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

--- Comment #1 from Kurt Jaeger <[email protected]> ---
(In reply to Kurt Jaeger from comment #0)
I created a ktrace:

ktrace -f /tmp/ktr3 df
kdump -f /tmp/ktr3 > df-ktrace

see:
https://people.freebsd.org/~pi/logs/hang/df-ktrace

It looks like the last sign of life are some calls to getfsstat() ?

 23969 df       RET   close 0
 23969 df       CALL  munmap(0x2c36300f000,0xcf44)
 23969 df       RET   munmap 0
 23969 df       CALL  ioctl(0x1,TIOCGETA,0x2c35fccf394)
 23969 df       RET   ioctl 0
 23969 df       CALL  getfsstat(0,0,MNT_NOWAIT)
 23969 df       RET   getfsstat 68/0x44
 23969 df       CALL  getfsstat(0xf7dddc4a580,0x4dd40,MNT_NOWAIT)
 23969 df       RET   getfsstat 67/0x43
 23969 df       CALL  getfsstat(0xf7dddc4a580,0x4dd40,MNT_WAIT)

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