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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert_after

write to 0xffff8881214b4b58 of 8 bytes by task 7971 on cpu 1:
 rb_link_node include/linux/rbtree.h:75 [inline]
 vma_interval_tree_insert_after+0x135/0x170 mm/interval_tree.c:56
 dup_mmap kernel/fork.c:576 [inline]
 dup_mm+0x53e/0xba0 kernel/fork.c:1360
 copy_mm kernel/fork.c:1416 [inline]
 copy_process+0x39d7/0x3b40 kernel/fork.c:2081
 _do_fork+0xfe/0x7a0 kernel/fork.c:2430
 __do_sys_clone kernel/fork.c:2585 [inline]
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2566
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881214b4af0 of 200 bytes by task 7970 on cpu 0:
 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+0x39d7/0x3b40 kernel/fork.c:2081
 _do_fork+0xfe/0x7a0 kernel/fork.c:2430
 __do_sys_clone kernel/fork.c:2585 [inline]
 __se_sys_clone kernel/fork.c:2566 [inline]
 __x64_sys_clone+0x130/0x170 kernel/fork.c:2566
 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: 7970 Comm: udevd Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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