------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff8880757a1460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:190 WARNING: lib/debugobjects.c:612 at 0x0, CPU#1: syz-executor/5837 Modules linked in: CPU: 1 UID: 0 PID: 5837 Comm: syz-executor Tainted: G U L syzkaller #0 PREEMPT(full) Tainted: [U]=USER, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:debug_print_object+0x19b/0x2a0 lib/debugobjects.c:612 Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 4f 48 8d 3d a2 45 e0 0b 41 56 48 8b 14 dd e0 ba f2 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 5c d0 d6 0b 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0018:ffffc90004137958 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffffffff8bf2ba20 RSI: ffffffff8bf2b600 RDI: ffffffff90925990 RBP: 0000000000000001 R08: ffff8880757a1460 R09: ffffffff8b906bc0 R10: ffffffff9088b3d7 R11: ffff888033e50b30 R12: ffffffff8bf2b600 R13: ffffffff8b906c00 R14: ffffffff8a7d7a20 R15: ffffc90004137a58 FS: 0000000000000000(0000) GS:ffff888124a02000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f23c8717d60 CR3: 000000007cab2000 CR4: 00000000003526f0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] debug_check_no_obj_freed+0x4b7/0x600 lib/debugobjects.c:1129 free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0x31a/0x1170 mm/page_alloc.c:2943 hci_release_dev+0x4ef/0x640 net/bluetooth/hci_core.c:2776 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:87 device_release+0xa4/0x240 drivers/base/core.c:2565 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1ef/0x6f0 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3797 vhci_release+0x185/0x230 drivers/bluetooth/hci_vhci.c:691 __fput+0x402/0xb70 fs/file_table.c:468 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x87f/0x2bd0 kernel/exit.c:971 do_group_exit+0xd3/0x2a0 kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1121 x64_sys_call+0x151c/0x1740 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f549318f7c9 Code: Unable to access opcode bytes at 0x7f549318f79f. RSP: 002b:00007ffce7ce62b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f549318f7c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043 RBP: 00007f5493215978 R08: 00007ffce7ce4057 R09: 00000000000927c0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 0000000000065179 R15: 00007ffce7ce6470 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff (bad) 8: df 48 89 fisttps -0x77(%rax) b: fa cli c: 48 c1 ea 03 shr $0x3,%rdx 10: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 14: 75 4f jne 0x65 16: 48 8d 3d a2 45 e0 0b lea 0xbe045a2(%rip),%rdi # 0xbe045bf 1d: 41 56 push %r14 1f: 48 8b 14 dd e0 ba f2 mov -0x740d4520(,%rbx,8),%rdx 26: 8b 27: 4c 89 e6 mov %r12,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 58 pop %rax 30: 83 05 5c d0 d6 0b 01 addl $0x1,0xbd6d05c(%rip) # 0xbd6d093 37: 48 83 c4 18 add $0x18,%rsp 3b: 5b pop %rbx 3c: 5d pop %rbp 3d: 41 5c pop %r12 3f: 41 rex.B