------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 15770 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Modules linked in:
CPU: 0 PID: 15770 Comm: syz-executor.4 Not tainted 6.2.0-rc2-syzkaller-00282-g0a71553536d2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Code: c7 60 75 4b 8b 31 c0 e8 23 78 14 fd 0f 0b eb 85 e8 4a 88 4d fd c6 05 6b 42 44 0a 01 48 c7 c7 c0 75 4b 8b 31 c0 e8 05 78 14 fd <0f> 0b e9 64 ff ff ff e8 29 88 4d fd c6 05 4b 42 44 0a 01 48 c7 c7
RSP: 0018:ffffc9000b29fd28 EFLAGS: 00010246
RAX: 4aff88544f2af100 RBX: 0000000000000003 RCX: 0000000000040000
RDX: ffffc9000b659000 RSI: 0000000000003938 RDI: 0000000000003939
RBP: 0000000000000003 R08: ffffffff816f2c9d R09: fffff52001653f5d
R10: fffff52001653f5d R11: 1ffff92001653f5c R12: ffffffff86f231c0
R13: ffff88807b93a068 R14: ffff88807b8e2040 R15: ffff88807b8e2000
FS:  00007fe926c8d700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24fbd821b8 CR3: 000000005c559000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:283 [inline]
 __refcount_dec_and_test include/linux/refcount.h:315 [inline]
 refcount_dec_and_test include/linux/refcount.h:333 [inline]
 put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]
 gadgetfs_kill_sb+0xe8/0x100 drivers/usb/gadget/legacy/inode.c:2086
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 vfs_get_super fs/super.c:1149 [inline]
 get_tree_single+0xd0/0x160 fs/super.c:1165
 vfs_get_tree+0x88/0x270 fs/super.c:1489
 vfs_fsconfig_locked fs/fsopen.c:232 [inline]
 __do_sys_fsconfig fs/fsopen.c:439 [inline]
 __se_sys_fsconfig+0xbc0/0x1060 fs/fsopen.c:314
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fe925e8c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe926c8d168 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007fe925fabf80 RCX: 00007fe925e8c0c9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007fe925ee7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc5404ceef R14: 00007fe926c8d300 R15: 0000000000022000
 </TASK>