I'm attempting to spawn long running processes using PoCo::Generic.
Sometimes the processes run and sometimes they immediately stop and fail
(like the trace shown below). What can cause these wheel read errors and
what is the best way to clean each process up after it has finished?
I've turned trace and debug on and I notice that I'm constantly getting read
errors on the wheel that exit with status 0 or status 13. I added some
dumper values to show the state of $self (Generic.pm line 685 _wheel_err and
Generic line 711 _child) when the errors happen.
pid 19826 STDERR: 29: alias is 29 at
Test/Debug_Modules/POE/Component/Generic.pm line 216.
pid 19826 STDERR: 29: Ask to create object at
Test/Debug_Modules/POE/Component/Generic.pm line 280.
pid 19826 STDERR: 29: session 14 created for Jnms::Router::Sender at
Test/Debug_Modules/POE/Component/Generic.pm line 53.
pid 19826 STDERR: 29: autoload method create_message at
Test/Debug_Modules/POE/Component/Generic.pm line 883.
pid 19826 STDERR: 29: 19826: processing request create_message
pid 19826 STDERR: 29: request put at
Test/Debug_Modules/POE/Component/Generic.pm line 434.
pid 19826 STDERR: 29:ERR: Setting debug=1 at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
321.
pid 19826 STDERR: 29:ERR: Setting verbose=1 at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
321.
pid 19826 STDERR: 29:ERR: build object Jnms::Router::Sender at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
324.
pid 19826 STDERR: 29:ERR: Child PID is 21187
pid 19826 STDERR: 29:ERR: object=Jnms::Router::Sender=HASH(0x423a628) at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
329.
pid 19826 STDERR: 29:ERR: reply
pid 19826 STDERR: 29:ERR: method=create_message at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
141.
pid 19826 STDERR: 29:ERR: Calling create_message on
Jnms::Router::Sender=HASH(0x423a628) at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
185.
pid 19826 STDERR: 29: __wheel_out at
Test/Debug_Modules/POE/Component/Generic.pm line 656.
pid 19826 STDERR: 29: Child PID=21187 at
Test/Debug_Modules/POE/Component/Generic.pm line 734.
pid 19826 STDERR: 29: __wheel_out at
Test/Debug_Modules/POE/Component/Generic.pm line 656.
pid 19826 STDERR: 29: (19826) Reply to 4/send_message at
Test/Debug_Modules/POE/Component/Generic.pm line 787.
pid 19826 STDERR: 29: autoload method send at
Test/Debug_Modules/POE/Component/Generic.pm line 883.
pid 19826 STDERR: 29: 19826: processing request send
pid 19826 STDERR: 29: request put at
Test/Debug_Modules/POE/Component/Generic.pm line 434.
pid 19826 STDERR: 29:ERR: reply
pid 19826 STDERR: 29:ERR: read
pid 19826 STDERR: 29:ERR: request
pid 19826 STDERR: 29:ERR: method=send at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
141.
pid 19826 STDERR: 29:ERR: Calling send on
Jnms::Router::Sender=HASH(0x423a628) at
/usr/local/lib/perl5/site_perl/5.10.0/POE/Component/Generic/Child.pm line
185.
# In Generic line 685 print STDERR "WHEEL ERROR" . Dumper($self, $operation,
$errnum, $errstr, $wheel_id);
pid 19826 STDERR: WHEEL ERROR $VAR1 = bless( {
pid 19826 STDERR: 'child_PID' => 21187,
pid 19826 STDERR: 'verbose' => 1,
pid 19826 STDERR: 'session_id' => 14,
pid 19826 STDERR: 'referenced' => 1,
pid 19826 STDERR: 'object_options' => [
pid 19826 STDERR: 'automation',
pid 19826 STDERR: 1
pid 19826 STDERR: ],
pid 19826 STDERR: 'debug' => 1,
pid 19826 STDERR: 'store' => {
pid 19826 STDERR: 'REQ000001' => {
pid 19826 STDERR: 'wantarray'
=> 0,
pid 19826 STDERR: 'session'
=> 4,
pid 19826 STDERR: 'event' =>
'executor_return',
pid 19826 STDERR: 'alias' =>
'29',
pid 19826 STDERR: 'package'
=> 'Jnms::Router::Sender'
pid 19826 STDERR: }
pid 19826 STDERR: },
pid 19826 STDERR: 'name' => '29',
pid 19826 STDERR: 'RID' => 'REQ000002',
pid 19826 STDERR: 'callback_map' => {
pid 19826 STDERR:
'Jnms::Router::Sender' => {}
pid 19826 STDERR: },
pid 19826 STDERR: 'package' => 'Jnms::Router::Sender',
pid 19826 STDERR: 'factory_map' => {},
pid 19826 STDERR: 'postback_map' => {
pid 19826 STDERR:
'Jnms::Router::Sender' => {}
pid 19826 STDERR: },
pid 19826 STDERR: 'callback_defs' => {},
pid 19826 STDERR: 'package_map' => {
pid 19826 STDERR:
'Jnms::Automation::Activate' => {
pid 19826 STDERR:
'initialize' => 'Jnms::Automation::Manager',
pid 19826 STDERR:
'start' => 'Jnms::Automation::Activate'
pid 19826 STDERR:
},
pid 19826 STDERR: 'Jnms::Router::Sender'
=> {
pid 19826 STDERR:
'send' => 'Jnms::Router::Sender',
pid 19826 STDERR:
'create_message' => 'Jnms::Router::Sender',
pid 19826 STDERR:
'new' => 'Jnms::Router::Sender'
pid 19826 STDERR:
}
pid 19826 STDERR: },
pid 19826 STDERR: 'alias' => '29',
pid 19826 STDERR: 'wheel' => bless( [
pid 19826 STDERR: 11,
pid 19826 STDERR: '__wheel_err',
pid 19826 STDERR: '__wheel_close',
pid 19826 STDERR: sub { "DUMMY" },
pid 19826 STDERR: 21187,
pid 19826 STDERR: 'pipe',
pid 19826 STDERR: 2,
pid 19826 STDERR: 0,
pid 19826 STDERR: undef,
pid 19826 STDERR: \*Symbol::GEN37,
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR: sub {
"DUMMY" },
pid 19826 STDERR: sub {
"DUMMY" },
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Reference' ),
pid 19826 STDERR: bless( [
pid 19826 STDERR: [],
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: 65536,
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Driver::SysRW' ),
pid 19826 STDERR: undef,
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stdin',
pid 19826 STDERR: 0,
pid 19826 STDERR: $VAR1->{'wheel'}[9],
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR:
$VAR1->{'wheel'}[10][1],
pid 19826 STDERR:
$VAR1->{'wheel'}[10][2],
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Reference' ),
pid 19826 STDERR: $VAR1->{'wheel'}[11],
pid 19826 STDERR: '__wheel_out',
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stdout',
pid 19826 STDERR: \*Symbol::GEN39,
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR:
'(\\x0D\\x0A?|\\x0A\\x0D?)',
pid 19826 STDERR: '
pid 19826 STDERR: ',
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Line' ),
pid 19826 STDERR: bless( [
pid 19826 STDERR: [],
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: 65536,
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Driver::SysRW' ),
pid 19826 STDERR: '__wheel_stderr',
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stderr',
pid 19826 STDERR: undef
pid 19826 STDERR: ], 'POE::Wheel::Run' )
pid 19826 STDERR: }, 'POE::Component::Generic' );
pid 19826 STDERR: $VAR2 = 'read';
pid 19826 STDERR: $VAR3 = '0';
pid 19826 STDERR: $VAR4 = '';
pid 19826 STDERR: $VAR5 = 11;
pid 19826 STDERR: 29: Wheel 11 generated read error 0:
# See this message twice at Generic line 685 print STDERR "WHEEL ERROR" .
Dumper($self, $operation, $errnum, $errstr, $wheel_id);
pid 19826 STDERR: WHEEL ERROR$VAR1 = bless( {
pid 19826 STDERR: 'child_PID' => 21187,
pid 19826 STDERR: 'verbose' => 1,
pid 19826 STDERR: 'session_id' => 14,
pid 19826 STDERR: 'referenced' => 1,
pid 19826 STDERR: 'object_options' => [
pid 19826 STDERR: 'automation',
pid 19826 STDERR: 1
pid 19826 STDERR: ],
pid 19826 STDERR: 'debug' => 1,
pid 19826 STDERR: 'store' => {
pid 19826 STDERR: 'REQ000001' => {
pid 19826 STDERR: 'wantarray'
=> 0,
pid 19826 STDERR: 'session'
=> 4,
pid 19826 STDERR: 'event' =>
'executor_return',
pid 19826 STDERR: 'alias' =>
'29',
pid 19826 STDERR: 'package'
=> 'Jnms::Router::Sender'
pid 19826 STDERR: }
pid 19826 STDERR: },
pid 19826 STDERR: 'name' => '29',
pid 19826 STDERR: 'RID' => 'REQ000002',
pid 19826 STDERR: 'callback_map' => {
pid 19826 STDERR:
'Jnms::Router::Sender' => {}
pid 19826 STDERR: },
pid 19826 STDERR: 'package' => 'Jnms::Router::Sender',
pid 19826 STDERR: 'factory_map' => {},
pid 19826 STDERR: 'postback_map' => {
pid 19826 STDERR:
'Jnms::Router::Sender' => {}
pid 19826 STDERR: },
pid 19826 STDERR: 'callback_defs' => {},
pid 19826 STDERR: 'package_map' => {
pid 19826 STDERR:
'Jnms::Automation::Activate' => {
pid 19826 STDERR:
'initialize' => 'Jnms::Automation::Manager',
pid 19826 STDERR:
'start' => 'Jnms::Automation::Activate'
pid 19826 STDERR:
},
pid 19826 STDERR: 'Jnms::Router::Sender'
=> {
pid 19826 STDERR:
'send' => 'Jnms::Router::Sender',
pid 19826 STDERR:
'create_message' => 'Jnms::Router::Sender',
pid 19826 STDERR:
'new' => 'Jnms::Router::Sender'
pid 19826 STDERR:
}
pid 19826 STDERR: },
pid 19826 STDERR: 'alias' => '29',
pid 19826 STDERR: 'wheel' => bless( [
pid 19826 STDERR: 11,
pid 19826 STDERR: '__wheel_err',
pid 19826 STDERR: '__wheel_close',
pid 19826 STDERR: sub { "DUMMY" },
pid 19826 STDERR: 21187,
pid 19826 STDERR: 'pipe',
pid 19826 STDERR: 1,
pid 19826 STDERR: 0,
pid 19826 STDERR: undef,
pid 19826 STDERR: \*Symbol::GEN37,
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR: sub {
"DUMMY" },
pid 19826 STDERR: sub {
"DUMMY" },
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Reference' ),
pid 19826 STDERR: bless( [
pid 19826 STDERR: [],
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: 65536,
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Driver::SysRW' ),
pid 19826 STDERR: undef,
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stdin',
pid 19826 STDERR: 0,
pid 19826 STDERR: $VAR1->{'wheel'}[9],
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR:
$VAR1->{'wheel'}[10][1],
pid 19826 STDERR:
$VAR1->{'wheel'}[10][2],
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Reference' ),
pid 19826 STDERR: $VAR1->{'wheel'}[11],
pid 19826 STDERR: '__wheel_out',
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stdout',
pid 19826 STDERR: \*Symbol::GEN39,
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR:
'(\\x0D\\x0A?|\\x0A\\x0D?)',
pid 19826 STDERR: '
pid 19826 STDERR: ',
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Line' ),
pid 19826 STDERR: bless( [
pid 19826 STDERR: [],
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: 65536,
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Driver::SysRW' ),
pid 19826 STDERR: '__wheel_stderr',
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stderr',
pid 19826 STDERR: undef
pid 19826 STDERR: ], 'POE::Wheel::Run' )
pid 19826 STDERR: }, 'POE::Component::Generic' );
pid 19826 STDERR: $VAR2 = 'read';
pid 19826 STDERR: $VAR3 = '0';
pid 19826 STDERR: $VAR4 = '';
pid 19826 STDERR: $VAR5 = 11;
pid 19826 STDERR: 29: Wheel 11 generated read error 0:
pid 19826 STDERR: 29: Wheel closed
# print STDERR "DUMPING NOW" . Dumper($self, $name, $PID, $ret);
pid 19826 STDERR: DUMPING NOW$VAR1 = bless( {
pid 19826 STDERR: 'child_PID' => 21187,
pid 19826 STDERR: 'verbose' => 1,
pid 19826 STDERR: 'session_id' => 14,
pid 19826 STDERR: 'referenced' => 1,
pid 19826 STDERR: 'object_options' => [
pid 19826 STDERR: 'automation',
pid 19826 STDERR: 1
pid 19826 STDERR: ],
pid 19826 STDERR: 'close' => 1,
pid 19826 STDERR: 'debug' => 1,
pid 19826 STDERR: 'store' => {
pid 19826 STDERR: 'REQ000001' => {
pid 19826 STDERR: 'wantarray'
=> 0,
pid 19826 STDERR: 'session'
=> 4,
pid 19826 STDERR: 'event' =>
'executor_return',
pid 19826 STDERR: 'alias' =>
'29',
pid 19826 STDERR: 'package'
=> 'Jnms::Router::Sender'
pid 19826 STDERR: }
pid 19826 STDERR: },
pid 19826 STDERR: 'name' => '29',
pid 19826 STDERR: 'RID' => 'REQ000002',
pid 19826 STDERR: 'callback_map' => {
pid 19826 STDERR:
'Jnms::Router::Sender' => {}
pid 19826 STDERR: },
pid 19826 STDERR: 'package' => 'Jnms::Router::Sender',
pid 19826 STDERR: 'factory_map' => {},
pid 19826 STDERR: 'postback_map' => {
pid 19826 STDERR:
'Jnms::Router::Sender' => {}
pid 19826 STDERR: },
pid 19826 STDERR: 'callback_defs' => {},
pid 19826 STDERR: 'package_map' => {
pid 19826 STDERR:
'Jnms::Automation::Activate' => {
pid 19826 STDERR:
'initialize' => 'Jnms::Automation::Manager',
pid 19826 STDERR:
'start' => 'Jnms::Automation::Activate'
pid 19826 STDERR:
},
pid 19826 STDERR: 'Jnms::Router::Sender'
=> {
pid 19826 STDERR:
'send' => 'Jnms::Router::Sender',
pid 19826 STDERR:
'create_message' => 'Jnms::Router::Sender',
pid 19826 STDERR:
'new' => 'Jnms::Router::Sender'
pid 19826 STDERR:
}
pid 19826 STDERR: },
pid 19826 STDERR: 'alias' => '29',
pid 19826 STDERR: 'wheel' => bless( [
pid 19826 STDERR: 11,
pid 19826 STDERR: '__wheel_err',
pid 19826 STDERR: '__wheel_close',
pid 19826 STDERR: sub { "DUMMY" },
pid 19826 STDERR: 21187,
pid 19826 STDERR: 'pipe',
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: undef,
pid 19826 STDERR: \*Symbol::GEN37,
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR: sub {
"DUMMY" },
pid 19826 STDERR: sub {
"DUMMY" },
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Reference' ),
pid 19826 STDERR: bless( [
pid 19826 STDERR: [],
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: 65536,
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Driver::SysRW' ),
pid 19826 STDERR: undef,
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stdin',
pid 19826 STDERR: 0,
pid 19826 STDERR: $VAR1->{'wheel'}[9],
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR:
$VAR1->{'wheel'}[10][1],
pid 19826 STDERR:
$VAR1->{'wheel'}[10][2],
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Reference' ),
pid 19826 STDERR: $VAR1->{'wheel'}[11],
pid 19826 STDERR: '__wheel_out',
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stdout',
pid 19826 STDERR: \*Symbol::GEN39,
pid 19826 STDERR: bless( [
pid 19826 STDERR: '',
pid 19826 STDERR:
'(\\x0D\\x0A?|\\x0A\\x0D?)',
pid 19826 STDERR: '
pid 19826 STDERR: ',
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Filter::Line' ),
pid 19826 STDERR: bless( [
pid 19826 STDERR: [],
pid 19826 STDERR: 0,
pid 19826 STDERR: 0,
pid 19826 STDERR: 65536,
pid 19826 STDERR: 0
pid 19826 STDERR: ],
'POE::Driver::SysRW' ),
pid 19826 STDERR: '__wheel_stderr',
pid 19826 STDERR: 'POE::Wheel::Run(11)
-> select stderr',
pid 19826 STDERR: undef
pid 19826 STDERR: ], 'POE::Wheel::Run' )
pid 19826 STDERR: }, 'POE::Component::Generic' );
pid 19826 STDERR: $VAR2 = 'CHLD';
pid 19826 STDERR: $VAR3 = 21187;
pid 19826 STDERR: $VAR4 = '13';
pid 19826 STDERR: 29: Child 21187 exited with 13 at
Test/Debug_Modules/POE/Component/Generic.pm line 716.
pid 19826 STDERR: 29: _done at Test/Debug_Modules/POE/Component/Generic.pm
line 306.
pid 19826 STDERR: 29: drop wheel at
Test/Debug_Modules/POE/Component/Generic.pm line 311.
pid 19826 STDERR: 29: remove alias 29 at
Test/Debug_Modules/POE/Component/Generic.pm line 322.
pid 19826 STDERR: 29: _stop at Test/Debug_Modules/POE/Component/Generic.pm
line 296.
