ID: 46756 Updated by: magical...@php.net Reported By: kyle at ifixit dot com -Status: Verified +Status: Closed Bug Type: cURL related Operating System: * PHP Version: 5CVS, 6CVS (2008-12-08) New Comment:
This bug has been fixed in libcurl's CVS. Snapshots of libcurl's sources are packaged every day; this change will be in the next snapshot. You can grab the snapshot at http://cool.haxx.se/curl-daily/. Thank you for the report, and for helping us make libcurl and PHP better. Previous Comments: ------------------------------------------------------------------------ [2008-12-11 07:56:17] magical...@php.net Confirmed against curl 7.19.2 and more debug data posted to libcurl's bug tracker. https://sourceforge.net/tracker/index.php?func=detail&aid=2416182&group_id=976&atid=100976 ------------------------------------------------------------------------ [2008-12-11 07:18:50] magical...@php.net This bug has been reproduced without PHP by reproducing the same sequence in C. $ svn co http://ookoo.org/svn/snip/curl_bug ... $ cd curl_bug $ make ... $ gdb ./curl_bug ... #0 0x00007f81692626c9 in ?? () from /usr/lib/libcurl.so.4 #1 0x00007f8169263ec4 in ?? () from /usr/lib/libcurl.so.4 #2 0x00007f816926444c in Curl_connect () from /usr/lib/libcurl.so.4 #3 0x00007f81692721ba in ?? () from /usr/lib/libcurl.so.4 #4 0x00007f8169272a6e in curl_multi_perform () from /usr/lib/libcurl.so.4 #5 0x0000000000400b34 in main (argc=1, argv=0x7fff716a14d8) at test.c:36 I'll build latest curl with debug mode, check if this can be reproduced, and if so, I'll open a but on libcurl providing more debug informations. ------------------------------------------------------------------------ [2008-12-10 19:32:11] magical...@php.net I checked the origin of the crash, and it seems that libcurl does NOT behave good if you duplicate a handle while it's part of a curl_multi. Calling curl_multi_remove_handle($mh, $conn[$i]); before $conn2[$i] = curl_copy_handle($conn[$i]); fixes the issue. Checking curl's documentation, I found it to be quite picky about processing order. I believe this is either a bug in libcurl, or a "feature". libcurl's manpages are not providing exact informations about calling curl_easy_duphandle() on a curl handle part of a curl_multi. I'm going to investigate this more and either fix this bug (by providing a patch) or mark it as bogus (if this is a curl feature). ------------------------------------------------------------------------ [2008-12-08 11:33:38] j...@php.net Verified with latest CVS + Curl 7.18.2 ------------------------------------------------------------------------ [2008-12-07 16:45:51] kyle at ifixit dot com Reproducible using libcurl/7.19.2 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5 on kernel 2.6.18-53.1.14.el5. This is not a new bug-- also reproducible with PHP 5.2.6 and an older version of libcurl. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/46756 -- Edit this bug report at http://bugs.php.net/?id=46756&edit=1
