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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert

write to 0xffff8881243b2da8 of 8 bytes by task 8202 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:634
 vma_link+0xab/0x130 mm/mmap.c:660
 mmap_region+0x85e/0xd50 mm/mmap.c:1807
 do_mmap+0x6c8/0xba0 mm/mmap.c:1555
 do_mmap_pgoff include/linux/mm.h:2338 [inline]
 vm_mmap_pgoff+0x12d/0x190 mm/util.c:506
 vm_mmap+0x9d/0xd0 mm/util.c:525
 elf_map+0xd4/0x200 fs/binfmt_elf.c:377
 load_elf_interp fs/binfmt_elf.c:600 [inline]
 load_elf_binary+0x1566/0x2f10 fs/binfmt_elf.c:1056
 search_binary_handler fs/exec.c:1658 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1635
 exec_binprm fs/exec.c:1701 [inline]
 __do_execve_file.isra.0+0xb6a/0x1140 fs/exec.c:1821
 do_execveat_common fs/exec.c:1867 [inline]
 do_execve+0x3c/0x60 fs/exec.c:1884
 call_usermodehelper_exec_async+0x3b0/0x400 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff8881243b2d48 of 200 bytes by task 8204 on cpu 0:
 vm_area_dup+0x70/0xf0 kernel/fork.c:362
 __split_vma+0x88/0x350 mm/mmap.c:2656
 split_vma+0x73/0xa0 mm/mmap.c:2714
 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/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 8204 Comm: modprobe Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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