Hello
I'm pulling a me-too, except that my experience was real world rather than academic. I just spent all night dealing with a RAID5 that lost two members. I had to bring in an older version of mdadm to bring up the array with --force, after my current version was segfaulting in a similar manner than dhatz has described.
mdadm version is 2.6.7 on Debian unstable -- same segfault behavior, but with a few additional errors related to a small amount of array corruption. An older version of mdadm brought it back up so that I could reconstruct and fsck.
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