CONTAP-496717: ONTAP FAS systems with Flash Pool can experience intermittent process hang disruptions
Issue
- ONTAP FAS systems with Flash Pool configurations can experience intermittent controller disruptions due to an internal process deadlock.
- Panic signature:
PANIC: process on cpu16 hung (wafl_exempt01) for 5002 milliseconds! in SK process mpcleaner_thread1 on release 9.16.1P4 (C) on Wed Jul 9 21:14:16 PDT 2025
- The software routines that are involved:
process hung from possible deadlock between wafl_ssd_alloc_hash_set_reused() and wafl_extent_hash_remove_unique()