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Invalid subprocess commands spawns successfully when running under QEMU
Description of problem:
When executing a subprocess from with a non-existing command EQMU still spawns a process.
Consider this small rust program for instance:
```rust
use std::process::Command;
fn main() {
match Command::new("thisdoesnotexist").spawn() {
Ok(child) => {
println!("Child process id is {}", child.id());
}
Err(_) => {
println!("This should happen");
}
}
}
```
**Executing with `qemu-aarch64`:**
```shell
qemu-aarch64 ./rust-app
Child process id is 20182
```
**Executing regularly:**
```shell
./rust-app
This should happen
```
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