syzbot

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BUG: KCSAN: data-race in __delete_from_swap_cache / folio_mapping

write to 0xffffea00047066a8 of 8 bytes by task 3938 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_file_read_iter+0x102/0x540 mm/shmem.c:3350
 lo_rw_aio+0x605/0x7f0 drivers/block/loop.c:-1
 do_req_filebacked drivers/block/loop.c:424 [inline]
 loop_handle_cmd drivers/block/loop.c:1866 [inline]
 loop_process_work+0x553/0xac0 drivers/block/loop.c:1901
 loop_workfn+0x31/0x40 drivers/block/loop.c:1925
 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 0xffffea00047066a8 of 8 bytes by task 9920 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+0x3ab/0x890 mm/memcontrol.c:2304
 obj_cgroup_charge_pages+0xc0/0x1a0 mm/memcontrol.c:2695
 __memcg_kmem_charge_page+0x9d/0x170 mm/memcontrol.c:2739
 __alloc_frozen_pages_noprof+0x1a6/0x360 mm/page_alloc.c:4987
 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:5048
 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+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000001461 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 9920 Comm: syz.5.2152 Not tainted 6.15.0-rc3-syzkaller-00008-ga33b5a08cbbd #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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syz.5.2152 (9920) used greatest stack depth: 6120 bytes left