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32 messages in net.sourceforge.lists.courier-maildrop[maildropl] Re: OpenBSD 3.2 breaks Co...| From | Sent On | Attachments |
|---|---|---|
| Sam Varshavchik | Jan 13, 2003 3:46 pm | |
| D. J. Bernstein | Jan 13, 2003 6:11 pm | |
| Sam Varshavchik | Jan 13, 2003 9:11 pm | |
| Russell Nelson | Jan 13, 2003 9:46 pm | |
| Sam Varshavchik | Jan 13, 2003 10:19 pm | |
| Russell Nelson | Jan 13, 2003 11:11 pm | |
| Sam Varshavchik | Jan 13, 2003 11:35 pm | |
| mw-l...@csi.hu | Jan 14, 2003 7:40 am | |
| Sam Varshavchik | Jan 14, 2003 3:22 pm | |
| mw-l...@csi.hu | Jan 14, 2003 11:13 pm | |
| Sam Varshavchik | Jan 15, 2003 5:11 am | |
| Matthias Andree | Jan 15, 2003 9:55 am | |
| Matthias Andree | Jan 15, 2003 12:59 pm | |
| Matthias Andree | Jan 15, 2003 1:36 pm | |
| Sam Varshavchik | Jan 15, 2003 3:11 pm | |
| Matthias Andree | Jan 15, 2003 4:13 pm | |
| Sam Varshavchik | Jan 15, 2003 4:47 pm | |
| Johan Lindh | Jan 15, 2003 10:16 pm | |
| Peter C. Norton | Jan 15, 2003 11:52 pm | |
| Bill Michell | Jan 16, 2003 1:30 am | |
| Johan Lindh | Jan 16, 2003 2:00 am | |
| Bill Michell | Jan 16, 2003 2:28 am | |
| Matthias Andree | Jan 16, 2003 2:28 am | |
| Matthias Andree | Jan 16, 2003 2:45 am | |
| David Laight | Jan 16, 2003 3:14 am | |
| Sam Varshavchik | Jan 16, 2003 5:01 am | |
| Johan Lindh | Jan 16, 2003 6:28 am | |
| Matthias Andree | Jan 16, 2003 9:47 am | |
| mw-l...@csi.hu | Jan 16, 2003 12:48 pm | |
| Sam Varshavchik | Jan 16, 2003 2:55 pm | |
| mw-l...@csi.hu | Jan 17, 2003 12:30 pm | |
| Matthias Andree | Jan 18, 2003 5:05 am |
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| Subject: | [maildropl] Re: OpenBSD 3.2 breaks Courier, Qmail. | Actions... |
|---|---|---|
| From: | Russell Nelson (nel...@crynwr.com) | |
| Date: | Jan 13, 2003 11:11:47 pm | |
| List: | net.sourceforge.lists.courier-maildrop | |
Click on this URL to check the validity of nel...@crynwr.com: http://q249.crynwr.com/nelson/1042528048.23966.63f797456aebb2fbab137777da5d7b5a
Sam Varshavchik writes:
Russell Nelson writes:
Sam Varshavchik writes:
Since filenames for messages in maildirs are generated based on the combination of the pid, and the current time, in seconds, there is now a race condition that will result in loss or corruption of mail. This breaks Courier and Qmail.
Not for qmail, it doesn't. In the unlikely event that corruption would occur, qmail-local sleeps two seconds and tries again. At that point, the pid is still the same and the time is different.
How exactly would qmail-local (which started at T+900 milliseconds) know that it needs to do that; when at T+700 milliseconds an app moved a file carrying the same filename from new to cur, and THAT file was delivered to new by another qmail-local process that had the same pid, but which exited at T+500 milliseconds?
Ahhhh, I see the problem. It's a definitional one, not a coding one. There's two things which are being assumed which are now seen to be not true. Various bits of code assume "that a file which is unique in one Maildir dir will be unique in all of them." Other bits of code assume that "No pid will be reused in the same second".
-- -russ nelson http://russnelson.com | You get prosperity when Crynwr sells support for free software | PGPok | the government does less, 521 Pleasant Valley Rd. | +1 315 268 1925 voice | not when the government Potsdam, NY 13676-3213 | +1 315 268 9201 FAX | does something right.