================================================================== BUG: KCSAN: data-race in __delete_from_swap_cache / folio_mapping write to 0xffffea0004738828 of 8 bytes by task 4836 on cpu 1: __delete_from_swap_cache+0x200/0x2a0 mm/swap_state.c:162 delete_from_swap_cache+0x75/0xe0 mm/swap_state.c:181 shmem_swapin_folio+0xdfa/0xef0 mm/shmem.c:2398 shmem_get_folio_gfp+0x265/0xd30 mm/shmem.c:2466 shmem_get_folio mm/shmem.c:2639 [inline] shmem_write_begin+0xa7/0x190 mm/shmem.c:3289 generic_perform_write+0x189/0x4b0 mm/filemap.c:4102 shmem_file_write_iter+0xc2/0xe0 mm/shmem.c:3464 do_iter_readv_writev+0x40d/0x4b0 fs/read_write.c:-1 vfs_iter_write+0x265/0x5c0 fs/read_write.c:979 lo_write_bvec drivers/block/loop.c:221 [inline] lo_write_simple drivers/block/loop.c:242 [inline] do_req_filebacked drivers/block/loop.c:496 [inline] loop_handle_cmd drivers/block/loop.c:1943 [inline] loop_process_work+0xaf8/0x1240 drivers/block/loop.c:1978 loop_workfn+0x31/0x40 drivers/block/loop.c:2002 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4de/0xa20 kernel/workqueue.c:3319 worker_thread+0x52c/0x710 kernel/workqueue.c:3400 kthread+0x4b7/0x540 kernel/kthread.c:464 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffffea0004738828 of 8 bytes by task 8509 on cpu 0: folio_mapping+0xdb/0x120 mm/util.c:699 folio_evictable mm/internal.h:480 [inline] sort_folio mm/vmscan.c:4436 [inline] scan_folios mm/vmscan.c:4562 [inline] isolate_folios mm/vmscan.c:4657 [inline] evict_folios+0xd4e/0x2fb0 mm/vmscan.c:4686 try_to_shrink_lruvec+0x405/0x590 mm/vmscan.c:4859 lru_gen_shrink_lruvec mm/vmscan.c:5008 [inline] shrink_lruvec+0x220/0x1970 mm/vmscan.c:5753 shrink_node_memcgs mm/vmscan.c:5989 [inline] shrink_node+0x60b/0x1da0 mm/vmscan.c:6030 shrink_zones mm/vmscan.c:6274 [inline] do_try_to_free_pages+0x3c6/0xc10 mm/vmscan.c:6336 try_to_free_mem_cgroup_pages+0x1e6/0x4a0 mm/vmscan.c:6664 try_charge_memcg+0x364/0x820 mm/memcontrol.c:2305 obj_cgroup_charge_pages+0xc0/0x1a0 mm/memcontrol.c:2696 __memcg_kmem_charge_page+0x9d/0x170 mm/memcontrol.c:2740 __alloc_frozen_pages_noprof+0x1a6/0x360 mm/page_alloc.c:4951 alloc_pages_mpol+0xb6/0x260 mm/mempolicy.c:2301 alloc_frozen_pages_noprof mm/mempolicy.c:2372 [inline] alloc_pages_noprof+0xe8/0x130 mm/mempolicy.c:2392 vm_area_alloc_pages mm/vmalloc.c:3591 [inline] __vmalloc_area_node mm/vmalloc.c:3669 [inline] __vmalloc_node_range_noprof+0x6ea/0xe80 mm/vmalloc.c:3844 __kvmalloc_node_noprof+0x311/0x520 mm/slub.c:5038 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261 hash_netiface_create+0x273/0x730 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0x3b6/0x970 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0x4ba/0x580 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x12f/0x230 net/netlink/af_netlink.c:2534 nfnetlink_rcv+0x187/0x1610 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x605/0x6c0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x609/0x720 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x140/0x180 net/socket.c:727 ____sys_sendmsg+0x350/0x4e0 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x1a0/0x240 net/socket.c:2652 __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __x64_sys_sendmsg+0x46/0x50 net/socket.c:2655 x64_sys_call+0x26f3/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000001111 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 8509 Comm: syz.4.1792 Not tainted 6.14.0-syzkaller-13389-ga52a3c18cdf3 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 ==================================================================