------------[ cut here ]------------ ODEBUG: free active (active state 1) object type: rcu_head hint: 0x0 WARNING: CPU: 0 PID: 8902 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 0 PID: 8902 Comm: kworker/u4:6 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usbip_event event_handler RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd c0 94 9e 89 4c 89 ee 48 c7 c7 c0 88 9e 89 e8 ac c1 f6 04 <0f> 0b 83 05 55 0d 40 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc90001d97b40 EFLAGS: 00010082 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff888026c2e300 RSI: ffffffff815b7455 RDI: fffff520003b2f5a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815b05fe R11: 0000000000000000 R12: ffffffff894d0580 R13: ffffffff899e8f00 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000568000 CR3: 00000000172b4000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] debug_check_no_obj_freed+0x301/0x420 lib/debugobjects.c:1018 kmem_cache_free+0x13f/0x1c0 mm/slab.c:3696 __put_task_struct+0x267/0x3f0 kernel/fork.c:742 put_task_struct include/linux/sched/task.h:111 [inline] vhci_shutdown_connection+0x22a/0x340 drivers/usb/usbip/vhci_hcd.c:1023 event_handler+0x1fe/0x500 drivers/usb/usbip/usbip_event.c:92 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296