Potential BUG_ON() in do_group_exit() on 4.17.2

[Georgi Guninski <guninski@xxxxxxxxxxxx>]

Does this BUG_ON() gets hit on mips?

in 4.17.2 ./kernel/exit.c

do_group_exit(int exit_code)
{
	struct signal_struct *sig = current->signal;

	BUG_ON(exit_code & 0x80);

|do_group_exit| is called from

./kernel/signal.c:2482:		do_group_exit(ksig->info.si_signo);

Appears to me si_signo can be 0x80 (in decimal 128) because of:

arch/mips/include/uapi/asm/signal.h:15:#define _NSIG		128

Probably testcase will be:
$kill -128 `pidof program`