==================================================================
BUG: KCSAN: data-race in __rb_rotate_set_parents / vm_area_dup

write to 0xffff888124df7508 of 8 bytes by task 7533 on cpu 1:
 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:573 [inline]
 dup_mm+0x53e/0xba0 kernel/fork.c:1361
 copy_mm kernel/fork.c:1417 [inline]
 copy_process+0x36f3/0x3b50 kernel/fork.c:2012
 _do_fork+0xfe/0x6e0 kernel/fork.c:2366
 __do_sys_clone kernel/fork.c:2521 [inline]
 __se_sys_clone kernel/fork.c:2502 [inline]
 __x64_sys_clone+0x12b/0x160 kernel/fork.c:2502
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888124df74b0 of 200 bytes by task 7534 on cpu 0:
 vm_area_dup+0x70/0xf0 kernel/fork.c:359
 dup_mmap kernel/fork.c:541 [inline]
 dup_mm+0x330/0xba0 kernel/fork.c:1361
 copy_mm kernel/fork.c:1417 [inline]
 copy_process+0x36f3/0x3b50 kernel/fork.c:2012
 _do_fork+0xfe/0x6e0 kernel/fork.c:2366
 __do_sys_clone kernel/fork.c:2521 [inline]
 __se_sys_clone kernel/fork.c:2502 [inline]
 __x64_sys_clone+0x12b/0x160 kernel/fork.c:2502
 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: 7534 Comm: net.agent Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================