commit ea48ddc9552ecfc73d3b2186c05ee15cd7cc361d Author: David Goulet dgoulet@torproject.org Date: Mon Feb 14 13:20:53 2022 -0500

dns: Do not trigger overload general on DNS timeout

This was missed in #40527 when the DNS timeout overload general signal was removed.

Closes #40564

Signed-off-by: David Goulet dgoulet@torproject.org --- changes/ticket40564 | 4 ++++ src/feature/relay/dns.c | 10 ---------- 2 files changed, 4 insertions(+), 10 deletions(-)

diff --git a/changes/ticket40564 b/changes/ticket40564 new file mode 100644 index 0000000000..2f805bdef5 --- /dev/null +++ b/changes/ticket40564 @@ -0,0 +1,4 @@ + o Major bugfixes (relay, overload): + - Do not trigger a general overload on DNS timeout. Even after fixing + 40527, some code remained that triggered the overload. Fixes bug 40564; + bugfix on 0.4.7.1-alpha. diff --git a/src/feature/relay/dns.c b/src/feature/relay/dns.c index c6e0439338..180f2cbdd1 100644 --- a/src/feature/relay/dns.c +++ b/src/feature/relay/dns.c @@ -1539,16 +1539,6 @@ evdns_callback(int result, char type, int count, int ttl, void *addresses,

tor_addr_make_unspec(&addr);

- /* Note down any DNS errors to the statistics module */ - if (result == DNS_ERR_TIMEOUT) { - /* libevent timed out while resolving a name. However, because libevent - * handles retries and timeouts internally, this means that all attempts of - * libevent timed out. If we wanted to get more granular information about - * individual libevent attempts, we would have to implement our own DNS - * timeout/retry logic */ - rep_hist_note_overload(OVERLOAD_GENERAL); - } - /* Keep track of whether IPv6 is working */ if (type == DNS_IPv6_AAAA) { if (result == DNS_ERR_TIMEOUT) {