Segmentation fault at global variable initialization in shared library

Question

I have a shared library that contains global variable

    int ***carg;

This variable is initialized at function

    __attribute__((constructor)) void init(void) {
        carg = generator->get_carg();
    }

where

    int*** get_carg();

just returns preinitialized carg array.

If this library is loading there is segmentation fault

Program received signal SIGSEGV, Segmentation fault. 0x00007fffebe05fea in init () at /path/to/project/main.cpp:814

In this frame

    (gdb) print carg
    $1 = (int ***) 0x0
    (gdb) call generator->get_carg()
    $2 = (int ***) 0xf12410

Why this assignment (one pointer is assigned to other pointer) is the cause of segmentation fault? And how can I initialize this variable?

UPD: I still don't know answer, but when carg variable was renamed, there is no errors. I thought that there is one more variable with this name, but that's not so.

sth · Accepted Answer · 2013-04-21 10:49:22Z

1

Probably the generator variable is not initialized yet and doesn't point to a valid object.

Calling get_cargs() then results in a segmentation fault.

answered Apr 21, 2013 at 10:49

sth

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1 Comment

erthalion Over a year ago

No, get_cargs() it's ok, because in this frame (gdb) print generator->get_carg()[0][0][0] is working. It's surprisingly for me that I can (gdb) call generator->get_cargs() (gdb) $5 (gdb) set carg = $ and there is no errors

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