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BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline]
BUG: KASAN: use-after-free in __mutex_lock_common+0xb10/0x1f60 kernel/locking/mutex.c:681
Read of size 8 at addr ffff0000ed920060 by task khidpd_10cf00c5/8125

CPU: 0 PID: 8125 Comm: khidpd_10cf00c5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 dump_backtrace+0x1c0/0x1ec 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+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 __mutex_waiter_is_first kernel/locking/mutex.c:197 [inline]
 __mutex_lock_common+0xb10/0x1f60 kernel/locking/mutex.c:681
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 l2cap_unregister_user+0x70/0x18c net/bluetooth/l2cap_core.c:1895
 hidp_session_thread+0x3e8/0x478 net/bluetooth/hidp/core.c:1305
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

The buggy address belongs to the physical page:
page:0000000030ba04fc refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d920
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 fffffc0003811208 ffff00019f56eeb0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ed91ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ed91ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000ed920000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                       ^
 ffff0000ed920080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ed920100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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