[syzbot] [usb?] WARNING: locking bug in gadget_dev_open

[syzbot <syzbot+3dfcbe7ab191ca685ce7@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    4235cb24ec1e Merge tag 'vfs-7.2-rc5.fixes' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1749bfde580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f221a1b5d497ed15
dashboard link: https://syzkaller.appspot.com/bug?extid=3dfcbe7ab191ca685ce7
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
userspace arch: i386

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

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-4235cb24.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/68eef4847f46/vmlinux-4235cb24.xz
kernel image: https://storage.googleapis.com/syzbot-assets/77e73df69f7f/bzImage-4235cb24.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3dfcbe7ab191ca685ce7@syzkaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(!test_bit(class_idx, lock_classes_in_use))
WARNING: kernel/locking/lockdep.c:5207 at __lock_acquire+0x1469/0x1a40 kernel/locking/lockdep.c:5207, CPU#0: syz.4.1249/10653
Modules linked in:
CPU: 0 UID: 0 PID: 10653 Comm: syz.4.1249 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__lock_acquire+0x1470/0x1a40 kernel/locking/lockdep.c:5207
Code: 33 03 85 c0 74 10 44 8b 15 bd 7b 3d 0f 45 85 d2 0f 84 f7 01 00 00 90 e9 7a fd ff ff 48 8d 3d 57 e6 40 0f 48 c7 c6 30 c1 2b 8e <67> 48 0f b9 3a e9 cd fb ff ff 89 c6 48 c7 c7 f0 1e 6f 9b e8 48 15
RSP: 0018:ffffc9000db3f828 EFLAGS: 00010046
RAX: 0000000000000001 RBX: ffff888024728ba0 RCX: ffffc900297c1000
RDX: 0000000000080000 RSI: ffffffff8e2bc130 RDI: ffffffff91263b30
RBP: ffff888024728000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff99926684
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888096be3000(0063) knlGS:00000000f54adb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000c32c279 CR3: 000000004b285000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000e08e000e DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:174
 spin_lock_irq include/linux/spinlock.h:372 [inline]
 gadget_dev_open+0x44/0x1b0 drivers/usb/gadget/legacy/inode.c:1919
 do_dentry_open+0x6ab/0x14d0 fs/open.c:947
 vfs_open+0x82/0x3f0 fs/open.c:1052
 do_open fs/namei.c:4700 [inline]
 path_openat+0x2873/0x4280 fs/namei.c:4863
 do_file_open+0x20e/0x430 fs/namei.c:4892
 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368
 do_sys_open fs/open.c:1374 [inline]
 __do_compat_sys_openat fs/open.c:1436 [inline]
 __se_compat_sys_openat fs/open.c:1434 [inline]
 __ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1434
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70befec
Code: Unable to access opcode bytes at 0xf70befc2.
RSP: 002b:00000000f54ad50c EFLAGS: 00000292 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000080000300
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	33 03                	xor    (%rbx),%eax
   2:	85 c0                	test   %eax,%eax
   4:	74 10                	je     0x16
   6:	44 8b 15 bd 7b 3d 0f 	mov    0xf3d7bbd(%rip),%r10d        # 0xf3d7bca
   d:	45 85 d2             	test   %r10d,%r10d
  10:	0f 84 f7 01 00 00    	je     0x20d
  16:	90                   	nop
  17:	e9 7a fd ff ff       	jmp    0xfffffd96
  1c:	48 8d 3d 57 e6 40 0f 	lea    0xf40e657(%rip),%rdi        # 0xf40e67a
  23:	48 c7 c6 30 c1 2b 8e 	mov    $0xffffffff8e2bc130,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	e9 cd fb ff ff       	jmp    0xfffffc01
  34:	89 c6                	mov    %eax,%esi
  36:	48 c7 c7 f0 1e 6f 9b 	mov    $0xffffffff9b6f1ef0,%rdi
  3d:	e8                   	.byte 0xe8
  3e:	48                   	rex.W
  3f:	15                   	.byte 0x15


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