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Date:   Fri, 1 May 2020 12:17:21 +0530
From:   Allen <allen.pais@...cle.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: Net: [DSA]: dsa-loop kernel panic

Andrew,
> 
> Can you reproduce it? If so, could you do:
> 
> make net/core/dev.lst

Yes. Attached is the file.

ffff8000113adb60 <__dev_set_rx_mode>:
{
ffff8000113adb60:	a9bd7bfd 	stp	x29, x30, [sp,#-48]!
ffff8000113adb64:	910003fd 	mov	x29, sp
ffff8000113adb68:	a90153f3 	stp	x19, x20, [sp,#16]
ffff8000113adb6c:	f90013f5 	str	x21, [sp,#32]
ffff8000113adb70:	aa0003f3 	mov	x19, x0
ffff8000113adb74:	aa1e03e0 	mov	x0, x30
ffff8000113adb78:	94000000 	bl	0 <_mcount>
			ffff8000113adb78: R_AARCH64_CALL26	_mcount
	if (!(dev->flags&IFF_UP))
ffff8000113adb7c:	b9422a60 	ldr	w0, [x19,#552]
	const struct net_device_ops *ops = dev->netdev_ops;
ffff8000113adb80:	f940fa74 	ldr	x20, [x19,#496]
	if (!(dev->flags&IFF_UP))
ffff8000113adb84:	360001a0 	tbz	w0, #0, ffff8000113adbb8 
<__dev_set_rx_mode+0x58>
ffff8000113adb88:	f9402260 	ldr	x0, [x19,#64]
	if (!netif_device_present(dev))
ffff8000113adb8c:	36080160 	tbz	w0, #1, ffff8000113adbb8 
<__dev_set_rx_mode+0x58>
	if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
ffff8000113adb90:	b9422e60 	ldr	w0, [x19,#556]
ffff8000113adb94:	376000a0 	tbnz	w0, #12, ffff8000113adba8 
<__dev_set_rx_mode+0x48>
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
ffff8000113adb98:	b9429275 	ldr	w21, [x19,#656]
ffff8000113adb9c:	35000175 	cbnz	w21, ffff8000113adbc8 
<__dev_set_rx_mode+0x68>
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
ffff8000113adba0:	3949f660 	ldrb	w0, [x19,#637]
ffff8000113adba4:	35000220 	cbnz	w0, ffff8000113adbe8 
<__dev_set_rx_mode+0x88>
	if (ops->ndo_set_rx_mode)
ffff8000113adba8:	f9402281 	ldr	x1, [x20,#64]
ffff8000113adbac:	b4000061 	cbz	x1, ffff8000113adbb8 
<__dev_set_rx_mode+0x58>
		ops->ndo_set_rx_mode(dev);
ffff8000113adbb0:	aa1303e0 	mov	x0, x19
ffff8000113adbb4:	d63f0020 	blr	x1
}
ffff8000113adbb8:	a94153f3 	ldp	x19, x20, [sp,#16]
ffff8000113adbbc:	f94013f5 	ldr	x21, [sp,#32]
ffff8000113adbc0:	a8c37bfd 	ldp	x29, x30, [sp],#48
ffff8000113adbc4:	d65f03c0 	ret
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
ffff8000113adbc8:	3949f662 	ldrb	w2, [x19,#637]
ffff8000113adbcc:	35fffee2 	cbnz	w2, ffff8000113adba8 
<__dev_set_rx_mode+0x48>
			__dev_set_promiscuity(dev, 1, false);
ffff8000113adbd0:	aa1303e0 	mov	x0, x19
ffff8000113adbd4:	52800021 	mov	w1, #0x1                   	// #1
ffff8000113adbd8:	97ffff6a 	bl	ffff8000113ad980 <__dev_set_promiscuity>
			dev->uc_promisc = true;
ffff8000113adbdc:	52800020 	mov	w0, #0x1                   	// #1
ffff8000113adbe0:	3909f660 	strb	w0, [x19,#637]
ffff8000113adbe4:	17fffff1 	b	ffff8000113adba8 <__dev_set_rx_mode+0x48>
			__dev_set_promiscuity(dev, -1, false);
ffff8000113adbe8:	aa1303e0 	mov	x0, x19
ffff8000113adbec:	12800001 	mov	w1, #0xffffffff            	// #-1
ffff8000113adbf0:	2a1503e2 	mov	w2, w21
ffff8000113adbf4:	97ffff63 	bl	ffff8000113ad980 <__dev_set_promiscuity>
			dev->uc_promisc = false;
ffff8000113adbf8:	3909f675 	strb	w21, [x19,#637]
ffff8000113adbfc:	17ffffeb 	b	ffff8000113adba8 <__dev_set_rx_mode+0x48>


> and then show us the listing for __dev_set_rx_mode. The instructions
> around 0x48/0xa0 will tell us what structure is a NULL pointer.
> 
> For this to work, it is important the build to create the .lst file is
> the same as the build which fails. Changing the kernel configuration,
> compiler flags etc can change 0x48/0xa0.

- Allen

View attachment "dev.lst" of type "text/plain" (1432037 bytes)

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