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CONTAP-496717: ONTAP FAS systems with Flash Pool can experience intermittent process hang disruptions

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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()

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