syzbot

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refcount_t: saturated; leaking memory.
WARNING: lib/refcount.c:22 at refcount_warn_saturate+0x8c/0x110 lib/refcount.c:22, CPU#0: syz.4.724/7511
Modules linked in:
CPU: 0 UID: 0 PID: 7511 Comm: syz.4.724 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:refcount_warn_saturate+0x8c/0x110 lib/refcount.c:22
Code: 75 68 e8 b7 15 23 fd 48 8d 3d 10 d2 f1 0a 67 48 0f b9 3a eb 66 85 db 74 3e 83 fb 01 75 4c e8 9b 15 23 fd 48 8d 3d 04 d2 f1 0a <67> 48 0f b9 3a eb 4a e8 88 15 23 fd 48 8d 3d 01 d2 f1 0a 67 48 0f
RSP: 0018:ffffc9001034f6f8 EFLAGS: 00010283
RAX: ffffffff84a15eb5 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc90006e42000 RSI: 0000000000000f57 RDI: ffffffff8f9330c0
RBP: 00000000ffffffff R08: ffff888025bc5c40 R09: 0000000000000005
R10: 0000000000000100 R11: 0000000000000004 R12: ffff88802c83d418
R13: ffffffff9975a8c0 R14: ffff88802c83d410 R15: ffff88802c83d400
FS:  00007f08d2a8e6c0(0000) GS:ffff888126179000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f08d4825f40 CR3: 0000000032328000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __refcount_add include/linux/refcount.h:-1 [inline]
 __refcount_inc include/linux/refcount.h:366 [inline]
 refcount_inc include/linux/refcount.h:383 [inline]
 kref_get include/linux/kref.h:45 [inline]
 dvb_device_get drivers/media/dvb-core/dvbdev.c:621 [inline]
 dvb_device_open+0x31f/0x360 drivers/media/dvb-core/dvbdev.c:106
 chrdev_open+0x4d0/0x5f0 fs/char_dev.c:411
 do_dentry_open+0x83d/0x13e0 fs/open.c:947
 vfs_open+0x3b/0x350 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x2e43/0x38a0 fs/namei.c:4858
 do_file_open+0x23e/0x4a0 fs/namei.c:4887
 do_sys_openat2+0x113/0x200 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f08d47fd60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f08d2a8db28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f08d2a8e6c0 RCX: 00007f08d47fd60e
RDX: 0000000000000002 RSI: 00007f08d2a8dc00 RDI: ffffffffffffff9c
RBP: 00007f08d2a8dc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f08d4ab6038 R14: 00007f08d4ab5fa0 R15: 00007ffc12dc4148
 </TASK>
----------------
Code disassembly (best guess):
   0:	75 68                	jne    0x6a
   2:	e8 b7 15 23 fd       	call   0xfd2315be
   7:	48 8d 3d 10 d2 f1 0a 	lea    0xaf1d210(%rip),%rdi        # 0xaf1d21e
   e:	67 48 0f b9 3a       	ud1    (%edx),%rdi
  13:	eb 66                	jmp    0x7b
  15:	85 db                	test   %ebx,%ebx
  17:	74 3e                	je     0x57
  19:	83 fb 01             	cmp    $0x1,%ebx
  1c:	75 4c                	jne    0x6a
  1e:	e8 9b 15 23 fd       	call   0xfd2315be
  23:	48 8d 3d 04 d2 f1 0a 	lea    0xaf1d204(%rip),%rdi        # 0xaf1d22e
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb 4a                	jmp    0x7b
  31:	e8 88 15 23 fd       	call   0xfd2315be
  36:	48 8d 3d 01 d2 f1 0a 	lea    0xaf1d201(%rip),%rdi        # 0xaf1d23e
  3d:	67                   	addr32
  3e:	48                   	rex.W
  3f:	0f                   	.byte 0xf