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Always spawn a main2 thread to normalize main stack size issues (#10479) 

Also removes UV_STACK_SIZE and uses RUST_MIN_STACK instead, tweaking
docs to reflect the differences.

Fixes #10367
This commit is contained in:
Aria Desires 2025-01-14 22:35:17 -05:00 committed by GitHub
parent a7fe84aa03
commit 80ac8db7db
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8 changed files with 54 additions and 113 deletions
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33
.github/workflows/ci.yml vendored
View File

@ -305,9 +305,6 @@ jobs:
- name: "Smoke test"
working-directory: ${{ env.UV_WORKSPACE }}
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
run: |
Set-Alias -Name uv -Value ./target/debug/uv
uv venv -v
@ -316,9 +313,6 @@ jobs:
- name: "Smoke test completion"
working-directory: ${{ env.UV_WORKSPACE }}
shell: powershell
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
run: |
Set-Alias -Name uv -Value ./target/debug/uv
Set-Alias -Name uvx -Value ./target/debug/uvx
@ -744,9 +738,6 @@ jobs:
needs: build-binary-windows
name: "integration test | free-threaded on windows"
runs-on: windows-latest
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
steps:
- name: "Download binary"
@ -908,9 +899,6 @@ jobs:
& .venv\Scripts\python.exe --version
- name: "Check install"
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
run: |
.\uv.exe pip install anyio
@ -1040,9 +1028,6 @@ jobs:
& .venv\Scripts\python.exe --version
- name: "Check install"
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
run: |
.\uv.exe pip install anyio
@ -1534,9 +1519,6 @@ jobs:
needs: build-binary-windows
name: "check system | python3.10 on windows"
runs-on: windows-latest
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
steps:
- uses: actions/checkout@v4
@ -1560,9 +1542,6 @@ jobs:
needs: build-binary-windows
name: "check system | python3.10 on windows x86"
runs-on: windows-latest
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
steps:
- uses: actions/checkout@v4
@ -1587,9 +1566,6 @@ jobs:
needs: build-binary-windows
name: "check system | python3.13 on windows"
runs-on: windows-latest
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
steps:
- uses: actions/checkout@v4
@ -1615,9 +1591,6 @@ jobs:
needs: build-binary-windows
name: "check system | python3.12 via chocolatey"
runs-on: windows-latest
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
steps:
- uses: actions/checkout@v4
@ -1750,9 +1723,6 @@ jobs:
- name: "Validate global Python install"
shell: bash -el {0}
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
run: python ./scripts/check_system_python.py --uv ./uv
system-test-amazonlinux:
@ -1789,9 +1759,6 @@ jobs:
needs: build-binary-windows
name: "check system | embedded python3.10 on windows"
runs-on: windows-latest
env:
# Avoid debug build stack overflows.
UV_STACK_SIZE: 3000000 # 3 megabyte, triple the default on windows
steps:
- uses: actions/checkout@v4

12
CONTRIBUTING.md
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@ -82,18 +82,6 @@ cargo run -- venv
cargo run -- pip install requests
```
### Testing on Windows
When testing debug builds on Windows, the stack can overflow resulting in a `STATUS_STACK_OVERFLOW`
error code. This is due to a small stack size limit on Windows that we encounter when running
unoptimized builds — the release builds do not have this problem. We
[added a `UV_STACK_SIZE` variable](https://github.com/astral-sh/uv/pull/941) to bypass this problem
during testing. We recommend bumping the stack size from the default of 1MB to 3MB, for example:
```powershell
$Env:UV_STACK_SIZE = '3000000'
```
## Running inside a Docker container
Source distributions can run arbitrary code on build and can make unwanted modifications to your

12
crates/uv-static/src/env_vars.rs
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@ -249,9 +249,6 @@ impl EnvVars {
/// Use to disable line wrapping for diagnostics.
pub const UV_NO_WRAP: &'static str = "UV_NO_WRAP";
/// Use to increase the stack size used by uv in debug builds on Windows.
pub const UV_STACK_SIZE: &'static str = "UV_STACK_SIZE";
/// Generates the environment variable key for the HTTP Basic authentication username.
#[attr_env_var_pattern("UV_INDEX_{name}_USERNAME")]
pub fn index_username(name: &str) -> String {
@ -505,6 +502,15 @@ impl EnvVars {
/// for more.
pub const RUST_LOG: &'static str = "RUST_LOG";
/// Use to set the stack size used by uv.
///
/// The value is in bytes, and the default is typically 2MB (2097152).
/// Unlike the normal `RUST_MIN_STACK` semantics, this can affect main thread
/// stack size, because we actually spawn our own main2 thread to work around
/// the fact that Windows' real main thread is only 1MB. That thread has size
/// `max(RUST_MIN_STACK, 4MB)`.
pub const RUST_MIN_STACK: &'static str = "RUST_MIN_STACK";
/// The directory containing the `Cargo.toml` manifest for a package.
#[attr_hidden]
pub const CARGO_MANIFEST_DIR: &'static str = "CARGO_MANIFEST_DIR";

50
crates/uv/src/lib.rs
View File

@ -1819,17 +1819,32 @@ where
}
};
// Windows has a default stack size of 1MB, which is lower than the linux and mac default.
// Running out of stack has been an issue for us. We box types and futures in various places
// to mitigate this, with this being an especially important case.
//
// Non-main threads should all have 2MB, as Rust forces platform consistency there,
// but that can be overridden with the RUST_MIN_STACK environment variable if you need more.
//
// Main thread stack-size is the real issue. There's BIG variety here across platforms
// and it's harder to control (which is why Rust doesn't by default). Notably
// on macOS and Linux you will typically get 8MB main thread, while on Windows you will
// typically get 1MB, which is *tiny*:
// https://learn.microsoft.com/en-us/cpp/build/reference/stack-stack-allocations?view=msvc-170
// We support increasing the stack size to avoid stack overflows in debug mode on Windows. In
// addition, we box types and futures in various places. This includes the `Box::pin(run())`
// here, which prevents the large (non-send) main future alone from overflowing the stack.
let result = if let Ok(stack_size) = std::env::var(EnvVars::UV_STACK_SIZE) {
let stack_size = stack_size.parse().expect("Invalid stack size");
let tokio_main = move || {
//
// To normalize this we just spawn a new thread called main2 with a size we can set
// ourselves. 2MB is typically too small (especially for our debug builds), while 4MB
// seems fine. Also we still try to respect RUST_MIN_STACK if it's set, in case useful,
// but don't let it ask for a smaller stack to avoid messy misconfiguration since we
// know we use quite a bit of main stack space.
let main_stack_size = std::env::var(EnvVars::RUST_MIN_STACK)
.ok()
.and_then(|var| var.parse::<usize>().ok())
.unwrap_or(0)
.max(4 * 1024 * 1024);
let main2 = move || {
let runtime = tokio::runtime::Builder::new_current_thread()
.enable_all()
.thread_stack_size(stack_size)
.build()
.expect("Failed building the Runtime");
// Box the large main future to avoid stack overflows.
@ -1842,22 +1857,13 @@ where
runtime.shutdown_background();
result
};
std::thread::Builder::new()
.stack_size(stack_size)
.spawn(tokio_main)
let result = std::thread::Builder::new()
.name("main2".to_owned())
.stack_size(main_stack_size)
.spawn(main2)
.expect("Tokio executor failed, was there a panic?")
.join()
.expect("Tokio executor failed, was there a panic?")
} else {
let runtime = tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.expect("Failed building the Runtime");
// Box the large main future to avoid stack overflows.
let result = runtime.block_on(Box::pin(run(cli)));
runtime.shutdown_background();
result
};
.expect("Tokio executor failed, was there a panic?");
match result {
Ok(code) => code.into(),

20
crates/uv/tests/it/common/mod.rs
View File

@ -489,12 +489,6 @@ impl TestContext {
// Avoid locale issues in tests
command.env(EnvVars::LC_ALL, "C");
}
if cfg!(all(windows, debug_assertions)) {
// TODO(konstin): Reduce stack usage in debug mode enough that the tests pass with the
// default windows stack of 1MB
command.env(EnvVars::UV_STACK_SIZE, (4 * 1024 * 1024).to_string());
}
}
/// Create a `pip compile` command for testing.
@ -581,13 +575,6 @@ impl TestContext {
let mut command = self.new_command();
command.arg("help");
command.env_remove(EnvVars::UV_CACHE_DIR);
if cfg!(all(windows, debug_assertions)) {
// TODO(konstin): Reduce stack usage in debug mode enough that the tests pass with the
// default windows stack of 1MB
command.env(EnvVars::UV_STACK_SIZE, (4 * 1024 * 1024).to_string());
}
command
}
@ -636,13 +623,6 @@ impl TestContext {
pub fn publish(&self) -> Command {
let mut command = self.new_command();
command.arg("publish");
if cfg!(all(windows, debug_assertions)) {
// TODO(konstin): Reduce stack usage in debug mode enough that the tests pass with the
// default windows stack of 1MB
command.env(EnvVars::UV_STACK_SIZE, (4 * 1024 * 1024).to_string());
}
command
}

5
crates/uv/tests/it/ecosystem.rs
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@ -104,11 +104,6 @@ fn lock_ecosystem_package(python_version: &str, name: &str) -> Result<()> {
.env(EnvVars::UV_EXCLUDE_NEWER, EXCLUDE_NEWER)
.current_dir(context.temp_dir.path());
if cfg!(all(windows, debug_assertions)) {
// TODO(konstin): Reduce stack usage in debug mode enough that the tests pass with the
// default windows stack of 1MB
command.env(EnvVars::UV_STACK_SIZE, (4 * 1024 * 1024).to_string());
}
let (snapshot, _) = common::run_and_format(
&mut command,
context.filters(),

7
crates/uv/tests/it/show_settings.rs
View File

@ -24,13 +24,6 @@ fn add_shared_args(mut command: Command, cwd: &Path) -> Command {
// Avoid locale issues in tests
command.env(EnvVars::LC_ALL, "C");
}
if cfg!(all(windows, debug_assertions)) {
// TODO(konstin): Reduce stack usage in debug mode enough that the tests pass with the
// default windows stack of 1MB
command.env(EnvVars::UV_STACK_SIZE, (4 * 1024 * 1024).to_string());
}
command
}

14
docs/configuration/environment.md
View File

@ -320,10 +320,6 @@ uv will require that all dependencies have a hash specified in the requirements
Equivalent to the `--resolution` command-line argument. For example, if set to
`lowest-direct`, uv will install the lowest compatible versions of all direct dependencies.
### `UV_STACK_SIZE`
Use to increase the stack size used by uv in debug builds on Windows.
### `UV_SYSTEM_PYTHON`
Equivalent to the `--system` command-line argument. If set to `true`, uv will
@ -484,6 +480,16 @@ For example:
See the [tracing documentation](https://docs.rs/tracing-subscriber/latest/tracing_subscriber/filter/struct.EnvFilter.html#example-syntax)
for more.
### `RUST_MIN_STACK`
Use to set the stack size used by uv.
The value is in bytes, and the default is typically 2MB (2097152).
Unlike the normal `RUST_MIN_STACK` semantics, this can affect main thread
stack size, because we actually spawn our own main2 thread to work around
the fact that Windows' real main thread is only 1MB. That thread has size
`max(RUST_MIN_STACK, 4MB)`.
### `SHELL`
The standard `SHELL` posix env var.