PHP :: Bug #43920 :: Here is the xml file for the test case

Bug #43920	Here is the xml file for the test case
Submitted:	2008-01-23 12:01 UTC	Modified:	2008-01-23 22:53 UTC
From:	jdespatis at yahoo dot fr	Assigned:
Status:	Not a bug	Package:	PCRE related
PHP Version:	5.2.5	OS:	Linux Debian
Private report:	No	CVE-ID:	None

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From:	jdespatis at yahoo dot fr
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[2008-01-23 12:01 UTC] jdespatis at yahoo dot fr

Description:
------------
I have a 36k xml file
I launch preg_replace_callback on it, but php runs crazy 99% CPU




Reproduce code:
---------------
test case try this code with the 1087985.xml i give in attachment:

the aim is to cut the string ended by \r or \n or \x0, and launch a specific function (protocol_analyse) on each message

<?php
  function protocol_analyse($m) {
    echo "protocol_analyse:\n";
    print_r($m);
  }

  $buff = file_get_contents("1087985.xml");
  $start = microtime(true);
  $buff = preg_replace_callback("/([^\r\n\\x00]*)[\r\n\\x00]+/m",
                                "protocol_analyse",
                                $buff);
  $end = microtime(true);

  printf("Duration : %.2f", $end - $start);
?>

Expected result:
----------------
I expect the function to returns quick, but 99% CPU taken

Actual result:
--------------
Duration : 133.00 sec which is very very slow

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[2008-01-23 12:05 UTC] jdespatis at yahoo dot fr

<sound v="1"><log t="undefined">capture_music</log><log t="undefined">scene id=23</log><log t="undefined">lak_scene.initialize1 music_init_p=0</log><log t="undefined">lak_scene.initialize2 music=_level0.player_mc.scene_builder.music</log><log t="undefined">load_init track=0</log><log t="NaN">capture_update_timer NaN</log><log t="NaN">play_movie</log><log t="0">capture_start_timer 64683</log><log t="51">capture_update_timer 51</log><log t="270">capture_update_timer 270</log><log t="403">capture_update_timer 403</log><log t="536">capture_update_timer 536</log><log t="668">capture_update_timer 668</log><log t="800">capture_update_timer 800</log><log t="927">capture_update_timer 927</log><log t="1063">capture_update_timer 1063</log><log t="1199">capture_update_timer 1199</log><log t="1327">capture_update_timer 1327</log><log t="1459">capture_update_timer 1459</log><log t="1592">capture_update_timer 1592</log><log t="1732">capture_update_timer 1732</log><log t="1858">capture_update_timer 1858</log><log t="1991">capture_update_timer 1991</log><log t="2119">capture_update_timer 2119</log><log t="2251">capture_update_timer 2251</log><log t="2379">capture_update_timer 2379</log><log t="2516">capture_update_timer 2516</log><log t="2644">capture_update_timer 2644</log><log t="2776">capture_update_timer 2776</log><log t="2903">capture_update_timer 2903</log><log t="3035">capture_update_timer 3035</log><log t="3170">capture_update_timer 3170</log><log t="3304">capture_update_timer 3304</log><log t="3435">capture_update_timer 3435</log><log t="3566">capture_update_timer 3566</log><log t="3700">capture_update_timer 3700</log><log t="3828">capture_update_timer 3828</log><log t="3959">capture_update_timer 3959</log><log t="4095">capture_update_timer 4095</log><log t="4231">capture_update_timer 4231</log><log t="4363">capture_update_timer 4363</log><log t="4491">capture_update_timer 4491</log><log t="4616">capture_update_timer 4616</log><log t="4744">capture_update_timer 4744</log><log t="4880">capture_update_timer 4880</log><log t="5011">capture_update_timer 5011</log><log t="5143">capture_update_timer 5143</log><log t="5279">capture_update_timer 5279</log><start_sound t="5279" id="voice2" path="/resources/voices/10.mp3" volume="96" offset="5" /><log t="5279">update null,11,2 track_id=0</log><start_sound t="5279" id="fx1" path="/resources/fx/all/11.mp3" volume="40" /><log t="5411">capture_update_timer 5411</log><log t="5540">capture_update_timer 5540</log><log t="5676">capture_update_timer 5676</log><log t="5804">capture_update_timer 5804</log><log t="5804">loop_voice _level0.player_mc.scene_builder.scene.decor.elem8.tete</log><log t="5942">capture_update_timer 5942</log><log t="6075">capture_update_timer 6075</log><log t="6212">capture_update_timer 6212</log><log t="6346">capture_update_timer 6346</log><log t="6479">capture_update_timer 6479</log><log t="6604">capture_update_timer 6604</log><log t="6732">capture_update_timer 6732</log><log t="6868">capture_update_timer 6868</log><log t="7004">capture_update_timer 7004</log><log t="7131">capture_update_timer 7131</log><start_sound t="7131" id="voice3" path="/resources/voices/1.mp3" volume="144" offset="5" /><log t="7267">capture_update_timer 7267</log><log t="7403">capture_update_timer 7403</log><log t="7528">capture_update_timer 7528</log><log t="7656">capture_update_timer 7656</log><log t="7656">loop_voice _level0.player_mc.scene_builder.scene.decor.elem9.tete</log><log t="7795">capture_update_timer 7795</log><log t="7928">capture_update_timer 7928</log><log t="8053">capture_update_timer 8053</log><log t="8186">capture_update_timer 8186</log><log t="8315">capture_update_timer 8315</log><log t="8447">capture_update_timer 8447</log><log t="8447">update null,11,2 track_id=0</log><start_sound t="8447" id="fx2" path="/resources/fx/all/11.mp3" volume="40" /><log t="8576">capture_update_timer 8576</log><log t="8704">capture_update_timer 8704</log><log 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t="11346">capture_update_timer 11346</log><log t="11475">capture_update_timer 11475</log><log t="11606">capture_update_timer 11606</log><log t="11606">update null,11,2 track_id=0</log><start_sound t="11606" id="fx4" path="/resources/fx/all/11.mp3" volume="40" /><log t="11732">capture_update_timer 11732</log><log t="11865">capture_update_timer 11865</log><log t="11992">capture_update_timer 11992</log><start_sound t="11992" id="voice4" path="/resources/voices/10.mp3" volume="96" offset="5" /><log t="12127">capture_update_timer 12127</log><log t="12255">capture_update_timer 12255</log><log t="12387">capture_update_timer 12387</log><log t="12516">capture_update_timer 12516</log><log t="12516">loop_voice _level0.player_mc.scene_builder.scene.decor.elem8.tete</log><start_sound t="12516" id="voice5" path="/resources/voices/10.mp3" volume="96" offset="305" /><log t="12660">capture_update_timer 12660</log><log t="12780">capture_update_timer 12780</log><log t="12915">capture_update_timer 12915</log><log t="12915">loop_voice _level0.player_mc.scene_builder.scene.decor.elem8.tete</log><log t="13052">capture_update_timer 13052</log><start_sound t="13052" id="voice6" path="/resources/voices/1.mp3" volume="36" offset="5" /><log t="13176">capture_update_timer 13176</log><log t="13304">capture_update_timer 13304</log><log t="13439">capture_update_timer 13439</log><log t="13564">capture_update_timer 13564</log><log t="13564">loop_voice _level0.player_mc.scene_builder.scene.decor.elem9.tete</log><log t="13705">capture_update_timer 13705</log><log t="13837">capture_update_timer 13837</log><log t="13963">capture_update_timer 13963</log><log t="14105">capture_update_timer 14105</log><log t="14239">capture_update_timer 14239</log><log t="14369">capture_update_timer 14369</log><log t="14504">capture_update_timer 14504</log><log t="14628">capture_update_timer 14628</log><log t="14757">capture_update_timer 14757</log><log t="14892">capture_update_timer 14892</log><log 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t="31128">lak_scene.initialize2 music=_level0.player_mc.scene_builder.music</log><log t="31128">load_init track=6</log><log t="31313">capture_update_timer 31313</log><log t="31412">capture_update_timer 31412</log><log t="31666">capture_update_timer 31666</log><log t="31801">capture_update_timer 31801</log><log t="31936">capture_update_timer 31936</log><log t="32064">capture_update_timer 32064</log><log t="32200">capture_update_timer 32200</log><log t="32336">capture_update_timer 32336</log><log t="32480">capture_update_timer 32480</log><log t="32607">capture_update_timer 32607</log><log t="32741">capture_update_timer 32741</log><log t="32869">capture_update_timer 32869</log><log t="33004">capture_update_timer 33004</log><log t="33140">capture_update_timer 33140</log><log t="33276">capture_update_timer 33276</log><log t="33404">capture_update_timer 33404</log><log t="33529">capture_update_timer 33529</log><log t="33665">capture_update_timer 33665</log><log t="33801">capture_update_timer 33801</log><log t="33936">capture_update_timer 33936</log><log t="34064">capture_update_timer 34064</log><log t="34200">capture_update_timer 34200</log><log t="34336">capture_update_timer 34336</log><log t="34468">capture_update_timer 34468</log><log t="34593">capture_update_timer 34593</log><log t="34730">capture_update_timer 34730</log><log t="34857">capture_update_timer 34857</log><log t="34992">capture_update_timer 34992</log><log t="35128">capture_update_timer 35128</log><log t="35264">capture_update_timer 35264</log><log t="35392">capture_update_timer 35392</log><log t="35525">capture_update_timer 35525</log><log t="35653">capture_update_timer 35653</log><log t="35789">capture_update_timer 35789</log><log t="35916">capture_update_timer 35916</log><log t="36040">capture_update_timer 36040</log><log t="36172">capture_update_timer 36172</log><log t="36172">update null,29,3 track_id=6</log><start_sound t="36172" id="fx10" path="/resources/fx/all/29.mp3" volume="60" /><log t="36304">capture_update_timer 36304</log><log t="36304">update 6,86,3 track_id=6</log><start_sound t="36304" id="music0" path="/resources/music/all/6.mp3" volume="120" loop="yes" /><start_sound t="36304" id="fx11" path="/resources/fx/all/86.mp3" volume="60" /><log t="36436">capture_update_timer 36436</log><log t="36565">capture_update_timer 36565</log><log t="36697">capture_update_timer 36697</log><log t="36825">capture_update_timer 36825</log><log t="36952">capture_update_timer 36952</log><log t="37080">capture_update_timer 37080</log><log t="37217">capture_update_timer 37217</log><log t="37348">capture_update_timer 37348</log><log t="37481">capture_update_timer 37481</log><log t="37617">capture_update_timer 37617</log><log t="37753">capture_update_timer 37753</log><log t="37881">capture_update_timer 37881</log><log t="38012">capture_update_timer 38012</log><log t="38140">capture_update_timer 38140</log><log t="38276">capture_update_timer 38276</log><log t="38404">capture_update_timer 38404</log><log t="38529">capture_update_timer 38529</log><log t="38661">capture_update_timer 38661</log><log t="38789">capture_update_timer 38789</log><log t="38916">capture_update_timer 38916</log><log t="39052">capture_update_timer 39052</log><log t="39188">capture_update_timer 39188</log><log t="39320">capture_update_timer 39320</log><log t="39452">capture_update_timer 39452</log><log t="39585">capture_update_timer 39585</log><log t="39713">capture_update_timer 39713</log><log t="39841">capture_update_timer 39841</log><log t="39841">update 7,42,5 track_id=6</log><change_volume t="39841" id="music0" volume="140" /><start_sound t="39841" id="fx12" path="/resources/fx/all/42.mp3" volume="100" /><log t="39976">capture_update_timer 39976</log><log t="40104">capture_update_timer 40104</log><log t="40240">capture_update_timer 40240</log><log t="40368">capture_update_timer 40368</log><log t="40504">capture_update_timer 40504</log><log t="40629">capture_update_timer 40629</log><log t="40757">capture_update_timer 40757</log><log t="40892">capture_update_timer 40892</log><log t="41028">capture_update_timer 41028</log><log t="41164">capture_update_timer 41164</log><log t="41300">capture_update_timer 41300</log><log t="41428">capture_update_timer 41428</log><log t="41561">capture_update_timer 41561</log><log t="41689">capture_update_timer 41689</log><log t="41825">capture_update_timer 41825</log><log t="41952">capture_update_timer 41952</log><log t="42084">capture_update_timer 42084</log><log t="42212">capture_update_timer 42212</log><log t="42344">capture_update_timer 42344</log><log t="42484">capture_update_timer 42484</log><log t="42610">capture_update_timer 42610</log><log t="42745">capture_update_timer 42745</log><log t="42877">capture_update_timer 42877</log><log t="43004">capture_update_timer 43004</log><log t="43132">capture_update_timer 43132</log><log t="43268">capture_update_timer 43268</log><log 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t="79582">capture_update_timer 79582</log><log t="79710">capture_update_timer 79710</log><log t="79842">capture_update_timer 79842</log><log t="79982">capture_update_timer 79982</log><log t="80117">capture_update_timer 80117</log><log t="80245">capture_update_timer 80245</log><log t="80381">capture_update_timer 80381</log><log t="80518">capture_update_timer 80518</log><log t="80650">capture_update_timer 80650</log><log t="80782">capture_update_timer 80782</log><log t="80917">capture_update_timer 80917</log><log t="81053">capture_update_timer 81053</log><log t="81185">capture_update_timer 81185</log><log t="81317">capture_update_timer 81317</log><end t="81317" /></sound>

[2008-01-23 12:08 UTC] jdespatis at yahoo dot fr

You can also retrieve this xml file at this address:
http://www.despatis.com/1087985.xml

As i don't find the way to add an attachment on this bug report..

[2008-01-23 21:32 UTC] felipe@php.net

This isn't a bug. 

Your pattern is slower because it makes backtracking a lot.

See an example, analyzing the work of PCRE with a simple string:
http://paste.la/24

For information about backtracking, and optimization:
http://www.pcre.org/man.txt

[2008-01-23 22:53 UTC] iliaa@php.net

Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit http://www.php.net/support.php as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

.

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