Invalid Pointer Error

[rickhuizinga]

I'm having problems using node-perl, where an invalid pointer is attempted to be freed during a call into node-perl. See the following backtrace:

*** Error in `node': free(): invalid pointer: 0x00000000029fd438 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x766be)[0x7faf296136be]
/lib64/libc.so.6(+0x77427)[0x7faf29614427]
/usr/lib64/perl5/CORE/libperl.so(Perl_safesysrealloc+0x55)[0x7faf151c7265]
/usr/lib64/perl5/CORE/libperl.so(Perl_push_scope+0x5b)[0x7faf15218c0b]
/home/ec2-user/dev/import-piercewa/node_modules/geo-streetaddress-us/node_modules/perl/build/Release/perl.node(_ZN14NodePerlMethod4callERKN2v89ArgumentsE+0xb0)[0x7faf117cd810]
node[0x5c1107]
[0x15ff0bd0618e]
======= Memory map: ========
00400000-00c4b000 r-xp 00000000 ca:01 3872                               /usr/local/bin/node
00e4a000-00e60000 rwxp 0084a000 ca:01 3872                               /usr/local/bin/node
00e60000-00e68000 rwxp 00000000 00:00 0 
0296a000-02c8d000 rwxp 00000000 00:00 0                                  [heap]
a7400e000-a7400f000 r-xp 00000000 00:00 0 
10d2bd00000-10d2be00000 rwxp 00000000 00:00 0 
76cfda00000-76cfdb00000 rwxp 00000000 00:00 0 
961d6b00000-961d6b35000 rwxp 00000000 00:00 0 
e1eb1600000-e1eb1700000 rwxp 00000000 00:00 0 
ef2c8500000-ef2c8600000 rwxp 00000000 00:00 0 
10ca58300000-10ca58400000 rwxp 00000000 00:00 0 
11f73c800000-11f73c900000 rwxp 00000000 00:00 0 
122c116ec000-122c116ed000 r-xp 00000000 00:00 0 
1272eb100000-1272eb200000 rwxp 00000000 00:00 0 
14a336000000-14a336800000 ---p 00000000 00:00 0 
14a336800000-14a337000000 rwxp 00000000 00:00 0 
14a337000000-14a337800000 ---p 00000000 00:00 0 
14a337800000-14a338000000 rwxp 00000000 00:00 0 
15dd9da22000-15dd9da23000 r-xp 00000000 00:00 0 
15ff0bc18000-15ff0bd00000 ---p 00000000 00:00 0 
15ff0bd00000-15ff0bd05000 rwxp 00000000 00:00 0 
15ff0bd05000-15ff0bd06000 ---p 00000000 00:00 0 
15ff0bd06000-15ff0bdff000 rwxp 00000000 00:00 0 
15ff0bdff000-15ff0c500000 ---p 00000000 00:00 0 
15ff0c500000-15ff0c505000 rwxp 00000000 00:00 0 
15ff0c505000-15ff0c506000 ---p 00000000 00:00 0 
15ff0c506000-15ff0c5ff000 rwxp 00000000 00:00 0 
15ff0c5ff000-15ff0ca00000 ---p 00000000 00:00 0 
15ff0ca00000-15ff0ca05000 rwxp 00000000 00:00 0 
15ff0ca05000-15ff0ca06000 ---p 00000000 00:00 0 
15ff0ca06000-15ff0caff000 rwxp 00000000 00:00 0 
15ff0caff000-15ff0d300000 ---p 00000000 00:00 0 
15ff0d300000-15ff0d305000 rwxp 00000000 00:00 0 
15ff0d305000-15ff0d306000 ---p 00000000 00:00 0 
15ff0d306000-15ff0d3ff000 rwxp 00000000 00:00 0 
15ff0d3ff000-15ff0db00000 ---p 00000000 00:00 0 
15ff0db00000-15ff0db05000 rwxp 00000000 00:00 0 
15ff0db05000-15ff0db06000 ---p 00000000 00:00 0 
15ff0db06000-15ff0dbff000 rwxp 00000000 00:00 0 
15ff0dbff000-15ff2bc18000 ---p 00000000 00:00 0 
181cade00000-181cadf00000 rwxp 00000000 00:00 0 
192d9ff00000-192d9ff85000 rwxp 00000000 00:00 0 
1d2313e00000-1d2313e25000 rwxp 00000000 00:00 0 
1f30cee04000-1f30cee05000 r-xp 00000000 00:00 0 
201c85900000-201c85a00000 rwxp 00000000 00:00 0 
2251d37ed000-2251d39ed000 rwxp 00000000 00:00 0 
277d2c669000-277d2c66a000 r-xp 00000000 00:00 0 
2991dc1a5000-2991dc1c0000 ---p 00000000 00:00 0 
2991dc1c0000-2991dc1e0000 rwxp 00000000 00:00 0 
2991dc1e0000-2991dc205000 ---p 00000000 00:00 0 
2bec7cd00000-2bec7ce00000 rwxp 00000000 00:00 0 
306637600000-306637625000 rwxp 00000000 00:00 0 
338078a00000-338078b00000 rwxp 00000000 00:00 0 
34de49000000-34de49100000 rwxp 00000000 00:00 0 
365aff600000-365aff700000 rwxp 00000000 00:00 0 
3caadb200000-3caadb300000 rwxp 00000000 00:00 0 
3d5615100000-3d5615200000 rwxp 00000000 00:00 0 
7faf00000000-7faf04000000 rwxs 00000000 ca:01 524581                     /home/ec2-user/dev/import-piercewa/db/piercewa.ejdb_properties.idx.sexternal_id.lex
7faf04000000-7faf08000000 rwxs 00000000 ca:01 524580                     /home/ec2-user/dev/import-piercewa/db/piercewa.ejdb_properties
7faf08000000-7faf0c000000 rwxs 00000000 ca:01 524579                     /home/ec2-user/dev/import-piercewa/db/piercewa.ejdb
7faf0c000000-7faf0c021000 rwxp 00000000 00:00 0 
7faf0c021000-7faf10000000 ---p 00000000 00:00 0 
7faf117c5000-7faf117d1000 r-xp 00000000 ca:01 1725850                    /home/ec2-user/dev/import-piercewa/node_modules/geo-streetaddress-us/node_modules/perl/build/Release/perl.node
7faf117d1000-7faf119d0000 ---p 0000c000 ca:01 1725850                    /home/ec2-user/dev/import-piercewa/node_modules/geo-streetaddress-us/node_modules/perl/build/Release/perl.node
7faf119d0000-7faf119d1000 rwxp 0000b000 ca:01 1725850                    /home/ec2-user/dev/import-piercewa/node_modules/geo-streetaddress-us/node_modules/perl/build/Release/perl.node
7faf119d1000-7faf119d9000 r-xp 00000000 ca:01 1725899                    /home/ec2-user/dev/import-piercewa/node_modules/realvana-db/node_modules/bcrypt/build/Release/bcrypt_lib.node
7faf119d9000-7faf11bd8000 ---p 00008000 ca:01 1725899                    /home/ec2-user/dev/import-piercewa/node_modules/realvana-db/node_modules/bcrypt/build/Release/bcrypt_lib.node
7faf11bd8000-7faf11bd9000 rwxp 00007000 ca:01 1725899                    /home/ec2-user/dev/import-piercewa/node_modules/realvana-db/node_modules/bcrypt/build/Release/bcrypt_lib.node
7faf11bd9000-7faf11bde000 r-xp 00000000 ca:01 7787                       /lib64/libnss_dns-2.17.so
7faf11bde000-7faf11ddd000 ---p 00005000 ca:01 7787                       /lib64/libnss_dns-2.17.so
7faf11ddd000-7faf11dde000 r-xp 00004000 ca:01 7787                       /lib64/libnss_dns-2.17.so
7faf11dde000-7faf11ddf000 rwxp 00005000 ca:01 7787                       /lib64/libnss_dns-2.17.so
7faf11ddf000-7faf11deb000 r-xp 00000000 ca:01 7792                       /lib64/libnss_files-2.17.so
7faf11deb000-7faf11fea000 ---p 0000c000 ca:01 7792                       /lib64/libnss_files-2.17.so
7faf11fea000-7faf11feb000 r-xp 0000b000 ca:01 7792                       /lib64/libnss_files-2.17.so
7faf11feb000-7faf11fec000 rwxp 0000c000 ca:01 7792                       /lib64/libnss_files-2.17.so
7faf11fec000-7faf11fed000 ---p 00000000 00:00 0 
7faf11fed000-7faf127ed000 rwxp 00000000 00:00 0                          [stack:29247]
7faf127ed000-7faf127ee000 ---p 00000000 00:00 0 
7faf127ee000-7faf12fee000 rwxp 00000000 00:00 0                          [stack:29246]
7faf12fee000-7faf12fef000 ---p 00000000 00:00 0 
7faf12fef000-7faf137ef000 rwxp 00000000 00:00 0                          [stack:29245]
7faf137ef000-7faf137f0000 ---p 00000000 00:00 0 
7faf137f0000-7faf13ff0000 rwxp 00000000 00:00 0                          [stack:29244]
7faf13ff0000-7faf13ff1000 r-xp 00000000 ca:01 1725915                    /home/ec2-user/dev/import-piercewa/node_modules/realvana-db/node_modules/mongoose/node_modules/mongodb/node_modules/kerberos/build/Release/kerberos.nodeAborted```

[rickhuizinga]

This appears to be a low-memory memory-allocation error.

I.e. running test-case code in a stand-alone node program works. Running test-case code within much larger program (many more node-modules loaded) yields this pointer error and/or segmentation fault.

[tokuhirom]

hmm. patches welcome.

tokuhirom

On Sat, May 31, 2014 at 9:14 AM, Rick Huizinga notifications@github.com
wrote:

This appears to be a low-memory memory-allocation error.

I.e. running test-case code in a stand-alone node program works. Running
test-case code within much larger program (many more node-modules loaded)
yields this pointer error and/or segmentation fault.

—
Reply to this email directly or view it on GitHub
#7 (comment).

[rickhuizinga]

@tokuhirom I found the problem. I think it is best solved (for now) by adding to the documentation.

The object returned by perl.getClass(...) should not be saved for future use. This is because its internal state appears to have a finite lifetime due to internal calls to sv_2mortal(...).

In the following code example:

var Perl = require("perl").Perl, perl = new Perl();

perl.use("Geo::StreetAddress::US");
var GeoStreetAddressUS = perl.getClass("Geo::StreetAddress::US");
GeoStreetAddressUS.avoid_redundant_street_type(true);

exports.parseSync = function(address_string) {
  return GeoStreetAddressUS.parse_address(address_string);
}

Calling this module's parseSync function MAY fail, depending on when the internal reference count of the object relating to the sv_2mortal(...) call has been decremented and its' memory has been freed and/or overwritten.

The documentation for getClass(...) should state that the returned value should not be saved for future use because its internal state may no longer be valid beyond the current iteration of the Node.js Event Loop.

For example, the following code would always work:

var Perl = require("perl").Perl, perl = new Perl();

perl.use("Geo::StreetAddress::US");
perl.getClass("Geo::StreetAddress::US").avoid_redundant_street_type(true);

exports.parseSync = function(address_string) {
  return perl.getClass("Geo::StreetAddress::US").parse_address(address_string);
}