[6 Regession] Usage of unitialized pointer io/list_read.c (

[Jerry DeLisle]

On 02/16/2016 05:17 AM, Dominique d'Humières wrote:
> Hi Jerry,
> 
>> Thanks for review. Committed to trunk r233436.
> 
> The test gfortran.dg/read_bang4.f90 fails on x86_64-apple-darwin15:
> 
> a.out(15552,0x7fff7b2e3000) malloc: *** error for object 0x7fb472804c00: pointer being freed was not allocated
> *** set a breakpoint in malloc_error_break to debug
> 
> Program received signal SIGABRT: Process abort signal.
> 
> If I compile the test with -fsanitize=address, I get
> 
> =================================================================
> ==15561==ERROR: AddressSanitizer: attempting double-free on 0x61a00001c280 in thread T0:
>     #0 0x106d1ac40 in wrap_free.part.0 sanitizer_malloc_mac.inc:103
>     #1 0x106c0078f in _gfortrani_list_formatted_read list_read.c:137
>     #2 0x4400000042  (<unknown module>)
> 
> 0x61a00001c280 is located 0 bytes inside of 1200-byte region [0x61a00001c280,0x61a00001c730)
> freed by thread T0 here:
>     #0 0x106d19e09 in wrap_realloc sanitizer_malloc_mac.inc:108
>     #1 0x106b38a14 in _gfortrani_xrealloc memory.c:98
> 
> previously allocated by thread T0 here:
>     #0 0x106d19fe9 in wrap_calloc sanitizer_malloc_mac.inc:114
>     #1 0x106b389d2 in _gfortrani_xcalloc memory.c:84
> 
> SUMMARY: AddressSanitizer: double-free sanitizer_malloc_mac.inc:103 in wrap_free.part.0
> ==15561==ABORTING
> 
> Program received signal SIGABRT: Process abort signal.
> 
> TIA
> 
> Dominique
> 
> 

Up until now we have not had a test case like this for kind=4 testing.  I did
try -fsanitize=address here and do see the same thing.  I will work on this some
more.

Thanks,

Jerry