[Bug 255436] nfs client panic with non-sleepable locks on 14.0-CURRENT main-n246340-01bad87a76d

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255436

            Bug ID: 255436
           Summary: nfs  client panic with non-sleepable locks on
                    14.0-CURRENT main-n246340-01bad87a76d
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ish at amail.plala.or.jp

Created attachment 224466
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224466&action=edit
core.txt

On 14.0-CURRENT main-n246340-01bad87a76d

Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex nfs_clstate_mutex (nfs_clstate_mutex) r = 0
(0xffffffff81e7e640) locked @ /usr/src/sys/fs/nfsclient/nfs_clstate.c:3303

# cat info.last
Dump header from device: /dev/gpt/fbswap
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 609054720
  Blocksize: 512
  Compression: none
  Dumptime: 2021-04-27 12:42:40 +0900
  Hostname: carrot.ish.org
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 14.0-CURRENT #31 main-n246340-01bad87a76d-dirty: Tue
Apr 27 11:51:50 JST 2021
    ishizuka at okra.ish.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC
  Panic String: page fault
  Dump Parity: 732936796
  Bounds: 3
  Dump Status: good

vmcore.3 was saved on https://www.ish.org/files/vmcore.3-n246340.xz

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