Bus Error (Core Dump) when yappi.start()

[GoogleCodeExporter]

What steps will reproduce the problem?
1.import yappi
2.yappi.start()

What is the expected output? What do you see instead?
Python 2.7.2 (default, Oct  3 2011, 00:08:07)
[GCC 3.4.3 (csl-sol210-3_4-branch+sol_rpath)] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> import yappi
>>> yappi.start()
Bus Error (core dumped)

What version of the product are you using? On what operating system?
yappi0.9.3
SunOS autoscape-1 5.10 Generic_147440-01 sun4v sparc SUNW,Netra-T5440

Please provide any additional information below.
gdb traces:

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This GDB was configured as "sparc-sun-solaris"...
Starting program: /usr/local/bin/python ./Session.py -t pass_test 
--settings=dryrun=1,parallel_te=no
warning: Temporarily disabling breakpoints for unloaded shared library 
"/usr/lib/ld.so.1"
warning: Lowest section in /lib/libdl.so.1 is .hash at 00000094
warning: Lowest section in /lib/libpthread.so.1 is .dynamic at 00000074

Program received signal SIGSEGV, Segmentation fault.
0xfe764a30 in screate (size=100) at callstack.c:30
30              cs->_items[i].t0 = 0;
(gdb) bt
#0  0xfe764a30 in screate (size=100) at callstack.c:30
#1  0xfe762af8 in _profile_thread (ts=0x1aeb78) at _yappi.c:160
#2  0xfe763590 in _start () at _yappi.c:801
#3  0xfe763ce4 in start (self=0x0, args=0x1aeb78) at _yappi.c:1118
#4  0x00129f38 in PyCFunction_Call (func=0x6b75a8, arg=0x8f5af8, kw=0x0) at 
Objects/methodobject.c:116
#5  0x000ba54c in PyEval_EvalFrameEx (f=0x63d590, throwflag=-4196768) at 
Python/ceval.c:4013
#6  0x000bc488 in PyEval_EvalCodeEx (co=0x6b5b18, globals=0x1, locals=0x6b4d74, 
args=0x2f9ce4, argcount=0, kws=0x8,
    kwcount=0, defs=0x6d77bc, defcount=2, closure=0x0) at Python/ceval.c:3253
#7  0x000ba4d4 in PyEval_EvalFrameEx (f=0x2f9ba8, throwflag=-4196312) at 
Python/ceval.c:4108
#8  0x000bc488 in PyEval_EvalCodeEx (co=0x2ca068, globals=0x1, locals=0x30ac9c, 
args=0x0, argcount=0, kws=0x0,
    kwcount=0, defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:3253
#9  0x000bc650 in PyEval_EvalCode (co=0x2ca068, globals=0x1e0660, 
locals=0x1e0660) at Python/ceval.c:667
#10 0x000e29e4 in PyRun_FileExFlags (fp=0x0, filename=0xffbffd0a 
"./Session.py", start=1751040, globals=0x1e0660,
    locals=0x1e0660, closeit=1, flags=0xffbffb0c) at Python/pythonrun.c:1346
#11 0x000e3bf4 in PyRun_SimpleFileExFlags (fp=0x1ae770, filename=0xffbffd0a 
"./Session.py", closeit=1, flags=0xffbffb0c)
    at Python/pythonrun.c:936
#12 0x00020d54 in Py_Main (argc=-1, argv=0xffbffc1c) at Modules/main.c:599
#13 0x00020090 in _start ()

Original issue reported on code.google.com by kevin.li...@gmail.com on 23 Dec 2014 at 3:31

[GoogleCodeExporter]

Original comment by sum...@gmail.com on 24 Dec 2014 at 8:40

• Changed state: Accepted

[GoogleCodeExporter]

Hi Kevin,

This is an interesting bug. I cannot simply identify the problem by just 
looking at the source. Below is the code we are failing:

    cs->_items = ymalloc(size * sizeof(_cstackitem));
    if (cs->_items == NULL) {
        yfree(cs);
        return NULL;
    }

    for(i=0; i<size; i++) {
        cs->_items[i].ckey = 0;
        cs->_items[i].t0 = 0; --> Here we fail.
    }

The cstackitem is defined as following:
typedef struct {
    long long t0;
    void *ckey;
} _cstackitem;

Can you tell me the size of a sizeof(long long) on your system? I am trying to 
understand what is different for your OS/Cpu that leads to this error?

Original comment by sum...@gmail.com on 24 Dec 2014 at 8:46

[GoogleCodeExporter]

This might be an issue with the compiler.

That is an old one(GCC 3.4.3) which has a history of misaligment errors. There 
we can try two things:

1) Simply, we can try this with a newer compiler.
2) Or change the long long in the _cstackitem structure to (long) and 
re-compile yappi to see if this fixes the current problem. 

Original comment by sum...@gmail.com on 24 Dec 2014 at 9:09

[GoogleCodeExporter]

Thanks for the respons and I will try have a try and get back.

Kevin

Original comment by kevin.li...@gmail.com on 30 Dec 2014 at 1:29