[LLVMbugs] [Bug 12158] sig 11 sometimes when accessing std::cout from multiple threads.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12158

Seth <seth.cantrell at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #3 from Seth <seth.cantrell at gmail.com> ---
I've updated and rebuilt libcxx (r185275, git commit 02786c613), but the
example program still crashes sometimes.

I ran the program using the following bash command:

for i in {1..100}; do ./a.out > /dev/null; done

and the result with r185275 was:

Segmentation fault: 11
Segmentation fault: 11
Abort trap: 6
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Killed: 9
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Segmentation fault: 11
Abort trap: 6
Segmentation fault: 11

summary:
14 segmentation faults, two aborts, one hang (I killed the process from
Activity Monitor.app after several seconds).

Below are the command lines I used.

to update and build libc++:
git svn fetch && git merge git-svn; (cd lib;
CXX=~/Programming/llvm-ninja-build/bin/clang++ TRIPLE=-apple- ./buildit)

To compile:
/Users/socantre/Programming/llvm-ninja-build/bin/clang++ -nostdinc++ -I
~/Programming/libcxx/include -std=c++11 -c main.cpp

To link:
/Users/socantre/Programming/llvm-ninja-build/bin/clang++ -nostdlib -L
~/Programming/libcxx/lib -lc++ -lpthread main.o

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