proc macro server crashes for certain macros

Continuation from https://www.reddit.com/r/rust/comments/makwv3/rustanalyzer_changelog_69/grt1kul?utm_source=share&utm_medium=web2x&context=3

For some reason the embed_compiler macro from tealr_derive causes the macro server to crash for me. I think I nailed it down to that macro specifically because it only crashes if I have the test for that macro open. The moment I have that test file open the server crashes and a macro that used to work will give me the same error from that point onwards. Only way to get back to a working state is by closing the embed_compiler test file and telling vscode to reload the window.

The proc macro that causes the problem: https://github.com/lenscas/tealr/blob/cee2363a14c53b995a69efb2b4cbd84010905276/tealr_derive/src/lib.rs#L242

the test that causes the crash: https://github.com/lenscas/tealr/blob/master/tealr/tests/embed_teal.rs
The test that doesn't crash:https://github.com/lenscas/tealr/blob/master/tealr/tests/function_wrapper.rs

For what it is worth, the compile_inline_teal macro gives me the type &{unknown} back according to rust analyzer.

For me, compile_inline_teal! crashes because of the println! at https://github.com/lenscas/tealr/blob/cee2363a14c53b995a69efb2b4cbd84010905276/tealr_derive/src/lib.rs#L155:

[ERROR proc_macro_api::process] proc macro server crashed, server process state: Ok(None), server request error: Custom { kind: InvalidData, error: Error("unknown variant `/home/me/tealr/tealr`, expected one of `Error`, `ListMacro`, `ExpansionMacro`", line: 1, column: 29) }

I also get some errors on embed_compiler!:

lua: tl:17: module 'argparse' not found:
	no field package.preload['argparse']
	no file '/usr/share/lua/5.4/argparse.lua'
	no file '/usr/share/lua/5.4/argparse/init.lua'
	no file '/usr/lib/lua/5.4/argparse.lua'
	no file '/usr/lib/lua/5.4/argparse/init.lua'
	no file './argparse.lua'
	no file './argparse/init.lua'
	no file '/usr/lib/lua/5.4/argparse.so'
	no file '/usr/lib/lua/5.4/loadall.so'
	no file './argparse.so'
stack traceback:
	[C]: in function 'require'
	tl:17: in main chunk
	[C]: in ?

I'm probably missing some lua libraries.

To be clear, the println! is a bad idea because we use stdout for IPC between the proc macro server and the main binary. If you print random stuff to the console, you're injecting it into our communication protocol.

(marking actionable because we can 1. make the protocol more resilient and 2. someone might still be able to reproduce the other crash, perhaps by installing lua).

To be clear, the println! is a bad idea because we use stdout for IPC between the proc macro server and the main binary. If you print random stuff to the console, you're injecting it into our communication protocol.

Ah, didn't know that. So, I should also capture every output from the commands being run, or is stderr safe to not capture?

Weird however that compile_inline_teal works for me. As for the lua dependencies, you need tl installed through luarocks, or just its dependencies and comment out the Loca() version. Then the only tests left are the ones that download it themselves instead of relying on a local install.

To be clear, the println! is a bad idea because we use stdout for IPC between the proc macro server and the main binary. If you print random stuff to the console, you're injecting it into our communication protocol.

cc #7954

I'm getting a similar "proc macro server crashed" issue, when doing e.g. derive(Serialize).

At first I thought it might have been in relation to using Rust 1.43.0 where I work, but switching to 1.50.0 and the issue persists.

Running "Show RA Version" and it displays nothing after "rust-analyzer version:". However, it first started occurring after the latest stable release.

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Debug)]
pub enum FooBar {
    Foo,
    Bar,
}

@vallentin

@vallentin Any error in vscode output ? Because I can't reproduce it in my pc.

@edwin0cheng

@edwin0cheng For some reason adding the above snippet to a new project, and I can't reproduce it either. But in my existing project it does. I'll see if I can create a MCVE.

In case it's relevant I'm running WSL + Ubuntu.

Anyways, if I look in "Output" then I see the following:

proc-macro /home/vallentin/work/playground/y21w12/target/debug/deps/libserde_derive-f53128d657754e5e.so failed to find the given version. Reason: snappy: corrupt input (expected stream header but got unexpected chunk type byte 188)
proc-macro /home/vallentin/work/playground/y21w12/target/debug/deps/libserde_derive-f53128d657754e5e.so failed to find the given version. Reason: snappy: corrupt input (expected stream header but got unexpected chunk type byte 188)
thread 'main' panicked at 'internal error: entered unreachable code', crates/proc_macro_srv/src/proc_macro/bridge/mod.rs:259:5
stack backtrace:
   0: rust_begin_unwind
             at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:493:5
   1: core::panicking::panic_fmt
             at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/core/src/panicking.rs:92:14
   2: core::panicking::panic
             at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/core/src/panicking.rs:50:5
   3: <proc_macro_srv::proc_macro::bridge::api_tags::Method as proc_macro_srv::proc_macro::bridge::rpc::DecodeMut<S>>::decode
   4: <proc_macro_srv::proc_macro::bridge::server::Dispatcher<proc_macro_srv::proc_macro::bridge::server::MarkedTypes<S>> as proc_macro_srv::proc_macro::bridge::server::DispatcherTrait>::dispatch
   5: <proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call
   6: proc_macro::bridge::closure::Closure<A,R>::call
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/closure.rs:27:18
   7: proc_macro::bridge::client::TokenStream::into_iter::{{closure}}
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:237:25
   8: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:321:47
   9: proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:286:17
  10: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/scoped_cell.rs:74:9
  11: proc_macro::bridge::client::BridgeState::with::{{closure}}
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:284:13
  12: std::thread::local::LocalKey<T>::try_with
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libstd/thread/local.rs:263:16
  13: std::thread::local::LocalKey<T>::with
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libstd/thread/local.rs:239:9
  14: proc_macro::bridge::client::BridgeState::with
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:283:9
  15: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:314:9
  16: proc_macro::bridge::client::TokenStream::into_iter
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:230:17
  17: proc_macro::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro::TokenStream>::into_iter
             at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/lib.rs:226:22
  18: <proc_macro2::imp::TokenStream as core::iter::traits::collect::IntoIterator>::into_iter
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/wrapper.rs:292:41
  19: proc_macro2::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro2::TokenStream>::into_iter
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/lib.rs:1229:24
  20: syn::buffer::TokenBuffer::inner_new
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/buffer.rs:53:19
  21: syn::buffer::TokenBuffer::new2
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/buffer.rs:112:9
  22: <F as syn::parse::Parser>::parse2
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/parse.rs:1207:19
  23: syn::parse::Parser::parse
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/parse.rs:1161:9
  24: syn::parse_macro_input::parse
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/parse_macro_input.rs:139:5
  25: serde_derive::derive_serialize
             at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.124/src/lib.rs:85:21
  26: core::ops::function::FnOnce::call_once
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
  27: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::{{closure}}
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:394:40
  28: proc_macro::bridge::client::run_client::{{closure}}::{{closure}}
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:362:26
  29: proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/scoped_cell.rs:79:33
  30: proc_macro::bridge::scoped_cell::ScopedCell<T>::replace
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/scoped_cell.rs:74:9
  31: proc_macro::bridge::scoped_cell::ScopedCell<T>::set
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/scoped_cell.rs:79:9
  32: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:310:35
  33: std::thread::local::LocalKey<T>::try_with
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:263:16
  34: std::thread::local::LocalKey<T>::with
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:239:9
  35: proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:310:9
  36: proc_macro::bridge::client::run_client::{{closure}}
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:355:9
  37: <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:318:9
  38: std::panicking::try::do_call
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:331:40
  39: __rust_try
  40: std::panicking::try
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
  41: std::panic::catch_unwind
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
  42: proc_macro::bridge::client::run_client
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:354:5
  43: proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run
             at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:394:13
  44: proc_macro_srv::proc_macro::bridge::server::run_server
  45: proc_macro_srv::dylib::Expander::expand
  46: proc_macro_srv::ProcMacroSrv::expand
  47: proc_macro_srv::cli::run
  48: rust_analyzer::main
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at 'internal error: entered unreachable code', crates/proc_macro_srv/src/proc_macro/bridge/mod.rs:259:5
stack backtrace:
   0:     0x55e41c193e70 - std::backtrace_rs::backtrace::libunwind::trace::h25e12e0d899beba0
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/../../backtrace/src/backtrace/libunwind.rs:90:5
   1:     0x55e41c193e70 - std::backtrace_rs::backtrace::trace_unsynchronized::h70e61195d6ae3df6
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:     0x55e41c193e70 - std::sys_common::backtrace::_print_fmt::hba93ab80d779695a
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/sys_common/backtrace.rs:67:5
   3:     0x55e41c193e70 - <std::sys_common::backtrace::_print::DisplayBacktrace as core::fmt::Display>::fmt::hf092b5883b4b2e50
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/sys_common/backtrace.rs:46:22
   4:     0x55e41c1b940c - core::fmt::write::hf68bc350a8f2f0dc
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/core/src/fmt/mod.rs:1078:17
   5:     0x55e41c18d9d2 - std::io::Write::write_fmt::hf66811b1bc767436
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/io/mod.rs:1517:15
   6:     0x55e41c1962b5 - std::sys_common::backtrace::_print::hd425a11bfe1f20f8
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/sys_common/backtrace.rs:49:5
   7:     0x55e41c1962b5 - std::sys_common::backtrace::print::h6d678795c1e61e13
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/sys_common/backtrace.rs:36:9
   8:     0x55e41c1962b5 - std::panicking::default_hook::{{closure}}::h78a02a4a0dee5e7e
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:208:50
   9:     0x55e41c195e0a - std::panicking::default_hook::h56eb7eda02f355a7
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:225:9
  10:     0x55e41c196a51 - std::panicking::rust_panic_with_hook::hb27ea14285131c61
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:591:17
  11:     0x55e41c196567 - std::panicking::begin_panic_handler::{{closure}}::hc552fcee62aad17f
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:495:13
  12:     0x55e41c19432c - std::sys_common::backtrace::__rust_end_short_backtrace::hb9f0aa9a78e885a0
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/sys_common/backtrace.rs:141:18
  13:     0x55e41c1964f9 - rust_begin_unwind
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:493:5
  14:     0x55e41c1b6911 - core::panicking::panic_fmt::h12ac4570ea43d06f
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/core/src/panicking.rs:92:14
  15:     0x55e41c1b685d - core::panicking::panic::h72bd72f6f4a70105
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/core/src/panicking.rs:50:5
  16:     0x55e41b3e1970 - <proc_macro_srv::proc_macro::bridge::api_tags::Method as proc_macro_srv::proc_macro::bridge::rpc::DecodeMut<S>>::decode::h4c592e514f3a91b1
  17:     0x55e41b408937 - <proc_macro_srv::proc_macro::bridge::server::Dispatcher<proc_macro_srv::proc_macro::bridge::server::MarkedTypes<S>> as proc_macro_srv::proc_macro::bridge::server::DispatcherTrait>::dispatch::h1874d101c3c17936
  18:     0x55e41b3dea73 - <proc_macro_srv::proc_macro::bridge::closure::Closure<A,R> as core::convert::From<&mut F>>::from::call::hf7ced204bc6fe8a6
  19:     0x7f2527097991 - proc_macro::bridge::closure::Closure<A,R>::call::hae9870fd59b0f7c4
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/closure.rs:27:18
  20:     0x7f2527097991 - proc_macro::bridge::client::TokenStream::into_iter::{{closure}}::h01fdbc3fddd2890f
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:237:25
  21:     0x7f2527097991 - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::{{closure}}::hefa6cdaf7d99028c
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:321:47
  22:     0x7f2527097991 - proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}}::h88630f5a811dace2
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:286:17
  23:     0x7f2527097991 - proc_macro::bridge::scoped_cell::ScopedCell<T>::replace::hd61bc19f0d534815
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/scoped_cell.rs:74:9
  24:     0x7f2527097991 - proc_macro::bridge::client::BridgeState::with::{{closure}}::h6b8047b77a747616
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:284:13
  25:     0x7f2527097991 - std::thread::local::LocalKey<T>::try_with::ha24fa19947dcf188
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libstd/thread/local.rs:263:16
  26:     0x7f2527097991 - std::thread::local::LocalKey<T>::with::h3936055334cd0934
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libstd/thread/local.rs:239:9
  27:     0x7f2527097991 - proc_macro::bridge::client::BridgeState::with::hb50a65a1db57332d
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:283:9
  28:     0x7f2527097991 - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::with::h4ddb34cae1050a7e
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:314:9
  29:     0x7f2527097991 - proc_macro::bridge::client::TokenStream::into_iter::hd093eef7555c14bf
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/bridge/client.rs:230:17
  30:     0x7f2527097991 - proc_macro::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro::TokenStream>::into_iter::hfbe2ddba63702bd7
                               at /rustc/49cae55760da0a43428eba73abcb659bb70cf2e4/src/libproc_macro/lib.rs:226:22
  31:     0x7f252706c0cc - <proc_macro2::imp::TokenStream as core::iter::traits::collect::IntoIterator>::into_iter::h639b0b9d28e2545a
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/wrapper.rs:292:41
  32:     0x7f2527075139 - proc_macro2::token_stream::<impl core::iter::traits::collect::IntoIterator for proc_macro2::TokenStream>::into_iter::hd204b0a882113219
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-1.0.24/src/lib.rs:1229:24
  33:     0x7f252701606b - syn::buffer::TokenBuffer::inner_new::h60536052bad27dae
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/buffer.rs:53:19
  34:     0x7f2527016cdd - syn::buffer::TokenBuffer::new2::ha15528a044e9b140
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/buffer.rs:112:9
  35:     0x7f2526efda93 - <F as syn::parse::Parser>::parse2::hcdf1469fb156b740
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/parse.rs:1207:19
  36:     0x7f2526efd9ea - syn::parse::Parser::parse::h0417ce86f6a18876
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/parse.rs:1161:9
  37:     0x7f2526efd978 - syn::parse_macro_input::parse::h98a3e78fa47ad320
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-1.0.64/src/parse_macro_input.rs:139:5
  38:     0x7f2526f0d792 - serde_derive::derive_deserialize::h77aa9b5e1e5db025
                               at /home/vallentin/.cargo/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.124/src/lib.rs:93:21
  39:     0x7f2526f10475 - core::ops::function::FnOnce::call_once::hc67121f70d480ef0
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/ops/function.rs:232:5
  40:     0x7f2526f0e9e6 - proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::{{closure}}::h66b048df93c6d00d
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:394:40
  41:     0x7f2526f0e09f - proc_macro::bridge::client::run_client::{{closure}}::{{closure}}::h8ae7bd45fd938bf8
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:362:26
  42:     0x7f2526ee0a97 - proc_macro::bridge::scoped_cell::ScopedCell<T>::set::{{closure}}::h08f95269dcc3b5c4
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/scoped_cell.rs:79:33
  43:     0x7f2526ee0cea - proc_macro::bridge::scoped_cell::ScopedCell<T>::replace::h0a59541af9d4dbd3
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/scoped_cell.rs:74:9
  44:     0x7f2526ee0a71 - proc_macro::bridge::scoped_cell::ScopedCell<T>::set::hd1a6f2289d78c46e
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/scoped_cell.rs:79:9
  45:     0x7f2526f0e88d - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::{{closure}}::hdc3fa2015c7bbd48
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:310:35
  46:     0x7f2526e84e3c - std::thread::local::LocalKey<T>::try_with::h9de3545a66214e38
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:263:16
  47:     0x7f2526e84987 - std::thread::local::LocalKey<T>::with::h6a2cb9567c499e4f
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/thread/local.rs:239:9
  48:     0x7f2526efd83c - proc_macro::bridge::client::<impl proc_macro::bridge::Bridge>::enter::h558d9ca9dac413c4
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:310:9
  49:     0x7f2526f0def2 - proc_macro::bridge::client::run_client::{{closure}}::h79bec6fbed271763
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:355:9
  50:     0x7f2526edcb72 - <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once::hf93c872a8bd81870
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:318:9
  51:     0x7f2526e6b9a2 - std::panicking::try::do_call::h271fbd9d10278100
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:331:40
  52:     0x7f2526e779ed - __rust_try
  53:     0x7f2526e6b8c0 - std::panicking::try::h167bfab55a5eb7eb
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panicking.rs:274:15
  54:     0x7f2526ee4572 - std::panic::catch_unwind::hb708d46ed82255dc
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libstd/panic.rs:394:14
  55:     0x7f2526f0ddbf - proc_macro::bridge::client::run_client::h9b2b555625d8cca0
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:354:5
  56:     0x7f2526f0e99d - proc_macro::bridge::client::Client<fn(proc_macro::TokenStream) .> proc_macro::TokenStream>::expand1::run::hc7db7c44198ab18f
                               at /home/vallentin/.rustup/toolchains/1.44.0-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libproc_macro/bridge/client.rs:394:13
  57:     0x55e41b408475 - proc_macro_srv::proc_macro::bridge::server::run_server::h35dc180528590974
  58:     0x55e41b403902 - proc_macro_srv::dylib::Expander::expand::h24aaa930b521316d
  59:     0x55e41b3ebed6 - proc_macro_srv::ProcMacroSrv::expand::ha29ddbaceaecd05b
  60:     0x55e41b3dee90 - proc_macro_srv::cli::run::h9e8c9c072ccb9a82
  61:     0x55e41b3a83b9 - rust_analyzer::main::he85ee484ee73d91b
  62:     0x55e41b3cf013 - std::sys_common::backtrace::__rust_begin_short_backtrace::h9e7929197aa27d83
  63:     0x55e41b3cf4a9 - std::rt::lang_start::{{closure}}::h7fe8a2e337373efb
  64:     0x55e41c196f67 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h78040f802d89ccdc
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/core/src/ops/function.rs:259:13
  65:     0x55e41c196f67 - std::panicking::try::do_call::h6853cad536dd09a1
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:379:40
  66:     0x55e41c196f67 - std::panicking::try::h827495f03a9fbb9a
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panicking.rs:343:19
  67:     0x55e41c196f67 - std::panic::catch_unwind::h4bdf17571090eb17
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/panic.rs:396:14
  68:     0x55e41c196f67 - std::rt::lang_start_internal::h2f319c33bb013f29
                               at /rustc/cb75ad5db02783e8b0222fee363c5f63f7e2cf5b/library/std/src/rt.rs:51:25
  69:     0x55e41b3aac52 - main
  70:     0x7f252727c0b3 - __libc_start_main
  71:     0x55e41b346659 - _start
  72:                0x0 - <unknown>
thread panicked while panicking. aborting.
[ERROR proc_macro_api::process] proc macro server crashed, server process state: Ok(Some(ExitStatus(ExitStatus(4)))), server request error: Os { code: 32, kind: BrokenPipe, message: "Broken pipe" }

Which rustc version are you using?

@bjorn3

@bjorn3 I was using 1.43.0, and I thought it might have been the issue. However, after I switched to 1.50.0, then the issue still occurred.

proc-macro /home/vallentin/work/playground/y21w12/target/debug/deps/libserde_derive-f53128d657754e5e.so failed to find the given version. Reason: snappy: corrupt input (expected stream header but got unexpected chunk type byte 188)
proc-macro /home/vallentin/work/playground/y21w12/target/debug/deps/libserde_derive-f53128d657754e5e.so failed to find the given version. Reason: snappy: corrupt input (expected stream header but got unexpected chunk type byte 188)

That's unexpected, right?

@vallentin

That's unexpected, right?

Um.. that's strange. maybe some old libc or linker bugs ?

@vallentin What Ubuntu version you are using ?

If possible, could you try to run cargo clean and see if the issue is still there ?

@edwin0cheng

@edwin0cheng

From the welcome message:

Welcome to Ubuntu 20.04.2 LTS (GNU/Linux 5.4.72-microsoft-standard-WSL2 x86_64)

The even weirder thing is that after I commented about the issue, things have actually escalated even worse. I randomly get syntax errors like "expected semicolon". One instance I remember, is where I literally just removed an import, and it complained about missing semicolon. Then I did Ctrl+Z, and the error remained. If I pushed the import lines down, the error would stay at the now empty line.

I also had an instance there an impl Foo complained about Foo not existing, while the struct Foo was literally just above.

Even though rust-analyzer showed all those errors, everything compiles fine with cargo build, and doing "RA Restart Server" and the errors are gone as well. New errors quickly appear.

The above issues started occurring and increasing in frequency during a "VSCode Live Share" session, with me and another coworker while talking about some design stuff.

As an extra comment, it only happens in WSL+Ubuntu, it doesn't happen on my Windows machine. Even when both use Rust 1.51.

I'll try and do cargo clean on Monday, and report back whether the issues stop.

This might not be related to the issue directly, but I was having the same proc macro server crashed problem and I managed to fix it by setting the right default toolchain.
Since I'm quite new to using rust I was unaware that there can be multiple versions of rust on the same machine, and so I was running an older version of rustc even though I updated all my packages and ran rustup update.
I fixed it by running rustup show to see all the installed toolchains and selecting the newest with:
rustup default stable-x86_64-unknown-linux-gnu
I ran cargo clean just to be safe and now everything works again.

Oh, I just saw this in a project that uses a rust-toolchain override to 1.46.

Also seeing this in a project that uses has rust-toolchain 1.46 and on a serde derive macro on an Arch Linux install even after a cargo clean, so I think it's a platform agnostic issue. I'm unable to reproduce the issue on projects without the rust-toolchain file.

So it looks like the metadata format changed at some point without actually changing the version (see #6822 for more details).

In that case, is the only workaround to right now is to disable proc-macro expansion and wait for a future update?

IIRC, the format changed around 4 months ago, so I think after 1.50 should be fine.

The other workaround is to temporarily remove the rust-toolchain file.

Is there anything left to do here? I think we've addressed the original issue about printing proc macros as far as possible, and we don't support older rustc versions.

For what it's worth, I can add that since the 2 months ago, where I commented a somewhat related issue. I did cargo clean back then and haven't experienced the issue since.

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proc macro server crashes for certain macros #8148

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proc macro server crashes for certain macros #8148

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lnicola commented on Mar 22, 2021

lnicola commented on Mar 22, 2021

lenscas commented on Mar 22, 2021

edwin0cheng commented on Mar 23, 2021

vallentin commented on Mar 23, 2021

edwin0cheng commented on Mar 23, 2021

vallentin commented on Mar 24, 2021

bjorn3 commented on Mar 24, 2021

vallentin commented on Mar 24, 2021

lnicola commented on Mar 27, 2021

edwin0cheng commented on Mar 27, 2021

vallentin commented on Mar 27, 2021

itsxaos commented on Mar 30, 2021

lnicola commented on Apr 8, 2021

edward-shen commented on Apr 9, 2021

lnicola commented on Apr 9, 2021

edward-shen commented on Apr 9, 2021

edwin0cheng commented on Apr 9, 2021

lnicola commented on Apr 9, 2021

flodiebold commented on May 21, 2021

vallentin commented on May 21, 2021

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