gun_http:timeout/3 not exported/existent

[humaite]

One of our server is randomly reporting this kind of issues when some servers are very long to answer:

2025-08-11T04:28:40.960219+00:00 [error] supervisor:do_restart/3:759 Supervisor: {local,gun_conns_sup}. Context: child_terminated. Reason: {undef,[{gun_http,timeout,[{http_state,#Port<0.30942910>,gun_tcp,#{keepalive => 60000,closing_timeout => 15000},'HTTP/1.1',keepalive,<<>>,undefined,[],head,{0,0},head},inet,#Ref<0.3105060779.3738173442.127861>],[]},{gun,handle_common_connected,4,[{file,"_build/default/lib/gun/src/gun.erl"},{line,1568}]},{gen_statem,loop_state_callback,11,[{file,"gen_statem.erl"},{line,1395}]},{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,241}]}]}. Offender: id=gun,pid=<0.149597770.0>.

The line impacted is:

handle_common_connected(info, {timeout, TRef, Name}, _,
                State=#state{protocol=Protocol, protocol_state=ProtoState}) ->
        Commands = Protocol:timeout(ProtoState, Name, TRef),
        commands(Commands, State);

It seems gun_http:timeout/3 function was not created nor exported, then, this piece of code is crashing.

[essen]

gun_http normally does not start a timeout that's why it's not implemented.

The crash log says the timeout Name is inet which hints at a message leak from Erlang/OTP. I would suggest checking what OTP version you are using and seeing if upgrading to a more recent version helps.

https://github.com/erlang/otp/blob/f8f446d03972db8b61a610637e9427f53e8a9b4c/lib/kernel/src/inet.erl#L4666 is the line likely to start this timer. Perhaps host name resolution or TCP connect doesn't properly clean up after itself considering the callers of this function. Perhaps there's a crash (catched by Gun) preventing clean up.