How to fix SIGBUS on Solaris

Question

I am using atomic_inc_64_nv on 64bit Solaris, returned value is casted to unsigned long. But when I run my app, it crashed and core is claming that the cause of the crash is SIGBUS. I Suspect there are could be alignment issues. How can I fix this problem?

Here is my function which uses increment

    inline unsigned long long Increment64(volatile unsigned long long * pullTarget)
    {
#if defined(LINUX)
        return Add64(pullTarget, 1ULL);
#elif defined(SOLARIS)
        return atomic_inc_64_nv((volatile unsigned long *)pullTarget) - 1ULL;
#elif defined(WIN32)
        return (unsigned long long)InterlockedIncrement64((LONGLONG volatile*)(pullTarget)) - 1ULL;
#endif // defined(LINUX)
    }

Thank you on advance.

Did you try a debugger? Without code it will be hard to help you. Please provide a [SSCCE](http://sscce.org). — Carl Norum, Dec 23 '12 at 17:10

score 4 · Accepted Answer · answered Dec 23 '12 at 17:59

Sparc processors do not support unaligned access. You need to make sure your pullTarget is aligned to 8 bytes. You can add some code like this to catch it:

if ((uint_ptr)pullTarget & 7) { printf("Alignment problem pullTarget = %p\n", pullTarget); }

score 2 · Answer 2 · answered Dec 23 '12 at 18:11

2

As you have a core and have opened it in the debugger, now simply print the value contained in the variable pullTarget. (The pointer value itself, not what it points to.) You should see that it is not divisible by 8, as @MatsPetersson is correct on the cause.

answered Dec 23 '12 at 18:11

Matthew Lundberg

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And most likely the bug will be in whatever called this function. – David Schwartz Dec 23 '12 at 18:32

How to fix SIGBUS on Solaris

2 Answers2