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This question has been migrated from SO to SU. But it appears twice on SU: 201502 and 201503, both appear in listings.

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Similar issue that was marked [status-completed]: meta.stackexchange.com/questions/19299/… –  Pops Oct 20 '10 at 15:43
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2 Answers 2

up vote 4 down vote accepted

hmm, looks like a race condition on close. I cleaned up and we'll look into it.

edit: we identified a bug in our code that could allow this, and fixed it.

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Looks like a race condition to me.

migrated to superuser.com by John Rasch (1), Dustin Laine (2), Kibbee (3), ar (4), Shiraz Bhaiji (5), martin clayton (6) 25 mins ago

(emphasis mine)

Apparently you and Shiraz Bhaiji voted to close at exactly the same time, and the system migrated it twice in near-parallel.

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Good spot that. –  martin clayton Oct 20 '10 at 14:57
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Personally, I blame ar for sneaking in there with a two-letter username. –  Pops Oct 20 '10 at 15:02
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This has happened before. I recall one that got up to 14 close votes and 10(!) migrations. (Was probably a different cause, then, though.) –  Gnome Oct 20 '10 at 15:17
    
@Roger: Yeah, I remember that one too; thought about looking it up, but like you, I assumed it was a different cause. EDIT: Alright, here it is: meta.stackexchange.com/questions/51307/… –  Pops Oct 20 '10 at 15:40
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