$ vnconfig -c /dev/vn2 /root/mbr.img && sleep 1
$ timeout 58 ./poc2742 /dev/vn2 /dev/vn2s1 50
pread: Invalid argument
reader 0x1 did 88 reads
reader 0x3 did 71 reads
reader 0x5 did 120 reads
reader 0x2 did 3 reads
reader 0x7 did 66 reads
reader 0x4 did 196 reads
reader 0x0 did 241 reads
reader 0x6 did 123450 reads
did 660136 forced reprobes over 50s with 8 concurrent readers
RC=0
dmesg tail: repeated "vn2s1: cannot find label (no disk label)" per reprobe