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https://issues.apache.org/jira/browse/STDCXX-1071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13464295#comment-13464295
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Liviu Nicoara commented on STDCXX-1071:
---
The file library-reduction.cpp is a reduction of the numpunct library code down
to the essentials that still have the defect. The test case is intentionally
verbose (180LOC) so that it still shows the organization of the library code.
It exhibits the same failures as the original library code it has been
extracted from. It takes two defines on the command line:
1. NO_USE_STDCXX_LOCALES -- if defined it mimics the setting of the facet data
from the system locales
2. NO_USE_NUMPUNCT_CACHE -- if set, it does perfect forwarding, i.e., it does
not cache locale data in the facet
The runs, with SUNPro 5.12 on Linux, exhibit failures (renamed to t.cpp):
{noformat}
$ CC -O -mt t.cpp ./a.out
t.cpp, line 113: Warning: String literal converted to char* in assignment.
1 Warning(s) detected.
CC: Warning: failed to detect system linker version, falling back to custom
linker usage
16, 1000
*** glibc detected *** ./a.out: double free or corruption (fasttop):
0x00622b40 ***
*** glibc detected *** ./a.out: double free or corruption (fasttop):
0x7f6654000920 ***
=== Backtrace: =
/lib64/libc.so.6(+0x78f85)[0x7f666c031f85]
/lib64/libc.so.6(cfree+0x73)[0x7f666c035d93]
...
{noformat}
{noformat}
$ CC -DNO_USE_STDCXX_LOCALES -O -mt t.cpp ./a.out
t.cpp, line 113: Warning: String literal converted to char* in assignment.
1 Warning(s) detected.
CC: Warning: failed to detect system linker version, falling back to custom
linker usage
16, 1000
*** glibc detected *** ./a.out: double free or corruption (fasttop):
0x00622b40 ***
*** glibc detected *** ./a.out: double free or corruption (fasttop):
0x7fda68b0 ***
=== Backtrace: =
/lib64/libc.so.6=== Backtrace: =
/lib64/libc.so.6(cfree+0x73)[0x7fda6c8f2d93]
/lib64/libc.so.6(+0x78f85)[0x7fda6c8eef85]
noformat
The reduced program did not fail in my runs with NO_USE_NUMPUNCT_CACHE defined.
numpunct facet cache initialization is not thread -safe
---
Key: STDCXX-1071
URL: https://issues.apache.org/jira/browse/STDCXX-1071
Project: C++ Standard Library
Issue Type: Bug
Components: 22. Localization, Thread Safety
Affects Versions: 4.2.1, 4.2.x, 4.3.x, 5.0.0
Environment: $ uname -a; CC -V
Linux behemoth 2.6.37.6 #3 SMP Sat Apr 9 22:49:32 CDT 2011 x86_64 AMD
Opteron(tm) Processor 6134 AuthenticAMD GNU/Linux
CC: Sun C++ 5.12 Linux_i386 2011/11/16
Reporter: Liviu Nicoara
Priority: Critical
Labels: DCII, localization, numpunct, thread-safety
Fix For: 4.2.1, 4.2.x, 4.3.x, 5.0.0
Attachments: library-reduction.cpp
Original Estimate: 8h
Remaining Estimate: 8h
The bug affects the initialization of the cached data in numpunct facet. The
failing test is 22.locale.numpunct.cpp in certain builds: Linux with SUNPro
5.12, optimized, most likely to fail. It has been reported (see linked
incidents) to fail on SPARC as well. It manifests in variate ways: sometimes
as heap corruption, sometimes as access violations, etc. Test cases and
library reduction programs to follow.
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