Re: Fwd: sysfs: cannot create duplicate filename .../system76_acpi::kbd_backlight/color

[Bagas Sanjaya]

On Thu, Oct 26, 2023 at 02:55:06PM +0700, Bagas Sanjaya wrote:
> Hi,
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
> 
> > Loading the system76-acpi kernel module fails on linux 6.6-rc7. This does not seem to be an issue with system76-acpi itself, because reverting commit #5d36931f0fe51665c04f56c027613d22e6a03411, which is the only change made to this driver across the 6.6 development cycle, does not fix the issue. On 6.5.8, everything works fine. My hardware is a Clevo-based Alder Lake laptop running coreboot, roughly similar to the System76 Darter Pro 8.
> > 
> > backtrace:
> > [  266.399036] sysfs: cannot create duplicate filename '/devices/LNXSYSTM:00/LNXSYBUS:00/17761776:00/leds/system76_acpi::kbd_backlight/color'
> > [  266.399045] CPU: 1 PID: 2896 Comm: modprobe Not tainted 6.6.0-rc7 #1
> > [  266.399050] Hardware name: Notebook NS5x_NS7xPU/NS5x_NS7xPU, BIOS Dasharo (coreboot+UEFI) v1.6.0 03/30/2023
> > [  266.399053] Call Trace:
> > [  266.399057]  <TASK>
> > [  266.399063]  dump_stack_lvl+0x36/0x50
> > [  266.399080]  sysfs_warn_dup+0x5a/0x70
> > [  266.399088]  sysfs_add_file_mode_ns+0x11a/0x130
> > [  266.399094]  internal_create_group+0x125/0x3b0
> > [  266.399101]  internal_create_groups+0x42/0xa0
> > [  266.399107]  device_add+0x5b1/0x8a0
> > [  266.399113]  ? kstrdup+0x4c/0x70
> > [  266.399119]  device_create_groups_vargs+0xce/0xf0
> > [  266.399124]  device_create_with_groups+0x4b/0x70
> > [  266.399129]  led_classdev_register_ext+0x1d2/0x470 [led_class]
> > [  266.399149]  ? devm_led_classdev_register_ext+0x3a/0x90 [led_class]
> > [  266.399162]  devm_led_classdev_register_ext+0x50/0x90 [led_class]
> > [  266.399173]  system76_add+0x18b/0x460 [system76_acpi]
> > [  266.399186]  acpi_device_probe+0x47/0x130
> > [  266.399193]  really_probe+0x19b/0x3e0
> > [  266.399199]  ? __pfx___driver_attach+0x10/0x10
> > [  266.399205]  __driver_probe_device+0x78/0x160
> > [  266.399211]  driver_probe_device+0x1f/0x90
> > [  266.399217]  __driver_attach+0xd2/0x1c0
> > [  266.399222]  bus_for_each_dev+0x85/0xd0
> > [  266.399227]  bus_add_driver+0x116/0x220
> > [  266.399233]  driver_register+0x59/0x100
> > [  266.399242]  ? __pfx_system76_driver_init+0x10/0x10 [system76_acpi]
> > [  266.399252]  do_one_initcall+0x5a/0x300
> > [  266.399260]  do_init_module+0x60/0x240
> > [  266.399267]  init_module_from_file+0x86/0xc0
> > [  266.399275]  __x64_sys_finit_module+0x18a/0x350
> > [  266.399282]  do_syscall_64+0x5d/0x90
> > [  266.399289]  ? syscall_exit_to_user_mode+0x26/0x40
> > [  266.399295]  ? do_syscall_64+0x6c/0x90
> > [  266.399300]  ? do_syscall_64+0x6c/0x90
> > [  266.399305]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
> > [  266.399314] RIP: 0033:0x7f5c11b38d7d
> > [  266.399360] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 7b d0 0b 00 f7 d8 64 89 01 48
> > [  266.399364] RSP: 002b:00007ffe30e15b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
> > [  266.399370] RAX: ffffffffffffffda RBX: 000055a8d48d6c10 RCX: 00007f5c11b38d7d
> > [  266.399372] RDX: 0000000000000000 RSI: 000055a8d3077d8b RDI: 0000000000000003
> > [  266.399375] RBP: 000055a8d3077d8b R08: 00007f5c11bf6b00 R09: 00007ffe30e15bd0
> > [  266.399376] R10: 0000000000000050 R11: 0000000000000246 R12: 0000000000040000
> > [  266.399378] R13: 000055a8d48d6c90 R14: 000055a8d48d6390 R15: 000055a8d48d7090
> > [  266.399382]  </TASK>
> > [  266.399410] System76 ACPI Driver: probe of 17761776:00 failed with error -17
> 
> See Bugzilla for the full thread and attached dmesg output.
> 
> Anyway, I'm adding this regression to regzbot:
> 
> #regzbot introduced: v6.5..v6.6-rc7 https://bugzilla.kernel.org/show_bug.cgi?id=218045
> 

The reporter had narrowed down the culprit. He said on Bugzilla:

> The culprit seems to be commit c7d80059b086c4986cd994a1973ec7a5d75f8eea, which introduces a new 'color' attribute for led sysfs class devices. The problem is that the system76-acpi platform driver tries to create the exact same sysfs attribute itself for the system76_acpi::kbd_backlight device, leading to the conflict. For testing purposes, I've just rebuilt the kernel with the system76-apci color attribute renamed to kb_color, and that fixes the issue.

Jean-Jacques Hiblot, would you like to take a look on this regression,
since you authored the culprit?

Anyway, telling regzbot:

#regzbot introduced: c7d80059b086c4

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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