KLEE for C++ programs using pthreads.

[Dilip Murali]

Hello Klee developers,

I am a beginner trying to use KLEE.
I am using the KLEE self contained package to on a C++ program that
uses pthreads.
I have generated a .o file and used KLEE with the following option

klee --libc=uclibc --posix-runtime test.o

But i see i get warning

KLEE: NOTE: Using model:
/home/pgbovine/klee/Release+Asserts/lib/libkleeRuntimePOSIX.bca
KLEE: output directory = "klee-out-4"
KLEE: WARNING: undefined reference to function: klee_get_valuel
KLEE: WARNING: undefined reference to function: pthread_create
KLEE: WARNING: undefined reference to function: pthread_exit
KLEE: WARNING: undefined reference to function: pthread_join
KLEE: WARNING: executable has module level assembly (ignoring)
KLEE: WARNING: calling external: syscall(54, 0, 21505, 571522624)
KLEE: WARNING: calling __user_main with extra arguments.
KLEE: WARNING: calling external: pthread_create(571589384, 0,
563903904, 571574176)
0 klee 0x08965ab8
[pid 1846] +++ killed by SIGSEGV +++
+++ killed by SIGSEGV +++
Segmentation fault

Using klee on a .bc file also gives me the same result.

I am not sure why i get undefined reference to pthread functions. I am
not sure if the libraries for pthreads are being used properly. Is
there a way to ensure this? Using the llvm-ld also does not help.
Below is the llvm-ld command that i used
llvm-ld tests.bc -l=/usr/lib/libpthread.a

I am not sure why there Segmentation fault occurs. The program works
fine when i normally compile the programs with g++ and run the
executable file.


Could someone tell me where i am going wrong?

Thanks & Regards,
Dilip

[Cristian Cadar]

Hi Dilip,

Currently, KLEE has limited support for C++, and no support for
pthreads. However, there are certain extensions to KLEE that handle
these aspects, e.g., KLOVER for C++ and Cloud9 for pthreads. Take a
look at http://klee.llvm.org/Publications.html for more information.

Cristian

Post by Dilip Murali
Hello Klee developers,
I am a beginner trying to use KLEE.
I am using the KLEE self contained package to on a C++ program that
uses pthreads.
I have generated a .o file and used KLEE with the following option
klee --libc=uclibc --posix-runtime test.o
But i see i get warning
/home/pgbovine/klee/Release+Asserts/lib/libkleeRuntimePOSIX.bca
KLEE: output directory = "klee-out-4"
KLEE: WARNING: undefined reference to function: klee_get_valuel
KLEE: WARNING: undefined reference to function: pthread_create
KLEE: WARNING: undefined reference to function: pthread_exit
KLEE: WARNING: undefined reference to function: pthread_join
KLEE: WARNING: executable has module level assembly (ignoring)
KLEE: WARNING: calling external: syscall(54, 0, 21505, 571522624)
KLEE: WARNING: calling __user_main with extra arguments.
KLEE: WARNING: calling external: pthread_create(571589384, 0,
563903904, 571574176)
0 klee 0x08965ab8
[pid 1846] +++ killed by SIGSEGV +++
+++ killed by SIGSEGV +++
Segmentation fault
Using klee on a .bc file also gives me the same result.
I am not sure why i get undefined reference to pthread functions. I am
not sure if the libraries for pthreads are being used properly. Is
there a way to ensure this? Using the llvm-ld also does not help.
Below is the llvm-ld command that i used
llvm-ld tests.bc -l=/usr/lib/libpthread.a
I am not sure why there Segmentation fault occurs. The program works
fine when i normally compile the programs with g++ and run the
executable file.
Could someone tell me where i am going wrong?
Thanks & Regards,
Dilip
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