Hello, syzbot found the following issue on: HEAD commit: 4fe89d07dcc2 Linux 6.0 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=153e9148880000 kernel config: https://syzkaller.appspot.com/x/.config?x=8b8947ea4cc7fb5d dashboard link: https://syzkaller.appspot.com/bug?extid=1dc86a35505aa14c1115 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/afc7f54b2a64/disk-4fe89d07.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e8dddd4401ab/vmlinux-4fe89d07.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1dc86a35505aa14c1115@xxxxxxxxxxxxxxxxxxxxxxxxx usb 1-1: USB disconnect, device number 20 cdc_ncm 1-1:1.0 usb0: unregister 'cdc_ncm' usb-dummy_hcd.0-1, CDC NCM (NO ZLP) ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: usbnet_deferred_kevent+0x0/0xae0 drivers/net/usb/usbnet.c:1584 WARNING: CPU: 1 PID: 27 at lib/debugobjects.c:505 debug_print_object lib/debugobjects.c:502 [inline] WARNING: CPU: 1 PID: 27 at lib/debugobjects.c:505 __debug_check_no_obj_freed lib/debugobjects.c:989 [inline] WARNING: CPU: 1 PID: 27 at lib/debugobjects.c:505 debug_check_no_obj_freed+0x46b/0x650 lib/debugobjects.c:1020 Modules linked in: CPU: 1 PID: 27 Comm: kworker/1:1 Not tainted 6.0.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: usb_hub_wq hub_event RIP: 0010:debug_print_object lib/debugobjects.c:502 [inline] RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:989 [inline] RIP: 0010:debug_check_no_obj_freed+0x46b/0x650 lib/debugobjects.c:1020 Code: 48 89 ef e8 47 32 a2 fd 48 8b 13 4c 8b 45 00 48 c7 c7 20 71 0a 8b 48 c7 c6 00 6e 0a 8b 44 89 f1 4d 89 f9 31 c0 e8 85 55 16 fd <0f> 0b 48 ba 00 00 00 00 00 fc ff df ff 05 9f cd ea 09 48 8b 5c 24 RSP: 0018:ffffc90000a2f0d8 EFLAGS: 00010246 RAX: 62d25ed28b046b00 RBX: ffffffff8b0a7198 RCX: 0000000000040000 RDX: ffffc90013401000 RSI: 0000000000014bfa RDI: 0000000000014bfb RBP: ffffffff8aac8220 R08: ffffffff816d5a8d R09: ffffed10173667f1 R10: ffffed10173667f1 R11: 1ffff110173667f0 R12: ffff888091fa6c1c R13: ffff888091fa6c28 R14: 0000000000000000 R15: ffffffff85fb5eb0 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f462a01950 CR3: 0000000095603000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> slab_free_hook mm/slub.c:1734 [inline] slab_free_freelist_hook+0xcf/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xda/0x210 mm/slub.c:4567 device_release+0x98/0x1c0 kobject_cleanup+0x235/0x470 lib/kobject.c:673 usb_unbind_interface+0x1f2/0x860 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:550 [inline] __device_release_driver drivers/base/dd.c:1249 [inline] device_release_driver_internal+0x5bc/0x8a0 drivers/base/dd.c:1275 bus_remove_device+0x2fd/0x410 drivers/base/bus.c:529 device_del+0x6ec/0xbe0 drivers/base/core.c:3704 usb_disable_device+0x3dd/0x820 drivers/usb/core/message.c:1419 usb_disconnect+0x346/0x890 drivers/usb/core/hub.c:2235 hub_port_connect+0x296/0x2930 drivers/usb/core/hub.c:5197 hub_port_connect_change+0x619/0xbe0 drivers/usb/core/hub.c:5497 port_event+0xec6/0x13b0 drivers/usb/core/hub.c:5653 hub_event+0x5c1/0xd80 drivers/usb/core/hub.c:5735 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
