A failure said while a 9P write waits on it posts no msg, only the write's err

A failure the editor said as it performed a write's work (a Save's disk write, a shell, a language server) was posted as a msg and taken back out when the write's err was logged, which it cannot be once a log follower has read it: a follower saw both. Such a failure is now posted without a msg in the first place (fs.write_waits), and nothing is taken back.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 5 insertions, 3 deletions

diff --git a/src/9p_io.zig b/src/9p_io.zig
index 7f490f81..6f05e3ab 100644
--- a/src/9p_io.zig
+++ b/src/9p_io.zig
@@ -312,11 +312,14 @@ pub const Listener = struct {
         if (restoring) l.restore_writer.store(true, .release);
         defer if (restoring) l.restore_writer.store(false, .release);
         core.fs.late_failure_len = 0;
+        // What fails while this waits is this write's err, never a msg too.
+        core.fs.write_waits = true;
         if (core.effects_len != 0) pardes.turn.awaitSettled(epoch);
         if (core.fs.lsp_answer_at) |n| {
             core.fs.lsp_answer_at = null;
             pardes.turn.awaitLsp(n);
         }
+        core.fs.write_waits = false;
         // ponytail: one slot, so a failure of another client's effects that
         // settle in the same wait is told to this write too.
         if (l.core == core and core.fs.late_failure_len != 0) {
@@ -327,9 +330,8 @@ pub const Listener = struct {
                 pardes.ctlfs.E.NOENT
             else if (std.mem.indexOf(u8, late, "no space") != null) pardes.ctlfs.E.NOSPC else pardes.ctlfs.E.IO;
             const failed = pardes.ctlfs.failText(req.tag, errno, late);
-            // Its err record says it (the path in it); the msg the failure
-            // was also said as goes, as a builtin's failing a write does.
-            pardes.ctlfs.events.dropMessage(core, core.fs.late_failure[0..core.fs.late_failure_len]);
+            // Its err record says it (the path in it), the one record: it
+            // was said with no msg while this waited (fs.write_waits).
             pardes.ctlfs.events.noteError(core, req, failed);
             return conn.reply(&failed, "");
         }