Re: Client crash making server crash
signature.asc Description: OpenPGP digital signature
Re: Client crash making server crash
The _data_ses_stop() suggests that a POE::Kernel instance is stopping. The
_dispatch_event()'s second parameter is undefined, suggesting that the
POE::Kernel instance that is stopping already doesn't exist.
You've used POE::Wheel::Run to fork off a new process, and I see you've called
POE::Kernel->run() in the child process. Did you call POE::Kernel->stop()
first, to clear out the copies of the parent process' sessions? Or at the very
least, POE::Kernel->has_forked()?
See perldoc POE::Kernel for more about its stop() and has_forked() methods.
I'll try to reproduce the conditions in your stack trace after work.
--
Rocco Caputo
On Aug 19, 2011, at 15:47, Eric Martel wrote:
>
> Still no luck with a snapshot taken from
> "http://poe.git.sourceforge.net/git/gitweb.cgi?p=poe/poe;a=snapshot;h=5b9429832974363f7b0d37590cd5a5b7fd941360;sf=tgz";
> a few minutes ago:
>
> <-- BEGIN TRACE -->
>
> Server error: 'please report this stacktrace to bug-...@rt.cpan.org at
> /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1013'
>
> Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x95377d0)',
> undef, 'POE::Kernel=ARRAY(0x95377d0)', '_stop', 8, 'ARRAY(0x95c19f8)',
> '/usr/lib/perl5/site_perl/5.10.1/POE/Resource/Sessions.pm', 571, undef, ...)
> called at /usr/lib/perl5/site_perl/5.10.1/POE/Resource/Sessions.pm line
> 568'
>
>
>
> Server error: ' POE::Kernel::_data_ses_stop('POE::Kernel=ARRAY(0x95377d0)',
> 'poste161-186-4e4ebc84-41d6-0002') called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Resource/Signals.pm line 507'
>
> Server error: '
> POE::Kernel::_data_sig_free_terminated_sessions('POE::Kernel=ARRAY(0x95377d0)')
> called at /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 974'
>
> Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x95377d0)',
> 'POE::Kernel=ARRAY(0x95377d0)', 'POE::Kernel=ARRAY(0x95377d0)', '_signal', 16,
> 'ARRAY(0x9e35f48)', '/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 635,
> undef,
> ...) called at /usr/lib/perl5/site_perl/5.10.1/POE/Resource/Events.pm line
> 315'
>
> Server error: '
> POE::Kernel::_data_ev_dispatch_due('POE::Kernel=ARRAY(0x95377d0)') called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Loop/Select.pm line 306'
>
> Server error: ' POE::Kernel::loop_do_timeslice('POE::Kernel=ARRAY(0x95377d0)')
> called at /usr/lib/perl5/site_perl/5.10.1/POE/Loop/Select.pm line 314'
>
> Server error: ' POE::Kernel::loop_run('POE::Kernel=ARRAY(0x95377d0)') called
> at
> /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1235'
>
> Server error: ' POE::Kernel::run('POE::Kernel') called at
> /usr/lib/perl5/site_perl/5.10.1/YASC/yascs.pm line 48'
>
> Server error: ' YASC::yascs::yascs(7895) called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Wheel/Run.pm line 472'
>
> Server error: ' eval {...} called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Wheel/Run.pm line 472'
>
> Server error: ' POE::Wheel::Run::new('POE::Wheel::Run', 'Program',
> 'CODE(0x9ccf030)', 'ProgramArgs', 'ARRAY(0x9e2cd38)', 'StdoutEvent',
> 'server_input', 'StderrEvent', 'server_stderr', ...) called at bin/yascm.pl
> line
> 125'
>
> Server error: ' main::start(undef, 'POE::Session=ARRAY(0x9df8260)',
> 'POE::Kernel=ARRAY(0x95377d0)', 'HASH(0x9df8200)', '_start',
> 'POE::Kernel=ARRAY(0x95377d0)', undef,
> '/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 1437, ...) called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Session.pm line 464'
>
> Server error: ' POE::Session::_invoke_state('POE::Session=ARRAY(0x9df8260)',
> 'POE::Kernel=ARRAY(0x95377d0)', '_start', 'ARRAY(0x95739d0)',
> '/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 1437, undef) called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1023'
>
> Server error: ' eval {...} called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1022'
>
> Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x95377d0)',
> 'POE::Session=ARRAY(0x9df8260)', undef, '_start', 4, 'ARRAY(0x95739d0)',
> '/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 1437, undef, ...) called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1434'
>
> Server error: ' POE::Kernel::session_alloc('POE::Kernel=ARRAY(0x95377d0)',
> 'POE::Session=ARRAY(0x9df8260)') called at
> /usr/lib/perl5/site_perl/5.10.1/POE/Session.pm line 192'
>
> Server error: ' POE::Session::try_alloc('POE::Session=ARRAY(0x9df8260)')
> called
> at /usr/lib/perl5/site_perl/5.10.1/POE/Session.pm line 373'
>
> Server error: ' POE::Session::create('POE::Session', 'inline_states',
> 'HASH(0x9df8050)') called at bin/yascm.pl line 82'
>
> Server error: ' main::yasc() called at bin/yascm.pl line 72'
>
> <-- END TRACE -->
>
>
>
> Le 2011-08-19 14:51, Rocco Caputo a écrit :
>> Hi, Eric. Can you attach the confess() stack trace? It confesses because
>> of an internal error somewhere. Release 1.312 adds a message to the
>> confess() askin
Re: Client crash making server crash
Also, I don't know if it's relevant, but I use POE::Filter::Block for the POE::Wheel::ReadWrite Filter. Le 2011-08-19 14:43, Eric Martel a écrit : > Hi folks, > > I'm quite new to POE. I wrote a server using POE::Wheel::SocketFactory and > handling clients with POE::Wheel::ReadWrite, and everything works fine but for > one thing: there are moments when a client and the server will cross-exchange > much data (that is, the client sends data to the server, which replies with > other data, an this multiple times until they are finished), and I happened to > notice that if the client is killed before the end, the server will die, which > is not what I want... > > The server crashes in Kernel.pm, at the line "confess unless defined > $session;" > (line 1012 as of v1.311) within _dispatch_event(). What I guess is happening > (but I may be wrong) is that a '$client_wheel->put($data)' is made before the > client is killed, and when POE tries to actually handle the put(), the client > wheel session is already no longer accessible, before any ErrorEvent handler > could be called. Am I right on this? > > I could not find any way I could prevent this, but surely there must be...? I > wonder if replacing the "confess" line by a simple "warn + return" (or the > like) > could do the trick? Any help would be greatly appreciated. > -- Eric Martel Québec (Québec) Canada Ce courriel est signé numériquement avec la clef suivante: This e-mail is digitally signed with the following key: ED3F191C (key://pgp.mit.edu, http://key.ericmartel.net/) Pour plus d'information: http://gpg.ericmartel.net/ For more info: http://www.gnupg.org/ <> signature.asc Description: OpenPGP digital signature
Re: Client crash making server crash
Still no luck with a snapshot taken from
"http://poe.git.sourceforge.net/git/gitweb.cgi?p=poe/poe;a=snapshot;h=5b9429832974363f7b0d37590cd5a5b7fd941360;sf=tgz";
a few minutes ago:
<-- BEGIN TRACE -->
Server error: 'please report this stacktrace to bug-...@rt.cpan.org at
/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1013'
Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x95377d0)',
undef, 'POE::Kernel=ARRAY(0x95377d0)', '_stop', 8, 'ARRAY(0x95c19f8)',
'/usr/lib/perl5/site_perl/5.10.1/POE/Resource/Sessions.pm', 571, undef, ...)
called at /usr/lib/perl5/site_perl/5.10.1/POE/Resource/Sessions.pm line
568'
Server error: ' POE::Kernel::_data_ses_stop('POE::Kernel=ARRAY(0x95377d0)',
'poste161-186-4e4ebc84-41d6-0002') called at
/usr/lib/perl5/site_perl/5.10.1/POE/Resource/Signals.pm line 507'
Server error: '
POE::Kernel::_data_sig_free_terminated_sessions('POE::Kernel=ARRAY(0x95377d0)')
called at /usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 974'
Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x95377d0)',
'POE::Kernel=ARRAY(0x95377d0)', 'POE::Kernel=ARRAY(0x95377d0)', '_signal', 16,
'ARRAY(0x9e35f48)', '/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 635, undef,
...) called at /usr/lib/perl5/site_perl/5.10.1/POE/Resource/Events.pm line 315'
Server error: '
POE::Kernel::_data_ev_dispatch_due('POE::Kernel=ARRAY(0x95377d0)') called at
/usr/lib/perl5/site_perl/5.10.1/POE/Loop/Select.pm line 306'
Server error: ' POE::Kernel::loop_do_timeslice('POE::Kernel=ARRAY(0x95377d0)')
called at /usr/lib/perl5/site_perl/5.10.1/POE/Loop/Select.pm line 314'
Server error: ' POE::Kernel::loop_run('POE::Kernel=ARRAY(0x95377d0)') called at
/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1235'
Server error: ' POE::Kernel::run('POE::Kernel') called at
/usr/lib/perl5/site_perl/5.10.1/YASC/yascs.pm line 48'
Server error: ' YASC::yascs::yascs(7895) called at
/usr/lib/perl5/site_perl/5.10.1/POE/Wheel/Run.pm line 472'
Server error: ' eval {...} called at
/usr/lib/perl5/site_perl/5.10.1/POE/Wheel/Run.pm line 472'
Server error: ' POE::Wheel::Run::new('POE::Wheel::Run', 'Program',
'CODE(0x9ccf030)', 'ProgramArgs', 'ARRAY(0x9e2cd38)', 'StdoutEvent',
'server_input', 'StderrEvent', 'server_stderr', ...) called at bin/yascm.pl line
125'
Server error: ' main::start(undef, 'POE::Session=ARRAY(0x9df8260)',
'POE::Kernel=ARRAY(0x95377d0)', 'HASH(0x9df8200)', '_start',
'POE::Kernel=ARRAY(0x95377d0)', undef,
'/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 1437, ...) called at
/usr/lib/perl5/site_perl/5.10.1/POE/Session.pm line 464'
Server error: ' POE::Session::_invoke_state('POE::Session=ARRAY(0x9df8260)',
'POE::Kernel=ARRAY(0x95377d0)', '_start', 'ARRAY(0x95739d0)',
'/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 1437, undef) called at
/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1023'
Server error: ' eval {...} called at
/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1022'
Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x95377d0)',
'POE::Session=ARRAY(0x9df8260)', undef, '_start', 4, 'ARRAY(0x95739d0)',
'/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm', 1437, undef, ...) called at
/usr/lib/perl5/site_perl/5.10.1/POE/Kernel.pm line 1434'
Server error: ' POE::Kernel::session_alloc('POE::Kernel=ARRAY(0x95377d0)',
'POE::Session=ARRAY(0x9df8260)') called at
/usr/lib/perl5/site_perl/5.10.1/POE/Session.pm line 192'
Server error: ' POE::Session::try_alloc('POE::Session=ARRAY(0x9df8260)') called
at /usr/lib/perl5/site_perl/5.10.1/POE/Session.pm line 373'
Server error: ' POE::Session::create('POE::Session', 'inline_states',
'HASH(0x9df8050)') called at bin/yascm.pl line 82'
Server error: ' main::yasc() called at bin/yascm.pl line 72'
<-- END TRACE -->
Le 2011-08-19 14:51, Rocco Caputo a écrit :
> Hi, Eric. Can you attach the confess() stack trace? It confesses because of
> an internal error somewhere. Release 1.312 adds a message to the confess()
> asking for the stack trace.
>
> If possible, could you also check against the development version in git? I
> found and fixed one cause for that confess() this week, but it's not released
> yet. I'll expedite the 1.313 release if it fixes your problem.
>
--
Eric Martel
Québec (Québec)
Canada
Ce courriel est signé numériquement avec la clef suivante:
This e-mail is digitally signed with the following key:
ED3F191C (key://pgp.mit.edu, http://key.ericmartel.net/)
Pour plus d'information: http://gpg.ericmartel.net/
For more info: http://www.gnupg.org/
<>
signature.asc
Description: OpenPGP digital signature
Re: Client crash making server crash
Here is the confess trace (the "Server error" parts are produced by my program
and should be ignored); I will check for the git version.
<-- BEGIN TRACE -->
Server error: ' at /usr/local/share/perl/5.10.1/POE/Kernel.pm line 1012'
Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x871a78)',
undef, 'POE::Kernel=ARRAY(0x871a78)', '_stop', 8, 'ARRAY(0x946a60)',
'/usr/local/share/perl/5.10.1/POE/Resource/Sessions.pm', 571, undef, ...) called
at /usr/local/share/perl/5.10.1/POE/Resource/Sessions.pm line 568'
Server error: ' POE::Kernel::_data_ses_stop('POE::Kernel=ARRAY(0x871a78)',
's9infectio.infectio.domain_rech.chuq.qc.ca-4e4d4bf6-0eff-...') called at
/usr/local/share/perl/5.10.1/POE/Resource/Signals.pm line 507'
Server error: '
POE::Kernel::_data_sig_free_terminated_sessions('POE::Kernel=ARRAY(0x871a78)')
called at /usr/local/share/perl/5.10.1/POE/Kernel.pm line 974'
Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x871a78)',
'POE::Kernel=ARRAY(0x871a78)', 'POE::Kernel=ARRAY(0x871a78)', '_signal', 16,
'ARRAY(0x16aa168)', '/usr/local/share/perl/5.10.1/POE/Kernel.pm', 635, undef,
...) called at /usr/local/share/perl/5.10.1/POE/Resource/Events.pm line 315'
Server error: '
POE::Kernel::_data_ev_dispatch_due('POE::Kernel=ARRAY(0x871a78)') called at
/usr/local/share/perl/5.10.1/POE/Loop/Select.pm line 306'
Server error: ' POE::Kernel::loop_do_timeslice('POE::Kernel=ARRAY(0x871a78)')
called at /usr/local/share/perl/5.10.1/POE/Loop/Select.pm line 314'
Server error: ' POE::Kernel::loop_run('POE::Kernel=ARRAY(0x871a78)') called at
/usr/local/share/perl/5.10.1/POE/Kernel.pm line 1210'
Server error: ' POE::Kernel::run('POE::Kernel') called at
/usr/local/share/perl/5.10.1/YASC/yascs.pm line 48'
Server error: ' YASC::yascs::yascs(7895) called at
/usr/local/share/perl/5.10.1/POE/Wheel/Run.pm line 473'
Server error: ' eval {...} called at
/usr/local/share/perl/5.10.1/POE/Wheel/Run.pm line 473'
Server error: ' POE::Wheel::Run::new('POE::Wheel::Run', 'Program',
'CODE(0x147d640)', 'ProgramArgs', 'ARRAY(0x16a80e0)', 'StdoutEvent',
'server_input', 'StderrEvent', 'server_stderr', ...) called at /sbin/yascm.pl
line 125'
Server error: ' main::start(undef, 'POE::Session=ARRAY(0x628af8)',
'POE::Kernel=ARRAY(0x871a78)', 'HASH(0x628a68)', '_start',
'POE::Kernel=ARRAY(0x871a78)', undef,
'/usr/local/share/perl/5.10.1/POE/Kernel.pm', 1413, ...) called at
/usr/local/share/perl/5.10.1/POE/Session.pm line 464'
Server error: ' POE::Session::_invoke_state('POE::Session=ARRAY(0x628af8)',
'POE::Kernel=ARRAY(0x871a78)', '_start', 'ARRAY(0x8cc6b0)',
'/usr/local/share/perl/5.10.1/POE/Kernel.pm', 1413, undef) called at
/usr/local/share/perl/5.10.1/POE/Kernel.pm line 1015'
Server error: ' eval {...} called at /usr/local/share/perl/5.10.1/POE/Kernel.pm
line 1014'
Server error: ' POE::Kernel::_dispatch_event('POE::Kernel=ARRAY(0x871a78)',
'POE::Session=ARRAY(0x628af8)', undef, '_start', 4, 'ARRAY(0x8cc6b0)',
'/usr/local/share/perl/5.10.1/POE/Kernel.pm', 1413, undef, ...) called at
/usr/local/share/perl/5.10.1/POE/Kernel.pm line 1410'
Server error: ' POE::Kernel::session_alloc('POE::Kernel=ARRAY(0x871a78)',
'POE::Session=ARRAY(0x628af8)') called at
/usr/local/share/perl/5.10.1/POE/Session.pm line 192'
Server error: ' POE::Session::try_alloc('POE::Session=ARRAY(0x628af8)') called
at /usr/local/share/perl/5.10.1/POE/Session.pm line 373'
Server error: ' POE::Session::create('POE::Session', 'inline_states',
'HASH(0x62)') called at /sbin/yascm.pl line 82'
Server error: ' main::yasc() called at /sbin/yascm.pl line 72'
<-- END TRACE -->
Le 2011-08-19 14:51, Rocco Caputo a écrit :
> Hi, Eric. Can you attach the confess() stack trace? It confesses because of
> an internal error somewhere. Release 1.312 adds a message to the confess()
> asking for the stack trace.
>
> If possible, could you also check against the development version in git? I
> found and fixed one cause for that confess() this week, but it's not released
> yet. I'll expedite the 1.313 release if it fixes your problem.
>
--
Eric Martel
Québec (Québec)
Canada
Ce courriel est signé numériquement avec la clef suivante:
This e-mail is digitally signed with the following key:
ED3F191C (key://pgp.mit.edu, http://key.ericmartel.net/)
Pour plus d'information: http://gpg.ericmartel.net/
For more info: http://www.gnupg.org/
<>
signature.asc
Description: OpenPGP digital signature
Re: Client crash making server crash
Hi, Eric. Can you attach the confess() stack trace? It confesses because of an internal error somewhere. Release 1.312 adds a message to the confess() asking for the stack trace. If possible, could you also check against the development version in git? I found and fixed one cause for that confess() this week, but it's not released yet. I'll expedite the 1.313 release if it fixes your problem. -- Rocco Caputo On Aug 19, 2011, at 14:43, Eric Martel wrote: > Hi folks, > > I'm quite new to POE. I wrote a server using POE::Wheel::SocketFactory and > handling clients with POE::Wheel::ReadWrite, and everything works fine but for > one thing: there are moments when a client and the server will cross-exchange > much data (that is, the client sends data to the server, which replies with > other data, an this multiple times until they are finished), and I happened to > notice that if the client is killed before the end, the server will die, which > is not what I want... > > The server crashes in Kernel.pm, at the line "confess unless defined > $session;" > (line 1012 as of v1.311) within _dispatch_event(). What I guess is happening > (but I may be wrong) is that a '$client_wheel->put($data)' is made before the > client is killed, and when POE tries to actually handle the put(), the client > wheel session is already no longer accessible, before any ErrorEvent handler > could be called. Am I right on this? > > I could not find any way I could prevent this, but surely there must be...? I > wonder if replacing the "confess" line by a simple "warn + return" (or the > like) > could do the trick? Any help would be greatly appreciated. > > -- > Eric Martel > Québec (Québec) > Canada > > Ce courriel est signé numériquement avec la clef suivante: > This e-mail is digitally signed with the following key: > ED3F191C (key://pgp.mit.edu, http://key.ericmartel.net/) > Pour plus d'information: http://gpg.ericmartel.net/ > For more info: http://www.gnupg.org/ > > >
