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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881005b24b0 of 8 bytes by task 3531 on cpu 0:
 __filemap_add_folio+0x3c3/0x750 mm/filemap.c:904
 filemap_add_folio+0x70/0x160 mm/filemap.c:939
 do_read_cache_folio+0xcc/0x450 mm/filemap.c:3709
 read_cache_folio+0x3a/0x50 mm/filemap.c:3774
 read_mapping_folio include/linux/pagemap.h:866 [inline]
 read_part_sector+0x7b/0x140 block/partitions/core.c:714
 read_lba block/partitions/efi.c:248 [inline]
 alloc_read_gpt_header block/partitions/efi.c:316 [inline]
 is_gpt_valid+0x1c7/0x640 block/partitions/efi.c:343
 find_valid_gpt block/partitions/efi.c:618 [inline]
 efi_partition+0x1db/0x1270 block/partitions/efi.c:720
 check_partition block/partitions/core.c:138 [inline]
 blk_add_partitions block/partitions/core.c:596 [inline]
 bdev_disk_changed+0x3fa/0xbd0 block/partitions/core.c:685
 loop_reread_partitions drivers/block/loop.c:518 [inline]
 loop_set_status+0x4ab/0x550 drivers/block/loop.c:1322
 lo_ioctl+0x892/0x12e0
 blkdev_ioctl+0x375/0x460 block/ioctl.c:630
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff8881005b24b0 of 8 bytes by task 3182 on cpu 1:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:441
 si_meminfo+0x87/0xd0 mm/show_mem.c:83
 update_defense_level+0x46/0x600 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703
 worker_thread+0x525/0x730 kernel/workqueue.c:2784
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

value changed: 0x0000000000000005 -> 0x0000000000000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3182 Comm: kworker/1:3 Not tainted 6.6.0-rc3-syzkaller-00146-g9f3ebbef746f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events_long defense_work_handler
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