Bug: (WASI) Failed to create directory with trailing backslash
ethanstanley3 opened this issue · comments
Summary
echo "`wasmedge -v` | `rustc -V` | `uname -m`"
wasmedge version 0.13.5 | rustc 1.76.0 (07dca489a 2024-02-04) | x86_64
Compiling a Rust test case to wasm32-wasi and running it with the WasmEdge CLI raises an exception, when the expected behavior is to succeed. The test case (shown below) is relatively simple. It attempts to create a new directory.
use std::fs;
fn main() {
fs::create_dir("foo/").unwrap();
}
The test case runs successfully if the trailing slash in the directory name is omitted (foo/ is replaced with foo). The exception raised by the test case is ENOENT.
The 2018 edition of POSIX states that mkdir raises an ENOENT exception when "A component of the path prefix specified by path does not name an existing directory or path is an empty string", where a path prefix prefix is defined as "The part of a pathname up to, but not including, the last component and any trailing characters"
The path prefix of foo/ is the empty string, which does not contain components naming a non-existent directory. Therefore, a ENOENT exception should not be raised.
The test case runs successfully when given to other Wasm runtimes (Wasmtime, Wasmer, WAMR, and Wasmi) as well as when compiled to x86_64_unknown_linux_gnu and run natively.
This test case was derived from a program generated by Wasimilar, an Xsmith-based random program generator.
Current State
The test case fails to create a new directory and rasies an ENOENT exception.
Here is my observed output:
thread 'main' panicked at src/main.rs:4:28:
called `Result::unwrap()` on an `Err` value: Os { code: 44, kind: NotFound, message: "No such file or directory" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[2024-02-21 23:47:10.078] [error] execution failed: unreachable, Code: 0x89
[2024-02-21 23:47:10.078] [error] In instruction: unreachable (0x00) , Bytecode offset: 0x00006b2a
[2024-02-21 23:47:10.078] [error] When executing function name: "_start"
Expected State
The test case should create a directory, foo, without raising an exception.
Reproduction steps
Here is a zip file of a rust project that reproduces the behavior:
wasmedge-mkdir-bug.zip
- Unzip wasmedge-mkdir-bug.zip
- Go to
wasmedge-mkdir-bug - Compile with
cargo build --target wasm32-wasi - Run with
wasmedge --dir=. target/wasm32-wasi/debug/wasmedge-mkdir-bug.wasm - Observe that an exception is thrown with the message "No such file or directory"
Screenshots
No response
Any logs you want to share for showing the specific issue
No response
Components
CLI
WasmEdge Version or Commit you used
0.13.5
Operating system information
Ubuntu 22.04
Hardware Architecture
x86_64
Compiler flags and options
No response
Hi @ethanstanley3
Thanks for raising this; I will mark it as a good first issue so people can have a chance to fix it.
