On 11/26, Jan Kratochvil wrote:
On Thu, 30 Oct 2014 22:55:41 +0100, Mark Wielaard wrote:
> On Thu, 2014-10-09 at 23:25 +0200, Jan Kratochvil wrote:
> > + if (opt_core_pattern == true && show_one_tid == false)
> > + argp_error (state,
> > + N_("--core-pattern requires -1"));
>
> Why this restriction?
I was blindly following Oleg's note which was not so obvious to me, though:
On Wed, 03 Sep 2014 16:26:41 +0200, Oleg Nesterov wrote:
# Obviously, this way you can only inspect the thread which dumps the core.
Therefore I have now tried to remove this limitation of
-1 Show the backtrace of only one thread
But I have found the other threads end up with:
wait4(13902, [{WIFSIGNALED(s) && WTERMSIG(s) == SIGSEGV &&
WCOREDUMP(s)}], __WALL, NULL) = 13902
Therefore they are dead at the core_pattern time, they cannot be ptraced and
therefore they cannot be unwound.
Yes. I guess PTRACE_ATTACH should work but it is pointless, this
thread can't report an event and other ptrace requests won't work.
In fact I think PTRACE_ATTACH should fail in this case...
Oleg.