Geert,
On Oct 3, 2012, at 10:00 PM, Geert Uytterhoeven wrote:
>> I'm still looking for the conditions it takes to have something like
>> show_registers() in arch/m68k/kernel/traps.c called when the trap occurs.
>
> The registers are only printed for exceptions caused in kernel mode.
The print-fatal-signals kernel parameter can be enabled which is consulted by
get_signal_to_deliver() in kernel/signal.c to decide whether to dump registers:
> if (sig_kernel_coredump(signr)) {
> if (print_fatal_signals)
> print_fatal_signal(regs, info->si_signo);
> /*
> * If it was able to dump core, this kills all
> * other threads in the group and synchronizes with
> * their demise. If we lost the race with another
> * thread getting here, it set group_exit_code
> * first and our do_group_exit call below will use
> * that value and ignore the one we pass it.
> */
> do_coredump(info->si_signo, info->si_signo, regs);
> }
>From Documentation/kernel-parameters.txt:
> print-fatal-signals=
> [KNL] debug: print fatal signals
>
> If enabled, warn about various signal handling
> related application anomalies: too many signals,
> too many POSIX.1 timers, fatal signals causing a
> coredump - etc.
>
> If you hit the warning due to signal overflow,
> you might want to try "ulimit -i unlimited".
>
> default: off.
Tomorrow I will find out if this will produce what I am looking for.
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 --
> ge...@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like
> that.
> -- Linus Torvalds
Larry Baker
US Geological Survey
650-329-5608
ba...@usgs.gov
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