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BUG: KASAN: use-after-free in __bfs+0x154/0x394 kernel/locking/lockdep.c:1708
Read of size 8 at addr ffffaf8022173ed0 by task syz-executor.0/6978

CPU: 0 PID: 6978 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
[<ffffffff80113c26>] check_prev_add kernel/locking/lockdep.c:3063 [inline]
[<ffffffff80113c26>] check_prevs_add kernel/locking/lockdep.c:3186 [inline]
[<ffffffff80113c26>] validate_chain kernel/locking/lockdep.c:3801 [inline]
[<ffffffff80113c26>] __lock_acquire+0x19a4/0x333e kernel/locking/lockdep.c:5027

The buggy address belongs to the page:
page:ffffaf807afdf858 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa2373
flags: 0xa000000000(section=20|node=0|zone=0)
raw: 000000a000000000 ffffaf807a985e18 ffffaf807a965a48 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
raw: 00000000000007ff
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT), pid 2050, ts 3786290747700, free_ts 3791396387000
 __set_page_owner+0x48/0x136 mm/page_owner.c:183
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427
 prep_new_page mm/page_alloc.c:2434 [inline]
 get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165
 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389
 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271
 __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
 pte_alloc_one include/asm-generic/pgalloc.h:85 [inline]
 __pte_alloc+0x96/0x394 mm/memory.c:465
 copy_pte_range mm/memory.c:1025 [inline]
 copy_pmd_range mm/memory.c:1160 [inline]
 copy_pud_range mm/memory.c:1197 [inline]
 copy_p4d_range mm/memory.c:1221 [inline]
 copy_page_range+0x1532/0x236c mm/memory.c:1294
 dup_mmap kernel/fork.c:612 [inline]
 dup_mm+0xb5c/0xe10 kernel/fork.c:1451
 copy_mm kernel/fork.c:1503 [inline]
 copy_process+0x25da/0x3c34 kernel/fork.c:2164
 kernel_clone+0xee/0x920 kernel/fork.c:2555
 __do_sys_clone+0xf2/0x12e kernel/fork.c:2672
 sys_clone+0x32/0x44 kernel/fork.c:2640
 ret_from_syscall+0x0/0x2
page last free stack trace:
 __reset_page_owner+0x4a/0xea mm/page_owner.c:142
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1352 [inline]
 free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page_list+0x148/0x7fe mm/page_alloc.c:3441
 release_pages+0x3f0/0xad0 mm/swap.c:980
 free_pages_and_swap_cache+0x74/0x86 mm/swap_state.c:320
 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:243 [inline]
 tlb_flush_mmu mm/mmu_gather.c:250 [inline]
 tlb_finish_mmu+0xe8/0x29a mm/mmu_gather.c:341
 exit_mmap+0x170/0x412 mm/mmap.c:3180
 __mmput kernel/fork.c:1114 [inline]
 mmput+0xee/0x2c2 kernel/fork.c:1135
 exit_mm kernel/exit.c:507 [inline]
 do_exit+0x6f2/0x18fc kernel/exit.c:793
 do_group_exit+0x90/0x17e kernel/exit.c:935
 __do_sys_exit_group kernel/exit.c:946 [inline]
 __wake_up_parent+0x0/0x4a kernel/exit.c:944
 ret_from_syscall+0x0/0x2

Memory state around the buggy address:
 ffffaf8022173d80: f1 f1 f1 f1 00 f3 f3 f3 ff ff ff ff ff ff ff ff
 ffffaf8022173e00: ff ff ff ff ff ff ff ff ff ff ff ff 00 00 00 00
>ffffaf8022173e80: f1 f1 f1 f1 00 f2 f2 f2 ff ff ff ff 00 00 00 f3
                                                 ^
 ffffaf8022173f00: f3 f3 f3 f3 ff ff ff ff ff ff ff ff ff ff ff ff
 ffffaf8022173f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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