AI model stuck indefinitely when using Read Search View/Rg tool calls

[npechett-wtg]

Describe the bug

Copilot CLI 1.0.88 (Linux, gpt-6-sol): intermittent in-chat parallel-tool stall.
Expected: ten file reads/searches finish.
Actual: sometimes none finish until the user interrupts.
Identical batches both succeed and stall.
Cause unknown.

Affected version

No response

Steps to reproduce the behavior

### COPY THIS INTO A FRESH COPILOT CLI CHAT:

Run the setup command ONCE with the shell tool. Replace ROOT below with its
printed REPRO_ROOT. Submit all ten view/rg calls in ONE parallel chat batch
in the exact order shown. If they complete, repeat the IDENTICAL batch in
the next turn; KEEP GOING UNTIL IT STALLS. Do not stop after successes or set
a retry limit. The user will interrupt a stalled batch. Do not start another
batch while stalled. Do not launch another copilot process, use a Search
subagent, or run the ten calls via shell.

python3 - <<'PY'
from pathlib import Path
import tempfile

root = Path(tempfile.mkdtemp(prefix='copilot-parallel-generic-'))
files = [
('web/pages/Orders.jsp', 1088, 46, '<script> function updateField() { var x = getValue(); } </script>', '\n'),
('web/pages/FormHandlers.jspf', 1166, 33, 'function onChange() { return event.target.value; }', '\r\n'),
('src/main/java/com/example/web/OrderDetail.java', 3664, 35, 'private String value = lookupResult(); // generated placeholder', '\n'),
('src/main/java/com/example/data/OrderRepository.java', 10195, 41, 'private String value = lookupResult(); // generated placeholder', '\n'),
]
for name, count, average, default, newline in files:
path = root / name
path.parent.mkdir(parents=True, exist_ok=True)
lines = []
for i in range(1, count + 1):
text = default
if name.endswith('OrderDetail.java') and i % 37 == 0:
text = 'void populateFieldMap() { getFieldObject("ORDER_FIELD.VALUE"); }'
elif name.endswith('OrderRepository.java') and i % 47 == 0:
text = 'RepositoryUtil.standardizeFieldNames(); setFields();'
width = max(1, average + (i * 37) % 71 - 35)
lines.append((text + ' field = normalize(value);' * 12)[:width])
path.write_bytes((newline.join(lines) + newline).encode('ascii'))
print('REPRO_ROOT=' + str(root))
for name, _, _, _, _ in files:
path = root / name
print(name, len(path.read_bytes()), 'bytes')
PY

Use native tools; for rg set output_mode="content" and -n=true throughout:

1. view path=ROOT/web/pages/Orders.jsp view_range=[740,825]
2. view path=ROOT/web/pages/FormHandlers.jspf view_range=[925,1120]
3. view path=ROOT/src/main/java/com/example/web/OrderDetail.java view_range=[2570,2690]
4. rg paths=ROOT/src/main/java/com/example/web/OrderDetail.java
   pattern='void populateFieldMap|populateFieldMap(|getFieldObject|ORDER_FIELD.VALUE' head_limit=55
5. rg paths=ROOT/src/main/java/com/example/data/OrderRepository.java
   pattern='getOrders(long accountId|RepositoryUtil.standardizeFieldNames|setFields(' head_limit=25
6. view path=ROOT/web/pages/Orders.jsp view_range=[765,790]
7. view path=ROOT/web/pages/FormHandlers.jspf view_range=[971,1006]
8. view path=ROOT/src/main/java/com/example/web/OrderDetail.java view_range=[2600,2640]
9. rg paths=ROOT/src/main/java/com/example/web/OrderDetail.java
   pattern='populateFieldMap|lookupResult|ORDER_FIELD' head_limit=12
10. rg paths=ROOT/src/main/java/com/example/data/OrderRepository.java
    pattern='standardizeFieldNames|setFields|normalize(' head_limit=12

After all steps, KEEP RUNNING THE SAME TEN-CALL PARALLEL BATCH UNTIL IT
GETS STUCK. Do not stop after successful batches; the user will interrupt.

After interruption, report the stalled batch start time, tool completions,
and version. Logs: ~/.copilot/logs/process-1790592807262-37858.log and
~/.copilot/session-state/397d59e2-15bf-4098-a4ef-8ebb209fd695/events.jsonl
(inspect/redact logs before sharing; they may include unrelated private data).

Expected behavior

Stuck forever for 10 secs search call. Fix please.
Happening frequently in session.

Additional context

No response