linux-kernel - Re: genirq: Flags mismatch irq 4. 00000000 (serial) vs. 00000080 (goldfish_pdev

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Date:	Mon, 4 Apr 2016 09:55:10 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Dmitry Vyukov <dvyukov@...gle.com>, devel@...verdev.osuosl.org,
	arve@...gle.com, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: genirq: Flags mismatch irq 4. 00000000 (serial) vs. 00000080
 (goldfish_pdev_bus)

On 04/02/2016, 12:35 PM, Dmitry Vyukov wrote:
> Hello,
> 
> After updating from 8e0f93cda48ed054e1216bab5c60017e1a5fc1e8 to
> 05cf8077e54b20dddb756eaa26f3aeb5c38dd3cf (Apr 1) I've started seeing
> the following warnings:
> 
> genirq: Flags mismatch irq 4. 00000000 (serial) vs. 00000080 (goldfish_pdev_bus)
> CPU: 3 PID: 6626 Comm: init Tainted: G        W       4.6.0-rc1+ #338
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
>  ffffffff87eb26a0 ffff88003da17618 ffffffff82c8ea9f ffffffff86f0c740
>  fffffbfff0fd64d4 ffff88003e8a6aa8 ffff88005eb4c4c8 00000000fffffff0
>  ffffffff874f6be0 ffff880034ae63a8 ffff88003da17708 ffffffff8149e73c
> Call Trace:
>  [<     inline     >] __dump_stack lib/dump_stack.c:15
>  [<ffffffff82c8ea9f>] dump_stack+0x12e/0x18f lib/dump_stack.c:51
>  [<ffffffff8149e73c>] __setup_irq+0x11fc/0x1610 kernel/irq/manage.c:1369
>  [<ffffffff8149ef55>] request_threaded_irq+0x275/0x410 kernel/irq/manage.c:1652
>  [<     inline     >] request_irq include/linux/interrupt.h:147
...
> They appear after boot every 10 seconds.
> I am using qemu. Here are GOLDFISH related .config values:
> 
> CONFIG_GOLDFISH=y
> # CONFIG_X86_GOLDFISH is not set
> CONFIG_KEYBOARD_GOLDFISH_EVENTS=y
> CONFIG_GOLDFISH_TTY=y
> CONFIG_BATTERY_GOLDFISH=y
> CONFIG_FB_GOLDFISH=y
> CONFIG_MMC_GOLDFISH=y
> CONFIG_GOLDFISH_AUDIO=y
> CONFIG_MTD_GOLDFISH_NAND=y
> CONFIG_GOLDFISH_BUS=y
> CONFIG_GOLDFISH_PIPE=y
> 
> Is it a known issue? How can it be fixed?

This is a conflict between request_irq of goldfish and 8250. Setting
SERIAL_8250_SHARE_IRQ (which is the default) should make the trace gone.
Note that GOLDFISH=y makes sense only if you build a goldfish kernel.
I.e. setting both 8250 and goldfish does not make much sense IIRC.

thanks,
-- 
js
suse labs