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BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff8881006311f0 of 8 bytes by task 16506 on cpu 0:
 __filemap_add_folio+0x430/0x6f0 mm/filemap.c:919
 filemap_add_folio+0x9c/0x1b0 mm/filemap.c:971
 do_read_cache_folio+0xd5/0x5b0 mm/filemap.c:3793
 read_cache_folio+0x3a/0x50 mm/filemap.c:3858
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 read_part_sector+0x6e/0x130 block/partitions/core.c:722
 read_lba block/partitions/efi.c:248 [inline]
 find_valid_gpt block/partitions/efi.c:603 [inline]
 efi_partition+0x1e6/0x1250 block/partitions/efi.c:720
 check_partition block/partitions/core.c:141 [inline]
 blk_add_partitions block/partitions/core.c:589 [inline]
 bdev_disk_changed+0x45f/0xb90 block/partitions/core.c:693
 loop_reread_partitions drivers/block/loop.c:534 [inline]
 loop_set_status+0x4a5/0x540 drivers/block/loop.c:1302
 lo_ioctl+0x7f1/0x11c0
 blkdev_ioctl+0x359/0x450 block/ioctl.c:693
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:906 [inline]
 __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:892
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:892
 x64_sys_call+0x1690/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881006311f0 of 8 bytes by task 7817 on cpu 1:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:482
 si_meminfo+0x87/0xd0 mm/show_mem.c:80
 update_defense_level+0x49/0x5b0 net/netfilter/ipvs/ip_vs_ctl.c:102
 defense_work_handler+0x1f/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3310
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3391
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7817 Comm: kworker/1:9 Not tainted 6.13.0-rc1-syzkaller-00378-g62b5a46999c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events_long defense_work_handler
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