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

[Loïc Hoguin]

On 10/15/2012 06:09 PM, Attila Rajmund Nohl wrote:
> 2012/10/15 Loïc Hoguin <essen@REDACTED>:
> [...]
>>> 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',26952275589898844250103204854000460899755240864557148991279029405309749386179997816352098133722767607711339559172144166023544257819579600281768301281374192936110073288270279982220728800798557215504319561694659173220853716332492625335748497090542115981135939145850167689577529567336032326581411005966667046488818079418004669621093520594249388264789813277716494693460309931110183497107534349074298533842111855672958994036657571757894555006279600552417098362361837531438833518633912632305124934722467790401548511827982945839067677876435394001531838872958423949934302335970305331259903589271491819721745867851063767101711,65537,72894561061836369429952440001397404435381791098810666626550009339627280447692213756327103684977349565388024121690992163627770872919426951949943259565185707278720577541631553578110444175680062658469881781442213382568569223796242089823480188432467004251893513795
29032795180763714863835283712338222389782464852044908949559099608779063302276133782734662944988246892889439189879440128304200546026414115176004328650285319262737051106741309180479178565669060188052206153201268137707738579437817066853295089724557953207910831295502502266942720391639060038564028714207644340973116764361586980768047522941109290140269958017673,175687943987452481712482925881452602286249755596049611520304319723586191396077353211979651292293422727226888628810410185730059847194115171473543563960899974179642474882228165413574970142069071147678024461620581964093179873537217082000749319715442644574561869121959620883833054096268955094522609955548334417459,153409932282113553454184543331491108535630917003675738115171976005561046830080906444372373873384261619709596605477733172587334100633359814892598660495299494503111498422936185897687222105679379604880102069501875829087474529350923531274442007552106843129760936560325773227109973336264866827986047857553670280629,1653778011280640103960
32533996867303777118782862747708688208092956158440780252498542811490728487320772469810738971008968489145399289747151126453392805772011338882217952599871103786463875892748648418527046734444999723398379211505851743415571090610985953725319559986129544296274474768880307859595812559810466567,99372239273086723091338362047522171285756194037567212940251777246259022537354389739788150444373539745180764989177727522509078951433348961072685633082784597107680994416138776015512122203187528006871997391618377904030112283443023112892909533616156365176077807633229316646127723088806569214057154029767435353361,7323400945433254897172443884831966307350890604864415567101495881249115607826271555845873590083141172347084964771961315371798965570031721570889013199060717814694355367862624287469661994309269724835502396215672690851146331180228281917872372949595188776597872289445053324786304898777105863585382475713592590505,asn1_NOVALUE},{'DHParameter',17976931348623159077083915679378745319786029604875601170644442368
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)

-- 
Loïc Hoguin
Erlang Cowboy
Nine Nines
http://ninenines.eu