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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert

write to 0xffff888129314778 of 8 bytes by task 9036 on cpu 1:
 vma_interval_tree_insert+0xdf/0x230 mm/interval_tree.c:23
 __vma_link_file+0xd9/0x110 mm/mmap.c:634
 vma_link+0xae/0x130 mm/mmap.c:660
 mmap_region+0x8bb/0xd50 mm/mmap.c:1829
 do_mmap+0x6d4/0xba0 mm/mmap.c:1577
 do_mmap_pgoff include/linux/mm.h:2353 [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+0x91/0xc0 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

read to 0xffff888129314708 of 200 bytes by task 9038 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+0x43f/0x510 mm/mprotect.c:413
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9038 Comm: blkid Not tainted 5.4.0-rc6+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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