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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 ffffaf802011be50 by task syz-executor.1/3370

CPU: 0 PID: 3370 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

Allocated by task 64:
(stack is not available)

Freed by task 1:
(stack is not available)

The buggy address belongs to the object at ffffaf802011bdc0
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 144 bytes inside of
 232-byte region [ffffaf802011bdc0, ffffaf802011bea8)
The buggy address belongs to the page:
page:ffffaf807af4df98 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa031b
flags: 0xa000000200(slab|section=20|node=0|zone=0)
raw: 000000a000000200 ffffaf807aa9b670 0000000000000008 ffffaf8009591500
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 2042, ts 693564647100, free_ts 692178810100
 __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
 kmem_cache_alloc_bulk+0x268/0x376 mm/slub.c:3706
 napi_skb_cache_get+0xe6/0x10c net/core/skbuff.c:176
 __alloc_skb+0xb2/0x2e4 net/core/skbuff.c:412
 __napi_alloc_skb+0x72/0x214 net/core/skbuff.c:568
 napi_alloc_skb include/linux/skbuff.h:3005 [inline]
 page_to_skb+0x16e/0x70e drivers/net/virtio_net.c:437
 receive_mergeable drivers/net/virtio_net.c:1039 [inline]
 receive_buf+0xa20/0x3e50 drivers/net/virtio_net.c:1149
 virtnet_receive drivers/net/virtio_net.c:1441 [inline]
 virtnet_poll+0x39c/0x986 drivers/net/virtio_net.c:1550
 __napi_poll+0x7c/0x358 net/core/dev.c:6365
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:
 ffffaf802011bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffffaf802011bd80: fc fc fc fc fc fc fc fc fa fb fb fb 00 00 00 00
>ffffaf802011be00: 00 00 00 00 00 00 00 00 fb fb fb fb 00 00 00 00
                                                 ^
 ffffaf802011be80: f1 f1 f1 f1 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
 ffffaf802011bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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