docs(buglog): log worker signal and launch-type issues (bug-1954..bug-1956)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.wolf/bugs/bug-1955.md

@@ -0,0 +1,65 @@
+---
+id: "bug-1955"
+status: "open"
+status_updated: "2026-10-10"
+status_note: "newly logged"
+component: "worker"
+severity: "wrong-result"
+timestamp: "2026-10-10T08:46:10Z"
+last_seen: "2026-10-10T08:46:10Z"
+occurrences: 1
+files: ["src/worker/src/controller_connector.c"]
+tags: ["worker", "job-control", "parallel", "signal"]
+related: ["bug-1942", "bug-1908"]
+---
+
+# bug-1955: xcecd drops a signal for a remote task of a multi-host job that is still starting
+
+## Description
+**Observed:** (source reading, 2026-10-10; found while fixing bug-1942)
+Only the head host's job start opens the pending-signal window
+(`pending_signal_start(d->jobid)`, `src/worker/src/controller_connector.c:1062`,
+bug-1908). The runtasks handler for remote tasks (`handle_runtasks()`, `:1147`)
+never does, so a signal that arrives before the remote task's worker entry is
+registered is logged and dropped:
+```c
+XCECD_LOG(XCE_LOG_ERROR, "Failed to find worker for job ID: %s", jobidStr);
+FREEUP(task_ctx);
+return -1;                               /* controller_connector.c:1606 */
+```
+Since bug-1942 every host of a multi-host job receives job control, so this
+window is now reachable.
+
+**Expected:** like the head host (bug-1908), a signal for a remote task that
+is starting is kept and delivered once the task runs.
+**Impact:** wrong result: a kill or stop sent right after a multi-host job
+starts can miss some of its remote tasks, which keep running.
+**Found by:** review of the bug-1940/1942 fixes, 2026-10-10.
+## Environment
+- OS: no /etc/os-release; Docker container; NixOS kernel; kernel Linux 6.18.33 x86_64
+- libc: glibc 2.42-47 (interpreter /nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/ld-linux-x86-64.so.2)
+- Toolchain: gcc (GCC) 15.2.0, meson 1.9.1
+- Build: asan (xce.build)
+- Code: scheduler-framework @ 8568c8ab-dirty
+- Deployment: real `xcecd` worker (systemd/dbus); multi-host for the remote-task case
+
+## Reproduction
+1. Submit a multi-host job (e.g. `/xce-test-multihost` topology) and kill it
+   immediately after dispatch.
+2. A remote host logs "Failed to find worker for job ID" and its task keeps
+   running.
+- Frequency: deterministic by code reading (not yet run)
+- Evidence: the code quoted in Description; no logs kept.
+## Root cause
+TODO: required for fixed/partial
+
+## Fix
+TODO: required for fixed/partial
+
+## Verification
+- Test: TODO: name + file; RED before the fix, GREEN after
+- Suites: TODO: suite results and build profile
+- Live: TODO: soak/deploy run, or n/a and why
+
+## References
+- Related: none