Bug 15589

On Wednesday 05 May 2010, Stefan Lippers-Hollmann wrote:
> Hi
> 
> On Wednesday 05 May 2010, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a summary report
> > of recent regressions.
> > 
> > The following bug entry is on the current list of known regressions
> > from 2.6.33.  Please verify if it still should be listed and let the
> tracking team
> > know (either way).
> > 
> > 
> > Bug-Entry   : http://bugzilla.kernel.org/show_bug.cgi?id=15589
> > Subject             : 2.6.34-rc1: Badness at fs/proc/generic.c:316
> > Submitter   : Christian Kujau <lists@nerdbynature.de>
> > Date                : 2010-03-13 23:53 (53 days old)
> > Message-ID  : <alpine.DEB.2.01.1003131544340.5493@bogon.housecafe.de>
> > References  : http://marc.info/?l=linux-kernel&m=126852442903680&w=2
> 
> Still valid for b2c2_flexcop_pci in 2.6.34-rc6-git2:
> 
> [    8.736930] Linux video capture interface: v2.00
> [    8.809720] b2c2-flexcop: B2C2 FlexcopII/II(b)/III digital TV receiver
> chip loaded successfully
> [    8.818680] flexcop-pci: will use the HW PID filter.
> [    8.818685] flexcop-pci: card revision 2
> [    8.818694] b2c2_flexcop_pci 0000:06:01.0: PCI INT A -> GSI 19 (level,
> low) -> IRQ 19
> [    8.818794] ------------[ cut here ]------------
> [    8.818799] WARNING: at
> /tmp/buildd/linux-sidux-2.6-2.6.34~rc6-git2/debian/build/source_amd64_none/fs/proc/generic.c:317
> __xlate_proc_name+0xb5/0xd0()
> [    8.818801] Hardware name: EP45-DS3
> [    8.818802] name 'Technisat/B2C2 FlexCop II/IIb/III Digital TV PCI Driver'
> [    8.818804] Modules linked in: b2c2_flexcop_pci(+) cx88xx b2c2_flexcop
> rfkill v4l2_common ir_common videodev drm snd_pcm snd_seq rtc_cmos snd_timer
> rtc_core snd_seq_device rtc_lib v4l1_compat tveeprom v4l2_compat_ioctl32
> ir_core dvb_core snd videobuf_dma_sg cx24123 cx24113 videobuf_core s5h1420
> tpm_tis led_class btcx_risc tpm i2c_i801 i2c_algo_bit tpm_bios i2c_core evdev
> intel_agp soundcore snd_page_alloc button processor ext4 mbcache jbd2 crc16
> dm_mod sg sr_mod cdrom sd_mod usbhid hid uhci_hcd ahci firewire_ohci libata
> firewire_core crc_itu_t ehci_hcd r8169 mii scsi_mod thermal usbcore nls_base
> [last unloaded: scsi_wait_scan]
> [    8.818832] Pid: 1064, comm: modprobe Not tainted 2.6.34-rc6-sidux-amd64
> #1
> [    8.818833] Call Trace:
> [    8.818837]  [<ffffffff8104ba83>] ? warn_slowpath_common+0x73/0xb0
> [    8.818839]  [<ffffffff8104bb20>] ? warn_slowpath_fmt+0x40/0x50
> [    8.818842]  [<ffffffff8114f545>] ? __xlate_proc_name+0xb5/0xd0
> [    8.818844]  [<ffffffff8114fb2e>] ? __proc_create+0x7e/0x150
> [    8.818846]  [<ffffffff811504e7>] ? proc_mkdir_mode+0x27/0x60
> [    8.818849]  [<ffffffff8109fb55>] ? register_handler_proc+0x115/0x130
> [    8.818852]  [<ffffffff8109d4c1>] ? __setup_irq+0x1d1/0x330
> [    8.818855]  [<ffffffffa03bc160>] ? flexcop_pci_isr+0x0/0x190
> [b2c2_flexcop_pci]
> [    8.818858]  [<ffffffff8109d735>] ? request_threaded_irq+0x115/0x1b0
> [    8.818860]  [<ffffffffa03bc495>] ? flexcop_pci_probe+0x1a5/0x330
> [b2c2_flexcop_pci]
> [    8.818864]  [<ffffffff811ceef2>] ? local_pci_probe+0x12/0x20
> [    8.818867]  [<ffffffff811d02ca>] ? pci_device_probe+0x10a/0x130
> [    8.818870]  [<ffffffff8125cdda>] ? driver_sysfs_add+0x5a/0x80
> [    8.818872]  [<ffffffff8125cf03>] ? driver_probe_device+0x93/0x190
> [    8.818874]  [<ffffffff8125d093>] ? __driver_attach+0x93/0xa0
> [    8.818876]  [<ffffffff8125d000>] ? __driver_attach+0x0/0xa0
> [    8.818878]  [<ffffffff8125c638>] ? bus_for_each_dev+0x58/0x80
> [    8.818880]  [<ffffffff8125be70>] ? bus_add_driver+0xb0/0x250
> [    8.818882]  [<ffffffff8125d38a>] ? driver_register+0x6a/0x130
> [    8.818884]  [<ffffffff811d056c>] ? __pci_register_driver+0x4c/0xc0
> [    8.818887]  [<ffffffffa03bf000>] ? flexcop_pci_module_init+0x0/0x20
> [b2c2_flexcop_pci]
> [    8.818890]  [<ffffffff81002044>] ? do_one_initcall+0x34/0x1a0
> [    8.818893]  [<ffffffff8107d15f>] ? sys_init_module+0xdf/0x260
> [    8.818896]  [<ffffffff81009f42>] ? system_call_fastpath+0x16/0x1b
> [    8.818897] ---[ end trace 46b5c98323696f39 ]---
> [    8.822389] DVB: registering new adapter (FlexCop Digital TV device)
> [    8.823874] b2c2-flexcop: MAC address = 00:d0:d7:0c:83:d6

Michael Ellerman says this could be fixed in 2.6.35, see: 
http://lkml.org/lkml/2010/5/9/147

Patch submitted for consideration for 35:
http://patchwork.ozlabs.org/patch/52978/

Created attachment 26452 [details]
dmesg & /proc/device-tree with Michael's patch applied

2.6.34 & http://patchwork.ozlabs.org/patch/52978/

Thanks Michael! Yes with your patch applied to 2.6.34 (vanilla), the WARNING goes away, so:

   Tested-by: Christian Kujau <lists@nerdbynature.de>


The only thing still there is:

device-tree: Duplicate name in /cpus/PowerPC,G4@0, renamed to "l2-cache#1"
device-tree: Duplicate name in /pci@f4000000/firewire@e/node@0023a409ee10b7a6, renamed to "sbp-2@c000#1"

...but that's a different issue I guess. Full dmesg & config & /proc/device-tree are in 52978.tar.bz2 I just attached.

Thanks Christian.

The duplicate l2-cache name is nothing to worry about, I haven't seen the other one before, but I doubt it will affect anything in Linux.

Handled-By : Michael Ellerman <michael@ellerman.id.au>
Patch : http://patchwork.ozlabs.org/patch/52978/

On Sunday, June 13, 2010, Stefan Lippers-Hollmann wrote:
> Hi
> 
> On Sunday 13 June 2010, Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of regressions introduced between 2.6.33 and 2.6.34.
> > 
> > The following bug entry is on the current list of known regressions
> > introduced between 2.6.33 and 2.6.34.  Please verify if it still should
> > be listed and let the tracking team know (either way).
> > 
> > 
> > Bug-Entry   : http://bugzilla.kernel.org/show_bug.cgi?id=15589
> > Subject             : 2.6.34-rc1: Badness at fs/proc/generic.c:316
> > Submitter   : Christian Kujau <lists@nerdbynature.de>
> > Date                : 2010-03-13 23:53 (93 days old)
> > Message-ID  : <<alpine.DEB.2.01.1003131544340.5493@bogon.housecafe.de>>
> > References  : http://marc.info/?l=linux-kernel&m=126852442903680&w=2
> > Handled-By  : Michael Ellerman <michael@ellerman.id.au>
> > Patch               : http://patchwork.ozlabs.org/patch/52978/
> 
> Still existing in 2.6.34 and 2.6.35 HEAD, however a patch fixing the issue 
> for b2c2-flexcop/ flexcop-pci has been posted last week:
>       From:           Jindřich Makovička <makovick@gmail.com>
>       Subject:                [PATCH] DVB flexcop-pci: sanitize driver name
> to avoid warning on load
>       Date:           Mon, 7 Jun 2010 14:51:30 +0200
>       Message-ID:    
> <AANLkTikNcCtUn9SQwKu2b3IE6NiAwAhciHsm1HVH4EJh@mail.gmail.com>
>       URL:                   
> http://lkml.indiana.edu/hypermail/linux/kernel/1006.0/00137.html

Handled-By : Jindřich Makovička <makovick@gmail.com>
Patch : http://lkml.indiana.edu/hypermail/linux/kernel/1006.0/00137.html

Patch by Michael Ellerman has been commited to mainline:

* http://kerneltrap.org/mailarchive/git-commits-head/2010/6/27/41747
* http://git.kernel.org/linus/9f069af5b62919151d76b37a3b168cbb34c874c3

As soon as .35 is released, we could CLOSE this one.

Problem fixed in the mainline, closing.