Hello,

I'm using a function from C library in which I need to pass a callback function and some optional user data.

In my case I'm passing some user data. My rust user data is of type:

Arc<RwLock<SomeStruct>>

The code that sets the callback function looks like this:

let user_data = Box::new(self.data.clone());

unsafe { the_c_api_function(Self::my_callback_function, Box::into_raw(user_data));

In my callback I do:

let data = Box::from_raw(user_data)

let guard = callbacks.read().unwrap() // <-- Here it seems to crash (that's what the debugger seems to be showing)

Here is the stack:

• core::sync::atomic::atomic_load atomic.rs:3950
• [Inlined] core::sync::atomic::AtomicU32::load atomic.rs:2879
• std::sys::sync::rwlock::futex::RwLock::read futex.rs:95
• std::sync::poison::rwlock::RwLock::read rwlock.rs:394
• my_module

Thank you very much in advance for any help and time

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