http://llvm.org/bugs/show_bug.cgi?id=21995
Bug ID: 21995
Summary: Infrequent deadlocks with std::future
Product: libc++
Version: 3.4
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 13582
--> http://llvm.org/bugs/attachment.cgi?id=13582&action=edit
Simple app to stress-test std::future
We see occasional deadlocks with std::future, first observed on iOS. We then
wrote a test program (attached) to try and isolate the problem. The test
program simulates a work queue and repeatedly creates stack-allocated futures
to track background "tasks".
The program deadlocks when built for OS X in both Xcode 5.1 & 6.1.1.
It also fails when compiled on Ubuntu Trusty with clang 3.4 and clang 3.6, but
segfaults rather than deadlocking.
Test program compiled as:
clang++-3.6 -o future-shock -std=c++11 -pthread -g future_shock.cpp
vagrant@vagrant-ubuntu-trusty-64:~$ clang++-3.6 -v
Ubuntu clang version 3.6.0-svn224581-1~exp1 (trunk) (based on LLVM 3.6.0)
Target: x86_64-pc-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8.2
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.2
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.1
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8
Candidate multilib: .;@m64
Selected multilib: .;@m64
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