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Re: gdbstub initial code, v8 && ptrace
On 09/06, Oleg Nesterov wrote:
> OK, I am stupid. Indeed, say, "return UTRACE_STOP | UTRACE_SIGNAL_IGN"
> from under "case UTRACE_SIGNAL_REPORT" changes utrace_report->result,
> and confuses other tracers.
> Probably we can ignore ptrace, but this also means ugdb conflicts
> with itself and should be fixed.
I am a bit confused... OK, ugdb is wrong wrt multitracing.
UTRACE_SIGNAL_REPORT case shouldn't return "UTRACE_STOP | UTRACE_SIGNAL_IGN",
it should return "UTRACE_STOP | UTRACE_SIGNAL_REPORT" to keep report->result.
But it needs to return UTRACE_SIGNAL_DELIVER?
Probably we can check orig_ka != NULL and treat orig_ka == NULL as
UTRACE_SIGNAL_REPORT. Hopefully this can't be confused with
Not sure about UTRACE_SIGNAL_HOLD, but this is very unlikely race.
I need to re-read utrace_get_signal() with a fresh head.