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BUG: KASAN: stack-out-of-bounds in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
Read of size 8 at addr ffffaf801443be10 by task syz-executor.1/2038

CPU: 0 PID: 2038 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
[<ffffffff80162ac8>] stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122
[<ffffffff80473abe>] kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38

The buggy address belongs to the page:
page:ffffaf807abfc098 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9463b
flags: 0x9000000000(section=18|node=0|zone=0)
raw: 0000009000000000 0000000000000000 ffffaf807abfc0a0 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
raw: 00000000000007ff
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x400dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), pid 2036, ts 635432696300, free_ts 506284181100
 __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_node include/linux/gfp.h:572 [inline]
 alloc_pages_node include/linux/gfp.h:595 [inline]
 alloc_thread_stack_node kernel/fork.c:262 [inline]
 dup_task_struct kernel/fork.c:887 [inline]
 copy_process+0x482/0x3c34 kernel/fork.c:1998
 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+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
 __free_slab+0x122/0x27c mm/slub.c:2028
 free_slab mm/slub.c:2043 [inline]
 discard_slab+0x4c/0x7a mm/slub.c:2049
 __slab_free+0x20a/0x29c mm/slub.c:3414
 do_slab_free mm/slub.c:3497 [inline]
 ___cache_free+0x17c/0x354 mm/slub.c:3516
 qlink_free mm/kasan/quarantine.c:157 [inline]
 qlist_free_all+0x7c/0x132 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14c/0x1c8 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x5c/0x98 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 kmem_cache_alloc_node+0x368/0x41c mm/slub.c:3266
 __alloc_skb+0x234/0x2e4 net/core/skbuff.c:414
 alloc_skb_fclone include/linux/skbuff.h:1208 [inline]
 tcp_stream_alloc_skb+0x70/0x4c0 net/ipv4/tcp.c:861
 tcp_sendmsg_locked+0x880/0x1d9e net/ipv4/tcp.c:1281
 tcp_sendmsg+0x32/0x4e net/ipv4/tcp.c:1440

Memory state around the buggy address:
 ffffaf801443bd00: 00 00 00 00 00 00 00 00 00 00 00 00 f2 f2 f2 f2
 ffffaf801443bd80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffaf801443be00: f3 f3 f3 f3 00 00 00 00 f1 f1 f1 f1 00 00 00 f3
                         ^
 ffffaf801443be80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffaf801443bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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