syzbot

==================================================================
BUG: KASAN: wild-memory-access in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: wild-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: wild-memory-access in l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
BUG: KASAN: wild-memory-access in l2cap_conn_ready net/bluetooth/l2cap_core.c:1625 [inline]
BUG: KASAN: wild-memory-access in l2cap_connect_cfm+0x500/0xd40 net/bluetooth/l2cap_core.c:7288
Read of size 4 at addr deacfffffffffc8c by task kworker/u9:3/6532

CPU: 1 UID: 0 PID: 6532 Comm: kworker/u9:3 Not tainted 6.16.0-rc5-syzkaller-gec4801305969 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci1 hci_rx_work
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_report+0x58/0x84 mm/kasan/report.c:524
 kasan_report+0xb0/0x110 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 __kasan_check_read+0x20/0x30 mm/kasan/shadow.c:31
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1625 [inline]
 l2cap_connect_cfm+0x500/0xd40 net/bluetooth/l2cap_core.c:7288
 hci_connect_cfm+0x98/0x134 include/net/bluetooth/hci_core.h:2056
 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:7164
 hci_event_func net/bluetooth/hci_event.c:7472 [inline]
 hci_event_packet+0x60c/0xe9c net/bluetooth/hci_event.c:7529
 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3402
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:843
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Unable to handle kernel paging request at virtual address fbd51fffffffff91
KASAN: maybe wild-memory-access in range [0xdeacfffffffffc88-0xdeacfffffffffc8f]
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, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[fbd51fffffffff91] address between user and kernel address ranges
Internal error: Oops: 0000000096000004 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 6532 Comm: kworker/u9:3 Tainted: G    B               6.16.0-rc5-syzkaller-gec4801305969 #0 PREEMPT 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: hci1 hci_rx_work
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline]
pc : atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
pc : l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
pc : l2cap_conn_ready net/bluetooth/l2cap_core.c:1625 [inline]
pc : l2cap_connect_cfm+0x50c/0xd40 net/bluetooth/l2cap_core.c:7288
lr : instrument_atomic_read include/linux/instrumented.h:68 [inline]
lr : atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
lr : l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline]
lr : l2cap_conn_ready net/bluetooth/l2cap_core.c:1625 [inline]
lr : l2cap_connect_cfm+0x500/0xd40 net/bluetooth/l2cap_core.c:7288
sp : ffff8000a2c07520
x29: ffff8000a2c075c0 x28: dfff800000000000 x27: 1fffe0001d1ff007
x26: ffff0000c761b81a x25: 0000000000000080 x24: deacfffffffffc8c
x23: 1fffe00018ec3703 x22: dead000000000100 x21: ffff0000c761bac0
x20: ffff0000e8ff803d x19: ffff0000c761b800 x18: 1fffe000337d8876
x17: 0000000000000000 x16: ffff80008aefc458 x15: 0000000000000001
x14: 1ffff000125d92f4 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000100000 x10: 0000000000011acd x9 : 0000000000000007
x8 : 1bd59fffffffff91 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000a2c06d98 x4 : ffff80008f766be0 x3 : ffff8000803b8030
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] (P)
 atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] (P)
 l2cap_chan_lock include/net/bluetooth/l2cap.h:827 [inline] (P)
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1625 [inline] (P)
 l2cap_connect_cfm+0x50c/0xd40 net/bluetooth/l2cap_core.c:7288 (P)
 hci_connect_cfm+0x98/0x134 include/net/bluetooth/hci_core.h:2056
 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:7164
 hci_event_func net/bluetooth/hci_event.c:7472 [inline]
 hci_event_packet+0x60c/0xe9c net/bluetooth/hci_event.c:7529
 hci_rx_work+0x320/0xb18 net/bluetooth/hci_core.c:4070
 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x958/0xed8 kernel/workqueue.c:3402
 kthread+0x5fc/0x75c kernel/kthread.c:464
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:843
Code: 977ff0c6 d343ff08 12000b09 11000d29 (38fc6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	977ff0c6 	bl	0xfffffffffdffc318
   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