SIGSEGV at df_ref_record()

[Jeff Law]

On 04/13/2015 10:51 AM, ftwilliam wrote:
> Hi,
>
> I am getting SIGSEGV in df_ref_record() while building libgcc using:
> ../gcc-repo/configure --target=myarch-elf --enable-languages=c
>
> Below is the GDB backtrace, and attached is the patch against trunk.
>
> I want to debug this myself, but can I get pointers on how I can debug
> this issue ?
>
>
>
> Program received signal SIGSEGV, Segmentation fault.
> df_ref_record (cl=cl@entry=DF_REF_ARTIFICIAL,
> collection_rec=collection_rec@entry=0xbff21a10, reg=0xafafafaf,
Note the value of "reg".

That looks like you're referencing bits of memory that have been garbage 
collected.

I'd go up in the call chain to see where that value comes from.

jeff