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>

2026-10-10 08:46:24 +00:00

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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:

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

Submit a multi-host job (e.g. /xce-test-multihost topology) and kill it immediately after dispatch.
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