=== RUN DF-1843 2026-07-20T18:44:52Z ===
DF-1843: race confirmed — dmopen returned a handle into a freed dm_dev_t (is_open store at device-mapper.c:213 lost the race vs remove reading is_open at dm_ioctl.c:354).
Next dmstrategy (device-mapper.c:365) would dereference freed memory.
[exit=0]