ERL-1242: inet driver can get stuck

[OTP-Maintainer]

Original reporter: massemanet
Affected version: Not Specified
Component: erts
Migrated from: https://bugs.erlang.org/browse/ERL-1242

---

Start two sockets and connect them.
{code:erlang}
{ok,S}=gen_sctp:open(6666).
gen_sctp:listen(S,true). {code}
{code:erlang}
{ok,C}=gen_sctp:open().
gen_sctp:connect(C,localhost,6666,[]). 
{code}
 

{{Loop over a call to recv (with timeout).}}
{code:erlang}
RECV = fun(G,Sck) -> io:fwrite("~p~n",[gen_sctp:recv(Sck,500)]),G(G,Sck)end.
Pid = spawn(fun() -> RECV(RECV,S) end).
{code}
Close the socket.
{code:erlang}
gen_sctp:close(S).{code}
 The socket and the recv process is now stuck forever.

 
{code:erlang}
process_info(Pid,current_function).
{current_function,\{prim_inet,recvfrom0,3}
{code}
 

[OTP-Maintainer]

ingela said:

Alas this is not a high priority for Ericsson, but we will try to find some time to look into it. Can not make any promises on when that will be though.  Any insights anyone might have on this issue are more than welcome.

[OTP-Maintainer]

massemanet said:

The same thing happens for UDP.

{code:erlang}
{ok,S} = gen_udp:open(4567,[{active,false}]).
RECV = fun(G,Sck) -> io:fwrite("~p~n",[gen_udp:recv(Sck,0,500)]),G(G,Sck)end.
Pid = spawn(fun()->RECV(RECV,S)end).
{code}
{code:erlang}
gen_udp:close(S).
process_info(Pid,current_function).
{code}

[OTP-Maintainer]

bmk said:

Hi,

The bug seems to be in the socket close. It does to inform those processes that have
ongoing requests towards the socket (port). Thereby leaving the process hanging.

This effects both udp and sctp since they share this code.

Regards,
     /BMK

[OTP-Maintainer]

bmk said:

Hi,

A 22.3 patch package, 22.3.4.1, containing a fix for this has been released.

Regards,
    /BMK

[OTP-Maintainer]

bmk said:

Hi,

A 23.0 patch package, 23.0.1, containing a fix for this has been released.

Regards,
     /BMK