[v6.6] WARNING in dpm_sysfs_add (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 9760bf04666d Linux 6.6.135
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=126fac36580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c5b35c4db8465904
dashboard link: https://syzkaller.appspot.com/bug?extid=1b4f81061866473f4990
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a685913d05a7/disk-9760bf04.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a3c1d21d4bca/vmlinux-9760bf04.xz
kernel image: https://storage.googleapis.com/syzbot-assets/09178887ef0d/bzImage-9760bf04.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1b4f81...@syzkaller.appspotmail.com

usb 5-1: Direct firmware load for ueagle-atm/eagleI.fw failed with error -2
usb 5-1: Falling back to sysfs fallback for: ueagle-atm/eagleI.fw
------------[ cut here ]------------
sysfs group 'power' not found for kobject 'ueagle-atm!eagleI.fw'
WARNING: CPU: 1 PID: 5756 at fs/sysfs/group.c:284 sysfs_remove_group+0x178/0x2a0 fs/sysfs/group.c:282
Modules linked in:
CPU: 1 PID: 5756 Comm: kworker/1:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Workqueue: events request_firmware_work_func
RIP: 0010:sysfs_remove_group+0x178/0x2a0 fs/sysfs/group.c:282
Code: 48 8b 1b 4c 89 f8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 fa 1d c9 ff 49 8b 17 48 c7 c7 40 b8 da 8a 48 89 de e8 d8 9c 3a ff <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 42 e6 70 ff
RSP: 0018:ffffc900045ff888 EFLAGS: 00010246
RAX: 32a48e17a6c6e500 RBX: ffffffff8b41be20 RCX: ffff88802e50da00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: dffffc0000000000 R08: ffffc900045ff487 R09: 1ffff920008bfe90
R10: dffffc0000000000 R11: fffff520008bfe91 R12: 1ffffffff16837c8
R13: 1ffff1100b94062a R14: ffff88805ec253e0 R15: ffff88805ca03008
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f11fff8 CR3: 0000000065dd1000 CR4: 00000000003506e0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
dpm_sysfs_add+0x202/0x270 drivers/base/power/sysfs.c:734
device_add+0x56a/0xc20 drivers/base/core.c:3643
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:82 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:158 [inline]
firmware_fallback_sysfs+0x2e9/0x930 drivers/base/firmware_loader/fallback.c:234
_request_firmware+0xf27/0x1510 drivers/base/firmware_loader/main.c:936
request_firmware_work_func+0xb0/0x1b0 drivers/base/firmware_loader/main.c:1189
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>


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