usb 1-1: DVB: registering adapter 1 frontend 0 (Realtek RTL2832 (DVB-T))...
dvbdev: dvb_create_media_entity: media entity 'Realtek RTL2832 (DVB-T)' registered.
DVB: Unable to find symbol r820t_attach()
------------[ cut here ]------------
ODEBUG: free active (active state 0) object: ffff888043af36e8 object type: timer_list hint: rtl2832_i2c_gate_work+0x0/0x100 drivers/media/dvb-frontends/rtl2832.c:-1
WARNING: lib/debugobjects.c:632 at debug_print_object+0xec/0x230 lib/debugobjects.c:629, CPU#0: kworker/0:0/9
Modules linked in:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:debug_print_object+0x18a/0x230 lib/debugobjects.c:629
Code: f8 48 c1 e8 03 80 3c 18 00 74 08 4c 89 ff e8 ed 8c 6e fd 4d 8b 0f 4c 89 ef 48 8b 74 24 08 48 89 ea 44 89 e1 4d 89 f0 ff 34 24 <67> 48 0f b9 3a 48 83 c4 08 ff 05 c3 b9 ec 0a 48 83 c4 10 5b 41 5c
RSP: 0018:ffffc900000e6740 EFLAGS: 00010246
RAX: 1ffffffff169eac8 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffffffff8baa7e20 RSI: ffffffff8baa78a0 RDI: ffffffff8fb71db0
RBP: ffffffff8baa7e20 R08: ffff888043af36e8 R09: ffffffff8b4f69c0
R10: dffffc0000000000 R11: ffffffff81b13720 R12: 0000000000000000
R13: ffffffff8fb71db0 R14: ffff888043af36e8 R15: ffffffff8b4f5640
FS:  0000000000000000(0000) GS:ffff888125cd3000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a641b0e9c CR3: 0000000042b60000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __debug_check_no_obj_freed lib/debugobjects.c:1116 [inline]
 debug_check_no_obj_freed+0x3a2/0x470 lib/debugobjects.c:1146
 slab_free_hook mm/slub.c:2631 [inline]
 slab_free mm/slub.c:6258 [inline]
 kfree+0x13e/0x6c0 mm/slub.c:6573
 i2c_device_remove+0x88/0x220 drivers/i2c/i2c-core-base.c:631
 device_remove drivers/base/dd.c:619 [inline]
 __device_release_driver drivers/base/dd.c:1352 [inline]
 device_release_driver_internal+0x46f/0x870 drivers/base/dd.c:1375
 bus_remove_device+0x45a/0x570 drivers/base/bus.c:657
 device_del+0x52b/0x900 drivers/base/core.c:3895
 device_unregister+0x21/0xf0 drivers/base/core.c:3936
 rtl28xxu_frontend_detach+0x168/0x210 drivers/media/usb/dvb-usb-v2/rtl28xxu.c:1105
 dvb_usbv2_adapter_frontend_exit drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:733 [inline]
 dvb_usbv2_adapter_exit drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:830 [inline]
 dvb_usbv2_exit+0x44c/0xb80 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:844
 dvb_usbv2_probe+0x4c0/0x3c20 drivers/media/usb/dvb-usb-v2/dvb_usb_core.c:994
 usb_probe_interface+0x659/0xc70 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x267/0xaf0 drivers/base/dd.c:709
 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
 __device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c8/0x450 drivers/base/dd.c:1101
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
 bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
 device_add+0x7e9/0xbb0 drivers/base/core.c:3706
 usb_set_configuration+0x1a87/0x2110 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c4/0x3b0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x267/0xaf0 drivers/base/dd.c:709
 __driver_probe_device+0x1ef/0x380 drivers/base/dd.c:871
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:901
 __device_attach_driver+0x279/0x430 drivers/base/dd.c:1029
 bus_for_each_drv+0x25b/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c8/0x450 drivers/base/dd.c:1101
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1156
 bus_probe_device+0x12d/0x220 drivers/base/bus.c:613
 device_add+0x7e9/0xbb0 drivers/base/core.c:3706
 usb_new_device+0x9f8/0x16e0 drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x2a49/0x4f60 drivers/usb/core/hub.c:5953
 process_one_work+0x9a3/0x1710 kernel/workqueue.c:3312
 process_scheduled_works kernel/workqueue.c:3403 [inline]
 worker_thread+0xba8/0x11e0 kernel/workqueue.c:3489
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	f8                   	clc
   1:	48 c1 e8 03          	shr    $0x3,%rax
   5:	80 3c 18 00          	cmpb   $0x0,(%rax,%rbx,1)
   9:	74 08                	je     0x13
   b:	4c 89 ff             	mov    %r15,%rdi
   e:	e8 ed 8c 6e fd       	call   0xfd6e8d00
  13:	4d 8b 0f             	mov    (%r15),%r9
  16:	4c 89 ef             	mov    %r13,%rdi
  19:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  1e:	48 89 ea             	mov    %rbp,%rdx
  21:	44 89 e1             	mov    %r12d,%ecx
  24:	4d 89 f0             	mov    %r14,%r8
  27:	ff 34 24             	push   (%rsp)
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 08          	add    $0x8,%rsp
  33:	ff 05 c3 b9 ec 0a    	incl   0xaecb9c3(%rip)        # 0xaecb9fc
  39:	48 83 c4 10          	add    $0x10,%rsp
  3d:	5b                   	pop    %rbx
  3e:	41 5c                	pop    %r12