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BUG: KASAN: slab-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
Read of size 8 at addr ffffaf8022213e00 by task syz-executor.0/2853

CPU: 0 PID: 2853 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
[<ffffffff8000a052>] walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
[<ffffffff8000a4a4>] arch_stack_walk+0x2c/0x3c arch/riscv/kernel/stacktrace.c:146
[<ffffffff80162ac8>] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122
[<ffffffff80473abe>] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38

Allocated by task 66822:
(stack is not available)

The buggy address belongs to the object at ffffaf8022213dc0
 which belongs to the cache pid_2 of size 240
The buggy address is located 64 bytes inside of
 240-byte region [ffffaf8022213dc0, ffffaf8022213eb0)
The buggy address belongs to the page:
page:ffffaf807afe2558 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa2413
memcg:ffffaf800f2d9d01
flags: 0xa000000200(slab|section=20|node=0|zone=0)
raw: 000000a000000200 0000000000000000 0000000000000122 ffffaf800f2ba280
raw: 0000000000000000 00000000800c000c 00000001ffffffff ffffaf800f2d9d01
raw: 00000000000007ff
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 2050, ts 981006386300, free_ts 979493876700
 __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
 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x76/0x2cc mm/slub.c:2004
 ___slab_alloc+0x56e/0x918 mm/slub.c:3018
 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105
 slab_alloc_node mm/slub.c:3196 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x39c/0x3de mm/slub.c:3243
 alloc_pid+0xac/0x8aa kernel/pid.c:180
 copy_process+0x26ae/0x3c34 kernel/fork.c:2180
 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
 get_signal+0x3b8/0x1754 kernel/signal.c:2862
 do_signal arch/riscv/kernel/signal.c:271 [inline]
 do_notify_resume+0x11a/0xa56 arch/riscv/kernel/signal.c:317
 ret_from_exception+0x0/0x10

Memory state around the buggy address:
 ffffaf8022213d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffaf8022213d80: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
>ffffaf8022213e00: fc fc fc fc f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3
                   ^
 ffffaf8022213e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffaf8022213f00: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
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