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BUG: KCSAN: data-race in __delete_from_page_cache / nr_blockdev_pages

write to 0xffff88821b8549e8 of 8 bytes by task 7921 on cpu 0:
 page_cache_delete mm/filemap.c:153 [inline]
 __delete_from_page_cache+0x1d8/0x4a0 mm/filemap.c:238
 __remove_mapping+0x2db/0x530 mm/vmscan.c:939
 shrink_page_list+0xf57/0x2710 mm/vmscan.c:1439
 shrink_inactive_list+0x3d1/0x920 mm/vmscan.c:1959
 shrink_list mm/vmscan.c:2178 [inline]
 shrink_lruvec+0x4c8/0xd20 mm/vmscan.c:2496
 shrink_node_memcgs mm/vmscan.c:2685 [inline]
 shrink_node+0x2fe/0xfe0 mm/vmscan.c:2791
 shrink_zones mm/vmscan.c:2996 [inline]
 do_try_to_free_pages+0x245/0xb60 mm/vmscan.c:3049
 try_to_free_mem_cgroup_pages+0x205/0x4d0 mm/vmscan.c:3371
 reclaim_high.constprop.0+0xf7/0x140 mm/memcontrol.c:2232
 mem_cgroup_handle_over_high+0x96/0x180 mm/memcontrol.c:2313
 tracehook_notify_resume include/linux/tracehook.h:197 [inline]
 exit_to_usermode_loop+0x20c/0x2c0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode+0x1a6/0x1d0 arch/x86/entry/common.c:195
 swapgs_restore_regs_and_return_to_usermode+0x0/0x40

read to 0xffff88821b8549e8 of 8 bytes by task 26 on cpu 1:
 nr_blockdev_pages+0x73/0xc0 fs/block_dev.c:952
 si_meminfo+0x3e/0x60 mm/page_alloc.c:5151
 update_defense_level+0x40/0xb50 net/netfilter/ipvs/ip_vs_ctl.c:101
 defense_work_handler+0x3d/0xd0 net/netfilter/ipvs/ip_vs_ctl.c:224
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events defense_work_handler
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