On Fri, Nov 10, 2006 at 09:44:57AM -0800, Nathaniel Rutman wrote:
> For instance, SIGSEGV is thrown all over the place in skas mode; when
> you load a module, etc.
> Masking that in gdb means I miss "real" SIGSEGVs.
>
> Program received signal SIGSEGV, Segmentation fault. 0x08096466 in
> load_module (umod=0x40129008, len=305148, uargs=0x804a050) at
> include/asm/arch/string.h:333
> 333 __asm__ __volatile__(
> (gdb)
> Program received signal SIGSEGV, Segmentation fault.0x08063bd5 in
> copy_chunk_from_user (from=325513224, len=4088, arg=0x157ffb40) at
> include/asm/arch/string.h:202
> 202 __asm__ __volatile__(
If by masking, you mean 'noprint nostop pass', real segfaults will result
in a panic, which you can trap with a breakpoint on panic.
But this has nothing to do with skas vs tt mode that I can think of. UML
in both cases will suffer in-kernel page faults.
Jeff
--
Work email - jdike at linux dot intel dot com
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