No hang/failure in 250 test058 runs, on RE24 + master commit 9e6245f87e5d2fc0b0c52c7aacf5e5ccac115839 "ITS#7235 prevent sop from being freed during init".
Reproduced it *without* that commit after 70 runs on a busy host. Quite similar. http://folk.uio.no/hbf/its7235.testdir2.tgz has output, gdb trace and testrun/ if that is of any interest.
Both tested RE24 variants also have the latest other master fixes: ITS#7228, #7231, #7233, #7234.