[Bug 288345] poudriere run, hanging umounts, system fails to reboot due to hanging processes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288345

--- Comment #2 from Kurt Jaeger <pi@FreeBSD.org> ---
(In reply to Kurt Jaeger from comment #1)
  ktrace -f /tmp/ktr4 mount > mount-stdout
  kdump -f /tmp/ktr4 > mount-ktrace2

show that almost the same getfsstat() is made, but it leads to no hang:

 24159 mount    CALL  getfsstat(0,0,MNT_NOWAIT)
 24159 mount    RET   getfsstat 68/0x44
 24159 mount    CALL  getfsstat(0x3ae24724a840,0x4dd40,MNT_NOWAIT)
 24159 mount    RET   getfsstat 67/0x43
 24159 mount    CALL  fstat(0x1,0x1337f26aa7d0)
 24159 mount    STRU  struct stat {dev=3136594270542703103, ino=24217,
mode=0100664, nlink=1, uid=0, gid=0, rdev=0, atime=1753005689.619056000,
mtime=1753005689.619056000, ctime=1753005689.619056000,
birthtime=1753005689.619056000, size=0, blksize=131072, blocks=1, flags=0x800 }
 24159 mount    RET   fstat 0

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