temporary: Dump the threads stack traces when .wait_task() times out

Signed-off-by: Martin Tzvetanov Grigorov <mgrigorov@apache.org>

.cargo/config.toml

@@ -1,2 +1,5 @@
 [alias]
 xtask = "run --release --package xtask --"
+
+[build]
+rustflags = ["--cfg", "tokio_unstable", "--cfg", "tokio_taskdump"]

.github/workflows/test-suite.yml

@@ -158,6 +158,8 @@ jobs:
         uses: Swatinem/rust-cache@v2.7.8
       - name: Run tests in debug
         uses: actions-rs/cargo@v1
+        env:
+          RUSTFLAGS: "--cfg tokio_unstable --cfg tokio_taskdump"
         with:
           command: test
           args: --locked --all

crates/meilisearch/tests/common/server.rs

@@ -400,14 +400,10 @@ impl<State> Server<State> {
         // try several times to get status, or panic to not wait forever
         let url = format!("/tasks/{}", update_id);
         // Increase timeout for vector-related tests
-        let max_attempts = if url.contains("/tasks/") {
-            if update_id > 1000 {
+        let max_attempts = if update_id > 1000 {
             400 // 200 seconds for vector tests
         } else {
             100 // 50 seconds for other tests
-            }
-        } else {
-            100 // 50 seconds for other tests
         };
 
         for _ in 0..max_attempts {
@@ -421,6 +417,14 @@ impl<State> Server<State> {
             // wait 0.5 second.
             sleep(Duration::from_millis(500)).await;
         }
+        let handle = tokio::runtime::Handle::current();
+        if let Ok(dump) = tokio::time::timeout(Duration::from_secs(2), handle.dump()).await {
+            for (i, task) in dump.tasks().iter().enumerate() {
+                let trace = task.trace();
+                println!("TASK {i}:");
+                println!("{trace}\n");
+            }
+        }
         panic!("Timeout waiting for update id");
     }