linux-kernel - Re: Badness at mm/backing-dev.c:179

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Message-ID: <Pine.LNX.4.64.0812080915120.14941@anakin>
Date:	Mon, 8 Dec 2008 09:16:37 +0100 (CET)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Kay Sievers <kay.sievers@...y.org>
cc:	Mark Jackson <mpfj@...c.co.uk>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Woodhouse <dwmw2@...radead.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: Badness at mm/backing-dev.c:179

On Wed, 3 Dec 2008, Kay Sievers wrote:
> On Wed, Dec 3, 2008 at 13:07, Mark Jackson <mpfj@...c.co.uk> wrote:
> > The following commit causes a "Badness at mm/backing-dev.c:179":-
> >
> > f1d0b063d993527754f062c589b73f125024d216 is first bad commit
> > commit f1d0b063d993527754f062c589b73f125024d216
> > Author: Kay Sievers <kay.sievers@...y.org>
> > Date:   Tue Dec 2 10:31:50 2008 -0800
> >
> >    bdi: register sysfs bdi device only once per queue
> 
> > Below is the extract from dmesg:-
> >
> > ------------[ cut here ]------------
> > Badness at mm/backing-dev.c:179
> 
> That's a known issue, and will not cause any harm besides printing
> this warning. Andrew added the warning to catch drivers who use one
> single request queue for multiple devices. Currently known are mtd and
> floppy (triggers only if you have more than one device per driver).
> The drivers need to be changed to use a separate queue per device, to
> get rid of this warning.

I guess this one (introduced after 2.6.28-rc7) is an incarnation of the same
issue?

WARNING: at mm/backing-dev.c:179 0x2069cb()
Modules linked in:
Call Trace: [<000273ee>] warn_on_slowpath+0x44/0x60
 [<001be5b0>] mutex_lock+0x0/0x24
 [<00075d1e>] ifind+0x16/0x5c
 [<000a0844>] sysfs_ilookup_test+0x0/0x18
 [<00075d92>] ilookup5+0x2e/0x38
 [<000a0e70>] sysfs_addrm_finish+0x1c/0x200
 [<000a047e>] sysfs_create_file+0x0/0x44
 [<000a0432>] sysfs_add_file_mode+0x5a/0x84
 [<000efc5a>] kobject_uevent_env+0x46/0x30c
 [<000a047e>] sysfs_create_file+0x0/0x44
 [<000a0478>] sysfs_add_file+0x1c/0x22
 [<000eff30>] kobject_uevent+0x10/0x16
 [<000e1332>] elv_register_queue+0x64/0x6e
 [<000eff20>] kobject_uevent+0x0/0x16
 [<000e450e>] blk_register_queue+0x56/0x94
 [<00051684>] bdi_register+0x54/0x5e
 [<000f4040>] sprintf+0x0/0x26
 [<000516b4>] bdi_register_dev+0x26/0x2c
 [<000e7e70>] add_disk+0xb8/0x12c
 [<000e7db8>] add_disk+0x0/0x12c
 [<0027e424>] atari_floppy_init+0x14c/0x6e4
 [<0027e2d8>] atari_floppy_init+0x0/0x6e4
 [<00002008>] do_one_initcall+0x0/0x19a
 [<002781ce>] __alloc_bootmem+0x0/0x1a
 [<00002024>] do_one_initcall+0x1c/0x19a
 [<001be5b0>] mutex_lock+0x0/0x24
 [<00075d1e>] ifind+0x16/0x5c
 [<000a0844>] sysfs_ilookup_test+0x0/0x18
 [<00075d92>] ilookup5+0x2e/0x38
 [<000a0e70>] sysfs_addrm_finish+0x1c/0x200
 [<002781ce>] __alloc_bootmem+0x0/0x1a
 [<000a0432>] sysfs_add_file_mode+0x5a/0x84
 [<001244aa>] sysdev_class_create_file+0x0/0x16
 [<000a0478>] sysfs_add_file+0x1c/0x22
 [<000a04bc>] sysfs_create_file+0x3e/0x44
 [<001244bc>] sysdev_class_create_file+0x12/0x16
 [<0027e102>] cpu_dev_init+0x4e/0x6c
 [<0026eaa8>] kernel_init+0x6e/0xc2
 [<0027e2d8>] atari_floppy_init+0x0/0x6e4
 [<0026ea3a>] kernel_init+0x0/0xc2
 [<00027902>] printk+0x0/0x1a
 [<00002ada>] kernel_thread+0x3a/0x4e

---[ end trace 7d0e1e0e92952ce0 ]---

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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