------------[ cut here ]------------ ODEBUG: free active (active state 0) object: ffff888027d45460 object type: timer_list hint: hci_devcd_timeout+0x0/0x2e0 net/bluetooth/coredump.c:288 WARNING: lib/debugobjects.c:612 at debug_print_object+0x18e/0x2a0 lib/debugobjects.c:612, CPU#0: syz.0.2250/15808 Modules linked in: CPU: 0 UID: 0 PID: 15808 Comm: syz.0.2250 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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 c7 d4 0b 41 56 48 8b 14 dd 60 47 fa 8b 4c 89 e6 <67> 48 0f b9 3a 58 83 05 7c 89 ca 0b 01 48 83 c4 18 5b 5d 41 5c 41 RSP: 0018:ffffc90004cc7748 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffffffff8bfa46a0 RSI: ffffffff8bfa42c0 RDI: ffffffff90c1e5d0 RBP: 0000000000000001 R08: ffff888027d45460 R09: ffffffff8b92b980 R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8bfa42c0 R13: ffffffff8b92b9c0 R14: ffffffff8a8076e0 R15: ffffc90004cc7848 FS: 0000000000000000(0000) GS:ffff8881245e2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055978cf78988 CR3: 0000000078e88000 CR4: 00000000003526f0 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1099 [inline] debug_check_no_obj_freed+0x4da/0x630 lib/debugobjects.c:1129 free_pages_prepare mm/page_alloc.c:1440 [inline] __free_frozen_pages+0x358/0x1130 mm/page_alloc.c:2973 hci_release_dev+0x4ef/0x630 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+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3797 vhci_release+0x185/0x230 drivers/bluetooth/hci_vhci.c:691 __fput+0x3ff/0xb40 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+0x829/0x2a30 kernel/exit.c:971 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop kernel/entry/common.c:75 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline] irqentry_exit+0x1f8/0x670 kernel/entry/common.c:196 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616 RIP: 0033:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 002b:000000000000000a EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f6e92816090 RCX: 00007f6e9259aeb9 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000020003b46 RBP: 00007f6e92608c1f R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6e92816128 R14: 00007f6e92816090 R15: 00007fff266d2c58 ---------------- Code disassembly (best guess): 0: b8 00 00 00 00 mov $0x0,%eax 5: 00 fc add %bh,%ah 7: ff lcall (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 c7 d4 0b lea 0xbd4c7a2(%rip),%rdi # 0xbd4c7bf 1d: 41 56 push %r14 1f: 48 8b 14 dd 60 47 fa mov -0x7405b8a0(,%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 7c 89 ca 0b 01 addl $0x1,0xbca897c(%rip) # 0xbca89b3 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