At 2013-07-08 18:00:03,[email protected] wrote: >Send libssh2-devel mailing list submissions to > [email protected] > >To subscribe or unsubscribe via the World Wide Web, visit > http://cool.haxx.se/cgi-bin/mailman/listinfo/libssh2-devel >or, via email, send a message with subject or body 'help' to > [email protected] > >You can reach the person managing the list at > [email protected] > >When replying, please edit your Subject line so it is more specific >than "Re: Contents of libssh2-devel digest..." > > >Today's Topics: > > 1. Re:Re:Re: Segmentation fault libssh2_session_last_errno > (session=0x0) at session.c:1219 (Daniel Stenberg) (balloon) > > >---------------------------------------------------------------------- > >Message: 1 >Date: Mon, 8 Jul 2013 10:46:30 +0800 (CST) >From: balloon <[email protected]> >To: [email protected], [email protected] >Subject: Re:Re:Re: Segmentation fault libssh2_session_last_errno > (session=0x0) at session.c:1219 (Daniel Stenberg) >Message-ID: <[email protected]> >Content-Type: text/plain; charset="gbk" > >>This shows that the problem is in libcurl when sends a NULL to libssh2 so >>that >>it crashes. > >>I'm cc'ing this reply to the libcurl mailing list. Please take follow-ups >>there. I'd like you to rebuild libcurl with debug symbols left so that the >>stack trace becomes usable. > >>It shouldn't matter that it is Java, but it can very well be a problem that >>occurs only with that specific server implementation. >I have tried hard to rebuild libcurl & libssh2 & openssl in debug mode. And >succeed to reproduce segmentation fault, though this time seg info seems >different.Here is my src code:#include <iostream> >#include <curl.h> > >size_t write_callback(void *f_fp_ptr, size_t f_size, size_t f_nmemb, void >*fp_stream) >{ > > size_t len = fwrite(f_fp_ptr, f_size, f_nmemb, (FILE *)fp_stream); > return len; >} > >int main(int argc, char**argv) >{ >char host[100]; >if(argc < 2) >{ >std::cout<<"Nonono~~~input sftpserver ip pls."<<std::endl; >return 1; >} >strcpy(host,argv[1]); >std::string sftp_url="sftp://";; >sftp_url+=host; >sftp_url+="/a.txt";curl_easy_setopt(curl, CURLOPT_URL, sftp_url.c_str()); >CURL *curl = curl_easy_init(); > if (!curl) > { > std::cout<<"Fail to initialize curl."<<std::endl; > return 1; > } > curl_easy_setopt(curl, CURLOPT_SSH_AUTH_TYPES, CURLSSH_AUTH_PASSWORD); > curl_easy_setopt(curl, CURLOPT_USERPWD, "test:test"); > FILE *fd = fopen("tmp.txt", "w"); > > curl_easy_setopt(curl, CURLOPT_WRITEDATA, fd); > curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); > curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback); > > // specify downloading file size > curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)1); > CURLcode res = CURL_LAST; > > res = curl_easy_perform(curl); > > if (CURLE_OK == res) > { > std::cout<<"succeed."<<std::endl; > curl_easy_cleanup(curl); > return 0; > } > else > { > std::cout<<"fail."<<std::endl; > curl_easy_cleanup(curl); > return 1; > } >} > >Here is the result, pls let me know what can I do next. Thanks. >Starting program: /root/a.out 9.111.23.100 >warning: no loadable sections found in added symbol-file system-supplied DSO >at 0x2aaaaaaab000 >[Thread debugging using libthread_db enabled] >sftp url: sftp://9.111.23.100/a.txt >* STATE: INIT => CONNECT handle 0x86ecc8; line 1020 (connection #-5000) >* About to connect() to 9.111.23.100 port 22 (#0) >* Trying 9.111.23.100... >* Adding handle: conn: 0x877cf8 >* Adding handle: send: 0 >* Adding handle: recv: 0 >* Curl_addHandleToPipeline: length: 1 >* 0x865828 is at send pipe head! >* - Conn 0 (0x877cf8) send_pipe: 1, recv_pipe: 0 >* STATE: CONNECT => WAITCONNECT handle 0x86ecc8; line 1067 (connection #0) >* Connected to 9.111.23.100 (9.111.23.100) port 22 (#0) >* SFTP 0x8781e0 state change from SSH_STOP to SSH_INIT >* SFTP 0x8781e0 state change from SSH_INIT to SSH_S_STARTUP >* STATE: WAITCONNECT => PROTOCONNECT handle 0x86ecc8; line 1180 (connection >#0) > >Program received signal SIGSEGV, Segmentation fault. >0x0000000000000000 in ?? () >(gdb) bt >#0 0x0000000000000000 in ?? () >#1 0x00000000005c4a20 in DES_SPtrans () >#2 0x00000032759549e0 in ?? () from /lib64/libc.so.6 >#3 0x0000000000000014 in ?? () >#4 0x0000000000885778 in ?? () >#5 0x0000000000887437 in ?? () >#6 0x0000000000886780 in ?? () >#7 0x00000000008869c0 in ?? () >#8 0x0000000000886980 in ?? () >#9 0xc3e557dbb4ac6000 in ?? () >#10 0x22f09ddde873b1bc in ?? () >#11 0x000000005c053c02 in ?? () >#12 0x000000000088649c in ?? () >#13 0x00007fffffffce30 in ?? () >#14 0x000000000057f169 in hostkey_method_ssh_dss_sig_verify (session=Cannot >access memory at address 0xffffffffffffffe8 >) > at hostkey.c:329 >Backtrace stopped: previous frame inner to this frame (corrupt stack?) >(gdb) > I can also send u the SFTP server binary to reproduce and investigate this issue, but I fail to attach it in this mail loop due to size limitation. Pls specify some space that I can upload the SFTP server binary if u need it, thanks :)
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