------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff88803212d460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:232 WARNING: lib/debugobjects.c:612 at 0x0, CPU#0: syz-executor/5834 Modules linked in: CPU: 0 UID: 0 PID: 5834 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 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 72 88 e4 0b 41 56 48 8b 14 dd 60 e7 f1 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 9c 44 db 0b 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0000:ffffc900040df718 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffffffff8bf1e6a0 RSI: ffffffff8bf1e280 RDI: ffffffff908fa700 RBP: 0000000000000001 R08: ffff88803212d460 R09: ffffffff8b906b80 R10: ffffffff908632d7 R11: 00000000ffffffff R12: ffffffff8bf1e280 R13: ffffffff8b906bc0 R14: ffffffff8a6841f0 R15: ffffc900040df818 FS: 0000000000000000(0000) GS:ffff888124993000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056489fc4d278 CR3: 000000000e184000 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:1401 [inline] __free_frozen_pages+0x31a/0x1160 mm/page_alloc.c:2901 hci_release_dev+0x4ef/0x610 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+0x1e7/0x590 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:973 do_group_exit+0xd3/0x2a0 kernel/exit.c:1114 get_signal+0x2671/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x8c/0x540 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x4ee/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f80c158e1dc Code: Unable to access opcode bytes at 0x7f80c158e1b2. RSP: 002b:00007ffd61643320 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007f80c158e1dc RDX: 0000000000000030 RSI: 00007ffd616433e0 RDI: 00000000000000f9 RBP: 00007ffd6164338c R08: 0000000000000000 R09: 0079746972756365 R10: 00007f80c17b7800 R11: 0000000000000246 R12: 0000000000000276 R13: 00000000000927c0 R14: 000000000009ce3b R15: 00007ffd616433e0 ---------------- 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 72 88 e4 0b lea 0xbe48872(%rip),%rdi # 0xbe4888f 1d: 41 56 push %r14 1f: 48 8b 14 dd 60 e7 f1 mov -0x740e18a0(,%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 9c 44 db 0b 01 addl $0x1,0xbdb449c(%rip) # 0xbdb44d3 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