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<  Yaws mailing list  ~  Yaws Server and the Process Dictionary
TrevorWoollacott
Posted: Mon Sep 14, 2009 3:09 pm Reply with quote
Joined: 27 Jul 2007 Posts: 8
Hi all,

I have setup an HTTPS server using Yaws-1.75 in Erlang R12-B5. While the clients are connected I'm seeing the following error every few seconds:
{{badmatch,undefined},[{proc_lib,exit_p,2}]}

I realise that this occurs in the following case (in R12-B5):
- A process is spawned using proc_lib:spawn_link,
- $initial_call is erased from the dictionary of that process,
- Then the process exits or crashes

When I check the dictionary of some of the Yaws Acceptors they are missing '$ancestors' and '$initial_call', as shown below (with the actual values removed by me):
dictionary: [
{gc, ...},
{init_db,[{gc, ...}]}]

However the other Acceptors still have $ancestors and $initial_call:
dictionary: [
{gc, ...},
{'$ancestors',[<5368.75.0>,yaws_server,yaws_sup,<5368.58.0>]},
{'$initial_call',{yaws_server,acceptor0,2}},
{init_db,[{gc, ...},
{'$ancestors',[<5368.75.0>,yaws_server,yaws_sup,<5368.58.0>]},
{'$initial_call',{yaws_server,acceptor0,2}]}]

So I assume that when the Yaws Acceptor exits normally, proc_lib:exit_p/2 crashes when it tries to match {m, f, a} with the value in '$initial_call'.

Has anyone seen this occur before with Yaws?

Thanks,
Trevor

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Guest
Posted: Wed Sep 16, 2009 10:32 am Reply with quote
Guest
Trevor Woollacott [ MTN - Innovation Centre ] wrote:
> Hi all,
>
> I have setup an HTTPS server using Yaws-1.75

1.75 is pretty old, and Yaws is using the proc dict in
fairly ugly ways. I think that you're seeing old (fixed) bugs
in how the proc dict is handled by Yaws.

Maybe

- proc dict/proc_lib patch by Magnus F (in 1.7Cool


is the fix.

/klacke

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TrevorWoollacott
Posted: Wed Sep 16, 2009 11:09 am Reply with quote
Joined: 27 Jul 2007 Posts: 8
> From: Claes Wikstr
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