On Mon, 19 Feb 2024 13:29:44 -0800 Clayton Craft <clay...@craftyguy.net> wrote:
> The conditions to trigger this aren't well understood by me... it seems to
> happen when we use dnsmasq's dbus interface to toggle filtering ("set_filter A
> bool"). But I've had trouble reproducing it manually. We hit it a lot when
> using
> a NetworkManager dispatcher script to apply filtering in dnsmasq
> conditionally.
Ok I've been able to reproduce this with a simple script that interacts with
dnsmasq over dbus. The CNAME lookup at the end hangs dnsmasq pretty consistently
on the second iteration on one device I have (OnePlus 6, aarch64 running
postmarketOS), and it does not trigger a hang on another aarch64 system I
have (same OS).
I also forgot to mention this earlier, but I'm using dnsmasq 2.90 :)
#!/bin/sh
dnsmasq -p 5353 --enable-dbus=uk.org.thekelleys.dnsmasq
trap cleanup SIGINT
cleanup () {
pkill -9 -f "dnsmasq -p 5353"
exit
}
while true; do
echo "Trying..."
busctl call uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq \
uk.org.thekelleys.dnsmasq \
SetFilterA b false
busctl call uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq \
uk.org.thekelleys.dnsmasq \
SetFilterAAAA b false
busctl call uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq \
uk.org.thekelleys.dnsmasq \
ClearCache
dig @127.0.0.1 -p 5353 +nocmd mirror.postmarketos.org cname +noall
+answer
echo "Done"
done
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