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BUG: KCSAN: data-race in __rb_rotate_set_parents / vm_area_dup

write to 0xffff88812334c698 of 8 bytes by task 8214 on cpu 0:
 rb_set_parent_color include/linux/rbtree_augmented.h:165 [inline]
 __rb_rotate_set_parents+0x5c/0xf0 lib/rbtree.c:80
 __rb_insert lib/rbtree.c:215 [inline]
 __rb_insert_augmented+0x109/0x370 lib/rbtree.c:459
 rb_insert_augmented include/linux/rbtree_augmented.h:50 [inline]
 vma_interval_tree_insert_after+0x14b/0x170 mm/interval_tree.c:57
 dup_mmap kernel/fork.c:576 [inline]
 dup_mm+0x53e/0xba0 kernel/fork.c:1360
 copy_mm kernel/fork.c:1416 [inline]
 copy_process+0x3539/0x3cd0 kernel/fork.c:2072
 _do_fork+0xfe/0x7a0 kernel/fork.c:2421
 __do_sys_clone kernel/fork.c:2576 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2557
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812334c640 of 200 bytes by task 8196 on cpu 1:
 vm_area_dup+0x70/0xf0 kernel/fork.c:362
 dup_mmap kernel/fork.c:544 [inline]
 dup_mm+0x330/0xba0 kernel/fork.c:1360
 copy_mm kernel/fork.c:1416 [inline]
 copy_process+0x3539/0x3cd0 kernel/fork.c:2072
 _do_fork+0xfe/0x7a0 kernel/fork.c:2421
 __do_sys_clone kernel/fork.c:2576 [inline]
 __se_sys_clone kernel/fork.c:2557 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2557
 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: 1 PID: 8196 Comm: udevd 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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