syzbot

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BUG: KCSAN: data-race in kvm_mmu_notifier_invalidate_range_end / kvm_mmu_notifier_invalidate_range_start

write to 0xffffc90000ec6078 of 8 bytes by task 29077 on cpu 0:
 kvm_mmu_notifier_invalidate_range_start+0x67/0x300 arch/x86/kvm/../../../virt/kvm/kvm_main.c:488
 mn_hlist_invalidate_range_start mm/mmu_notifier.c:493 [inline]
 __mmu_notifier_invalidate_range_start+0x24a/0x440 mm/mmu_notifier.c:548
 mmu_notifier_invalidate_range_start include/linux/mmu_notifier.h:453 [inline]
 try_to_unmap_one+0x3b7/0x1770 mm/rmap.c:1440
 rmap_walk_anon+0x26b/0x5a0 mm/rmap.c:1882
 try_to_unmap+0x230/0x310 mm/rmap.c:1963
 __unmap_and_move+0x376/0x6a0 mm/migrate.c:1128
 unmap_and_move+0x131/0x690 mm/migrate.c:1200
 migrate_pages+0x2f7/0xfb0 mm/migrate.c:1472
 do_mbind+0xe47/0x1030 mm/mempolicy.c:1357
 kernel_mbind mm/mempolicy.c:1478 [inline]
 __do_sys_mbind mm/mempolicy.c:1485 [inline]
 __se_sys_mbind mm/mempolicy.c:1481 [inline]
 __x64_sys_mbind+0x142/0x170 mm/mempolicy.c:1481
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffc90000ec6078 of 8 bytes by task 29043 on cpu 1:
 kvm_mmu_notifier_invalidate_range_end+0x6c/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:540
 mn_hlist_invalidate_end mm/mmu_notifier.c:583 [inline]
 __mmu_notifier_invalidate_range_end+0x18e/0x210 mm/mmu_notifier.c:603
 mmu_notifier_invalidate_range_end include/linux/mmu_notifier.h:479 [inline]
 try_to_unmap_one+0x12e4/0x1770 mm/rmap.c:1729
 rmap_walk_file+0x260/0x4f0 mm/rmap.c:1936
 rmap_walk mm/rmap.c:1954 [inline]
 try_to_munlock+0xe7/0x150 mm/rmap.c:1805
 __munlock_isolated_page mm/mlock.c:121 [inline]
 __munlock_pagevec+0x9ad/0xc60 mm/mlock.c:321
 munlock_vma_pages_range+0x5a6/0x780 mm/mlock.c:474
 munlock_vma_pages_all mm/internal.h:362 [inline]
 exit_mmap+0x128/0x400 mm/mmap.c:3202
 __mmput+0xa2/0x220 kernel/fork.c:1090
 mmput+0x3d/0x50 kernel/fork.c:1111
 exit_mm+0x344/0x430 kernel/exit.c:501
 do_exit+0x3fc/0x15e0 kernel/exit.c:812
 do_group_exit+0x17d/0x180 kernel/exit.c:922
 __do_sys_exit_group+0xb/0x10 kernel/exit.c:933
 __se_sys_exit_group+0x5/0x10 kernel/exit.c:931
 __x64_sys_exit_group+0x16/0x20 kernel/exit.c:931
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29043 Comm: syz-executor.1 Tainted: G        W         5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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