[Merged by Bors] - fix some memory leaks detected by miri #4959
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Can we get that command added to somewhere in the docs? |
alice-i-cecile
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Jun 27, 2022
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Jun 27, 2022
remove `-Zmiri-ignore-leaks` from CI args and fix leaks that miri detects.
The first leak:
```rust
#[test]
fn blob_vec_drop_empty_capacity() {
let item_layout = Layout::new::<Foo>();
let drop = drop_ptr::<Foo>;
let _ = unsafe { BlobVec::new(item_layout, Some(drop), 0) };
}
```
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
```rust
#[test]
fn panic_while_overwriting_component() {
let helper = DropTestHelper::new();
let res = panic::catch_unwind(|| {
let mut world = World::new();
world
.spawn()
.insert(helper.make_component(true, 0))
.insert(helper.make_component(false, 1));
println!("Done inserting! Dropping world...");
});
let drop_log = helper.finish(res);
assert_eq!(
&*drop_log,
[
DropLogItem::Create(0),
DropLogItem::Create(1),
DropLogItem::Drop(0),
]
);
}
```
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
---
managed to figure out where the leaks were by using this 10/10 command
```
cargo --quiet test --lib -- --list | sed 's/: test$//' | MIRIFLAGS="-Zmiri-disable-isolation" xargs -n1 cargo miri test --lib -- --exact
```
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak :upside_down_face:
alice-i-cecile
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Build failed: |
Looks like there's a warning that should be ignored? |
|
bors retry |
bors bot
pushed a commit
that referenced
this pull request
Jun 30, 2022
remove `-Zmiri-ignore-leaks` from CI args and fix leaks that miri detects.
The first leak:
```rust
#[test]
fn blob_vec_drop_empty_capacity() {
let item_layout = Layout::new::<Foo>();
let drop = drop_ptr::<Foo>;
let _ = unsafe { BlobVec::new(item_layout, Some(drop), 0) };
}
```
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
```rust
#[test]
fn panic_while_overwriting_component() {
let helper = DropTestHelper::new();
let res = panic::catch_unwind(|| {
let mut world = World::new();
world
.spawn()
.insert(helper.make_component(true, 0))
.insert(helper.make_component(false, 1));
println!("Done inserting! Dropping world...");
});
let drop_log = helper.finish(res);
assert_eq!(
&*drop_log,
[
DropLogItem::Create(0),
DropLogItem::Create(1),
DropLogItem::Drop(0),
]
);
}
```
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
---
managed to figure out where the leaks were by using this 10/10 command
```
cargo --quiet test --lib -- --list | sed 's/: test$//' | MIRIFLAGS="-Zmiri-disable-isolation" xargs -n1 cargo miri test --lib -- --exact
```
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak :upside_down_face:
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Build failed: |
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BoxyUwU
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-Zmiri-ignore-leaks from miri CI job
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bors r+ |
bors bot
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Jul 1, 2022
The first leak:
```rust
#[test]
fn blob_vec_drop_empty_capacity() {
let item_layout = Layout::new::<Foo>();
let drop = drop_ptr::<Foo>;
let _ = unsafe { BlobVec::new(item_layout, Some(drop), 0) };
}
```
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
```rust
#[test]
fn panic_while_overwriting_component() {
let helper = DropTestHelper::new();
let res = panic::catch_unwind(|| {
let mut world = World::new();
world
.spawn()
.insert(helper.make_component(true, 0))
.insert(helper.make_component(false, 1));
println!("Done inserting! Dropping world...");
});
let drop_log = helper.finish(res);
assert_eq!(
&*drop_log,
[
DropLogItem::Create(0),
DropLogItem::Create(1),
DropLogItem::Drop(0),
]
);
}
```
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
---
managed to figure out where the leaks were by using this 10/10 command
```
cargo --quiet test --lib -- --list | sed 's/: test$//' | MIRIFLAGS="-Zmiri-disable-isolation" xargs -n1 cargo miri test --lib -- --exact
```
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak :upside_down_face:
bors
bot
changed the title
bors bot
pushed a commit
that referenced
this pull request
Jul 6, 2022
# Objective When `miri` runs in our build system to detect unsoundness, its output can be very unhelpful, as the tests are all run in parallel. ## Solution Add a comment documenting the extremely obvious 10/10 command used by @BoxyUwU in #4959. I've stuck this in the CI file, as it seems like the most obvious place to check when frustrated. I didn't put it in CONTRIBUTING.md because this is an eldritch abomination and will never be useful to new contributors.
inodentry
pushed a commit
to IyesGames/bevy
that referenced
this pull request
Aug 8, 2022
The first leak:
```rust
#[test]
fn blob_vec_drop_empty_capacity() {
let item_layout = Layout::new::<Foo>();
let drop = drop_ptr::<Foo>;
let _ = unsafe { BlobVec::new(item_layout, Some(drop), 0) };
}
```
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
```rust
#[test]
fn panic_while_overwriting_component() {
let helper = DropTestHelper::new();
let res = panic::catch_unwind(|| {
let mut world = World::new();
world
.spawn()
.insert(helper.make_component(true, 0))
.insert(helper.make_component(false, 1));
println!("Done inserting! Dropping world...");
});
let drop_log = helper.finish(res);
assert_eq!(
&*drop_log,
[
DropLogItem::Create(0),
DropLogItem::Create(1),
DropLogItem::Drop(0),
]
);
}
```
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
---
managed to figure out where the leaks were by using this 10/10 command
```
cargo --quiet test --lib -- --list | sed 's/: test$//' | MIRIFLAGS="-Zmiri-disable-isolation" xargs -n1 cargo miri test --lib -- --exact
```
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak :upside_down_face:
inodentry
pushed a commit
to IyesGames/bevy
that referenced
this pull request
Aug 8, 2022
# Objective When `miri` runs in our build system to detect unsoundness, its output can be very unhelpful, as the tests are all run in parallel. ## Solution Add a comment documenting the extremely obvious 10/10 command used by @BoxyUwU in bevyengine#4959. I've stuck this in the CI file, as it seems like the most obvious place to check when frustrated. I didn't put it in CONTRIBUTING.md because this is an eldritch abomination and will never be useful to new contributors.
james7132
pushed a commit
to james7132/bevy
that referenced
this pull request
Oct 28, 2022
The first leak:
```rust
#[test]
fn blob_vec_drop_empty_capacity() {
let item_layout = Layout::new::<Foo>();
let drop = drop_ptr::<Foo>;
let _ = unsafe { BlobVec::new(item_layout, Some(drop), 0) };
}
```
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
```rust
#[test]
fn panic_while_overwriting_component() {
let helper = DropTestHelper::new();
let res = panic::catch_unwind(|| {
let mut world = World::new();
world
.spawn()
.insert(helper.make_component(true, 0))
.insert(helper.make_component(false, 1));
println!("Done inserting! Dropping world...");
});
let drop_log = helper.finish(res);
assert_eq!(
&*drop_log,
[
DropLogItem::Create(0),
DropLogItem::Create(1),
DropLogItem::Drop(0),
]
);
}
```
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
---
managed to figure out where the leaks were by using this 10/10 command
```
cargo --quiet test --lib -- --list | sed 's/: test$//' | MIRIFLAGS="-Zmiri-disable-isolation" xargs -n1 cargo miri test --lib -- --exact
```
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak :upside_down_face:
james7132
pushed a commit
to james7132/bevy
that referenced
this pull request
Oct 28, 2022
# Objective When `miri` runs in our build system to detect unsoundness, its output can be very unhelpful, as the tests are all run in parallel. ## Solution Add a comment documenting the extremely obvious 10/10 command used by @BoxyUwU in bevyengine#4959. I've stuck this in the CI file, as it seems like the most obvious place to check when frustrated. I didn't put it in CONTRIBUTING.md because this is an eldritch abomination and will never be useful to new contributors.
ItsDoot
pushed a commit
to ItsDoot/bevy
that referenced
this pull request
Feb 1, 2023
The first leak:
```rust
#[test]
fn blob_vec_drop_empty_capacity() {
let item_layout = Layout::new::<Foo>();
let drop = drop_ptr::<Foo>;
let _ = unsafe { BlobVec::new(item_layout, Some(drop), 0) };
}
```
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
```rust
#[test]
fn panic_while_overwriting_component() {
let helper = DropTestHelper::new();
let res = panic::catch_unwind(|| {
let mut world = World::new();
world
.spawn()
.insert(helper.make_component(true, 0))
.insert(helper.make_component(false, 1));
println!("Done inserting! Dropping world...");
});
let drop_log = helper.finish(res);
assert_eq!(
&*drop_log,
[
DropLogItem::Create(0),
DropLogItem::Create(1),
DropLogItem::Drop(0),
]
);
}
```
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
---
managed to figure out where the leaks were by using this 10/10 command
```
cargo --quiet test --lib -- --list | sed 's/: test$//' | MIRIFLAGS="-Zmiri-disable-isolation" xargs -n1 cargo miri test --lib -- --exact
```
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak :upside_down_face:
ItsDoot
pushed a commit
to ItsDoot/bevy
that referenced
this pull request
Feb 1, 2023
# Objective When `miri` runs in our build system to detect unsoundness, its output can be very unhelpful, as the tests are all run in parallel. ## Solution Add a comment documenting the extremely obvious 10/10 command used by @BoxyUwU in bevyengine#4959. I've stuck this in the CI file, as it seems like the most obvious place to check when frustrated. I didn't put it in CONTRIBUTING.md because this is an eldritch abomination and will never be useful to new contributors.
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The first leak:
this is because we allocate the swap scratch in blobvec regardless of what the capacity is, but we only deallocate if capacity is > 0
The second leak:
this is caused by us not running the drop impl on the to-be-inserted component if the drop impl of the overwritten component panics
managed to figure out where the leaks were by using this 10/10 command
which runs every test one by one rather than all at once which let miri actually tell me which test had the leak 🙃