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wasmtime 17 hangs while trying to load wasm file #7874

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glebpom opened this issue Feb 5, 2024 · 5 comments · Fixed by #7882
Closed

wasmtime 17 hangs while trying to load wasm file #7874

glebpom opened this issue Feb 5, 2024 · 5 comments · Fixed by #7882
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bug Incorrect behavior in the current implementation that needs fixing cranelift:E-compiler Compiler issues.

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@glebpom
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glebpom commented Feb 5, 2024

Test Case

https://drive.google.com/file/d/1HYlz78KTuag9bTpNwGP_blp5yWo95i_7/view?usp=sharing

This wasm file successfully loads by version 16, but wasmtime 17 hangs and eats a lot of CPU while trying to load it

Steps to Reproduce

This is reproducible in python and ruby. Example ruby code:

      @engine = Wasmtime::Engine.new
      @mod = Wasmtime::Module.new(@engine, wasm)

Expected Results

Should work

Actual Results

It hangs eating ~170% of CPU

Versions and Environment

Wasmtime version or commit: 17

Operating system: MacOS

Architecture: aarch64
@glebpom glebpom added the bug Incorrect behavior in the current implementation that needs fixing label Feb 5, 2024
@pchickey
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pchickey commented Feb 5, 2024

It appears this is some sort of codegen bug - I was able to reproduce this on main with cargo run --release -- compile v0.2.0.wasm, wasmtime consumes 2 cores for as long as I had the patience for (~4 mins)

@pchickey pchickey added the cranelift:E-compiler Compiler issues. label Feb 5, 2024
@glebpom
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glebpom commented Feb 6, 2024 •
edited

I was able to bisect and find the breaking commit, which is:

fac3b9c2d1373c8bdf10b53f2f6e96c01c90afd8 is the first bad commit
commit fac3b9c2d1373c8bdf10b53f2f6e96c01c90afd8
Author: Alex Crichton <alex@alexcrichton.com>
Date:   Thu Jan 25 09:50:19 2024 -0800

    Enable the component model by default

    This commit enables the component model by default in the embedding API
    and the CLI. This means that an opt-in of `-W component-model` is no
    longer required and additionally `.wasm_component_model(true)` is no
    longer required. Note that this won't impact existing embeddings since
    the component model feature doesn't do much less `wasmtime::component`
    is used, and if that's being used this is probably good news for you.

 crates/wasmtime/src/config.rs |  1 +
 src/common.rs                 |  2 +-
 tests/all/cli_tests.rs        | 23 +++++++++++++++++++++++
 3 files changed, 25 insertions(+), 1 deletion(-)

EDIT: I was bisecting this PR https://github.com/bytecodealliance/wasmtime/pull/7800/commits

@alexcrichton
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@glebpom can you clarify how you bisected? My bisection points to #7719 and looking at a performance profile most of the time is spent in constructor_will_simplify_with_ireduce which helps point to that PR as well.

@alexcrichton alexcrichton mentioned this issue Feb 6, 2024
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@glebpom
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glebpom commented Feb 6, 2024

@alexcrichton yes, you are right. I can't reproduce this anymore, but the commit you pointed to clearly makes it hang.

elliottt added a commit to elliottt/wasmtime that referenced this issue Feb 7, 2024
@elliottt @fitzgen
Guard recursion in will_simplify_with_ireduce
c293ba1 
Add a test to expose issues with unbounded recursion through `iadd`
during egraph rewrites, and bound the recursion of
`will_simplify_with_ireduce`.

Fixes bytecodealliance#7874

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
@elliottt elliottt mentioned this issue Feb 7, 2024
Merged
github-merge-queue bot pushed a commit that referenced this issue Feb 7, 2024
@elliottt @fitzgen
Guard recursion in will_simplify_with_ireduce (#7882)
74a303a 
Add a test to expose issues with unbounded recursion through `iadd`
during egraph rewrites, and bound the recursion of
`will_simplify_with_ireduce`.

Fixes #7874

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
elliottt added a commit to elliottt/wasmtime that referenced this issue Feb 7, 2024
@elliottt @fitzgen
Guard recursion in will_simplify_with_ireduce (bytecodealliance#7882)
45c8a5c 
Add a test to expose issues with unbounded recursion through `iadd`
during egraph rewrites, and bound the recursion of
`will_simplify_with_ireduce`.

Fixes bytecodealliance#7874

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
@elliottt elliottt mentioned this issue Feb 7, 2024
Open
elliottt added a commit that referenced this issue Feb 7, 2024
@elliottt @fitzgen
Guard recursion in will_simplify_with_ireduce (#7882) (#7885)
f3e15d5 
Add a test to expose issues with unbounded recursion through `iadd`
during egraph rewrites, and bound the recursion of
`will_simplify_with_ireduce`.

Fixes #7874

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
elliottt added a commit to elliottt/wasmtime that referenced this issue Feb 7, 2024
@elliottt @fitzgen
Guard recursion in will_simplify_with_ireduce (bytecodealliance#7882)
93c7563 
Add a test to expose issues with unbounded recursion through `iadd`
during egraph rewrites, and bound the recursion of
`will_simplify_with_ireduce`.

Fixes bytecodealliance#7874

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
elliottt added a commit that referenced this issue Feb 7, 2024
@elliottt @fitzgen
Backport egraph fixes to 17.0.1 (#7889)
fff54cb 
* Guard recursion in `will_simplify_with_ireduce` (#7882)

Add a test to expose issues with unbounded recursion through `iadd`
during egraph rewrites, and bound the recursion of
`will_simplify_with_ireduce`.

Fixes #7874

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>

* Cranelift: Use a fixpoint loop to compute the best value for each eclass (#7859)

* Cranelift: Use a fixpoint loop to compute the best value for each eclass

Fixes #7857

* Remove fixpoint loop early-continue optimization

* Add document describing optimization rule invariants

* Make select optimizations use subsume

* Remove invalid debug assert

* Remove now-unused methods

* Add commutative adds to cost tests

* Add missing subsume uses in egraph rules (#7879)

* Fix a few egraph rules that needed `subsume`

There were a few rules that dropped value references from the LHS
without using subsume. I think they were probably benign as they
produced constant results, but this change is in the spirit of our
revised guidelines for egraph rules.

* Augment egraph rule guideline 2 to talk about constants

* Update release notes

---------

Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com>
@elliottt
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elliottt commented Feb 7, 2024

This should be fixed in the wasmtime 17.0.1 release, thank you again for reporting this!

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Guard recursion in will_simplify_with_ireduce elliottt/wasmtime
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@elliottt @glebpom @alexcrichton @pchickey