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BUG: KASAN: use-after-free in walk_stackframe+0x11c/0x260 arch/riscv/kernel/stacktrace.c:57
Read of size 8 at addr ffffaf800c0dbf80 by task syz-executor.1/2040

CPU: 0 PID: 2040 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

The buggy address belongs to the page:
page:ffffaf807a9acd98 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8c2db
flags: 0x8800000000(section=17|node=0|zone=0)
raw: 0000008800000000 0000000000000000 ffffffff7a9a0101 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 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2015, ts 444949025800, free_ts 732723938400
 __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+0x25a/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]
 kmem_cache_alloc_node+0x1f2/0x41c 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
 inet_sendmsg+0x74/0x94 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:705 [inline]
 sock_sendmsg+0xa0/0xc4 net/socket.c:725
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]
 __kmalloc_node_track_caller+0x174/0x362 mm/slub.c:4957
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0xee/0x2e4 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1158 [inline]
 alloc_uevent_skb+0x68/0x11e lib/kobject_uevent.c:290
 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
 kobject_uevent_net_broadcast lib/kobject_uevent.c:412 [inline]
 kobject_uevent_env+0xc3a/0xdfe lib/kobject_uevent.c:593
 kobject_uevent+0x22/0x2e lib/kobject_uevent.c:642

Memory state around the buggy address:
 ffffaf800c0dbe80: ff ff ff ff 00 00 00 00 00 00 00 00 ff ff ff ff
 ffffaf800c0dbf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffffaf800c0dbf80: ff ff ff ff ff ff ff ff ff ff ff ff f1 f1 f1 f1
                   ^
 ffffaf800c0dc000: 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00
 ffffaf800c0dc080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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