refcount_t: underflow; use-after-free.
------------[ cut here ]------------
kernel BUG at lib/refcount.c:37!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 7562 Comm: v4l_id Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:refcount_warn_saturate+0x104/0x110 lib/refcount.c:37
Code: 5d ff ff ff e8 4d c1 d1 fc 48 c7 c7 00 e3 8d 8c e8 61 69 30 fc 90 0f 0b e8 39 c1 d1 fc 48 c7 c7 80 e3 8d 8c e8 4d 69 30 fc 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900065b7cc0 EFLAGS: 00010246
RAX: 0000000000000026 RBX: 0000000000000003 RCX: 86d7792bd9d84300
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff90033f40
RBP: 0000000000000000 R08: ffffffff81a6b7f0 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff237c1d8 R12: 1ffffffff1973318
R13: dffffc0000000000 R14: ffff88807cc000b0 R15: ffffffff882fcb70
FS:  00007f2b1fb76880(0000) GS:ffff8881234da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055aef7b1964d CR3: 0000000075e40000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 v4l2_device_put+0xc2/0xd0 drivers/media/v4l2-core/v4l2-device.c:56
 device_release+0xc4/0x1f0 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x222/0x550 lib/kobject.c:737
 video_put drivers/media/v4l2-core/v4l2-dev.c:173 [inline]
 v4l2_release+0x273/0x350 drivers/media/v4l2-core/v4l2-dev.c:480
 __fput+0x408/0xa40 fs/file_table.c:513
 fput_close_sync+0x11f/0x240 fs/file_table.c:619
 filp_close_sync fs/open.c:1897 [inline]
 __do_sys_close fs/open.c:2153 [inline]
 __se_sys_close+0xa2/0x160 fs/open.c:2140
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2b1f4a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007fffdbbfc440 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007f2b1fb76880 RCX: 00007f2b1f4a7407
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f2b1fb766e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000013
R13: 00007fffdbbfc670 R14: 00007f2b1fcdd000 R15: 000055aef7b1d4d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:refcount_warn_saturate+0x104/0x110 lib/refcount.c:37
Code: 5d ff ff ff e8 4d c1 d1 fc 48 c7 c7 00 e3 8d 8c e8 61 69 30 fc 90 0f 0b e8 39 c1 d1 fc 48 c7 c7 80 e3 8d 8c e8 4d 69 30 fc 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900065b7cc0 EFLAGS: 00010246
RAX: 0000000000000026 RBX: 0000000000000003 RCX: 86d7792bd9d84300
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff90033f40
RBP: 0000000000000000 R08: ffffffff81a6b7f0 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff237c1d8 R12: 1ffffffff1973318
R13: dffffc0000000000 R14: ffff88807cc000b0 R15: ffffffff882fcb70
FS:  00007f2b1fb76880(0000) GS:ffff8881234da000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055aef7b1964d CR3: 0000000075e40000 CR4: 00000000003526f0