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pcntl_fork causing “errno=32 Broken pipe” #474

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pcntl_fork causing “errno=32 Broken pipe”#474
@penfold45

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@penfold45
penfold45
opened on May 17, 2014

Hi

I am having issues with PHP notices after upgrading from php 5.4.26 to 5.4.28. I original thought it was a php issue but it may be related to this Redis extension.

The full details can be found here http://stackoverflow.com/questions/23713480/after-php-upgrade-pcntl-fork-causing-errno-32-broken-pipe

But basically when I am forking, whenever a child closes, except for the first child, I get an error saying:

Notice: Unknown: send of 6 bytes failed with errno=32 Broken pipe in Unknown on line 0

It feels like the first child is closing the connection to Redis and then the following children try and close the same connection.

It appears that this has only just started being an issue since either PHP 5.4.27 or 5.4.28

Could this be a phpredis issue?

I have Redis Version => 2.2.5 installed

Activity

michael-grunder

michael-grunder commented on May 19, 2014

@michael-grunder
michael-grunder
on May 19, 2014
Member

Hey there,

While I don't know specifically why, I have a strong suspicion that the Zend library might get a little quirky around sockets within the context of a forking. That being said, I'll see if I can replicate your issue based on the stack overflow question you mentioned.

Cheers dude,
Mike

penfold45

penfold45 commented on May 19, 2014

@penfold45
penfold45
on May 19, 2014
Author

Brilliant thanks. For the time being I have just disabled php notice errors for the scripts that fork. Makes my log files a little quieter ;)

penfold45

penfold45 commented on Jun 5, 2014

@penfold45
penfold45
on Jun 5, 2014
Author

Hi. I was woundering if you have had chance to look into this yet?

penfold45

penfold45 commented on Sep 30, 2014

@penfold45
penfold45
on Sep 30, 2014
Author

Bump*

jessem

jessem commented on Oct 29, 2014

@jessem
jessem
on Oct 29, 2014

+1 Also seeing this issue with workers that fork in PHPResque https://github.com/chrisboulton/php-resque

splitice

splitice commented on Nov 16, 2014

@splitice
splitice
on Nov 16, 2014

+1 also seeing this in php resque workers.

Appears harmless... guessing its "QUIT\r\n"

dominics
added a commit that references this issue on Nov 18, 2014

Disable phpredis

95e5f52
jat001

jat001 commented on Jan 12, 2015

@jat001
jat001
on Jan 12, 2015

I know how to fix this bug. Just close the connect to redis before pcntl_fork and re-connect to redis after pcntl_fork.

anton000

anton000 commented on Jan 21, 2015

@anton000
anton000
on Jan 21, 2015

no updates?

roeyb

roeyb commented on Feb 3, 2015

@roeyb
roeyb
on Feb 3, 2015

+1

kaminono

kaminono commented on Feb 11, 2015

@kaminono
kaminono
on Feb 11, 2015

+1

rlweb

rlweb commented on Feb 20, 2015

@rlweb
rlweb
on Feb 20, 2015

+1

schlaus

schlaus commented on Mar 20, 2015

@schlaus
schlaus
on Mar 20, 2015

+1

lexaurin

lexaurin commented on Mar 26, 2015

@lexaurin
lexaurin
on Mar 26, 2015 · edited by lexaurin

Same here. PHP 5.5.9, phpredis 2.2.7

Simple script to replicate this bug https://gist.github.com/lexaurin/8897f1be48b9e8747b7d/e8a5fcd750623b6fc250f9c529fc2e65cc55893a

Expected result:

bool(true)

Actual result:

bool(true)
PHP Notice:  Unknown: send of 6 bytes failed with errno=32 Broken pipe in Unknown on line 0

Notice: Unknown: send of 6 bytes failed with errno=32 Broken pipe in Unknown on line 0

PHP Notice:  Unknown: send of 6 bytes failed with errno=32 Broken pipe in Unknown on line 0

Notice: Unknown: send of 6 bytes failed with errno=32 Broken pipe in Unknown on line 0

Connections before script (lsof -i :6379):

COMMAND     PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
redis-ser 20319 root    4u  IPv4 10422993      0t0  TCP *:6379 (LISTEN)

Connections after first child forked:

COMMAND     PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
redis-ser 20319 root    4u  IPv4 10422993      0t0  TCP *:6379 (LISTEN)
redis-ser 20319 root    6u  IPv4 10446216      0t0  TCP config0.local:6379->config0.local:52050 (ESTABLISHED)
php       21993  lex    8u  IPv4 10446860      0t0  TCP config0.local:52050->config0.local:6379 (ESTABLISHED)
php       21994  lex    8u  IPv4 10446860      0t0  TCP config0.local:52050->config0.local:6379 (ESTABLISHED)

Connections after second child forked:

COMMAND     PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
redis-ser 20319 root    4u  IPv4 10422993      0t0  TCP *:6379 (LISTEN)
php       21993  lex    8u  IPv4 10446860      0t0  TCP config0.local:52050->config0.local:6379 (CLOSE_WAIT)
php       22020  lex    8u  IPv4 10446860      0t0  TCP config0.local:52050->config0.local:6379 (CLOSE_WAIT)

Connections after third child forked:

COMMAND     PID USER   FD   TYPE   DEVICE SIZE/OFF NODE NAME
redis-ser 20319 root    4u  IPv4 10422993      0t0  TCP *:6379 (LISTEN)

Note: Fact that child closes "both" connections at the end is right (since it shares file descriptor with parent).

lexaurin

lexaurin commented on Mar 26, 2015

@lexaurin
lexaurin
on Mar 26, 2015 · edited by lexaurin

Modified my gist a bit to see which process produces notice https://gist.github.com/lexaurin/8897f1be48b9e8747b7d/d46ccd5c2ffabb1c3a09118db80654cb382c6c96
and it's interesting - third child at the end and following children and then parent at the end.

My log:

bool(true)
Parent pid: 22968
Child pid: 22969
Child pid: 22971
Child pid: 22972
Error in PID 22972: Unknown: send of 6 bytes failed with errno=32 Broken pipe
Child pid: 22973
Error in PID 22973: Unknown: send of 6 bytes failed with errno=32 Broken pipe
Child pid: 22974
Error in PID 22974: Unknown: send of 6 bytes failed with errno=32 Broken pipe
Error in PID 22968: Unknown: send of 6 bytes failed with errno=32 Broken pipe

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          pcntl_fork causing “errno=32 Broken pipe” · Issue #474 · phpredis/phpredis