[
https://issues.apache.org/jira/browse/THRIFT-2182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13869176#comment-13869176
]
Hudson commented on THRIFT-2182:
--------------------------------
FAILURE: Integrated in Thrift #999 (See
[https://builds.apache.org/job/Thrift/999/])
THRIFT-2182 rb: segfault in regression tests (GC bug in
rb_thrift_memory_buffer_write) (roger: rev
0240572c44c64c3ab1d498d32a9a1530ab91b0da)
* lib/rb/ext/compact_protocol.c
* lib/rb/ext/struct.c
* lib/rb/ext/memory_buffer.c
> segfault in regression tests (GC bug in rb_thrift_memory_buffer_write)
> ----------------------------------------------------------------------
>
> Key: THRIFT-2182
> URL: https://issues.apache.org/jira/browse/THRIFT-2182
> Project: Thrift
> Issue Type: Bug
> Components: Ruby - Library
> Affects Versions: 0.9.1, 0.9.2
> Reporter: Paul Brannan
> Assignee: Roger Meier
> Labels: easyfix, patch
> Attachments: thrift-0.9.1-stringvalueptr.patch
>
>
> This bug causes the regression tests to segfault on my machine. As this is a
> GC bug, it may or may not be easily reproducible.
> The rb_thrift_memory_buffer_write function looks like this:
> {code:none}
> VALUE rb_thrift_memory_buffer_write(VALUE self, VALUE str) {
> VALUE buf = GET_BUF(self);
> str = force_binary_encoding(str);
> rb_str_buf_cat(buf, RSTRING_PTR(str), RSTRING_LEN(str));
> return Qnil;
> }
> {code}
> When gcc compiles this, it optimizes away the value of str (it is no longer
> used after RSTRING_PTR(str) and RSTRING_LEN(str) are computed). Later,
> rb_str_buf_cat invokes the GC, and the string referenced by str is collected,
> because there are no references to it on the stack.
> Some possible solutions:
> * Use StringValuePtr instead of RSTRING_PTR (in general RSTRING_PTR should be
> avoided in favor of StringValuePtr or StringValueCStr); I believe this will
> also fix #THRIFT-1047
> * Use rb_str_cat instead of rb_str_buf_cat
> * Use RB_GC_GUARD to prevent str from getting collected
> It appears a similar bug may exist with buffer_value in
> rb_thrift_memory_buffer_read_into_buffer, and possibly in any of the other 30
> places that RSTRING_PTR is used.
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
