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BUG/MAJOR: dns: Broken kqueue events handling (BSD systems).

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Some DNS related network sockets were closed without unregistering their file
descriptors from their underlying kqueue event sets. This patch replaces calls to
close() by fd_delete() calls to that to delete such events attached to DNS
network sockets from the kqueue before closing the sockets.

The bug was introduced by commit 26c6eb8 ("BUG/MAJOR: dns: restart sockets
after fork()") which was backported in 1.7 so this fix has to be backported
there as well.

Thanks to Jim Pingle who reported it and indicated the faulty commit, and
to Lukas Tribus for the trace showing the bad file descriptor.
This commit is contained in:
Frdric Lcaille 2017-05-12 09:57:15 +02:00 committed by Willy Tarreau
parent 047000a8bd
commit 64920538fc
1 changed files with 1 additions and 1 deletions
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2
src/dns.c
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@ -1004,7 +1004,7 @@ int dns_init_resolvers(int close_socket)
if (close_socket == 1) {
if (curnameserver->dgram) {
close(curnameserver->dgram->t.sock.fd);
fd_delete(curnameserver->dgram->t.sock.fd);
memset(curnameserver->dgram, '\0', sizeof(*dgram));
dgram = curnameserver->dgram;
}