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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert_after

write to 0xffff888097193ce8 of 8 bytes by task 32672 on cpu 1:
 rb_link_node include/linux/rbtree.h:75 [inline]
 vma_interval_tree_insert_after+0x169/0x1b0 mm/interval_tree.c:56
 dup_mmap kernel/fork.c:579 [inline]
 dup_mm+0x4df/0xb50 kernel/fork.c:1363
 copy_mm kernel/fork.c:1419 [inline]
 copy_process+0x394f/0x3ab0 kernel/fork.c:2085
 _do_fork+0xf7/0x790 kernel/fork.c:2430
 __do_sys_clone+0xf9/0x130 kernel/fork.c:2585
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x6c/0x80 kernel/fork.c:2566
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888097193c80 of 200 bytes by task 32674 on cpu 0:
 vm_area_dup+0x71/0x110 kernel/fork.c:362
 __split_vma+0x83/0x340 mm/mmap.c:2666
 split_vma+0x69/0x90 mm/mmap.c:2724
 mprotect_fixup+0x45d/0x530 mm/mprotect.c:473
 do_mprotect_pkey+0x3da/0x640 mm/mprotect.c:613
 __do_sys_mprotect mm/mprotect.c:638 [inline]
 __se_sys_mprotect mm/mprotect.c:635 [inline]
 __x64_sys_mprotect+0x4d/0x60 mm/mprotect.c:635
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 32674 Comm: ifupdown-hotplu Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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