linux-kernel - WARNING in firmware_fallback

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Date:   Thu, 04 Mar 2021 00:20:21 -0800
From:   syzbot <syzbot+95f2e2439b97575ec3c0@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com
Subject: WARNING in firmware_fallback_sysfs

Hello,

syzbot found the following issue on:

HEAD commit:    5695e516 Merge tag 'io_uring-worker.v3-2021-02-25' of git:..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16f34e46d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=90173e86f0624adc
dashboard link: https://syzkaller.appspot.com/bug?extid=95f2e2439b97575ec3c0
userspace arch: arm64

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+95f2e2439b97575ec3c0@...kaller.appspotmail.com

------------[ cut here ]------------
sysfs group 'power' not found for kobject 'ueagle-atm!eagleI.fw'
WARNING: CPU: 1 PID: 32 at fs/sysfs/group.c:279 sysfs_remove_group+0x94/0xa0 fs/sysfs/group.c:279
Modules linked in:
CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.11.0-syzkaller-11646-g5695e5161974 #0
Hardware name: linux,dummy-virt (DT)
Workqueue: events request_firmware_work_func
pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--)
pc : sysfs_remove_group+0x94/0xa0 fs/sysfs/group.c:279
lr : sysfs_remove_group+0x94/0xa0 fs/sysfs/group.c:279
sp : ffff800013e83bb0
x29: ffff800013e83bb0 x28: ffff800013a9de40 
x27: f5ff00000dff3688 x26: f5ff00000dff3620 
x25: f9ff00000b7e40a0 x24: faff00000a690b00 
x23: f9ff00000b7e40a0 x22: 0000000000000000 
x21: fdff00000de85808 x20: ffff8000124a9818 
x19: 0000000000000000 x18: 00000000fffffffd 
x17: 0000000000000000 x16: 0000000000000000 
x15: 0000000000000020 x14: ffffffffffffffff 
x13: 0000000000000e0b x12: ffff800013e83860 
x11: ffff800013a0b548 x10: 00000000ffffe000 
x9 : ffff800013a0b548 x8 : ffff80001395b548 
x7 : ffff800013a0b548 x6 : 0000000000000000 
x5 : ffff00007fbd7948 x4 : 0000000000015ff5 
x3 : 0000000000000001 x2 : 0000000000000000 
x1 : 0000000000000000 x0 : f5ff00000412eac0 
Call trace:
 sysfs_remove_group+0x94/0xa0 fs/sysfs/group.c:279
 dpm_sysfs_remove+0x60/0x70 drivers/base/power/sysfs.c:837
 device_del+0xa4/0x384 drivers/base/core.c:3398
 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:543 [inline]
 fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:581 [inline]
 firmware_fallback_sysfs+0x35c/0x460 drivers/base/firmware_loader/fallback.c:657
 _request_firmware+0x4c8/0x6d0 drivers/base/firmware_loader/main.c:831
 request_firmware_work_func+0x40/0xa0 drivers/base/firmware_loader/main.c:1077
 process_one_work+0x1d8/0x364 kernel/workqueue.c:2275
 worker_thread+0x70/0x434 kernel/workqueue.c:2421
 kthread+0x174/0x180 kernel/kthread.c:292
 ret_from_fork+0x10/0x34 arch/arm64/kernel/entry.S:958


---
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