[Bug 2121997] Re: kernel: sysfs: cannot create duplicate filename '/bus/platform/devices/iTCO_wdt'

This bug is awaiting verification that the linux/6.8.0-91.92 kernel in
-proposed solves the problem. Please test the kernel and update this bug
with the results. If the problem is solved, change the tag
'verification-needed-noble-linux' to 'verification-done-noble-linux'. If
the problem still exists, change the tag 'verification-needed-noble-
linux' to 'verification-failed-noble-linux'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-v2 verification-needed-noble-linux

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https://bugs.launchpad.net/bugs/2121997

Title:
kernel: sysfs: cannot create duplicate filename
'/bus/platform/devices/iTCO_wdt'

Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-6.14 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Fix Committed
Status in linux-oem-6.14 source package in Noble:
Fix Released
Status in linux source package in Plucky:
Fix Committed
Status in linux-oem-6.14 source package in Plucky:
Invalid
Status in linux source package in Questing:
Fix Released
Status in linux-oem-6.14 source package in Questing:
Invalid

Bug description:
[Impact]
Encounter the errors while booting up
Jun 10 08:14:57 ubuntu-202506-36892 kernel: sysfs: cannot create duplicate filename '/bus/platform/devices/iTCO_wdt'
Jun 10 08:14:57 ubuntu-202506-36892 kernel: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.14.0-8006-oem #6+staging.5-Ubuntu
Jun 10 08:14:57 ubuntu-202506-36892 kernel: Hardware name: Dell Inc. Dell Pro Max Tower T4 FCT4260/, BIOS 0.8.33 06/11/2025
Jun 10 08:14:57 ubuntu-202506-36892 kernel: Workqueue: events work_for_cpu_fn
Jun 10 08:14:57 ubuntu-202506-36892 kernel: Call Trace:
Jun 10 08:14:57 ubuntu-202506-36892 kernel: <TASK>
Jun 10 08:14:57 ubuntu-202506-36892 kernel: dump_stack_lvl+0x76/0xa0
Jun 10 08:14:57 ubuntu-202506-36892 kernel: dump_stack+0x10/0x20
Jun 10 08:14:57 ubuntu-202506-36892 kernel: sysfs_warn_dup+0x8a/0xb0
Jun 10 08:14:57 ubuntu-202506-36892 kernel: sysfs_do_create_link_sd+0xf1/0x100
Jun 10 08:14:57 ubuntu-202506-36892 kernel: sysfs_create_link+0x21/0x50
Jun 10 08:14:57 ubuntu-202506-36892 kernel: bus_add_device+0x69/0x140
Jun 10 08:14:57 ubuntu-202506-36892 kernel: device_add+0x3bd/0x710
Jun 10 08:14:57 ubuntu-202506-36892 kernel: platform_device_add+0x193/0x270
Jun 10 08:14:57 ubuntu-202506-36892 kernel: platform_device_register_full+0x10d/0x1c0

[Fix]
Intel provides a patch to fix this issue which is included in v6.17-rc5.
664596bd98bb i2c: i801: Hide Intel Birch Stream SoC TCO WDT

https://lore.kernel.org/linux-i2c/20250901125943.916522-1-chiasheng.lee@linux.intel.com/

[Test]
1. Boot up the Intel Birch Stream SoC machine which has multiple devices need to load i801_smbus module
2. There should be no such error in dmesg
   sysfs: cannot create duplicate filename '/bus/platform/devices/iTCO_wdt'

[Where problems could occur]
It removes the watchdog feature for Intel Birch Stream SoC in the driver, won't affect other platforms, and should not introduce any regressions.

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