LLVM error: "Instruction does not dominate all uses!" on Windows #72470

kryptan · 2020-05-22T16:24:44Z

Code

Project is here: https://github.com/kryptan/llvm-error

Compile with cargo test --release on Windows-MSVC (compilation on Linux works fine).

src/lib.rs:

use std::future::Future;
use std::sync::Arc;

pub async fn run() {
    foo(|| async { create() }).await;
    foo(|| async { create() }).await;
}

async fn foo<F>(create: impl Fn() -> F)
where
    F: Future<Output = Struct>,
{
    call_empty::<()>(create().await, "").await;
}

struct Struct {
    _vec: Vec<u8>,
    _arc: Arc<()>,
}

fn create() -> Struct {
    Struct {
        _vec: Vec::new(),
        _arc: Arc::new(()),
    }
}

async fn call_empty<R>(_: Struct, _: &str) {
    empty()
}

fn empty() {}

tests/test.rs:

use std::future::Future;

#[test]
fn test() {
    let _: Box<dyn Future<Output = ()>> = Box::new(llvm_eror::run());
}

Error output

Instruction does not dominate all uses!
  %117 = phi i8* [ %117, %111 ], [ %117, %105 ], [ %43, %60 ], [ %43, %58 ], [ %51, %56 ]
  %117 = phi i8* [ %117, %111 ], [ %117, %105 ], [ %43, %60 ], [ %43, %58 ], [ %51, %56 ]
Instruction does not dominate all uses!
  %117 = phi i8* [ %117, %111 ], [ %117, %105 ], [ %43, %60 ], [ %43, %58 ], [ %51, %56 ]
  %117 = phi i8* [ %117, %111 ], [ %117, %105 ], [ %43, %60 ], [ %43, %58 ], [ %51, %56 ]
Instruction does not dominate all uses!
  %228 = phi i8* [ %228, %222 ], [ %228, %216 ], [ %155, %171 ], [ %155, %169 ], [ %162, %167 ]
  %228 = phi i8* [ %228, %222 ], [ %228, %216 ], [ %155, %171 ], [ %155, %169 ], [ %162, %167 ]
Instruction does not dominate all uses!
  %228 = phi i8* [ %228, %222 ], [ %228, %216 ], [ %155, %171 ], [ %155, %169 ], [ %162, %167 ]
  %228 = phi i8* [ %228, %222 ], [ %228, %216 ], [ %155, %171 ], [ %155, %169 ], [ %162, %167 ]
in function _ZN97_$LT$core..future..from_generator..GenFuture$LT$T$GT$$u20$as$u20$core..future..future..Future$GT$4poll17hf4840ccb0415d3e1E
LLVM ERROR: Broken function found, compilation aborted!
error: could not compile `llvm_eror`.

The text was updated successfully, but these errors were encountered:

jonas-schievink · 2020-05-22T17:13:58Z

Regression from rustc 1.45.0-nightly (bad3bf6 2020-05-09) to rustc 1.45.0-nightly (9912925 2020-05-10)

bad3bf6...9912925

Further bisection might be needed

jonas-schievink · 2020-05-22T17:15:23Z

A smaller reproduction would be useful (if that's possible), marking needs-mcve

jonas-schievink · 2020-05-23T22:21:05Z

@rustbot ping cleanup

rustbot · 2020-05-23T22:21:07Z

Hey Cleanup Crew ICE-breakers! This bug has been identified as a good
"Cleanup ICE-breaking candidate". In case it's useful, here are some
instructions for tackling these sorts of bugs. Maybe take a look?
Thanks! <3

cc @AminArria @chrissimpkins @contrun @DutchGhost @elshize @ethanboxx @h-michael @HallerPatrick @hdhoang @hellow554 @imtsuki @jakevossen5 @kanru @KarlK90 @LeSeulArtichaut @MAdrianMattocks @matheus-consoli @mental32 @nmccarty @Noah-Kennedy @pard68 @PeytonT @pierreN @Redblueflame @RobbieClarken @RobertoSnap @robjtede @SarthakSingh31 @senden9 @shekohex @sinato @spastorino @turboladen @woshilapin @yerke

JohnTitor · 2020-05-25T18:07:16Z

With some bisection, I think this caused by #71840, cc @matthewjasper

LeSeulArtichaut · 2020-05-26T12:56:12Z

Assigning P-critical, and pinging the LLVM ICE-breaker group as discussed as part of the Prioritization WG process.

@rustbot ping llvm

rustbot · 2020-05-26T12:56:14Z

Hey LLVM ICE-breakers! This bug has been identified as a good
"LLVM ICE-breaking candidate". In case it's useful, here are some
instructions for tackling these sorts of bugs. Maybe take a look?
Thanks! <3

cc @comex @CrazyDebugger @cuviper @DutchGhost @hanna-kruppe @hdhoang @heyrutvik @JOE1994 @jryans @mmilenko @nagisa @nikic @Noah-Kennedy @SiavoshZarrasvand @spastorino @vertexclique

pnkfelix · 2020-05-28T14:15:49Z

self-assigning, with plan to revert injecting PR before it hits beta.

matthewjasper · 2020-05-28T16:43:26Z

So, investigating this bug some more:

Merging everything into 1 crate doesn't give a broken IR error
-C codegen-units=1 doesn't give a broken IR error
--emit llvm-ir -C no-prepopulate-passes causes an assertion in llvm (if enabled), but works on nightly. llc then happily compiles to asm.

So reverting is the only thing that I can think of to fix this.

nagisa · 2020-06-06T12:37:10Z

So reverting is the only thing that I can think of to fix this.

Is the only quick fix, I guess.

Ultimately this extremely likely to be an issue in LLVM itself – you cannot really construct a IR malformed in a way that would raise this error in lowering to LLVM-IR (I believe almost by construction of the LLVM API), especially because we do not generate phis.

I think the PR in question is worthwhile enough to warrant spending time looking into it, so I would love to see an issue filled with links to all the information we currently have so that it does not get lost as this one is closed by the PR above.

pnkfelix · 2020-07-27T17:05:33Z

Thanks @xtutu ! I was able to replicate the LLVM assertion now with that Cargo.lock in place! (And of course, I had to remember to do cargo build --release instead of a debug build. 😉 )

pnkfelix · 2020-07-28T19:44:32Z

I've narrowed the rust-template crate itself down to this pair of files: a main.rs and a Cargo.toml that specifies the precise version of tokio one needs to use to replicate the problem:

// src/main.rs
use tokio;
use std::error::Error;
use std::sync::Mutex;

#[allow(dead_code)]
enum Msg {
    A(Vec<()>),
    B,
}

#[allow(unused_must_use)]
#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let (_, mut rx) = tokio::sync::mpsc::unbounded_channel::<Msg>();
    let entity = Box::new(Mutex::new(()));

    tokio::spawn(async move {
        tokio::select! {
            Some(msg) = rx.recv() => {
                entity.lock();
                drop(msg);
            }
        }
        entity.lock();
    });

    return Ok(());
}

# Cargo.toml
[package]
name = "rust-template"
version = "0.1.0"
authors = ["linyongxing <xtutu0202@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

default-run = "rust-template"

[dependencies]
tokio = { version = "=0.2.21", features = ["rt-core", "macros", "sync"] }

With these two files in a fresh crate, I get this from a release build (still on Windows, keep in mind, with stable rustc 1.44.1 c7087fe):

> cargo build --release
    Updating crates.io index
   Compiling proc-macro2 v1.0.19
   Compiling unicode-xid v0.2.1
   Compiling syn v1.0.36
   Compiling bytes v0.5.6
   Compiling fnv v1.0.7
   Compiling pin-project-lite v0.1.7
   Compiling quote v1.0.7
   Compiling tokio-macros v0.2.5
   Compiling tokio v0.2.21
   Compiling rust-template v0.1.0 (C:\Users\pfxbo\temp-rust-debug\rust-template)
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
Instruction does not dominate all uses!
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
  %182 = phi i8* [ %92, %91 ], [ %55, %190 ], [ %182, %89 ], [ %182, %85 ], [ %182, %187 ], [ %182, %112 ], [ %182, %108 ], [ %182, %105 ], [ %182, %101 ]
in function _ZN97_$LT$core..future..from_generator..GenFuture$LT$T$GT$$u20$as$u20$core..future..future..Future$GT$4poll17h257417a290b49d85E
LLVM ERROR: Broken function found, compilation aborted!
error: could not compile `rust-template`.

To learn more, run the command again with --verbose.

yoshuawuyts · 2020-07-31T10:55:58Z

We've been running into this error using Windows MSVC on our work codebase. I've been able to pin down the regression to the Rust 1.44.0 which was part of #69033. We've not observed this error occurring on Linux, MacOS, FreeBSD, or Windows-GNU.

cc/ @jonas-schievink

Error

Instruction does not dominate all uses!
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
Instruction does not dominate all uses!
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
Instruction does not dominate all uses!
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
Instruction does not dominate all uses!
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
Instruction does not dominate all uses!
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %132197 ], [ %13219, %12944 ]
Instruction does not dominate all uses!
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
  %13219 = phi i8* [ %13219, %13235 ], [ %13219, %13233 ], [ %13219, %13230 ], [ %13219, %13227 ], [ %13219, %13224 ], [ %13219, %13221 ], [ %13219, %12592 ], [ %13219, %12707 ], [ %12837, %12834 ], [ %12831, %12827 ], [ %13219, %12944 ]
in function _ZN8tiberius3tds6stream5token20TokenStream$LT$S$GT$10try_unfold28_$u7b$$u7b$closure$u7d$$u7d$28_$u7b$$u7b$closure$u7d$$u7d$17hbf00841fdd51402aE.llvm.12308354007712700541
LLVM ERROR: Broken function found, compilation aborted!
error: could not compile `quaint`.

After this error the usual error of Instruction does not dominate all uses! in GenFuture follows. Instruction does not dominate all uses! is printed multiple times in our codebase.

Tested versions

I've tested a range of versions on several Windows machines. I reliably got the following results:

version	result
1.42.0 MSVC	Ok
1.43.0 MSVC	Ok
1.44.0 MSVC	Error
1.44.1 MSVC	Error
1.45.0 MSVC	Error
1.45.1 MSVC	Error

Repro

The main codebase at work is a rather large one and takes a while to compile. I haven't been able to pin this down to a specific dependency or file that triggers this error yet. Luckily our codebase is open source, which allows people to clone and build it. To do so do:

$ git clone git@github.com:prisma/prisma-engines.git
$ cd prisma-engines
$ cargo build --release

I don't believe we have any peer dependencies aside from a Rust MSVC toolchain to compile on Windows.

jonas-schievink · 2020-07-31T15:10:25Z

prisma-engines has multiple C dependencies (libsqlite, zlib, libgit2), which means that cross-compiling it rather painful (from Linux to Windows, that is). I did further reduce the code posted by @pnkfelix above though, removing tokio's proc. macros in the process: https://github.com/jonas-schievink/llvm-error

I'll try to reduce that down further.

jonas-schievink · 2020-07-31T22:46:04Z

I have now pushed a 2-file repro. I'll leave the rest to our LLVM experts.

yoshuawuyts · 2020-08-04T11:22:56Z

I've filed two test cases on the repro:

switch the channel impl: https://github.com/jonas-schievink/llvm-error/pull/1
switch the block_on impl: https://github.com/jonas-schievink/llvm-error/pull/2

It seems that switching the channel impl makes the error disappear. Whereas switching the block_on impl keeps it. According to @jonas-schievink in https://github.com/jonas-schievink/llvm-error/pull/1#issuecomment-668535630 the channel code is quite fragile, and changing any part of it makes the error disappear.

Aaron1011 · 2020-09-25T16:15:14Z

Does this still reproduce with the latest nightly (LLVM 11)?

jonas-schievink · 2020-09-25T16:51:27Z

On rustc 1.48.0-nightly (8b4085359 2020-09-23) I can't reproduce this

Aaron1011 · 2020-10-02T19:24:03Z

A bisect shows that this was fixed by the upgrade to LLVM 11 in #73526. I'm going to try-relanding the original PR.

This was fixed with the upgrade to LLVM 11 in rust-lang#73526. It seems extremely unlikey that this exact issue will ever reoccur, since slight modifications to the code caused the crash to stop happening. However, it can't hurt to have a test for it.

…jasper Re-land PR rust-lang#71840 (Rework MIR drop tree lowering) PR rust-lang#71840 was reverted in rust-lang#72989 to fix an LLVM error (rust-lang#72470). That LLVM error no longer occurs with the recent upgrade to LLVM 11 (rust-lang#73526), so let's try re-landing this PR. I've cherry-picked the commits from the original PR (with the exception of the commit blessing test output), making as few modifications as possible. I addressed the rebase fallout in separate commits on top of those. r? `@matthewjasper`

tmandry · 2020-10-06T17:33:35Z

Fixed by #77466.

The hope is that the random LLVM failures will stop, rust-lang/rust#72470 being fixed.

* remove apply migration * remove listmigrations * remove calculatedatabasesteps * remove calculateDatamodel * remove inferMigrationSteps * remove migrationProgress * remove unapplyMigrations * remove initialize * start removing old migration persistence * start removing migrationsteps serialization * remove steps serialization * remove partialeq * Ignore postgis tables when checking for initialized schemas * Fix sqlite test * Update windows CI toolchain to 1.48.0 The hope is that the random LLVM failures will stop, rust-lang/rust#72470 being fixed. Co-authored-by: Tom Houlé <tom@tomhoule.com>

kryptan added C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 22, 2020

jonas-schievink added regression-from-stable-to-nightly Performance or correctness regression from stable to nightly. E-needs-mcve Call for participation: This issue has a repro, but needs a Minimal Complete and Verifiable Example labels May 22, 2020

rustbot added the ICEBreaker-Cleanup-Crew Helping to "clean up" bugs with minimal examples and bisections label May 23, 2020

jonas-schievink removed the E-needs-bisection Call for participation: This issue needs bisection: https://github.com/rust-lang/cargo-bisect-rustc label May 25, 2020

LeSeulArtichaut added P-critical Critical priority and removed I-prioritize Issue: Indicates that prioritization has been requested for this issue. labels May 26, 2020

rustbot added the ICEBreaker-LLVM Bugs identified for the LLVM ICE-breaker group label May 26, 2020

tmandry added the AsyncAwait-Triaged Async-await issues that have been triaged during a working group meeting. label May 26, 2020

pnkfelix self-assigned this May 28, 2020

pnkfelix mentioned this issue Jun 4, 2020

Revert pr 71840 #72989

Merged

jonas-schievink self-assigned this Jul 31, 2020

jonas-schievink removed their assignment Jul 31, 2020

tyrken mentioned this issue Sep 3, 2020

Bump Rust toolchain to 1.45 vectordotdev/vector#3515

Closed

Aaron1011 mentioned this issue Oct 2, 2020

Re-land PR #71840 (Rework MIR drop tree lowering) #77466

Merged

tmandry closed this as completed Oct 6, 2020

tomhoule added a commit to prisma/prisma-engines that referenced this issue Dec 23, 2020

Update windows CI toolchain to 1.48.0

6a44439

The hope is that the random LLVM failures will stop, rust-lang/rust#72470 being fixed.

tomhoule mentioned this issue Dec 23, 2020

Update windows CI toolchain to 1.48.0 prisma/prisma-engines#1485

Merged

tmandry moved this to Done in wg-async work Dec 8, 2022

tmandry added this to wg-async work Dec 8, 2022

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LLVM error: "Instruction does not dominate all uses!" on Windows #72470

LLVM error: "Instruction does not dominate all uses!" on Windows #72470

kryptan commented May 22, 2020

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pnkfelix commented Jul 28, 2020 •

edited

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tmandry commented Oct 6, 2020

LLVM error: "Instruction does not dominate all uses!" on Windows #72470

LLVM error: "Instruction does not dominate all uses!" on Windows #72470

Comments

kryptan commented May 22, 2020

Code

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Error output

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pnkfelix commented Jul 28, 2020 • edited Loading

yoshuawuyts commented Jul 31, 2020

Error

Tested versions

Repro

jonas-schievink commented Jul 31, 2020

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