topic Re: Segmentation fault, dlopen ,aCC -AA -Ae in Operating System - HP-UX

Segmentation fault, dlopen ,aCC -AA -Ae

ciwoo — Mon, 24 Aug 2009 07:40:30 GMT

machime platform：
ia64 HP-UX B.11.23

problem：
when program 'A' use dlopen function to load library 'B', program 'A' may crash

scene description ：
program 'A' use dlopen to load dynamic library "B', and "A" and "B" is correct in syntax and

logic,and 'A' is compiled by C language ,and 'B' is complied by C++ language

'A' compile parameter is：
aCC -o A.out -Ae -g +DD64 -mt -dynamic -ldl -lpthread

'B' compile parameter is：
aCC -o B.so -AA -b -mt -Wl,+s -Wl,+vnocompatwarnings +DD64 +Olit=all -Wl,-hsqlca,+allowdups

-w -lunwind -lCsup -lstd_v2

'A" used (aCC -Ae)，"B" used (aCC-AA)

print stack as below：

Program terminated with signal 11, Segmentation fault.
SEGV_MAPERR - Address not mapped to object

#0 0xc0000000000e7560:0 in pthread_mutex_destroy+0xc0 ()
from /usr/lib/hpux64/libpthread.so.1
(gdb) where
#0 0xc0000000000e7560:0 in pthread_mutex_destroy+0xc0 ()
from /usr/lib/hpux64/libpthread.so.1
#1 0xc000000000357de0:0 in __thread_mutex_free+0xc0 ()
from /usr/lib/hpux64/libc.so.1
#2 0xc00000000233f370:0 in _HPMutexWrapper::~_HPMutexWrapper()+0xd0 ()
from /usr/lib/hpux64/libstd_v2.so.1
#3 0xc000000006eda1e0:0 in std::basic_streambuf

>::~basic_streambuf () at EIClass.cpp:1
#4 0xc000000006eb6980:0 in

std::basic_stringstream,std::allocator

>::~basic_stringstream ()
at /opt/aCC/include_std/sstream:74
#5 0xc000000006ec8690:0 in EIClass::GetColVal () at EIClass.cpp:1441 //-----------------------> user

function

This problem happened in EIClass::GetColVal () return function，
snippet displayed as below

int EIClass::GetColVal (){

...
...

return 0; //-----------------------> coredump happen
}

Re: Segmentation fault, dlopen ,aCC -AA -Ae

Dennis Handly — Mon, 22 Aug 2011 03:39:32 GMT

>aCC -Ae -g +DD64 -mt -dynamic -ldl -lpthread

You should NOT be using "aCC -Ae". Instead use cc. You don't need -lpthread since you have -mt. Also you shouldn't use -dynamic since it is the default.

>aCC -AA -b -mt -Wl,+s -Wl,+vnocompatwarnings +DD64 +Olit=all -Wl,-hsqlca,+allowdups

+Olit=all is the default, you don't need this.
-Wl,-hsqlca,+allowdups should be split into two ld options: -Wl,-hsqlca -Wl,+allowdups
Why do you have the latter? Any duplicates violate the ODR rule and are illegal.

>-lunwind -lCsup -lstd_v2

This is illegal and doesn't match what's documented for plugins.
http://docs.hp.com/en/14487/distributing.htm#linking
The order is: -lstd_v2 -lCsup -lunwind -lm

This may be the cause. Also have you compiled everything with -mt?

You shouldn't use -w but suppress individual warnings with +Wnnnn.

Re: Segmentation fault, dlopen ,aCC -AA -Ae

ciwoo — Mon, 24 Aug 2009 09:51:21 GMT

thanks, i will try it.

Re: Segmentation fault, dlopen ,aCC -AA -Ae

ciwoo — Mon, 24 Aug 2009 10:28:11 GMT

hello Dennis Handly:
I have a question.

Does it have any problem when a 'C'program call 'C++' shared library with dlopen,
can you give me some suggestions or show me more relalted information, thank you very much.

Re: Segmentation fault, dlopen ,aCC -AA -Ae

Dennis Handly — Tue, 25 Aug 2009 01:49:40 GMT

>Does it have any problem when a C program call aC++ shared library with dlopen, can you give me some suggestions or show me more related information.

It shouldn't. The URL I provided above shows how to link an aC++ shlib for a plugin.