Subject: [PATCH 2/2] man/send(2): document a long standing bug that can cause spurious EPERM errors

From: Fernando Luis Vázquez Cao <[email-masked]>
Date: Tue, 19 Mar 2013 15:52:40 +0900

Subject: [PATCH 2/2] man/send(2): document a long standing bug that can cause spurious EPERM errors

This bug has been known since early 2009 (the latest) and  discussed in
netdev before:

http://marc.info/?l=linux-netdev&w=2&r=1&s=Possible+race+condition+in+conntracking+&q=b

It seems that a proper fix would be non trivial, so document the bug
in the meantime.

Reported-by: Hirotaka Sasaki <[email-masked]>
Signed-off-by: Fernando Luis Vazquez Cao <[email-masked]>
---

diff -urNp man-pages-3.50-orig/man2/send.2 man-pages-3.50/man2/send.2
--- man-pages-3.50-orig/man2/send.2	2013-03-19 15:18:03.784306647 +0900
+++ man-pages-3.50/man2/send.2	2013-03-19 15:30:40.788060426 +0900
@@ -420,6 +420,11 @@ Linux may return
 .B EPIPE
 instead of
 .BR ENOTCONN .
+
+Linux may return spurious
+.B EPERM
+errors when netfilter's conntrack module is loaded and two or more
+UDP packets belonging to the same connection are processed in parallel.
 .SH EXAMPLE
 An example of the use of
 .BR sendto ()

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