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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert

write to 0xffff888123ed3f38 of 8 bytes by task 7670 on cpu 1:
 rb_link_node include/linux/rbtree.h:75 [inline]
 vma_interval_tree_insert+0x164/0x230 mm/interval_tree.c:23
 __vma_link_file+0xd9/0x110 mm/mmap.c:625
 __vma_adjust+0x1b2/0xf20 mm/mmap.c:833
 vma_adjust include/linux/mm.h:2299 [inline]
 __split_vma+0x208/0x350 mm/mmap.c:2692
 split_vma+0x73/0xa0 mm/mmap.c:2721
 mprotect_fixup+0x51f/0x600 mm/mprotect.c:419
 do_mprotect_pkey+0x3eb/0x660 mm/mprotect.c:557
 __do_sys_mprotect mm/mprotect.c:582 [inline]
 __se_sys_mprotect mm/mprotect.c:579 [inline]
 __x64_sys_mprotect+0x51/0x70 mm/mprotect.c:579
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888123ed3ed8 of 200 bytes by task 7671 on cpu 0:
 vm_area_dup+0x70/0xf0 kernel/fork.c:350
 __split_vma+0x88/0x350 mm/mmap.c:2663
 __do_munmap+0x9d0/0xa30 mm/mmap.c:2788
 do_munmap mm/mmap.c:2841 [inline]
 mmap_region+0x165/0xd50 mm/mmap.c:1731
 do_mmap+0x6b0/0xb20 mm/mmap.c:1561
 do_mmap_pgoff include/linux/mm.h:2374 [inline]
 vm_mmap_pgoff+0x12d/0x190 mm/util.c:391
 ksys_mmap_pgoff+0x2d8/0x420 mm/mmap.c:1611
 __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+0x91/0xc0 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7671 Comm: blkid Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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