inets crashing in R10B-6

Serge Aleynikov <>
Mon Jun 27 13:23:50 CEST 2005


 >cat /proc/version
Linux version 2.4.20 () (gcc version 2.96 
20000731 (Red Hat Linux 7.3 2.96-110)) #2 SMP Wed Jan 29 18:40:47 EST 2003

Regards,

Serge

UAB L/K Peter Andersson wrote:
> Hi Serge,
> 
> Yes, we've made some updates in both kernel and inets with regards to
> IPv6 handling. We had a resolver problem that could cause inets to
> believe IPv6 was working properly when, in fact, there was no support
> for IPv6 on the host.
> 
> The behaviour you get when starting inets looks bad. inets is supposed
> to be able to fall back to IPv4 if IPv6 is not working properly. For
> some reason, the fix we made seems to rather have introduced the problem
> on your system. Weird. We'll have to look into this promptly!
> 
> What OS are you using?
> 
> Best regards,
> Peppe
> 
> -----------------------
> Erlang/OTP, Ericsson AB
> -----------------------
> 
> Serge Aleynikov wrote:
> 
>>I set up a trace on gen_tcp:listen, and see that httpd is trying to bind
>>to inet6, which is indeed the root of this problem on this host:
>>
>>5> dbg:tracer().
>>{ok,<0.47.0>}
>>6> dbg:p(all,call).
>>{ok,[{,25}]}
>>7> dbg:tpl(httpd_transport, listen, dbg:fun2ms(fun(_) -> return_trace()
>>end)).
>>{ok,[{,0},{saved,1}]}
>>8> dbg:tpl(gen_tcp, listen, dbg:fun2ms(fun(_) -> return_trace() end)).
>>
>>{ok,[{,1},{saved,1}]}
>>9> httpd:start_link(["../priv/inets.conf"]).
>>(<0.59.0>) call
>>gen_tcp:listen(8080,[inet6,{ip,any},{packet,0},{active,false},{backlog,128},{reuseaddr,true}])
>>(<0.59.0>) returned from gen_tcp:listen/2 -> {error,eafnosupport}
>>** exited: shutdown **
>>
>>How can I force httpd not to use inet6?  Did some default setting change
>>in R10B-6?  I see this statement in the release notes, but not sure if
>>it is related:
>>
>>   OTP-5576 When doing an inet6 name lookup on an IPv4 address it was
>>            possible to get an address on IPv4 format back. This has been
>>           corrected. Some other minor inconsistencies regarding IPv6
>>           name lookup have also been corrected.
>>
>>Thanks,
>>
>>Serge
>>
>>Serge Aleynikov wrote:
>>
>>>Hi,
>>>
>>>I upgraded Erlang to R10B-6 and for some reason inets keeps crashing at
>>>startup.  Before upgrading it worked under R10B-5 with no problems.
>>>
>>> >erl
>>>Erlang (BEAM) emulator version 5.4.8 [source] [hipe] [threads:0]
>>>
>>>Eshell V5.4.8  (abort with ^G)
>>>1>httpd:start_link(["../priv/inets.conf"]).
>>>
>>>=SUPERVISOR REPORT==== 24-Jun-2005::17:58:36 ===
>>>     Supervisor: {local,httpd_instance_sup_8080}
>>>     Context:    start_error
>>>     Reason:     {{listen,eafnosupport},
>>>                  {child,undefined,
>>>                         {httpd_acceptor,any,8080},
>>>                         {httpd_acceptor,
>>>                             start_link,
>>>                             [<0.66.0>,
>>>                              ip_comm,
>>>                              any,
>>>                              8080,
>>>                              httpd_conf_8080,
>>>                              silence]},
>>>                         permanent,
>>>                         1000,
>>>                         worker,
>>>                         [httpd_acceptor]}}
>>>...
>>>
>>>Here is the content of "../priv/inets.conf":
>>>------BEGIN---------
>>>BindAddress    *
>>>Port           8080
>>>ServerName     wwwproxy
>>>
>>>ServerRoot     ../priv
>>>DocumentRoot   ../priv/docroot
>>>Modules        mod_alias mod_auth mod_actions mod_include mod_dir
>>>mod_get mod_head
>>>
>>>DirectoryIndex index.html
>>>
>>>ErlScriptAlias /erl io io_lib server_mgr
>>>------END---------
>>>
>>>Any idea how to configure it in order to avoid this
>>>{listen,eafnosupport} "address family not supported by protocol family"
>>>error?
>>>
>>>Serge
>>>
>>
>>--
>>Serge Aleynikov
>>R&D Telecom, IDT Corp.
>>Tel: (973) 438-3436
>>Fax: (973) 438-1464
>>
> 
> 




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