On 01/04, Oleg Nesterov wrote:
>
> IOW. I think this problem is minor and probably can be ignored,
Or may be not...
Even if the child is not killed by SIGTRAP, it can get a lot of
unnecessary traps.
To verify, I did another trivial patch (below), and the test
case from 6580807da14c423f0d0a708108e6df6ebc8bc83d does trigger
a lot of "false step" printks.
Hmm. And sometimes there is nothing in dmesg, but the test-case
needs a lot of time to complete. "taskset -c" seems to always
trigger printk's. Magic.
Oleg.
--- arch/s390/kernel/traps.c~ 2009-12-22 10:41:52.909174198 -0500
+++ arch/s390/kernel/traps.c 2010-01-04 13:19:51.038187586 -0500
@@ -384,6 +384,8 @@ void __kprobes do_single_step(struct pt_
}
if (tracehook_consider_fatal_signal(current, SIGTRAP))
force_sig(SIGTRAP, current);
+ else
+ printk("false step\n");
}
static void default_trap_handler(struct pt_regs * regs, long interruption_code)
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