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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert

write to 0xffff8881266522b8 of 8 bytes by task 7409 on cpu 0:
 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: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
 vm_mmap+0x9d/0xd0 mm/util.c:515
 test_bit include/asm-generic/bitops-instrumented.h:255 [inline]
 test_ti_thread_flag include/linux/thread_info.h:84 [inline]
 elf_map+0x16f/0x200 fs/binfmt_elf.c:374
 load_elf_interp fs/binfmt_elf.c:590 [inline]
 load_elf_binary+0x1570/0x2ec0 fs/binfmt_elf.c:1059
 search_binary_handler fs/exec.c:1659 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1636
 exec_binprm fs/exec.c:1702 [inline]
 __do_execve_file.isra.0+0xb76/0x11d0 fs/exec.c:1822
 do_execveat_common fs/exec.c:1868 [inline]
 do_execve fs/exec.c:1885 [inline]
 __do_sys_execve fs/exec.c:1961 [inline]
 __se_sys_execve fs/exec.c:1956 [inline]
 __x64_sys_execve+0x62/0x80 fs/exec.c:1956
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888126652258 of 200 bytes by task 7408 on cpu 1:
 vm_area_dup+0x70/0xf0 kernel/fork.c:359
 __split_vma+0x88/0x350 mm/mmap.c:2678
 __do_munmap+0x233/0xb60 mm/mmap.c:2794
 __vm_munmap+0xb2/0x130 mm/mmap.c:2868
 vm_munmap+0x29/0x40 mm/mmap.c:2886
 elf_map+0x1f6/0x200 fs/binfmt_elf.c:379
 load_elf_interp fs/binfmt_elf.c:590 [inline]
 load_elf_binary+0x1570/0x2ec0 fs/binfmt_elf.c:1059
 search_binary_handler fs/exec.c:1659 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1636
 exec_binprm fs/exec.c:1702 [inline]
 __do_execve_file.isra.0+0xb76/0x11d0 fs/exec.c:1822
 do_execveat_common fs/exec.c:1868 [inline]
 do_execve fs/exec.c:1885 [inline]
 __do_sys_execve fs/exec.c:1961 [inline]
 __se_sys_execve fs/exec.c:1956 [inline]
 __x64_sys_execve+0x62/0x80 fs/exec.c:1956
 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: 7408 Comm: ps Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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