[syzbot] [input?] [usb?] WARNING in cm109_urb_irq_callback

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 663d0d1af3fa Add linux-next specific files for 20251126
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14c584b4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8705ffbbff9235f
dashboard link: https://syzkaller.appspot.com/bug?extid=c708736c2ec142a386fd
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10746f42580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1456de12580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bccd41a8a8ce/disk-663d0d1a.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/21ebce6fa0f2/vmlinux-663d0d1a.xz
kernel image: https://storage.googleapis.com/syzbot-assets/441ffa7b502f/bzImage-663d0d1a.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c70873...@syzkaller.appspotmail.com

cm109 1-1:0.8: cm109_urb_irq_callback: urb status -71
------------[ cut here ]------------
URB ffff8880269d7000 submitted while active
WARNING: drivers/usb/core/urb.c:380 at 0x0, CPU#1: syz.0.17/6058
Modules linked in:
CPU: 1 UID: 0 PID: 6058 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:usb_submit_urb+0x7e/0x18d0 drivers/usb/core/urb.c:380
Code: 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 67 4e 21 fb 49 83 3e 00 74 40 e8 bc fe ba fa 48 8d 3d 75 5b c5 08 48 89 de <67> 48 0f b9 3a b8 f0 ff ff ff eb 11 e8 a1 fe ba fa eb 05 e8 9a fe
RSP: 0018:ffffc90000a08878 EFLAGS: 00010046
RAX: ffffffff8706e144 RBX: ffff8880269d7000 RCX: ffff88802503bd00
RDX: 0000000000000100 RSI: ffff8880269d7000 RDI: ffffffff8fcc3cc0
RBP: 000000000000000f R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141100 R12: 0000000000000820
R13: ffff88807b288030 R14: ffff8880269d7008 R15: dffffc0000000000
FS: 0000555591d77500(0000) GS:ffff888125b3e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2160730e9c CR3: 000000007837a000 CR4: 00000000003526f0
Call Trace:
<IRQ>
cm109_submit_ctl drivers/input/misc/cm109.c:380 [inline]
cm109_urb_irq_callback+0x709/0xcd0 drivers/input/misc/cm109.c:431
__usb_hcd_giveback_urb+0x376/0x540 drivers/usb/core/hcd.c:1661
dummy_timer+0x85f/0x45b0 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x51c/0xc30 kernel/time/hrtimer.c:1841
hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
handle_softirqs+0x27d/0x850 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:727
irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 eb f6 64 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a3 7f 2c f6 65 8b 05 2c 61 59 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90003b7faa0 EFLAGS: 00000206
RAX: ea11a46cfad79300 RBX: 0000000000000a02 RCX: ea11a46cfad79300
RDX: 0000000000000006 RSI: ffffffff8da6f16a RDI: 0000000000000001
RBP: ffffc90003b7fb28 R08: ffffffff8fbf8277 R09: 1ffffffff1f7f04e
R10: dffffc0000000000 R11: fffffbfff1f7f04f R12: dffffc0000000000
R13: 1ffff1102887017f R14: ffff888144380000 R15: 1ffff9200076ff54
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
dummy_pullup+0x18c/0x200 drivers/usb/gadget/udc/dummy_hcd.c:926
usb_gadget_disconnect_locked+0x143/0x490 drivers/usb/gadget/udc/core.c:780
gadget_unbind_driver+0xc7/0x460 drivers/usb/gadget/udc/core.c:1685
device_remove drivers/base/dd.c:569 [inline]
__device_release_driver drivers/base/dd.c:1274 [inline]
device_release_driver_internal+0x46f/0x800 drivers/base/dd.c:1297
driver_detach+0x1f3/0x2d0 drivers/base/dd.c:1360
bus_remove_driver+0x226/0x320 drivers/base/bus.c:785
usb_gadget_unregister_driver+0x4e/0x70 drivers/usb/gadget/udc/core.c:1751
raw_release+0xd7/0x260 drivers/usb/gadget/legacy/raw_gadget.c:463
__fput+0x44c/0xa70 fs/file_table.c:468
task_work_run+0x1d4/0x260 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff71818f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc6614e5d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 000000000001fed9 RCX: 00007ff71818f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 000000056614e8cf
R10: 0000001b31f20000 R11: 0000000000000246 R12: 00007ff7183e5fac
R13: 00007ff7183e5fa0 R14: ffffffffffffffff R15: 0000000000000003
</TASK>
----------------
Code disassembly (best guess):
0: 89 f0 mov %esi,%eax
2: 48 c1 e8 03 shr $0x3,%rax
6: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
b: 74 08 je 0x15
d: 4c 89 f7 mov %r14,%rdi
10: e8 67 4e 21 fb call 0xfb214e7c
15: 49 83 3e 00 cmpq $0x0,(%r14)
19: 74 40 je 0x5b
1b: e8 bc fe ba fa call 0xfabafedc
20: 48 8d 3d 75 5b c5 08 lea 0x8c55b75(%rip),%rdi # 0x8c55b9c
27: 48 89 de mov %rbx,%rsi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: b8 f0 ff ff ff mov $0xfffffff0,%eax
34: eb 11 jmp 0x47
36: e8 a1 fe ba fa call 0xfabafedc
3b: eb 05 jmp 0x42
3d: e8 .byte 0xe8
3e: 9a (bad)
3f: fe .byte 0xfe


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