empty());

    Some(())
}

This multi-frame thing has been an issue a few times. But I am not a big fan of silently decoding multiple frames with just one call. Maybe I need to rethink my position on this it seems more widespread than I thought.

Edit: To be fair, this is documented on the StreamingDecoder ;)

khuey · 2024-09-13T15:55:03Z

lld does indeed do 1MB frames for parallel compression https://github.com/llvm/llvm-project/blob/ffeb793f3a90623ab3c7f33f922d48a1f5f97cdf/lld/ELF/OutputSections.cpp#L378

lld chunks the data into 1MB frames for parallel compression so almost everything will have multiple frames.

KillingSpark · 2024-09-13T16:14:44Z

While you're at it you might want to handle skippable frames too (as mentioned in the doc). This will return an ReadFrameHeaderError::SkipFrame telling you the magic number and how many bytes to skip. I guess if multiple frames are allowed in one elf section then a skippable frame is probably allowed too.

khuey · 2024-09-13T16:57:28Z

@workingjubilee The binary size thing seems misconfigured or messed up or something. It's trying to build LLVM and it says "Detected LLVM as non-available: running in CI and modified LLVM in this change"

khuey · 2024-09-13T17:28:58Z

While you're at it you might want to handle skippable frames too (as mentioned in the doc). This will return an ReadFrameHeaderError::SkipFrame telling you the magic number and how many bytes to skip. I guess if multiple frames are allowed in one elf section then a skippable frame is probably allowed too.

May as well handle them while we're here I suppose. Done.

khuey · 2024-09-13T17:37:24Z

Edit: To be fair, this is documented on the StreamingDecoder ;)

Indeed it is. I suppose the idea is that StreamingDecoder is the equivalent of ZSTD_decompressStream. It is a bit surprising that there's no out-of-the-box equivalent to ZSTD_decompress(). Nevertheless what we have now works, so I'm satisfied. Thanks again for all your help on this stuff.

KillingSpark · 2024-09-13T17:43:48Z

No problem! I'm exited to get more usage out of the crate.

I do see the problem with not meeting the expectations the original implementation builds. But I also disagree deeply with endlessly decoding from a source. I'll have to think about this as it has become an issue more than once

workingjubilee · 2024-09-13T20:10:01Z

@workingjubilee The binary size thing seems misconfigured or messed up or something. It's trying to build LLVM and it says "Detected LLVM as non-available: running in CI and modified LLVM in this change"

Yeah don't worry about the binary size workflow. I might try to hit it with a wrench a few times to see if I can get it working before merging this, but I won't block this on it. Just gotta review the revised implementation and then it's in assuming nothing jumps out.

workingjubilee

Yeah, not going to block this on that workflow, as I said.

workingjubilee · 2024-09-15T04:47:28Z

src/symbolize/gimli/elf.rs

+    while !input.is_empty() {
+        let mut decoder = match ruzstd::StreamingDecoder::new(&mut input) {
+            Ok(decoder) => decoder,
+            Err(FrameDecoderError::ReadFrameHeaderError(ReadFrameHeaderError::SkipFrame {


mmmmmmm... that sure is a pattern that is being matched...

khuey · 2024-09-15T16:00:48Z

Thanks!

khuey mentioned this pull request May 25, 2024

Support zstd-compressed ELF sections. #625

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khuey force-pushed the ruzstd branch from 3e2fb69 to cc9ebc5 Compare May 28, 2024 02:37

nyurik mentioned this pull request Aug 2, 2024

Apply some of the cargo clippy suggestions #649

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khuey force-pushed the ruzstd branch from cc9ebc5 to c97a931 Compare August 13, 2024 01:52

workingjubilee added S-merge-conflicts S-waiting-on-upstream labels Aug 24, 2024

khuey force-pushed the ruzstd branch 2 times, most recently from 39706c7 to 45dc6bd Compare August 24, 2024 22:41

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workingjubilee reviewed Sep 13, 2024

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khuey added 2 commits September 13, 2024 09:04

Work around ruzstd only decoding a single frame of the zstd data.

b0ae948

lld chunks the data into 1MB frames for parallel compression so almost everything will have multiple frames.

Run zstd tests on Linux nightlies but not on other platforms.

8d94e0d

MSRV bump for next_multiple_of in ruzstd.

e5473c3

Handle skip frame errors.

fbfaf5a

khuey mentioned this pull request Sep 13, 2024

read/elf: Read zstd frames in a loop until decompression is complete. gimli-rs/object#730

Merged

workingjubilee removed the S-waiting-on-upstream label Sep 13, 2024

workingjubilee mentioned this pull request Sep 13, 2024

Should StreamingDecoder::read_exact prefer Read::read_exact's contract over its own? KillingSpark/zstd-rs#69

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workingjubilee closed this Sep 14, 2024

workingjubilee reopened this Sep 14, 2024

workingjubilee approved these changes Sep 15, 2024

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workingjubilee merged commit 4f3acf7 into rust-lang:master Sep 15, 2024
84 of 88 checks passed

Support zstd-compressed ELF sections. #626

Support zstd-compressed ELF sections. #626

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