syzbot

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BUG: KCSAN: data-race in delete_from_page_cache_batch / nr_blockdev_pages

read-write to 0xffff888102419d08 of 8 bytes by task 28948 on cpu 0:
 page_cache_delete_batch mm/filemap.c:315 [inline]
 delete_from_page_cache_batch+0x52d/0x770 mm/filemap.c:334
 truncate_inode_pages_range+0x355/0x830 mm/truncate.c:369
 __jbd2_journal_erase fs/jbd2/journal.c:1827 [inline]
 jbd2_journal_flush+0x51b/0x800 fs/jbd2/journal.c:2492
 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1082 [inline]
 __ext4_ioctl fs/ext4/ioctl.c:1590 [inline]
 ext4_ioctl+0x1edf/0x2cd0 fs/ext4/ioctl.c:1610
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:856
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888102419d08 of 8 bytes by task 23474 on cpu 1:
 nr_blockdev_pages+0x7f/0xd0 block/bdev.c:523
 si_meminfo+0x3a/0x60 mm/page_alloc.c:5975
 update_defense_level+0x46/0x560 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x1a/0x80 net/netfilter/ipvs/ip_vs_ctl.c:235
 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289
 worker_thread+0x618/0xa70 kernel/workqueue.c:2436
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

value changed: 0x00000000000011ec -> 0x00000000000011dd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23474 Comm: kworker/1:0 Tainted: G        W          6.2.0-rc4-syzkaller-00041-gc1649ec55708-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
Workqueue: events_long defense_work_handler
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