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I just saw that this question was deleted just after 3 minutes of posting:

Somehow it has 4 delete votes while three should be enough to delete the post.

It gets weirder, see the revision list:

Deleted twice, in a difference of one second.

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@AnthonyGrist no it's not. –  Shadow Wizard Jun 26 '13 at 10:13
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Two people voting at the same time? –  ben is uǝq backwards Jun 26 '13 at 10:13
    
It was deleted twice! –  Shadow Wizard Jun 26 '13 at 10:14
    
@ShaWizDowArd How is (was) it not? The question was "Are 4 votes required to delete questions that have just been closed?" and the answer is "No, it only requires three votes unless it's a popular question." - an answer that can be found in the first answer to the question I flagged this as a duplicate of. –  Anthony Grist Jun 26 '13 at 10:23
    
@AnthonyGrist Yes, but in this case four votes were recorded, and it's deleted twice. It's a different issue. –  Rob W Jun 26 '13 at 10:24
    
@Anthony he found a bug, so better revise as a bug then close and forget about it. –  Shadow Wizard Jun 26 '13 at 10:24
    
@NullPointer by the way, off topic comment: your site appears to be dead. –  Shadow Wizard Jun 26 '13 at 10:25
    
@ShaWizDowArd thankyou .... i am aware about it ... i have changed hosting ... however error is quite dangerous :) –  NullPoiиteя Jun 26 '13 at 10:28
    
So maybe consider editing it out of your profiles until fixed? :) –  Shadow Wizard Jun 26 '13 at 10:33
    
@ShaWizDowArd good idea ty .... and how possible dup banner works i.stack.imgur.com/D07cg.png ? –  NullPoiиteя Jun 26 '13 at 10:35
    
@NullPoiиteя excellent question! The user has <3K rep so obviously can't cast close vote; there are no close votes. The only explanation is that when forming this exact type of comment the banner is auto added! Too bad I must go now (lunch time) this would make an excellent bug report. –  Shadow Wizard Jun 26 '13 at 10:37

1 Answer 1

As ben commented, probably simultaneous voting:

  1. deceze vote to delete.
  2. Nanne vote to delete.
  3. Mark Baker vote to delete, the internal process responsible for deleting the post is triggered.
  4. While that process is still running and before it set the proper internal flag as "deleted" so additional votes are blocked, Quentin cast his own delete vote. Votes count is >=3 so the process for deletion is triggered once again, anew.

The above pretty much explains what happened, waiting for a dev to confirm of course and hopefully fix though it's not a big deal. (post still deleted, no harm done, just weird display)

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Taken the question into account this seems like an Insta-Nuke so I bet many have placed their votes fast so the race-condition might have happened. BTW the messages are not wrong if the events occured this way. The system itself defines what is congruent and what not. –  hakre Jun 26 '13 at 10:34
    
@hakre not really race condition, the delete process was triggered twice that's clear from the revisions. Question is what caused the double deletion. –  Shadow Wizard Jun 26 '13 at 10:35
    
Well, that's not the question. A deletion is caused by votes as you may know. –  hakre Jun 26 '13 at 10:38

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