BUG/MEDIUM: fd: Don't fd_stop_recv() a fd we don't own.
In fd_takeover(), if we failed to grab the fd, when a double-width
compare-and-swap is not implemented, do not call fd_stop_recv() on the
fd, it is not ours and may be used by another thread.
diff --git a/src/fd.c b/src/fd.c
index b0a1684..1fcf1d4 100644
--- a/src/fd.c
+++ b/src/fd.c
@@ -362,7 +362,8 @@
* the fd is polled by the thread that used to own it, the new thread
* is supposed to call subscribe() later, to activate polling.
*/
- fd_stop_recv(fd);
+ if (ret != -1)
+ fd_stop_recv(fd);
return ret;
#else
unsigned long old_masks[2];