------- Comment #9 from ro at CeBiTec dot Uni-Bielefeld dot DE 2010-01-12
12:08 -------
Subject: Re: 64-bit null_pointer_deref1 gnat.dg test consumes all available
memory
> ------- Comment #1 from ebotcazou at gcc dot gnu dot org 2009-11-03 18:49
> -------
> Somewhat expected, see the comment in the test. A patch to disable it on this
> platform (sparc*-*-solaris2.11) is pre-approved.
I've just installed that since the bug hit me again and I've not yet
succeeded in the investigation.
> The failure very likely means that the 64-bit pattern matching code of the
> fallback routine in config/sparc/sol2-unwind.h misbehaves for Solaris 11.
> Unfortunately, I don't have access to any Solaris 11 machine so I cannot fix.
I've checked __sighndlr in the Solaris 11 64-bit libc.so.1 against
sol2-unwind.h (sighndlr_pattern), and they are identical.
> To debug this, you need to recompile libgcc at -O0 -g and put a breakpoint on
> sparc64_fallback_frame_state from within the debugger; it will be hit once you
> resume execution after the SIGSEGV. What happens from that on?
Unfortunately, it doesn't hit:
(gdb) b sparc64_fallback_frame_state
Breakpoint 1 at 0x100017c88: file
/vol/gcc/src/hg/trunk/solaris/libgcc/../gcc/config/sparc/sol2-unwind.h, line
38.
(gdb) run
Starting program:
/vol/gcc/obj/gcc-4.5.0-20100107/11-gcc/gcc/testsuite/gnat/null_pointer_deref1.exe
[Thread debugging using libthread_db enabled]
[New Thread 1 (LWP 1)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1 (LWP 1)]
0x00000001000141b0 in _ada_null_pointer_deref1 ()
(gdb) cont
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x7fffffff7f8c81d0 in kill () from /lib/64/libc.so.1
(gdb) cont
Continuing.
procfs: couldn't find pid -1 in procinfo list.
So I'm sort of stuck. dbx doesn't allow me to set a breakpoint in
sparc64_fallback_frame_state at all.
Rainer
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41929
