[erlang-bugs] [erlang-questions] Process/FD leak in SSL R15B01

Ingela Anderton Andin <>
Wed Oct 17 09:51:45 CEST 2012


Hi!

My problem goes away with the following patch

diff --git a/lib/ssl/src/ssl.erl b/lib/ssl/src/ssl.erl
index 7788f75..771bfa5 100644
--- a/lib/ssl/src/ssl.erl
+++ b/lib/ssl/src/ssl.erl
@@ -869,10 +869,10 @@ internal_inet_values() ->

 socket_options(InetValues) ->
     #socket_options{
-               mode   = proplists:get_value(mode, InetValues),
-               header = proplists:get_value(header, InetValues),
-               active = proplists:get_value(active, InetValues),
-               packet = proplists:get_value(packet, InetValues),
+               mode   = proplists:get_value(mode, InetValues, lists),
+               header = proplists:get_value(header, InetValues, 0),
+               active = proplists:get_value(active, InetValues, active),
+               packet = proplists:get_value(packet, InetValues, 0),
                packet_size = proplists:get_value(packet_size, InetValues)
               }.


e.i.  default values where not properly handled.  I know to  little 
about  your configuration to say if  this is your problem too.  If not 
it would be great if you could
give me a way to recreate your problem.

Regards Ingela Erlang/OTP team - Ericsson AB


Ingela Anderton Andin wrote:
> Hi!
>
> This is puzzling. Links seems to be intact. And the supervisor should 
> have killed the gen_fsm-process if it gets stuck in terminate.
>
> I tried to recreate your problem, I did get a process leak problem, 
> however it did not manifest itself in quite the same way as yours.
>
> In my case I have an active process that seems to not have received 
> the tcp_close message. The fsm procss emulates active option as it 
> uses active once to receive TLS packets. If I set the active option 
> the process will terminate. At the moment I am have not found the root 
> of why it is not working as expected e.i. if it is the emulating code 
> that does something wrong or it perhaps is the inet driver.  Will have 
> to keep digging.
>
> Regards Ingela Erlang/OTP team - Ericsson AB
>
>
> Loïc Hoguin wrote:
>> 103> erlang:port_info(Port).
>> [{name,"tcp_inet"},
>>  {links,[<0.18199.1670>]},
>>  {id,51824890},
>>  {connected,<0.18199.1670>},
>>  {input,0},
>>  {output,3583}]
>> 104> Pid.
>> <0.18199.1670>
>>
>> On 10/16/2012 11:55 AM, Ingela Anderton Andin wrote:
>>> Hi!
>>>
>>> Ok, next question can you do a port_info on the linked port?
>>>
>>> Regards Ingela Erlang/OTP Team - Ericsson AB
>>>
>>> Loïc Hoguin wrote:
>>>> Hey,
>>>>
>>>> Here's one:
>>>>
>>>> [{current_function,{prim_inet,recv0,3}},
>>>>  {initial_call,{proc_lib,init_p,5}},
>>>>  {status,waiting},
>>>>  {message_queue_len,2},
>>>>  {messages,[{system,{<0.1523.2358>,#Ref<0.0.9161.247946>},
>>>>                     get_status},
>>>>             
>>>> {system,{<0.19941.2364>,#Ref<0.0.9166.119462>},get_status}]},
>>>>  {links,[<0.897.0>,#Port<0.51824890>]},
>>>>  {dictionary,[{ssl_manager,ssl_manager},
>>>>               {'$ancestors',[ssl_connection_sup,ssl_sup,<0.894.0>]},
>>>>               {'$initial_call',{ssl_connection,init,1}}]},
>>>>  {trap_exit,false},
>>>>  {error_handler,error_handler},
>>>>  {priority,normal},
>>>>  {group_leader,<0.893.0>},
>>>>  {total_heap_size,10946},
>>>>  {heap_size,4181},
>>>>  {stack_size,21},
>>>>  {reductions,8272},
>>>>  {garbage_collection,[{min_bin_vheap_size,46368},
>>>>                       {min_heap_size,233},
>>>>                       {fullsweep_after,10},
>>>>                       {minor_gcs,1}]},
>>>>  {suspending,[]}]
>>>>
>>>> The two get_status were me trying to inspect and getting a timeout.
>>>>
>>>> Will try commenting the function, that was my guess also. Doesn't
>>>> explain the other half of the processes though which still seem to be
>>>> running happily despite the process owning the socket being dead for
>>>> days.
>>>>
>>>> On 10/16/2012 11:18 AM, Ingela Anderton Andin wrote:
>>>>> Hi!
>>>>>
>>>>> This sounds really strange it would be interesting to see all
>>>>> process_info available for the process.
>>>>>
>>>>> Something you could try is to comment out the invocation of the 
>>>>> function
>>>>> workaround_transport_delivery_problems in the terminate function 
>>>>> of the
>>>>>   ssl_connection-process. This function can call recv(S, 0) and 
>>>>> sounds
>>>>> like the probable recv that hangs even though it should not.
>>>>>
>>>>> Regards Ingela Erlang/OTP team - Ericsson AB
>>>>>
>>>>>
>>>>> Loïc Hoguin wrote:
>>>>>> On 10/15/2012 06:09 PM, Attila Rajmund Nohl wrote:
>>>>>>> 2012/10/15 Loïc Hoguin <>:
>>>>>>> [...]
>>>>>>>>> lists:foldl(fun(X, Sum) -> case erlang:process_info(X) of
>>>>>>>>> undefined ->
>>>>>>>>> Sum; [{current_function, XXX}|_] -> case lists:keyfind(XXX, 1, 
>>>>>>>>> Sum)
>>>>>>>>> of false
>>>>>>>>> -> Curr = 0; {_, Curr} -> ok end, lists:keystore(XXX, 1, Sum, 
>>>>>>>>> {XXX,
>>>>>>>>> Curr +
>>>>>>>>> 1}) end end, [], List).
>>>>>>>> [{{prim_inet,recv0,3},25856},{{gen_fsm,loop,7},26574}]
>>>>>>>>
>>>>>>>> Not sure which one is the ESTABLISHED list and which one is the
>>>>>>>> FIN_WAIT2.
>>>>>>>> Of course, I can't use sys:get_status/1 on the PIDs stuck in
>>>>>>>> prim_inet:recv0/3 because the receive there is quite specific. 
>>>>>>>> So I
>>>>>>>> can't
>>>>>>>> get the stacktrace. The other case doesn't seem to give anything
>>>>>>>> useful (for
>>>>>>>> my level of knowledge, anyway).
>>>>>>>
>>>>>>> You can get the stacktrace with erlang:process_info(Pid, 
>>>>>>> backtrace).
>>>>>>
>>>>>> Thanks for the tip!
>>>>>>
>>>>>> So yeah, this one is stuck while trying to terminate.
>>>>>>
>>>>>> Program counter: 0x00007f05fd6a5608 (prim_inet:recv0/3 + 224)
>>>>>> CP: 0x0000000000000000 (invalid)
>>>>>> arity = 0
>>>>>>
>>>>>> 0x00007f052e1b1eb0 Return addr 0x00007f05a3248a98
>>>>>> (ssl_connection:terminate/3 + 800)
>>>>>> y(0)     57928
>>>>>> y(1)     #Port<0.51824890>
>>>>>>
>>>>>> 0x00007f052e1b1ec8 Return addr 0x00007f05a3b29670 
>>>>>> (gen_fsm:terminate/7
>>>>>> + 168)
>>>>>> y(0)     []
>>>>>> y(1)     []
>>>>>> y(2)     []
>>>>>> y(3)     []
>>>>>> y(4)     #Port<0.51824890>
>>>>>> y(5)     gen_tcp
>>>>>>
>>>>>> 0x00007f052e1b1f00 Return addr 0x00007f05a3bb41d0
>>>>>> (proc_lib:init_p_do_apply/3 + 56)
>>>>>> y(0)     []
>>>>>> y(1)
>>>>>> {state,server,{#Ref<0.0.8553.184512>,<0.18913.1670>},gen_tcp,tcp,tcp_closed,tcp_error,"localhost",8443,#Port<0.51824890>,{ssl_options,[],verify_none,{#Fun<ssl.1.54384637>,[]},false,false,undefined,1,"/home/obfuscated/obfuscatedrlang/lib/obfuscatedunchat-1.6.0/priv/ssl/cert.pem",undefined,"/home/obfuscated/obfuscatedrlang/lib/obfuscatedunchat-1.6.0/priv/ssl/cert.pem",undefined,undefined,undefined,"/home/obfuscated/obfuscatedrlang/lib/obfuscatedunchat-1.6.0/priv/ssl/cacert.pem",undefined,undefined,[<<2 
>>>>>>
>>>>>>
>>>>>> bytes>>,<<2 bytes>>,<<2 bytes>>,<<2 bytes>>,<<2 bytes>>,<<2
>>>>>> bytes>>,<<2 bytes>>,<<2 bytes>>,<<2 bytes>>,<<2 bytes>>,<<2
>>>>>> bytes>>,<<2 bytes>>,<<2
>>>>>> bytes>>],#Fun<ssl.0.54384637>,true,268435456,false,[],undefined,false},{socket_options,binary,0,0,0,once},{connection_states,{connection_state,{security_parameters,<<2 
>>>>>>
>>>>>>
>>>>>> bytes>>,0,7,1,16,128,16,unknown,2,20,0,<<48 bytes>>,<<32 
>>>>>> bytes>>,<<32
>>>>>> bytes>>,undefined},undefined,{cipher_state,<<16 bytes>>,<<16
>>>>>> bytes>>,undefined},<<20 bytes>>,6,true,<<12 bytes>>,<<12
>>>>>> bytes>>},{connection_state,{security_parameters,undefined,0,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,<<32 
>>>>>>
>>>>>>
>>>>>> bytes>>,undefined},undefined,undefined,undefined,undefined,true,undefined,undefined},{connection_state,{security_parameters,<<2 
>>>>>>
>>>>>>
>>>>>> bytes>>,0,7,1,16,128,16,unknown,2,20,0,<<48 bytes>>,<<32 
>>>>>> bytes>>,<<32
>>>>>> bytes>>,undefined},undefined,{cipher_state,<<16 bytes>>,<<16
>>>>>> bytes>>,undefined},<<20 bytes>>,13,true,<<12 bytes>>,<<12
>>>>>> bytes>>},{connection_state,{security_parameters,undefined,0,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,<<32 
>>>>>>
>>>>>>
>>>>>> bytes>>,undefined},undefined,undefined,undefined,undefined,true,undefined,undefined}},[],<<0 
>>>>>>
>>>>>>
>>>>>> bytes>>,<<0 bytes>>,{<<0 bytes>>,<<0 bytes>>},[],12308,{session,<<32
>>>>>> bytes>>,undefined,<<1257 bytes>>,0,<<2 bytes>>,<<48
>>>>>> bytes>>,true,63517514196},24599,ssl_session_cache,{3,1},undefined,false,rsa,undefined,{'RSAPrivateKey','two-prime',26952275589898844250103204854000460899755240864557148991279029405309749386179997816352098133722767607711339559172144166023544257819579600281768301281374192936110073288270279982220728800798557215504319561694659173220853716332492625335748497090542115981135939145850167689577529567336032326581411005966667046488818079418004669621093520594249388264789813277716494693460309931110183497107534349074298533842111855672958994036657571757894555006279600552417098362361837531438833518633912632305124934722467790401548511827982945839067677876435394001531838872958423949934302335970305331259903589271491819721745867851063767101711,65537,72894561061836369429952440001397404435381791098810666626550009339627280447692213756327103684977349565388024121690992163627770872919426951949943259565185707278720577541631553578110444175680062658469881781442213382568569223796242089823480188432467 
>>>>>>
> 00
>>>>>>
>>>>>>
>>> 42
>>>>>>
>>>>>>
>>>>> 51893513795
>>>>>>
>>>>>> 29032795180763714863835283712338222389782464852044908949559099608779063302276133782734662944988246892889439189879440128304200546026414115176004328650285319262737051106741309180479178565669060188052206153201268137707738579437817066853295089724557953207910831295502502266942720391639060038564028714207644340973116764361586980768047522941109290140269958017673,175687943987452481712482925881452602286249755596049611520304319723586191396077353211979651292293422727226888628810410185730059847194115171473543563960899974179642474882228165413574970142069071147678024461620581964093179873537217082000749319715442644574561869121959620883833054096268955094522609955548334417459,153409932282113553454184543331491108535630917003675738115171976005561046830080906444372373873384261619709596605477733172587334100633359814892598660495299494503111498422936185897687222105679379604880102069501875829087474529350923531274442007552106843129760936560325773227109973336264866827986047857553670280629,1653778 
>>>>>>
> 01
>>>>>>
>>>>>>
>>> 12
>>>>>>
>>>>>>
>>>>> 80640103960
>>>>>>
>>>>>> 32533996867303777118782862747708688208092956158440780252498542811490728487320772469810738971008968489145399289747151126453392805772011338882217952599871103786463875892748648418527046734444999723398379211505851743415571090610985953725319559986129544296274474768880307859595812559810466567,99372239273086723091338362047522171285756194037567212940251777246259022537354389739788150444373539745180764989177727522509078951433348961072685633082784597107680994416138776015512122203187528006871997391618377904030112283443023112892909533616156365176077807633229316646127723088806569214057154029767435353361,7323400945433254897172443884831966307350890604864415567101495881249115607826271555845873590083141172347084964771961315371798965570031721570889013199060717814694355367862624287469661994309269724835502396215672690851146331180228281917872372949595188776597872289445053324786304898777105863585382475713592590505,asn1_NOVALUE},{'DHParameter',17976931348623159077083915679378745319786029604875 
>>>>>>
> 60
>>>>>>
>>>>>>
>>> 11
>>>>>>
>>>>>>
>>>>> 70644442368
>>>>>>
>>>>>> 4197180216158519368947833795864925541502180565485980503646440548199239100050792877003355816639229553136239076508735759914822574862575007425302077447712589550957937778424442426617334727629299387668709205606050270810842907692932019128194467627007,2,asn1_NOVALUE},undefined,undefined,#Ref<0.0.0.13264>,{<0.1092.0>,#Ref<0.0.8553.179746>},0,<<0 
>>>>>>
>>>>>>
>>>>>> bytes>>,true,undefined,undefined,{[],[]},false,true}
>>>>>> y(2)     connection
>>>>>> y(3)     ssl_connection
>>>>>> y(4)     
>>>>>> {'DOWN',#Ref<0.0.8553.184512>,process,<0.18913.1670>,normal}
>>>>>> y(5)     <0.18199.1670>
>>>>>> y(6)     normal
>>>>>> y(7)     Catch 0x00007f05a3b29670 (gen_fsm:terminate/7 + 168)
>>>>>>
>>>>>> 0x00007f052e1b1f48 Return addr 0x0000000000883498 (<terminate 
>>>>>> process
>>>>>> normally>)
>>>>>> y(0)     Catch 0x00007f05a3bb41f0 (proc_lib:init_p_do_apply/3 + 88)
>>>>>>
>>>>>
>>>>
>>>>
>>>
>>
>>
>
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