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BUG: KCSAN: data-race in kvm_mmu_notifier_invalidate_range_end / kvm_mmu_notifier_invalidate_range_end

write to 0xffffc90003a7e190 of 8 bytes by task 31862 on cpu 0:
 kvm_mmu_notifier_invalidate_range_end+0x58/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:516
 mn_hlist_invalidate_end mm/mmu_notifier.c:560 [inline]
 __mmu_notifier_invalidate_range_end+0x18e/0x210 mm/mmu_notifier.c:580
 mmu_notifier_invalidate_range_end include/linux/mmu_notifier.h:479 [inline]
 try_to_unmap_one+0x144b/0x1880 mm/rmap.c:1721
 rmap_walk_file+0x260/0x4f0 mm/rmap.c:1933
 try_to_unmap+0x207/0x310 mm/rmap.c:1962
 shrink_page_list+0xdba/0x23c0 mm/vmscan.c:1304
 reclaim_pages+0x40e/0x540 mm/vmscan.c:2143
 madvise_cold_or_pageout_pte_range+0x13e5/0x1670 include/linux/spinlock.h:394
 walk_pmd_range mm/pagewalk.c:89 [inline]
 walk_pud_range mm/pagewalk.c:160 [inline]
 walk_p4d_range mm/pagewalk.c:193 [inline]
 walk_pgd_range mm/pagewalk.c:229 [inline]
 __walk_page_range+0xa66/0x15a0 mm/pagewalk.c:331
 walk_page_range+0x111/0x2e0 mm/pagewalk.c:427
 madvise_pageout_page_range mm/madvise.c:521 [inline]
 madvise_pageout mm/madvise.c:557 [inline]
 madvise_vma mm/madvise.c:946 [inline]
 do_madvise+0xc6e/0x14f0 mm/madvise.c:1145
 __do_sys_madvise mm/madvise.c:1171 [inline]
 __se_sys_madvise mm/madvise.c:1169 [inline]
 __x64_sys_madvise+0x3e/0x50 mm/madvise.c:1169
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffc90003a7e190 of 8 bytes by task 3442 on cpu 1:
 kvm_mmu_notifier_invalidate_range_end+0x6c/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:519
 mn_hlist_invalidate_end mm/mmu_notifier.c:560 [inline]
 __mmu_notifier_invalidate_range_end+0x18e/0x210 mm/mmu_notifier.c:580
 mmu_notifier_invalidate_range_end include/linux/mmu_notifier.h:479 [inline]
 page_mkclean_one+0x30e/0x360 mm/rmap.c:966
 rmap_walk_file+0x260/0x4f0 mm/rmap.c:1933
 rmap_walk mm/rmap.c:1951 [inline]
 page_mkclean+0x17a/0x210 mm/rmap.c:998
 clear_page_dirty_for_io+0xd1/0x430 mm/page-writeback.c:2698
 mpage_submit_page fs/ext4/inode.c:2061 [inline]
 mpage_process_page_bufs+0x41e/0x600 fs/ext4/inode.c:2195
 mpage_prepare_extent_to_map+0x4ec/0x650 fs/ext4/inode.c:2607
 ext4_writepages+0x682/0x1ef0 fs/ext4/inode.c:2735
 do_writepages+0x7b/0x150 mm/page-writeback.c:2352
 __writeback_single_inode+0x84/0x600 fs/fs-writeback.c:1461
 writeback_sb_inodes+0x6c0/0xff0 fs/fs-writeback.c:1721
 __writeback_inodes_wb+0xb0/0x2b0 fs/fs-writeback.c:1790
 wb_writeback+0x2b0/0x6f0 fs/fs-writeback.c:1896
 wb_check_old_data_flush fs/fs-writeback.c:1998 [inline]
 wb_do_writeback+0x54a/0x5f0 fs/fs-writeback.c:2051
 wb_workfn+0xc8/0x470 fs/fs-writeback.c:2080
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3442 Comm: kworker/u4:4 Not tainted 5.9.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
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