I have a lot of crash during wifi networks scan.
How to understanding the reason of crash and crash point?
I know that I have a bug in my program. But can not find it because too much code.

Guru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory region accessed)
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40150c94: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInGuru Meditation Error: Core 1 panic'ed (Unhandled debug exception)
Debug exception reason: Stack canary watchpoint triggered ()
Guru Meditation Error: Core 1 panic'ed (Guru Meditation Error: Core 1 panic'ed (Double exception)

@ajb2k3 No error. Interrupt functions gpio17 does not called

PS I build sketch with "Debug off" but with "Debug: Serial" same problem, Function does not called
PPS GPIO 17 works ok if I remove FaceKit and use M5Stack GRAY separately. So, as I understand it is hardware problem of FaceKit only.

void gpio17(  )
{
  Serial.println( "gpio17" );
}
void setup( )
{
	M5.begin( true, false, false, true );
	Wire.begin();

	pinMode( KEYBOARD_INT, INPUT_PULLUP );

	pinMode( 17, INPUT );
	attachInterrupt( digitalPinToInterrupt( 17 ), gpio17, RISING );
}

I send signal but nothing.
M5Stack BASIC Kit GPIO17 works correct

I need 5 digital channels for my project.
I tried use GPIO03, GPIO01, GPIO16, GPIO17 but unsuccessful
or apprication crashed at random time or no signal reading

I want use Back Buffer for drawing my scene.
I want draw all scene to BB and after that draw BB to screen.
With BB I will have no blink effect. And can redraw all screen each frame.
How to create BB and use it? I did not found API for that

II have same problem. Date is 2018.3 on board