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* [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs
@ 2012-04-20 8:52 wfpeltz at yahoo dot de
2012-04-20 9:34 ` [Bug network/14001] " wfpeltz at yahoo dot de
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: wfpeltz at yahoo dot de @ 2012-04-20 8:52 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14001
Bug #: 14001
Summary: getaddrinfo sometimes slow in multithreaded programs
Product: glibc
Version: 2.15
Status: NEW
Severity: normal
Priority: P2
Component: network
AssignedTo: unassigned@sourceware.org
ReportedBy: wfpeltz@yahoo.de
Classification: Unclassified
Created attachment 6352
--> http://sourceware.org/bugzilla/attachment.cgi?id=6352
test program
If two or more threads invoke getaddrinfo for the same node at (about) the same
time, the program hangs for 5 seconds (Fedora 17 x64_64, glibc 2.15) or for an
integral multiple of 5 seconds (Fedora 16 x64_64, glibc 2.14) before delivering
the correct result.
I have attached a short test program. You can try something like this:
time ./getaddrinfo_test www.amazon.com
(Amazon is one of the "slowest" hosts under Fedora 16. It often hangs for 20 or
25 seconds.)
If you specify a second argument, the second thread invokes getaddrinfo with
that second argument as "node". If the two nodes differ, the program never
hangs.
The program also doesn't hang if the node is "localhost". Under Fedora 17, it
doesn't hang if it is executed for a second time with the same node shortly
after the first execution. But under Fedora 16 it hangs even in this case.
One program that is affected by this bug is Privoxy. It starts a new thread for
each request, and if someone opens a web page the browser sends many requests
to the proxy for all the elements on the web page which in most cases go to the
same server. It doesn't cache the result of getaddrinfo. (Should it? I don't
think so.)
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug network/14001] getaddrinfo sometimes slow in multithreaded programs
2012-04-20 8:52 [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs wfpeltz at yahoo dot de
@ 2012-04-20 9:34 ` wfpeltz at yahoo dot de
2012-04-20 10:54 ` wfpeltz at yahoo dot de
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: wfpeltz at yahoo dot de @ 2012-04-20 9:34 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14001
Winfried Peltz <wfpeltz at yahoo dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |wfpeltz at yahoo dot de
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* [Bug network/14001] getaddrinfo sometimes slow in multithreaded programs
2012-04-20 8:52 [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs wfpeltz at yahoo dot de
2012-04-20 9:34 ` [Bug network/14001] " wfpeltz at yahoo dot de
@ 2012-04-20 10:54 ` wfpeltz at yahoo dot de
2013-10-13 7:47 ` neleai at seznam dot cz
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: wfpeltz at yahoo dot de @ 2012-04-20 10:54 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14001
Winfried Peltz <wfpeltz at yahoo dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Attachment #6352|0 |1
is obsolete| |
--- Comment #1 from Winfried Peltz <wfpeltz at yahoo dot de> 2012-04-20 10:53:51 UTC ---
Created attachment 6353
--> http://sourceware.org/bugzilla/attachment.cgi?id=6353
new test program
Sorry, there was a bug in my first test program. It didn't work correctly with
2 arguments. But this changes nothing I wrote above.
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* [Bug network/14001] getaddrinfo sometimes slow in multithreaded programs
2012-04-20 8:52 [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs wfpeltz at yahoo dot de
2012-04-20 9:34 ` [Bug network/14001] " wfpeltz at yahoo dot de
2012-04-20 10:54 ` wfpeltz at yahoo dot de
@ 2013-10-13 7:47 ` neleai at seznam dot cz
2013-11-06 11:25 ` neleai at seznam dot cz
2014-06-25 11:14 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: neleai at seznam dot cz @ 2013-10-13 7:47 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14001
Ondrej Bilka <neleai at seznam dot cz> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |UNCONFIRMED
CC| |neleai at seznam dot cz
Ever confirmed|1 |0
--- Comment #2 from Ondrej Bilka <neleai at seznam dot cz> ---
I cannot replicate this issue on 2.17. Attached program has same latency as
without multiple threads.
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* [Bug network/14001] getaddrinfo sometimes slow in multithreaded programs
2012-04-20 8:52 [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs wfpeltz at yahoo dot de
` (2 preceding siblings ...)
2013-10-13 7:47 ` neleai at seznam dot cz
@ 2013-11-06 11:25 ` neleai at seznam dot cz
2014-06-25 11:14 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: neleai at seznam dot cz @ 2013-11-06 11:25 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14001
Ondrej Bilka <neleai at seznam dot cz> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |WORKSFORME
--- Comment #3 from Ondrej Bilka <neleai at seznam dot cz> ---
I cannot duplicate this issue.
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* [Bug network/14001] getaddrinfo sometimes slow in multithreaded programs
2012-04-20 8:52 [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs wfpeltz at yahoo dot de
` (3 preceding siblings ...)
2013-11-06 11:25 ` neleai at seznam dot cz
@ 2014-06-25 11:14 ` fweimer at redhat dot com
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2014-06-25 11:14 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14001
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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2012-04-20 8:52 [Bug network/14001] New: getaddrinfo sometimes slow in multithreaded programs wfpeltz at yahoo dot de
2012-04-20 9:34 ` [Bug network/14001] " wfpeltz at yahoo dot de
2012-04-20 10:54 ` wfpeltz at yahoo dot de
2013-10-13 7:47 ` neleai at seznam dot cz
2013-11-06 11:25 ` neleai at seznam dot cz
2014-06-25 11:14 ` fweimer at redhat dot com
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