infinite recursion in 27.objects

• Key: STDCXX-804
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Critical
• Assignee: Martin Sebor
• Reporter: Martin Sebor
• Component/s: Tests
• Fix Version/s: 4.2.1

Description

When compiled with MSVC (both 8 and 9), in the 15s, 15S configurations, the test 27.objects is failing with the Windows equivalent of SIGSEGV.

In stdcxx 4.2.0, the test ran successfully to completion (with both MSVC 7.1 and 8.0).

Comments

[Martin Sebor]

Possibly related to (or even a duplicate of) STDCXX-813 observed on other platforms, including AIX, HP-UX, and Solaris.

[Farid Zaripov]

The problem introduced with changes for STDCXX-626.

-------
std::cout.tie (&std::cerr);
...

std::cerr.tie (&std::cout);
std::cerr << std::cerr.tie () << ' ';
-------

Here cout tied with cerr and cerr tied with cout.

The cerr::operator<<() constructs sentry object (in __rw_insert()), the sentry ctor flushes tied cout stream (in _C_opfx()), the cout.flush() also constructs the sentry object, which flushes the tied cerr stream and so on until stack overflow occurs.

[Martin Sebor]

Attached c++std-lib-20887 with the proposed resolution sent to the C++ committe's reflector.

[Martin Sebor]

Guesstimating 3 hours.

[Martin Sebor]

This isn't MSVC-specific but rather affects all platforms.

[Martin Sebor]

Fixed in r643210.
Regression test committed in r643226.
Provided nightly builds confirm the fix will close after integrating into 4.2.x in the next bulk merge.

[Farid Zaripov]

Fix and regression test are merged in 4.2.x branch thus: http://svn.apache.org/viewvc?view=rev&revision=648752

[Martin Sebor]

Verified on 4.2.x and 4.3.x.