==================================================================
BUG: KASAN: wild-memory-access in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: wild-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
BUG: KASAN: wild-memory-access in l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline]
BUG: KASAN: wild-memory-access in l2cap_conn_ready net/bluetooth/l2cap_core.c:1784 [inline]
BUG: KASAN: wild-memory-access in l2cap_connect_cfm+0x4f0/0xd64 net/bluetooth/l2cap_core.c:8365
Read of size 4 at addr deacfffffffffc84 by task kworker/u5:8/4336

CPU: 0 PID: 4336 Comm: kworker/u5:8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: hci4 hci_rx_work
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_report+0x40/0x68 mm/kasan/report.c:423
 kasan_report+0xa8/0x100 mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189
 __kasan_check_read+0x2c/0x3c mm/kasan/shadow.c:31
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
 l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline]
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1784 [inline]
 l2cap_connect_cfm+0x4f0/0xd64 net/bluetooth/l2cap_core.c:8365
 hci_connect_cfm+0x98/0x130 include/net/bluetooth/hci_core.h:1787
 le_conn_complete_evt+0xaa4/0xf8c net/bluetooth/hci_event.c:5851
 hci_le_conn_complete_evt+0x114/0x3f8 net/bluetooth/hci_event.c:5877
 hci_le_meta_evt+0x2c0/0x4a4 net/bluetooth/hci_event.c:7047
 hci_event_func net/bluetooth/hci_event.c:7358 [inline]
 hci_event_packet+0x6ac/0xf08 net/bluetooth/hci_event.c:7413
 hci_rx_work+0x324/0xaa0 net/bluetooth/hci_core.c:4083
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
==================================================================
Unable to handle kernel paging request at virtual address fbd51fffffffff90
KASAN: maybe wild-memory-access in range [0xdeacfffffffffc80-0xdeacfffffffffc87]
Mem abort info:
  ESR = 0x0000000096000004
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x04: level 0 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000004
  CM = 0, WnR = 0
[fbd51fffffffff90] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4336 Comm: kworker/u5:8 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Workqueue: hci4 hci_rx_work
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline]
pc : l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline]
pc : l2cap_conn_ready net/bluetooth/l2cap_core.c:1784 [inline]
pc : l2cap_connect_cfm+0x4fc/0xd64 net/bluetooth/l2cap_core.c:8365
lr : instrument_atomic_read include/linux/instrumented.h:72 [inline]
lr : atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline]
lr : l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline]
lr : l2cap_conn_ready net/bluetooth/l2cap_core.c:1784 [inline]
lr : l2cap_connect_cfm+0x4f0/0xd64 net/bluetooth/l2cap_core.c:8365
sp : ffff800020c17620
x29: ffff800020c176a0 x28: dfff800000000000 x27: 1fffe00019868c07
x26: 0000000000000001 x25: 0000000000000080 x24: deacfffffffffc84
x23: ffff0000d93ff01a x22: dead000000000100 x21: ffff0000d93ff260
x20: ffff0000cc346039 x19: ffff0000d93ff000 x18: ffff800011abbcc0
x17: 1fffe00033ed797e x16: ffff800008042c8c x15: 0000000040000000
x14: 0000000000000002 x13: 0000000000ff0100 x12: 0000000000100000
x11: 0000000000021215 x10: ffff800032b0e000 x9 : 0000000000000007
x8 : 1bd59fffffffff90 x7 : 0000000000000004 x6 : ffff800008251e10
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008191794
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline]
 l2cap_chan_lock include/net/bluetooth/l2cap.h:863 [inline]
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1784 [inline]
 l2cap_connect_cfm+0x4fc/0xd64 net/bluetooth/l2cap_core.c:8365
 hci_connect_cfm+0x98/0x130 include/net/bluetooth/hci_core.h:1787
 le_conn_complete_evt+0xaa4/0xf8c net/bluetooth/hci_event.c:5851
 hci_le_conn_complete_evt+0x114/0x3f8 net/bluetooth/hci_event.c:5877
 hci_le_meta_evt+0x2c0/0x4a4 net/bluetooth/hci_event.c:7047
 hci_event_func net/bluetooth/hci_event.c:7358 [inline]
 hci_event_packet+0x6ac/0xf08 net/bluetooth/hci_event.c:7413
 hci_rx_work+0x324/0xaa0 net/bluetooth/hci_core.c:4083
 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292
 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850
Code: 97cfa5c1 d343ff08 12000b09 11000d29 (38fc6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	97cfa5c1 	bl	0xffffffffff3e9704
   4:	d343ff08 	lsr	x8, x24, #3
   8:	12000b09 	and	w9, w24, #0x7
   c:	11000d29 	add	w9, w9, #0x3
* 10:	38fc6908 	ldrsb	w8, [x8, x28] <-- trapping instruction