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BUG: KCSAN: data-race in __delete_from_swap_cache / folio_mapping

write to 0xffffea0004a28668 of 8 bytes by task 31654 on cpu 0:
 __delete_from_swap_cache+0x1e8/0x280 mm/swap_state.c:161
 delete_from_swap_cache+0x73/0xe0 mm/swap_state.c:180
 folio_free_swap+0x188/0x1a0 mm/swapfile.c:1784
 free_swap_cache mm/swap_state.c:228 [inline]
 free_pages_and_swap_cache+0x1f1/0x400 mm/swap_state.c:257
 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
 tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:397 [inline]
 tlb_flush_mmu+0x2dc/0x450 mm/mmu_gather.c:404
 tlb_finish_mmu+0x8d/0x110 mm/mmu_gather.c:497
 vms_clear_ptes+0x28c/0x2d0 mm/vma.c:1235
 vms_clean_up_area mm/vma.c:1247 [inline]
 __mmap_prepare mm/vma.c:2396 [inline]
 __mmap_region mm/vma.c:2651 [inline]
 mmap_region+0x759/0x1630 mm/vma.c:2739
 do_mmap+0x9b3/0xbe0 mm/mmap.c:558
 vm_mmap_pgoff+0x17a/0x2e0 mm/util.c:580
 ksys_mmap_pgoff+0xc2/0x310 mm/mmap.c:604
 x64_sys_call+0x14a3/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004a28668 of 8 bytes by task 31653 on cpu 1:
 folio_mapping+0xdd/0x120 mm/util.c:700
 folio_evictable mm/internal.h:499 [inline]
 sort_folio mm/vmscan.c:4479 [inline]
 scan_folios mm/vmscan.c:4606 [inline]
 isolate_folios mm/vmscan.c:4702 [inline]
 evict_folios+0xdd9/0x3520 mm/vmscan.c:4732
 try_to_shrink_lruvec+0x5b5/0x950 mm/vmscan.c:4907
 lru_gen_shrink_lruvec mm/vmscan.c:5056 [inline]
 shrink_lruvec+0x22e/0x1b50 mm/vmscan.c:5815
 shrink_node_memcgs mm/vmscan.c:6051 [inline]
 shrink_node+0x686/0x2120 mm/vmscan.c:6092
 shrink_zones mm/vmscan.c:6336 [inline]
 do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6398
 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6726
 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2357
 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2800
 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2844
 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5165
 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2507
 vm_area_alloc_pages mm/vmalloc.c:3642 [inline]
 __vmalloc_area_node mm/vmalloc.c:3720 [inline]
 __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3893
 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5074
 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261
 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568
 ip_set_create+0x3c9/0x960 net/netfilter/ipset/ip_set_core.c:1109
 nfnetlink_rcv_msg+0x4c6/0x590 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2552
 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:667
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x142/0x180 net/socket.c:729
 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2614
 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2703
 x64_sys_call+0x191e/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000004ff4 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 31653 Comm: syz.0.9869 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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