Am Dienstag, den 27.02.2018, 08:26 +0100 schrieb Marek Szyprowski:

Hi,

I've noticed that USBnet/ASIX AX88772B USB driver produces deplock kernel
warning ("inconsistent lock state") on Chromebook2 Peach-PIT board. No

Is that 32 bit?

special activity is needed to reproduce this issue, it happens almost
on every boot. ASIX USB ethernet is connected to XHCI USB host controller
on that board. Is it a known issue? Frankly I have no idea where to look

No, it is not known.

to fix it. The same adapter connected to EHCI ports on other boards based
on the same SoC works fine without any warnings.

Odd.

And the log with mentioned warning:

[   17.768040] ================================
[   17.772239] WARNING: inconsistent lock state
[   17.776511] 4.16.0-rc3-next-20180227-00007-g876c53a7493c #453 Not tainted
[   17.783329] --------------------------------
[   17.787580] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
[   17.793607] swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
[   17.798751]  (&syncp->seq#5){?.-.}, at: [<9b22e5f0>] 
asix_rx_fixup_internal+0x188/0x288

Looks like this triggers (in usbnet):

        u64_stats_update_begin(&stats64->syncp);
        stats64->rx_packets++;
        stats64->rx_bytes += skb->len;
        u64_stats_update_end(&stats64->syncp);

That I considered to be called under lock.
Could you comment this out for testing?

	Regards
		Oliver