Document for debugging a test case

[scw00]

Hi, is there any more document that explain how to use LOOM_LOG to debug my own app.

use loom::sync::atomic::AtomicUsize;
use loom::sync::atomic::Ordering::{Acquire, Relaxed, Release, SeqCst};
use loom::sync::Arc;
use loom::thread;

#[test]
fn buggy_concurrent_inc() {
    loom::model(|| {
        let v1 = Arc::new(AtomicUsize::new(0));
        let v2 = v1.clone();

        thread::spawn(move || {
            v1.store(1, SeqCst);
        });

        loom::assert_eq
        //assert_eq!(0, v2.load(SeqCst));
    });
}

---- tests::buggy_concurrent_inc::buggy_concurrent_inc stdout ----
 INFO loom::model:
 INFO loom::model:  ================== Iteration 1 ==================
 INFO loom::model:
TRACE iter{1}: loom::rt::atomic: Atomic::new state=Ref<loom::rt::atomic::State>(0)
TRACE iter{1}: loom::rt::arc: Arc::new state=Ref<loom::rt::arc::State>(1) location=src/tests/buggy_concurrent_inc.rs:9:18
TRACE iter{1}: loom::rt::object: Object::branch_action obj=Ref<loom::rt::arc::State>(1) action=RefInc
TRACE iter{1}:thread{id=0}: loom::rt: branch switch=false
TRACE iter{1}:thread{id=0}: loom::rt::arc: Arc::ref_inc state=Ref<loom::rt::arc::State>(1) ref_cnt=2 location=src/tests/buggy_concurrent_inc.rs:10:21
TRACE iter{1}:thread{id=0}: loom::rt::notify: Notify::new state=Ref<loom::rt::notify::State>(2) seq_cst=true spurious=false
TRACE iter{1}:thread{id=0}: loom::rt: spawn thread=Id(1)
TRACE iter{1}:thread{id=0}: loom::rt::object: Object::branch_action obj=Ref<loom::rt::arc::State>(1) action=RefDec
 INFO iter{1}:thread{id=1}: loom::rt::execution: ~~~~~~~~ THREAD 1 ~~~~~~~~
TRACE iter{1}:thread{id=1}: loom::rt: branch switch=true
TRACE iter{1}:thread{id=1}: loom::rt::object: Object::branch_action obj=Ref<loom::rt::atomic::State>(0) action=Store
TRACE iter{1}:thread{id=1}: loom::rt: branch switch=false
TRACE iter{1}:thread{id=1}: loom::rt: synchronize
TRACE iter{1}:thread{id=1}: loom::rt::atomic: Atomic::store state=Ref<loom::rt::atomic::State>(0) ordering=SeqCst
TRACE iter{1}:thread{id=1}: loom::rt::object: Object::branch_action obj=Ref<loom::rt::arc::State>(1) action=RefDec
TRACE iter{1}:thread{id=1}: loom::rt: branch switch=false
TRACE iter{1}:thread{id=1}: loom::rt::arc: Arc::ref_dec state=Ref<loom::rt::arc::State>(1) ref_cnt=1 location=/rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ptr/mod.rs:487:1
TRACE iter{1}:thread{id=1}: loom::rt::object: Object::branch_action obj=Ref<loom::rt::notify::State>(2) action=Opaque
TRACE iter{1}:thread{id=1}: loom::rt: branch switch=false
TRACE iter{1}:thread{id=1}: loom::rt: thread_done: drop locals thread=Id(1)
 INFO iter{1}:thread{id=0}: loom::rt::execution: ~~~~~~~~ THREAD 0 ~~~~~~~~
TRACE iter{1}:thread{id=0}: loom::rt: thread_done: terminate thread=Id(1) switch=true
TRACE iter{1}:thread{id=0}: loom::rt::arc: Arc::ref_dec state=Ref<loom::rt::arc::State>(1) ref_cnt=0 location=/rustc/a55dd71d5fb0ec5a6a3a9e8c27b2127ba491ce52/library/core/src/ptr/mod.rs:487:1
TRACE iter{1}:thread{id=0}: loom::rt: thread_done: drop locals thread=Id(0)
thread 'tests::buggy_concurrent_inc::buggy_concurrent_inc' panicked at 'Reached unexpected exploration state. Is the model fully deterministic?', /Users/chenwei.scw/.cargo/registry/src/github.com-1ecc6299db9ec823/loom-0.5.6/src/rt/path.rs:279:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace