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BUG: KCSAN: data-race in __rb_erase_color / vm_area_dup

read to 0xffff888124112320 of 200 bytes by task 15495 on cpu 0:
 vm_area_dup+0x70/0xf0 kernel/fork.c:359
 __split_vma+0x88/0x350 mm/mmap.c:2678
 split_vma+0x73/0xa0 mm/mmap.c:2736
 mprotect_fixup+0x3e8/0x510 mm/mprotect.c:407
 do_mprotect_pkey+0x3eb/0x660 mm/mprotect.c:553
 __do_sys_mprotect mm/mprotect.c:578 [inline]
 __se_sys_mprotect mm/mprotect.c:575 [inline]
 __x64_sys_mprotect+0x51/0x70 mm/mprotect.c:575
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888124112378 of 8 bytes by task 15497 on cpu 1:
 __rb_rotate_set_parents lib/rbtree.c:79 [inline]
 ____rb_erase_color lib/rbtree.c:401 [inline]
 __rb_erase_color+0x2b6/0x700 lib/rbtree.c:413
 rb_erase_augmented include/linux/rbtree_augmented.h:307 [inline]
 rb_erase_augmented_cached include/linux/rbtree_augmented.h:316 [inline]
 vma_interval_tree_remove+0x4e8/0x8a0 mm/interval_tree.c:23
 __remove_shared_vm_struct+0xad/0xd0 mm/mmap.c:154
 unlink_file_vma+0x69/0x90 mm/mmap.c:169
 free_pgtables+0xbe/0x200 mm/memory.c:382
 unmap_region+0x21c/0x270 mm/mmap.c:2626
 __do_munmap+0x661/0xb60 mm/mmap.c:2845
 do_munmap mm/mmap.c:2856 [inline]
 mmap_region+0x165/0xd50 mm/mmap.c:1749
 do_mmap+0x6d4/0xba0 mm/mmap.c:1577
 do_mmap_pgoff include/linux/mm.h:2348 [inline]
 vm_mmap_pgoff+0x12d/0x190 mm/util.c:496
 ksys_mmap_pgoff+0x2d8/0x420 mm/mmap.c:1629
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x2e/0x40 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15497 Comm: blkid Not tainted 5.4.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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