ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
kobject: kobject_add_internal failed for hci4:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci4: failed to register connection device
Unable to handle kernel paging request at virtual address dfff80000000004b
KASAN: null-ptr-deref in range [0x0000000000000258-0x000000000000025f]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff80000000004b] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: hci4 hci_rx_work
pstate: 23400005 (nzCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : kasan_byte_accessible+0x10/0x20 mm/kasan/generic.c:199
lr : __kasan_check_byte+0x20/0x54 mm/kasan/common.c:567
sp : ffff800099327270
x29: ffff800099327270 x28: ffff80008f7c1000 x27: ffff0000c3078000
x26: da968000892cb4bc x25: 0000000000000000 x24: 0000000000000001
x23: 0000000000000000 x22: 0000000000000258 x21: 0000000000000258
x20: 0000000000000000 x19: ffff8000892cb4bc x18: 00000000ffffffff
x17: ffff800093507000 x16: ffff80008b007230 x15: 0000000000000001
x14: 1fffe0001eb3a421 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000100000 x10: 0000000000000003 x9 : dfff800000000000
x8 : 000000000000004b x7 : ffff800083124c28 x6 : ffff80008a2c6890
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000000 x1 : ffff8000892cb4bc x0 : 0000000000000258
Call trace:
 kasan_mem_to_shadow include/linux/kasan.h:64 [inline] (P)
 kasan_byte_accessible+0x10/0x20 mm/kasan/generic.c:199 (P)
 kasan_check_byte include/linux/kasan.h:399 [inline]
 lock_acquire+0xb0/0x2e0 kernel/locking/lockdep.c:5842
 lock_sock_nested+0x58/0x118 net/core/sock.c:3733
 lock_sock include/net/sock.h:1667 [inline]
 l2cap_sock_ready_cb+0x4c/0x130 net/bluetooth/l2cap_sock.c:1674
 l2cap_chan_ready net/bluetooth/l2cap_core.c:1263 [inline]
 l2cap_le_start+0x950/0x10c0 net/bluetooth/l2cap_core.c:1375
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1628 [inline]
 l2cap_connect_cfm+0x558/0xd40 net/bluetooth/l2cap_core.c:7304
 hci_connect_cfm+0x98/0x134 include/net/bluetooth/hci_core.h:2050
 le_conn_complete_evt+0x9f4/0xe84 net/bluetooth/hci_event.c:5755
 hci_le_conn_complete_evt+0x114/0x3f8 net/bluetooth/hci_event.c:5781
 hci_le_meta_evt+0x2cc/0x4b0 net/bluetooth/hci_event.c:7208
 hci_event_func net/bluetooth/hci_event.c:7516 [inline]
 hci_event_packet+0x6bc/0xf04 net/bluetooth/hci_event.c:7573
 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4071
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3400
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844
Code: d503245f d343fc08 d2d00009 f2fbffe9 (38696908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	d503245f 	bti	c
   4:	d343fc08 	lsr	x8, x0, #3
   8:	d2d00009 	mov	x9, #0x800000000000        	// #140737488355328
   c:	f2fbffe9 	movk	x9, #0xdfff, lsl #48
* 10:	38696908 	ldrb	w8, [x8, x9] <-- trapping instruction