syzbot

==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / nr_blockdev_pages

read-write to 0xffff888100631e70 of 8 bytes by task 4727 on cpu 0:
 __filemap_add_folio+0x439/0x710 mm/filemap.c:918
 filemap_add_folio+0x9c/0x1b0 mm/filemap.c:970
 do_read_cache_folio+0xd9/0x5c0 mm/filemap.c:3756
 read_cache_folio+0x3a/0x50 mm/filemap.c:3821
 read_mapping_folio include/linux/pagemap.h:913 [inline]
 read_part_sector+0x6e/0x130 block/partitions/core.c:712
 read_lba block/partitions/efi.c:248 [inline]
 alloc_read_gpt_entries+0x15c/0x280 block/partitions/efi.c:288
 is_gpt_valid+0x4eb/0x590 block/partitions/efi.c:430
 find_valid_gpt block/partitions/efi.c:615 [inline]
 efi_partition+0x12b/0x1250 block/partitions/efi.c:720
 check_partition block/partitions/core.c:138 [inline]
 blk_add_partitions block/partitions/core.c:579 [inline]
 bdev_disk_changed+0x454/0xbb0 block/partitions/core.c:683
 loop_reread_partitions drivers/block/loop.c:534 [inline]
 loop_set_status+0x4ab/0x550 drivers/block/loop.c:1303
 lo_ioctl+0x7fd/0x11d0
 blkdev_ioctl+0x35f/0x450 block/ioctl.c:676
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x15cc/0x2d60 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 0xffff888100631e70 of 8 bytes by task 4489 on cpu 1:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:475
 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:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x526/0x6e0 kernel/workqueue.c:3389
 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: 0x00000000000000d5 -> 0x00000000000000d6

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4489 Comm: kworker/1:9 Not tainted 6.11.0-rc5-syzkaller-00219-g1934261d8974 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events_long defense_work_handler
==================================================================