[Bug 236021] UFS w/ SU] [hang] Hang seen when using a FS with the block size of 65536

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236021

            Bug ID: 236021
           Summary: UFS w/ SU] [hang] Hang seen when using a FS with the
                    block size of 65536
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: stress2
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org

This is an old problem seen in a stress test:

b:0:pho>  ps
  pid  ppid  pgrp   uid  state   wmesg   wchan               cmd
74743  2616 74743     0  Ds      newbuf  0xffffffff81a12af8  sshd
74742 74740  2247     0  DV      newbuf  0xffffffff81a12af8  sh
74740  2247  2247     0  D       ppwait  0xfffff8013bf5ca20  sh
74739 74737  2779     0  DE      newbuf  0xffffffff81a12af8  sed
74737 74736  2779     0  S       wait    0xfffff80d806aa530  sh
74736  2789  2779     0  S       piperd  0xfffff802250bdbe0  sh
74733  2789  2779     0  DE      newbuf  0xffffffff81a12af8  vmstat
68310 41506  2706     0  D+      biowr   0xfffffe00020ebf78  newfs4
68309 41506  2706     0  D+      biowr   0xfffffe00022ca838  newfs4
68308 41506  2706     0  D+      biowr   0xfffffe0001543890  newfs4
68300     0     0     0  DL      newbuf  0xffffffff81a12af8  [md10]

https://people.freebsd.org/~pho/stress/log/newfs4-3.txt
https://people.freebsd.org/~pho/kernel+core.26.flix1.r344492.txz

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