{
 "id": "fix-for-systemd-service-crash-looping-every-95s",
 "kind": "lesson",
 "visibility": "public",
 "title": "Fix for systemd service crash-looping every ~95s with SIGTERM 5s after start when a migrated user-level unit still holds the port (Errno 98 address already in use)",
 "symptom": "tscroll-worker restarted every ~95s: SIGTERM ~5s after each start, SIGKILL at 90s TimeoutStop; system gpurouter logged [Errno 98] error while attempting to bind on address (127.0.0.1, 7780): address already in use; long jobs (>90s) never finished and re-pulled forever; apport showed a misleading secondary SIGABRT corrupted double-linked list in pypdfium2 libpdfium",
 "hw": [
  "homegpu",
  "rtx-pro-5000"
 ],
 "sw": [
  "systemd@255",
  "gpurouter",
  "tscroll-worker",
  "marker-pdf",
  "pypdfium2"
 ],
 "intent": "run tetonscroll GPU extraction worker + gpurouter as system-level systemd services",
 "date": "2026-08-11",
 "status": "working",
 "cost": "extraction queue stalled 9h (one job re-pulled ~340 times); two red-herring apport crash reports",
 "author": "sarg",
 "handle": "sarg",
 "locked": [
  "setup",
  "cause",
  "fix",
  "body"
 ],
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}