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I've bought a new 3B+ and when I add dtdebug=1 to config.txt in /boot the following shows up in dmesg. I'm also having a problem where a GPIO extension board isn't being picked up at all, is this related? If not, is it still something to worry about?

I'm running a custom and patched kernel for realtime capabilities. Here's the config: https://pastebin.com/8DWKTFYL

[   10.090653] ------------[ cut here ]------------
[   10.090688] WARNING: CPU: 3 PID: 73 at kernel/irq/handle.c:151 __handle_irq_event_percpu+0x2a4/0x2c4
[   10.090701] irq 169 handler irq_default_primary_handler+0x0/0x1c enabled interrupts
[   10.090708] Modules linked in: 8021q garp stp llc brcmfmac brcmutil cfg80211 rfkill snd_soc_wm8804_i2c uio_pdrv_genirq uio fixed ip_tables x_tables ipv6
[   10.090770] CPU: 3 PID: 73 Comm: irq/62-dwc_otg_ Not tainted 4.14.91-rt49-v7+ #1
[   10.090773] Hardware name: BCM2835
[   10.090800] [<80110ee4>] (unwind_backtrace) from [<8010bda4>] (show_stack+0x20/0x24)
[   10.090818] [<8010bda4>] (show_stack) from [<8083f5d8>] (dump_stack+0xc8/0x114)
[   10.090838] [<8083f5d8>] (dump_stack) from [<80122360>] (__warn+0xe4/0x110)
[   10.090854] [<80122360>] (__warn) from [<801223d4>] (warn_slowpath_fmt+0x48/0x50)
[   10.090868] [<801223d4>] (warn_slowpath_fmt) from [<8017e510>] (__handle_irq_event_percpu+0x2a4/0x2c4)
[   10.090882] [<8017e510>] (__handle_irq_event_percpu) from [<8017e584>] (handle_irq_event_percpu+0x54/0x94)
[   10.090895] [<8017e584>] (handle_irq_event_percpu) from [<8017e640>] (handle_irq_event+0x7c/0xc0)
[   10.090908] [<8017e640>] (handle_irq_event) from [<80181f7c>] (handle_simple_irq+0x98/0x11c)
[   10.090923] [<80181f7c>] (handle_simple_irq) from [<8017d428>] (generic_handle_irq+0x30/0x44)
[   10.090939] [<8017d428>] (generic_handle_irq) from [<805d8650>] (intr_complete+0xf4/0x124)
[   10.090959] [<805d8650>] (intr_complete) from [<805e98f0>] (__usb_hcd_giveback_urb+0x78/0x110)
[   10.090976] [<805e98f0>] (__usb_hcd_giveback_urb) from [<805e99d8>] (usb_hcd_giveback_urb+0x50/0x120)
[   10.090993] [<805e99d8>] (usb_hcd_giveback_urb) from [<80613b98>] (completion_tasklet_func+0x6c/0x98)
[   10.091009] [<80613b98>] (completion_tasklet_func) from [<80622b70>] (tasklet_callback+0x20/0x24)
[   10.091025] [<80622b70>] (tasklet_callback) from [<801286c8>] (__tasklet_action+0x6c/0x140)
[   10.091042] [<801286c8>] (__tasklet_action) from [<80128824>] (tasklet_hi_action+0x88/0x9c)
[   10.091059] [<80128824>] (tasklet_hi_action) from [<8012819c>] (do_current_softirqs+0x208/0x468)
[   10.091076] [<8012819c>] (do_current_softirqs) from [<80128494>] (__local_bh_enable+0x98/0xb4)
[   10.091091] [<80128494>] (__local_bh_enable) from [<8017f8d8>] (irq_forced_thread_fn+0x58/0x8c)
[   10.091104] [<8017f8d8>] (irq_forced_thread_fn) from [<8017fbb0>] (irq_thread+0x128/0x1e4)
[   10.091117] [<8017fbb0>] (irq_thread) from [<80142c88>] (kthread+0x134/0x170)
[   10.091132] [<80142c88>] (kthread) from [<80107c94>] (ret_from_fork+0x14/0x20)
[   10.091138] ---[ end trace 0000000000000002 ]---

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