syzbot

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BUG: KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages

read-write to 0xffff888100630bb0 of 8 bytes by task 9571 on cpu 1:
 page_cache_delete_batch mm/filemap.c:314 [inline]
 delete_from_page_cache_batch+0x513/0x710 mm/filemap.c:333
 truncate_inode_pages_range+0x1bd/0x6a0 mm/truncate.c:368
 truncate_inode_pages+0x24/0x30 mm/truncate.c:448
 kill_bdev block/bdev.c:76 [inline]
 blkdev_flush_mapping+0xc0/0x1c0 block/bdev.c:632
 blkdev_put_whole block/bdev.c:663 [inline]
 blkdev_put+0x33a/0x470 block/bdev.c:944
 bdev_release+0x2f/0x40 block/bdev.c:954
 blkdev_release+0x25/0x30 block/fops.c:616
 __fput+0x299/0x630 fs/file_table.c:394
 __fput_sync+0x44/0x50 fs/file_table.c:475
 __do_sys_close fs/open.c:1590 [inline]
 __se_sys_close+0xfa/0x1a0 fs/open.c:1575
 __x64_sys_close+0x1f/0x30 fs/open.c:1575
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888100630bb0 of 8 bytes by task 18588 on cpu 0:
 nr_blockdev_pages+0x7c/0xd0 block/bdev.c:443
 si_meminfo+0x87/0xd0 mm/show_mem.c:80
 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:2627 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2700
 worker_thread+0x525/0x730 kernel/workqueue.c:2781
 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:242

value changed: 0x0000000000000045 -> 0x0000000000000036

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18588 Comm: kworker/0:2 Not tainted 6.7.0-rc4-syzkaller-00039-g9ace34a8e446 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events_long defense_work_handler
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