Debugging ICE in GCC

Dan Kegel dank@kegel.com
Sat May 30 02:01:39 GMT 2020


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95090 looks sorted, did you
figure out your gdb question?

On Fri, May 29, 2020, 16:55 Manfred Schwarb <manfred99@gmx.ch> wrote:

> Hi,
> I tried to debug fortran.dg/pr95090.f90, which showed
>
> f951: internal compiler error: Segmentation fault
> 0x83cfe3c ???
>         ../sysdeps/i386/start.S:117
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.
>
>
> Using GDB (8.3.1), I got
> #> f951="`$instdir/bin/gcc -print-prog-name=f951`"
> #> gdb -ex run -ex bt --batch --args $f951 fortran.dg/pr95090.f90
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xf7aa5162 in __strlen_sse2_bsf () from /lib/libc.so.6
> #0  0xf7aa5162 in __strlen_sse2_bsf () from /lib/libc.so.6
> #1  0x083e7c3f in get_unique_hashed_string(char*, gfc_symbol*) ()
> #2  0x083e85a4 in gfc_find_derived_vtab(gfc_symbol*) ()
> #3  0x0847fde1 in resolve_fl_derived(gfc_symbol*) ()
> #4  0x0847c717 in resolve_symbol(gfc_symbol*) ()
> #5  0x084a78d0 in do_traverse_symtree(gfc_symtree*, void
> (*)(gfc_symtree*), void (*)(gfc_symbol*)) ()
> #6  0x08487f77 in resolve_types(gfc_namespace*) ()
> #7  0x0847b6e5 in gfc_resolve(gfc_namespace*) ()
> #8  0x0846e9f6 in gfc_parse_file() ()
> #9  0x084bebe7 in gfc_be_parse_file() ()
> #10 0x08a3b59e in compile_file() ()
> #11 0x083c98a5 in toplev::main(int, char**) ()
> #12 0x083cd9b1 in main ()
>
>
> So far so good, but there are no file locations shown, and I can't
> switch frames and list code in GDB.
> This although I built GCC with debug information and binaries are not
> stripped.
>
> I built GCC with
> #> ../configure --enable-checking=yes,extra i686-linux
> #> make BOOT_CFLAGS="-O2 -ggdb" bootstrap2-lean
>
> In desperation, I even tried
> #> make BOOT_CFLAGS="-O2 -fanalyzer" bootstrap2-lean
> and
> #> make BOOT_CFLAGS="-O2 -fsanitize=address" bootstrap2-lean
> but both compilation attempts failed.
>
>
> Are there any magic knobs to make GDB output more useful?
>
> Thanks,
> Manfred
>
>
>


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