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BUG: KASAN: use-after-free in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708
Read of size 8 at addr ffffaf8025b43f30 by task syz-executor.0/2967

CPU: 1 PID: 2967 Comm: syz-executor.0 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000a228>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113
[<ffffffff831668cc>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119
[<ffffffff831756ba>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff831756ba>] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106
[<ffffffff8047479e>] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff8010dd9a>] __bfs+0x154/0x394 kernel/locking/lockdep.c:1708
[<ffffffff8010e52a>] __bfs_forwards kernel/locking/lockdep.c:1803 [inline]
[<ffffffff8010e52a>] check_path.constprop.0+0x24/0x46 kernel/locking/lockdep.c:2104
[<ffffffff8010f95c>] check_noncircular+0x11a/0x1fe kernel/locking/lockdep.c:2131

The buggy address belongs to the page:
page:ffffaf807b0e3ad8 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa5d43
flags: 0xa000000000(section=20|node=0|zone=0)
raw: 000000a000000000 ffffaf807b0e5508 ffffaf807b0e3a98 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
raw: 00000000000007ff
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffaf8025b43e00: 00 f3 f3 f3 ff ff ff ff ff ff ff ff ff ff ff ff
 ffffaf8025b43e80: ff ff ff ff ff ff ff ff 00 00 00 00 f1 f1 f1 f1
>ffffaf8025b43f00: 00 f2 f2 f2 ff ff ff ff 00 00 00 f3 f3 f3 f3 f3
                                     ^
 ffffaf8025b43f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffffaf8025b44000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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