==================================================================
BUG: KASAN: use-after-free in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
Read of size 8 at addr ffffaf8013e87ff0 by task syz-executor.1/3288

CPU: 0 PID: 3288 Comm: syz-executor.1 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

The buggy address belongs to the page:
page:ffffaf807abe25f8 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x94087
flags: 0x9000000000(section=18|node=0|zone=0)
raw: 0000009000000000 ffffaf807ad2adb8 ffffaf807abe25b8 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 0x102cc2(GFP_HIGHUSER|__GFP_NOWARN), pid 3227, ts 1181222893100, free_ts 1181401131400
 __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
 vm_area_alloc_pages mm/vmalloc.c:2902 [inline]
 __vmalloc_area_node mm/vmalloc.c:2962 [inline]
 __vmalloc_node_range+0x946/0xab2 mm/vmalloc.c:3107
 __vmalloc_node mm/vmalloc.c:3157 [inline]
 __vmalloc+0x76/0x8e mm/vmalloc.c:3171
 snd_dma_vmalloc_alloc+0x46/0x5a sound/core/memalloc.c:309
 __snd_dma_alloc_pages+0x48/0x70 sound/core/memalloc.c:39
 snd_dma_alloc_dir_pages+0xba/0x124 sound/core/memalloc.c:73
 do_alloc_pages sound/core/pcm_memory.c:48 [inline]
 snd_pcm_lib_malloc_pages+0x26c/0x4f8 sound/core/pcm_memory.c:424
 snd_pcm_hw_params+0x8a0/0xc34 sound/core/pcm_native.c:719
 snd_pcm_kernel_ioctl+0x122/0x1fc sound/core/pcm_native.c:3372
 snd_pcm_oss_change_params_locked+0xe72/0x260a sound/core/oss/pcm_oss.c:960
 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1104 [inline]
 snd_pcm_oss_get_active_substream+0x120/0x14e sound/core/oss/pcm_oss.c:1121
 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1778 [inline]
 snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1770 [inline]
 snd_pcm_oss_ioctl+0xf22/0x299e sound/core/oss/pcm_oss.c:2632
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+0x6a/0x31e mm/page_alloc.c:3404
 free_the_page mm/page_alloc.c:706 [inline]
 __free_pages+0xe2/0x112 mm/page_alloc.c:5474
 __vunmap+0x67e/0x8c4 mm/vmalloc.c:2635
 __vfree+0x70/0x104 mm/vmalloc.c:2683
 vfree+0x9a/0xdc mm/vmalloc.c:2714
 snd_dma_vmalloc_free+0x2a/0x34 sound/core/memalloc.c:314
 snd_dma_free_pages+0x44/0x58 sound/core/memalloc.c:126
 do_free_pages.part.0+0x98/0xc8 sound/core/pcm_memory.c:65
 do_free_pages sound/core/pcm_memory.c:453 [inline]
 snd_pcm_lib_free_pages+0xc6/0x164 sound/core/pcm_memory.c:463
 do_hw_free sound/core/pcm_native.c:831 [inline]
 snd_pcm_release_substream.part.0+0x19e/0x1a0 sound/core/pcm_native.c:2641
 snd_pcm_release_substream+0x4c/0x60 sound/core/pcm_native.c:2635
 snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2407 [inline]
 snd_pcm_oss_release_file sound/core/oss/pcm_oss.c:2399 [inline]
 snd_pcm_oss_release+0xc8/0x1b4 sound/core/oss/pcm_oss.c:2586
 __fput+0x164/0x502 fs/file_table.c:311
 ____fput+0x1a/0x24 fs/file_table.c:344

Memory state around the buggy address:
 ffffaf8013e87e80: ff ff ff ff 00 00 00 00 00 00 00 00 00 00 00 00
 ffffaf8013e87f00: 00 00 00 00 00 00 00 00 00 00 00 00 ff ff ff ff
>ffffaf8013e87f80: 00 00 00 00 00 00 00 00 ff ff ff ff ff ff ff ff
                                                             ^
 ffffaf8013e88000: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 f3
 ffffaf8013e88080: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================