Re: Re: Bug #1251 Updated: snmpwalk function causes segfault

On Sat, Apr 03, 1999 at 05:46:01PM +0200, Michal Kara wrote: > > ID: 1251 > > Updated by: sas > > Reported By: lemming@k332.feld.cvut.cz > > Status: Open > > Bug Type: Reproduceable crash > > Assigned To: > > Comments: > > > > I cannot reproduce that effect here. Could you provide a backtrace? > > > > Make sure to use ucd-snmp-3.6.1 . Maybe they changed function? As I wrote, > the problem is that snmp_free frees community string you used, but php > passes pointer to its variable structure. I've used exactly that version to test snmprealwalk. Please check if you have old libraries/header files somewhere which conflict with the latest version. Running your program yields: $ ./php snmp Content-type: text/html Hello world! '0' = '"Linux flaubert.foo.bar 2.2.2-ac7 #3 Die Mär 30 23:33:04 CEST 1999 alpha"'<BR> '1' = 'OID: enterprises.ucdavis.ucdSnmpAgent.linux'<BR> [...] > > --- > > Backtrace: > > Starting program: /usr/local/bin/php snmp.php > Content-type: text/html > > Hello world! > > Program received signal SIGSEGV, Segmentation fault. > 0x400c3373 in chunk_free (ar_ptr=0x4011d1a0, p=0x80f3840) at malloc.c:2945 > malloc.c:2945: No such file or directory. > (gdb) bt > #0 0x400c3373 in chunk_free (ar_ptr=0x4011d1a0, p=0x80f3840) at malloc.c:2945 > #1 0x400c3241 in __libc_free (mem=0x80f3848) at malloc.c:2872 > #2 0x8092300 in snmp_free (cp=0x80f3848) at snmp_api.c:650 > #3 0x80923bf in snmp_sess_close (sessp=0x80f47d0) at snmp_api.c:700 > #4 0x8092432 in snmp_close (session=0x80f4800) at snmp_api.c:734 > #5 0x80821ec in _php3_snmp (ht=0x80f3720, return_value=0x80b5478, list=0x80c70e8, > plist=0x80c70bc, st=2) at functions/snmp.c:257 > #6 0x808224b in php3_snmpwalk (ht=0x80f3720, return_value=0x80b5478, list=0x80c70e8, > plist=0x80c70bc) at functions/snmp.c:270 > #7 0x8053b9c in phpparse () at control_structures_inline.h:930 > #8 0x805ad57 in php3_parse (yyin=0x80ed6c8) at main.c:1534 > #9 0x805b5b9 in main (argc=2, argv=0xbffff8a4) at main.c:1842 > > --------------- > > The program that caused segfault: > > - > Hello world! > <? > $a = snmpwalk("localhost","public","system"); > while(list($k,$v) = each($a)) echo "'$k' = '$v'<BR>\n"; > ?> > - > > > I hope this will help. > > Michal Kara alias lemming > > > -- > PHP Development Mailing List http://www.php.net/ > To unsubscribe send an empty message to php-dev-unsubscribe@lists.php.net > For help: php-dev-help@lists.php.net > > -- Regards, Sascha Schumann | Consultant | finger sas@schell.de | for PGP public key -- PHP Development Mailing List http://www.php.net/ To unsubscribe send an empty message to php-dev-unsubscribe@lists.php.net For help: php-dev-help@lists.php.net