fuzz: add timestamp logging to ci-fuzz.sh

Log timestamps at each phase (target verification, write-seeds,
honggfuzz install, build, per-target fuzz start/finish, and
corpus minimization) to identify where time is spent.

AI tools were used in preparing this commit.

Author: joostjager

fuzz/ci-fuzz.sh

@@ -2,6 +2,11 @@
 set -e
 set -x
 
+log_time() {
+	echo ":::: $(date '+%Y-%m-%d %H:%M:%S') $1"
+}
+
+log_time "Verifying generated targets"
 pushd src/msg_targets
 rm msg_*.rs
 ./gen_target.sh
@@ -15,12 +20,14 @@ popd
 
 export RUSTFLAGS="--cfg=secp256k1_fuzz --cfg=hashes_fuzz"
 
+log_time "Generating write-seeds"
 mkdir -p hfuzz_workspace/full_stack_target/input
 pushd write-seeds
 RUSTFLAGS="$RUSTFLAGS --cfg=fuzzing" cargo run ../hfuzz_workspace/full_stack_target/input
 cargo clean
 popd
 
+log_time "Installing honggfuzz"
 cargo install --color always --force honggfuzz --no-default-features
 
 # Because we're fuzzing relatively few iterations, the maximum possible
@@ -29,20 +36,24 @@ sed -i 's/lto = true//' Cargo.toml
 
 export HFUZZ_BUILD_ARGS="--features honggfuzz_fuzz"
 
+log_time "Building fuzz targets"
 cargo --color always hfuzz build -j8
+
+log_time "Starting fuzz runs"
 for TARGET in src/bin/*.rs; do
 	FILENAME=$(basename $TARGET)
 	FILE="${FILENAME%.*}"
 	CORPUS_DIR="hfuzz_workspace/$FILE/input"
 	CORPUS_COUNT=$(find "$CORPUS_DIR" -type f 2>/dev/null | wc -l)
-	echo "Fuzzing $FILE (corpus: $CORPUS_COUNT files)"
 	ITERATIONS=$((CORPUS_COUNT * 3 + 1000))
+	log_time "Fuzzing $FILE (corpus: $CORPUS_COUNT, iterations: $ITERATIONS)"
 	HFUZZ_RUN_ARGS="--exit_upon_crash -n8 -N $ITERATIONS --run_time 300"
 	if [ "$FILE" = "chanmon_consistency_target" -o "$FILE" = "fs_store_target" ]; then
 		HFUZZ_RUN_ARGS="$HFUZZ_RUN_ARGS -F 64"
 	fi
 	export HFUZZ_RUN_ARGS
 	cargo --color always hfuzz run $FILE
+	log_time "Finished $FILE"
 	if [ -f hfuzz_workspace/$FILE/HONGGFUZZ.REPORT.TXT ]; then
 		cat hfuzz_workspace/$FILE/HONGGFUZZ.REPORT.TXT
 		for CASE in hfuzz_workspace/$FILE/SIG*; do
@@ -54,11 +65,17 @@ done
 
 # On main, minimize the corpus to keep the cache size manageable.
 if [ "$GITHUB_REF" = "refs/heads/main" ]; then
+	log_time "Starting corpus minimization"
 	for TARGET in src/bin/*.rs; do
 		FILENAME=$(basename $TARGET)
 		FILE="${FILENAME%.*}"
+		log_time "Minimizing $FILE"
 		HFUZZ_RUN_ARGS="-M -n8"
 		export HFUZZ_RUN_ARGS
 		cargo --color always hfuzz run $FILE
+		log_time "Finished minimizing $FILE"
 	done
+	log_time "Corpus minimization complete"
 fi
+
+log_time "Done"