[syzbot] [usb?] WARNING in i2c_unregister_device

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a59f57e2aa12 Merge tag 'watchdog-for-v7.2-rc7' of git://gi..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=14e28079580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
dashboard link: https://syzkaller.appspot.com/bug?extid=3fb7629cfd12d04beeab
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12349fb9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1793bfb9580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6e78675a9575/disk-a59f57e2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8214e30981cd/vmlinux-a59f57e2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/44559008ddee/bzImage-a59f57e2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3fb762...@syzkaller.appspotmail.com

------------[ cut here ]------------
Device '2-002c' does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst.
WARNING: drivers/base/core.c:2638 at device_release+0x1da/0x270 drivers/base/core.c:2638, CPU#1: kworker/1:3/4450
Modules linked in:
CPU: 1 UID: 0 PID: 4450 Comm: kworker/1:3 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:device_release+0x1dd/0x270 drivers/base/core.c:2638
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 93 00 00 00 48 8b 6b 50 48 85 ed 74 19 e8 6d 94 af fb 48 8d 3d d6 1a d3 0a 48 89 ee <67> 48 0f b9 3a e9 eb fe ff ff e8 54 94 af fb 48 89 da 48 b8 00 00
RSP: 0018:ffffc90010427548 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88807d9c3020 RCX: ffffffff8bb0ba12
RDX: ffff888036a3ca80 RSI: ffff888022a8dc00 RDI: ffffffff912deb50
RBP: ffff888022a8dc00 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888038298400
R13: dffffc0000000000 R14: ffff888022a8dc00 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000000 CR3: 000000002aaa6000 CR4: 00000000003526f0
Call Trace:
<TASK>
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1f7/0x640 lib/kobject.c:737
put_device drivers/base/core.c:3880 [inline]
device_unregister+0x2f/0xe0 drivers/base/core.c:4003
i2c_unregister_device+0xf5/0x270 drivers/i2c/i2c-core-base.c:1075
i2c_deregister_clients+0x255/0x460 drivers/i2c/i2c-core-base.c:1782
i2c_del_adapter+0x124/0x2d0 drivers/i2c/i2c-core-base.c:1820
i2c_tiny_usb_disconnect+0x43/0xe0 drivers/i2c/busses/i2c-tiny-usb.c:282
usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:618 [inline]
device_remove+0x12a/0x180 drivers/base/dd.c:610
__device_release_driver drivers/base/dd.c:1349 [inline]
device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372
bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664
device_del+0x376/0x9b0 drivers/base/core.c:3961
usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478
usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2345
hub_port_connect drivers/usb/core/hub.c:5407 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x1c4f/0x4a60 drivers/usb/core/hub.c:5953
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
----------------
Code disassembly (best guess):
0: df 48 89 fisttps -0x77(%rax)
3: fa cli
4: 48 c1 ea 03 shr $0x3,%rdx
8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
c: 0f 85 93 00 00 00 jne 0xa5
12: 48 8b 6b 50 mov 0x50(%rbx),%rbp
16: 48 85 ed test %rbp,%rbp
19: 74 19 je 0x34
1b: e8 6d 94 af fb call 0xfbaf948d
20: 48 8d 3d d6 1a d3 0a lea 0xad31ad6(%rip),%rdi # 0xad31afd
27: 48 89 ee mov %rbp,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e9 eb fe ff ff jmp 0xffffff1f
34: e8 54 94 af fb call 0xfbaf948d
39: 48 89 da mov %rbx,%rdx
3c: 48 rex.W
3d: b8 .byte 0xb8


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