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-1954: xcecd_worker sends SIGTERM for a KILL request without force and SIGSTOP for a TSTP request

Description

Observed: (source reading, 2026-10-10; found while fixing bug-1940) worker_signal_callback() (src/worker/src/xcecd_worker.c:1115-1130) replaces the requested signal:

case SIGTERM:
case SIGKILL:
    if (force) { success = signal_gid_except_self(SIGKILL); }
    else       { success = signal_gid_except_self(SIGTERM); }
...
case SIGSTOP:
case SIGTSTP:
    success = signal_gid_except_self(SIGSTOP);

Since bug-1940 the requested signal reaches the worker, but an explicit kill -s KILL without force still sends SIGTERM, and an explicit TSTP is sent as the uncatchable SIGSTOP.

Expected: the job receives the signal the user asked for; force kill (SIGKILL) stays available for a default kill. Impact: wrong result: a job that ignores SIGTERM survives an explicit SIGKILL request; a job that handles SIGTSTP to checkpoint or clean up cannot do so. 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

Run a job that traps TERM (trap '' TERM; sleep 600).
POST /xce/v1/jobs/<id>/control with action kill, signal SIGKILL, force_kill false.
The job keeps running (it received SIGTERM).

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