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[2021-11-08 09:01 UTC] erik at coretech dot se
Description:
------------
PHP crashes randomly with SIGSEGV (about 1/2 of the times) when the code below is executed.
==805465== Thread 2:
==805465== Jump to the invalid address stated on the next line
==805465== at 0xA08E150: ???
==805465== by 0x82DC159: start_thread (in /usr/lib64/libpthread-2.28.so)
==805465== by 0x800BDD2: clone (in /usr/lib64/libc-2.28.so)
==805465== Address 0xa08e150 is not stack'd, malloc'd or (recently) free'd
==805465==
==805465==
==805465== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==805465== Access not within mapped region at address 0xA08E150
==805465== at 0xA08E150: ???
==805465== by 0x82DC159: start_thread (in /usr/lib64/libpthread-2.28.so)
==805465== by 0x800BDD2: clone (in /usr/lib64/libc-2.28.so)
Test script:
---------------
<?php
class curltest {
public function start() {
$this->ch = curl_init();
$urlstr = "https://www.php.net/distributions/php-8.0.12.tar.gz";
curl_setopt($this->ch, CURLOPT_URL, $urlstr);
curl_setopt($this->ch, CURLOPT_RETURNTRANSFER, FALSE);
curl_setopt($this->ch, CURLOPT_WRITEFUNCTION, array($this, 'do_write'));
curl_setopt($this->ch, CURLOPT_PROGRESSFUNCTION, array($this, 'do_progress'));
curl_setopt($this->ch, CURLOPT_NOPROGRESS, FALSE);
curl_setopt($this->ch, CURLOPT_NOSIGNAL, TRUE);
$ret = curl_exec($this->ch);
}
private function do_write($ch, $data) {
return strlen($data);
}
private function do_progress($ch, $a = NULL, $b = NULL, $c = NULL, $d = NULL) {
return 1;
}
}
$c = new curltest();
$c->start();
Expected result:
----------------
No crash
Actual result:
--------------
Crashes with SIGSEGV
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Last updated: Fri Apr 19 15:01:28 2024 UTC |
An occasional segfault is reproducible for me on rocky linux 8.4 x86_64. Enabled remirepo for 8.0 since php 8.0 isn't provided by the distro. Trace: { "signal": 11 , "executable": "/usr/bin/php" , "stacktrace": [ { "crash_thread": true , "frames": [ { "address": 140011838288336 , "build_id_offset": 140011838288336 } ] } , { "frames": [ { "address": 140011872431189 , "build_id": "296658ed4f68231cb3ef55ded9b584404deed520" , "build_id_offset": 535637 , "function_name": "_int_free" , "file_name": "/lib64/libc.so.6" } , { "address": 94252436834069 , "build_id": "d65e2b1adddfb386f79a94fc816aea6cdf5c5ee5" , "build_id_offset": 2942741 , "function_name": "zend_hash_destroy" , "file_name": "/usr/bin/php" } , { "address": 94252437279985 , "build_id": "d65e2b1adddfb386f79a94fc816aea6cdf5c5ee5" , "build_id_offset": 3388657 , "function_name": "zend_interned_strings_dtor" , "file_name": "/usr/bin/php" } , { "address": 94252436355664 , "build_id": "d65e2b1adddfb386f79a94fc816aea6cdf5c5ee5" , "build_id_offset": 2464336 , "function_name": "php_module_shutdown" , "file_name": "/usr/bin/php" } , { "address": 94252435012844 , "build_id": "d65e2b1adddfb386f79a94fc816aea6cdf5c5ee5" , "build_id_offset": 1121516 , "function_name": "main" , "file_name": "/usr/bin/php" } ] } ] }You are not sending the userdata to be called. Your download method should be like this: curl_easy_setopt(handle, CURLOPT_PROGRESSFUNCTION, (curl_progress_callback)&myClass::download_progress); curl_easy_setopt(handle, CURLOPT_PROGRESSDATA, this); Also, your download_progress should be marked as static: class myClass{ int percent; ProgressBar bar; public: int download(const char* url, const char* filename, int enable_progress); static int download_progress(void *p, double dl, double dlnow, double ul, double ulnow); }; Thanks, (https://www.kantimemedicare.us/)github.com