os2.pipe() -> Assert error

[m-rei]

Context

I am calling this code from a threadpool with a size of 10, rapidly:

log.info("creating pipe")
r, w := os2.pipe() or_return
log.info("creating pipe -done")

and sometimes i get an error!
I'm trying to pipe the result of a command I'm calling back to my application and continue processing that...

the full proc looks like this:

@(private)
exec_curl :: proc(url: string) -> (output: string, err: os2.Error) {
    r, w := os2.pipe() or_return // TODO this appears to be buggy, issue: https://github.com/odin-lang/Odin/issues/4712
    defer os2.close(r)

    p: os2.Process;
    {
        defer os2.close(w)

        p = os2.process_start({
            command = {"curl", "-i", "-H \"Connection: close\"", url},
            stdout = w,
        }) or_return
    }

    out := os2.read_entire_file(r, context.allocator) or_return
    _, err = os2.process_wait(p)
    if err != nil {
        delete(out)
        return
    }
    output = string(out)

    return
}

Edit: to add a bit more context: I have a Tracking_Allocator setup and the thread pool is setup this way:

thread.pool_init(&worker_thread_pool, context.allocator, WORKER_POOL_SIZE)
defer thread.pool_destroy(&worker_thread_pool)
for &t in worker_thread_pool.threads {
	t.init_context = context
}
thread.pool_start(&worker_thread_pool)

and the connection pool this way:

    connection_thread_pool: thread.Pool
    thread.pool_init(&connection_thread_pool, context.allocator, CONNECTION_POOL_SIZE)
    defer thread.pool_destroy(&connection_thread_pool)
    for &t in connection_thread_pool.threads {
        t.init_context = context
    }
    thread.pool_start(&connection_thread_pool)

note: they all share the same context thus the same allocator.
perhaps this is relevant for tracking down the issue!

• Operating System & Odin Version:
• Please paste odin report output:
  Odin: dev-2025-01-nightly
  OS: Fedora Linux 41 (Forty One), Linux 6.12.6-200.fc41.x86_64
  CPU: 12th Gen Intel(R) Core(TM) i5-12400
  RAM: 31821 MiB
  Backend: LLVM 18.1.6

Expected Behavior

No assertion failure

Current Behavior

Assertion failure

Failure Information (for bugs)

/opt/odin/core/os/os2/heap_linux.odin(316:2) runtime assertion: alloc.free_idx == NOT_FREE
71888 Illegal instruction

Steps to Reproduce

1. setup a thread pool with a size of 10
2. create tasks (in rapid succession) which call:
3. r, w := os2.pipe() or_return
4. let it run for a while

Failure Logs

See screenshot for stacktrace~:

[laytan]

Looks like an issue in the thread safety of the allocator, @jasonKercher are you able to have a look at this?

[jasonKercher]

I can take a look at it tomorrow. However, I think it might be best to just drop that allocator in favor of malloc for now until there is a general purpose allocator in base.