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fix(worker): address concurrency, cancellation, and resource issues

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- claude process: run stdout/stderr reads without ct; rely on
  kill-on-cancel closing the pipes to unblock them — previously
  ReadLineAsync(ct) could hang, stalling task slots and shutdown
- task runner: terminal db writes (task_runs, MarkDone, MarkFailed,
  SetLogPath) now use CancellationToken.None; RunOnceAsync catches
  OCE and finalizes the run row so ContinueAsync can resume
- task repository: GetNextQueuedAgentTaskAsync is now a single
  UPDATE ... RETURNING statement — closes TOCTOU window where two
  loop iterations could dispatch the same queued task
- queue service: dispose CancellationTokenSource in slot-completion
  ContinueWith to stop leaking wait handles
- git service: register ct.Kill(processTree), drain reads without ct,
  always reap via WaitForExitAsync(None) — no more git zombies on
  cancelled worktree ops
- worktree manager: branch name uses full task id (dashes stripped)
  instead of 8-char prefix, eliminating collision risk

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Mika Kuns
2026-04-15 16:27:18 +02:00
parent fc9029de97
commit d3b85f2234
7 changed files with 122 additions and 57 deletions
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20
src/ClaudeDo.Data/Git/GitService.cs
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@@ -104,20 +104,34 @@ public sealed class GitService
using var proc = new Process { StartInfo = psi };
proc.Start();
// On cancellation: kill the git process tree. Killing closes the
// redirected pipes, which unblocks the ReadToEndAsync calls below
// and lets WaitForExitAsync return so the process is reaped.
// Without this, cancelling mid-git leaves zombie processes.
await using var ctr = ct.Register(() =>
{
try { proc.Kill(entireProcessTree: true); }
catch { /* already exited */ }
});
if (stdinData is not null)
{
await proc.StandardInput.WriteAsync(stdinData.AsMemory(), ct);
proc.StandardInput.Close();
}
var stdoutTask = proc.StandardOutput.ReadToEndAsync(ct);
var stderrTask = proc.StandardError.ReadToEndAsync(ct);
// Drain output without ct — pipes close when the process exits
// (whether naturally or via Kill above), so these always complete.
var stdoutTask = proc.StandardOutput.ReadToEndAsync();
var stderrTask = proc.StandardError.ReadToEndAsync();
await proc.WaitForExitAsync(ct);
await proc.WaitForExitAsync(CancellationToken.None);
var stdout = await stdoutTask;
var stderr = await stderrTask;
ct.ThrowIfCancellationRequested();
return (proc.ExitCode, stdout.TrimEnd(), stderr.TrimEnd());
}
}

16
src/ClaudeDo.Data/Repositories/TaskRepository.cs
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@@ -174,12 +174,18 @@ public sealed class TaskRepository
public async Task<TaskEntity?> GetNextQueuedAgentTaskAsync(DateTime now, CancellationToken ct = default)
{
// Atomically claim the next queued agent task: the UPDATE flips its
// status to 'running' in the same statement that returns its row,
// eliminating the TOCTOU gap where two queue-loop iterations could
// both select the same queued task before either marked it running.
// The caller is responsible for populating started_at shortly after.
await using var conn = _factory.Open();
await using var cmd = conn.CreateCommand();
cmd.CommandText = """
SELECT t.id, t.list_id, t.title, t.description, t.status, t.scheduled_for,
t.result, t.log_path, t.created_at, t.started_at, t.finished_at, t.commit_type,
t.model, t.system_prompt, t.agent_path
UPDATE tasks
SET status = 'running'
WHERE id = (
SELECT t.id
FROM tasks t
WHERE t.status = 'queued'
AND (t.scheduled_for IS NULL OR t.scheduled_for <= @now)
@@ -194,6 +200,10 @@ public sealed class TaskRepository
)
ORDER BY t.created_at ASC
LIMIT 1
)
RETURNING id, list_id, title, description, status, scheduled_for,
result, log_path, created_at, started_at, finished_at, commit_type,
model, system_prompt, agent_path
""";
cmd.Parameters.AddWithValue("@now", now.ToString("o"));

17
src/ClaudeDo.Worker/Runner/ClaudeProcess.cs
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@@ -45,6 +45,9 @@ public sealed class ClaudeProcess : IClaudeProcess
var analyzer = new StreamAnalyzer();
var lastStderr = new StringBuilder();
// On cancellation: kill the tree. Killing closes the redirected pipes,
// which unblocks the ReadLineAsync loops below (which run without ct
// so they reliably drain instead of hanging on cancellation).
await using var ctr = ct.Register(() =>
{
try { process.Kill(entireProcessTree: true); }
@@ -53,26 +56,30 @@ public sealed class ClaudeProcess : IClaudeProcess
var stdoutTask = Task.Run(async () =>
{
while (await process.StandardOutput.ReadLineAsync(ct) is { } line)
while (await process.StandardOutput.ReadLineAsync() is { } line)
{
if (string.IsNullOrEmpty(line)) continue;
await onStdoutLine(line);
analyzer.ProcessLine(line);
}
}, ct);
});
var stderrTask = Task.Run(async () =>
{
while (await process.StandardError.ReadLineAsync(ct) is { } line)
while (await process.StandardError.ReadLineAsync() is { } line)
{
if (string.IsNullOrEmpty(line)) continue;
lastStderr.AppendLine(line);
await onStdoutLine($"[stderr] {line}");
}
}, ct);
});
await Task.WhenAll(stdoutTask, stderrTask);
await process.WaitForExitAsync(ct);
await process.WaitForExitAsync(CancellationToken.None);
// If we were asked to cancel, surface that to the caller now that
// the process is fully reaped.
ct.ThrowIfCancellationRequested();
var exitCode = process.ExitCode;
var streamResult = analyzer.GetResult();

41
src/ClaudeDo.Worker/Runner/TaskRunner.cs
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@@ -232,6 +232,8 @@ public sealed class TaskRunner
await using var logWriter = new LogWriter(logPath);
try
{
var result = await _claude.RunAsync(
arguments,
prompt,
@@ -243,7 +245,9 @@ public sealed class TaskRunner
},
ct);
// Update the run record with results.
// Update the run record with results. Use CancellationToken.None:
// this is a terminal write that must always complete, even if the
// caller's token is already cancelled.
run.SessionId = result.SessionId;
run.ResultMarkdown = result.ResultMarkdown;
run.StructuredOutputJson = result.StructuredOutputJson;
@@ -253,13 +257,32 @@ public sealed class TaskRunner
run.TokensIn = result.TokensIn;
run.TokensOut = result.TokensOut;
run.FinishedAt = DateTime.UtcNow;
await _runRepo.UpdateAsync(run, ct);
await _runRepo.UpdateAsync(run, CancellationToken.None);
// Update denormalized fields on the task.
await _taskRepo.SetLogPathAsync(taskId, logPath, ct);
await _taskRepo.SetLogPathAsync(taskId, logPath, CancellationToken.None);
return result;
}
catch (OperationCanceledException)
{
// Ensure the run row is completed so ContinueAsync / inspection
// isn't left staring at a null session_id / finished_at.
run.ErrorMarkdown = "Cancelled.";
run.ExitCode = -1;
run.FinishedAt = DateTime.UtcNow;
try
{
await _runRepo.UpdateAsync(run, CancellationToken.None);
await _taskRepo.SetLogPathAsync(taskId, logPath, CancellationToken.None);
}
catch (Exception updateEx)
{
_logger.LogError(updateEx, "Failed to finalize cancelled run {RunId} for task {TaskId}", runId, taskId);
}
throw;
}
}
private async Task HandleSuccess(TaskEntity task, ListEntity list, string slot, WorktreeContext? wtCtx, RunResult result, CancellationToken ct)
{
@@ -270,8 +293,11 @@ public sealed class TaskRunner
await _broadcaster.WorktreeUpdated(task.Id);
}
// Terminal DB write uses CancellationToken.None so the task status
// is never left as 'running' because of a cancel that arrived
// after the Claude run already succeeded.
var finishedAt = DateTime.UtcNow;
await _taskRepo.MarkDoneAsync(task.Id, finishedAt, result.ResultMarkdown, ct);
await _taskRepo.MarkDoneAsync(task.Id, finishedAt, result.ResultMarkdown, CancellationToken.None);
await _broadcaster.TaskFinished(slot, task.Id, "done", finishedAt);
_logger.LogInformation("Task {TaskId} completed (turns={Turns}, tokens_in={In}, tokens_out={Out})",
task.Id, result.TurnCount, result.TokensIn, result.TokensOut);
@@ -279,8 +305,10 @@ public sealed class TaskRunner
private async Task HandleFailure(string taskId, string slot, RunResult result)
{
// Intentionally does not accept a CancellationToken: this is the
// terminal write for a failed task and must always be persisted.
var finishedAt = DateTime.UtcNow;
await _taskRepo.MarkFailedAsync(taskId, finishedAt, result.ErrorMarkdown);
await _taskRepo.MarkFailedAsync(taskId, finishedAt, result.ErrorMarkdown, CancellationToken.None);
await _broadcaster.TaskFinished(slot, taskId, "failed", finishedAt);
_logger.LogWarning("Task {TaskId} failed (turns={Turns}): {Error}", taskId, result.TurnCount, result.ErrorMarkdown);
}
@@ -290,7 +318,8 @@ public sealed class TaskRunner
try
{
var now = DateTime.UtcNow;
await _taskRepo.MarkFailedAsync(taskId, now, error);
// Terminal write — never cancel.
await _taskRepo.MarkFailedAsync(taskId, now, error, CancellationToken.None);
await _broadcaster.TaskFinished(slot, taskId, "failed", now);
await _broadcaster.TaskUpdated(taskId);
}

6
src/ClaudeDo.Worker/Runner/WorktreeManager.cs
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@@ -31,8 +31,10 @@ public sealed class WorktreeManager
throw new InvalidOperationException($"working_dir is not a git repository: {workingDir}");
var baseCommit = await _git.RevParseHeadAsync(workingDir, ct);
var shortId = task.Id.Length >= 8 ? task.Id[..8] : task.Id;
var branchName = $"claudedo/{shortId}";
// Use the full task id (dashes stripped) in the branch name so
// two GUIDs sharing an 8-char prefix cannot collide on the same branch.
var idForBranch = task.Id.Replace("-", "");
var branchName = $"claudedo/{idForBranch}";
var slug = CommitMessageBuilder.ToSlug(list.Name);
var worktreePath = _cfg.WorktreeRootStrategy.Equals("central", StringComparison.OrdinalIgnoreCase)

3
src/ClaudeDo.Worker/Services/QueueService.cs
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@@ -71,6 +71,7 @@ public sealed class QueueService : BackgroundService
_ = RunInSlotAsync(task, "override", cts.Token).ContinueWith(_ =>
{
lock (_lock) { _overrideSlot = null; }
cts.Dispose();
}, TaskScheduler.Default);
}
}
@@ -94,6 +95,7 @@ public sealed class QueueService : BackgroundService
_ = RunContinueInSlotAsync(taskId, followUpPrompt, cts.Token).ContinueWith(_ =>
{
lock (_lock) { _overrideSlot = null; }
cts.Dispose();
}, TaskScheduler.Default);
}
@@ -155,6 +157,7 @@ public sealed class QueueService : BackgroundService
_ = RunInSlotAsync(task, "queue", cts.Token).ContinueWith(_ =>
{
lock (_lock) { _queueSlot = null; }
cts.Dispose();
WakeQueue(); // Check for next task immediately.
}, TaskScheduler.Default);
}

2
tests/ClaudeDo.Worker.Tests/Runner/WorktreeManagerTests.cs
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@@ -63,7 +63,7 @@ public class WorktreeManagerTests : IDisposable
Assert.NotNull(ctx);
Assert.True(Directory.Exists(ctx.WorktreePath));
Assert.Equal($"claudedo/{task.Id[..8]}", ctx.BranchName);
Assert.Equal($"claudedo/{task.Id.Replace("-", "")}", ctx.BranchName);
Assert.Equal(repo.BaseCommit, ctx.BaseCommit);
var row = await wtRepo.GetByTaskIdAsync(task.Id);