------------[ cut here ]------------ Device '2-002c' does not have a release() function, it is broken and must be fixed. See Documentation/core-api/kobject.rst. WARNING: drivers/base/core.c:2638 at device_release+0x1da/0x270 drivers/base/core.c:2638, CPU#2: kworker/2:0/24 Modules linked in: CPU: 2 UID: 0 PID: 24 Comm: kworker/2:0 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 Workqueue: usb_hub_wq hub_event RIP: 0010:device_release+0x1dd/0x270 drivers/base/core.c:2638 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 93 00 00 00 48 8b 6b 50 48 85 ed 74 19 e8 2d 8b af fb 48 8d 3d 26 05 d3 0a 48 89 ee <67> 48 0f b9 3a e9 eb fe ff ff e8 14 8b af fb 48 89 da 48 b8 00 00 RSP: 0018:ffffc9000062f500 EFLAGS: 00010283 RAX: 0000000000011fda RBX: ffff88802d7cf020 RCX: ffffc9002ee25000 RDX: 0000000000100000 RSI: ffff888059b58d80 RDI: ffffffff912ded80 RBP: ffff888059b58d80 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888053cd3800 R13: dffffc0000000000 R14: ffff888059b58d80 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880d5fec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000560e831219a8 CR3: 000000005014a000 CR4: 0000000000352ef0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device drivers/base/core.c:3880 [inline] device_unregister+0x2f/0xe0 drivers/base/core.c:4003 i2c_unregister_device+0xf5/0x270 drivers/i2c/i2c-core-base.c:1075 i2c_deregister_clients+0x255/0x460 drivers/i2c/i2c-core-base.c:1782 i2c_del_adapter+0x124/0x2d0 drivers/i2c/i2c-core-base.c:1820 em28xx_i2c_unregister+0x47/0x70 drivers/media/usb/em28xx/em28xx-i2c.c:1029 em28xx_release_resources+0xe0/0x1b0 drivers/media/usb/em28xx/em28xx-cards.c:3739 em28xx_usb_disconnect.cold+0x17d/0x253 drivers/media/usb/em28xx/em28xx-cards.c:4427 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:618 [inline] device_remove+0x12a/0x180 drivers/base/dd.c:610 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664 device_del+0x376/0x9b0 drivers/base/core.c:3961 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2345 hub_port_connect drivers/usb/core/hub.c:5415 [inline] hub_port_connect_change drivers/usb/core/hub.c:5715 [inline] port_event drivers/usb/core/hub.c:5879 [inline] hub_event+0x1bb1/0x4420 drivers/usb/core/hub.c:5961 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: df 48 89 fisttps -0x77(%rax) 3: fa cli 4: 48 c1 ea 03 shr $0x3,%rdx 8: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) c: 0f 85 93 00 00 00 jne 0xa5 12: 48 8b 6b 50 mov 0x50(%rbx),%rbp 16: 48 85 ed test %rbp,%rbp 19: 74 19 je 0x34 1b: e8 2d 8b af fb call 0xfbaf8b4d 20: 48 8d 3d 26 05 d3 0a lea 0xad30526(%rip),%rdi # 0xad3054d 27: 48 89 ee mov %rbp,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 eb fe ff ff jmp 0xffffff1f 34: e8 14 8b af fb call 0xfbaf8b4d 39: 48 89 da mov %rbx,%rdx 3c: 48 rex.W 3d: b8 .byte 0xb8