[Bug 257291] [panic] panic: deadlres_td_sleep_q: possible deadlock detected on 14.0-n248045-76fffd0a865

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257291

            Bug ID: 257291
           Summary: [panic] panic: deadlres_td_sleep_q: possible deadlock
                    detected on 14.0-n248045-76fffd0a865
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ish@amail.plala.or.jp

Created attachment 226561
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=226561&action=edit
core.txt

On 14-curent n248045-76fffd0a865, panic occured.

% cat info.last 
Dump header from device: /dev/gpt/fbswap
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 1568919552
  Blocksize: 512
  Compression: none
  Dumptime: 2021-07-20 00:35:20 +0900
  Hostname: carrot.ish.org
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 14.0-CURRENT #3 master-n248045-76fffd0a865-dirty: Sun
Jul 18 20:38:04 JST 2021
    ishizuka@okra.ish.org:/usr/obj/usr/src/amd64.amd64/sys/SG_UDF2
  Panic String: deadlres_td_sleep_q: possible deadlock detected for
0xfffffe00cdc6b720 (find), blocked for 1802049 ticks

  Dump Parity: 3215715396
  Bounds: 1
  Dump Status: good

vmcore.1 was saved at https://www.ish.org/files/vmcore-n248045.1.xz (863
megabytes).

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