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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_remove

write to 0xffff88811f83e5d0 of 8 bytes by task 17873 on cpu 1:
 __rb_erase_augmented include/linux/rbtree_augmented.h:218 [inline]
 rb_erase_augmented include/linux/rbtree_augmented.h:303 [inline]
 rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline]
 vma_interval_tree_remove+0x6ae/0x8e0 mm/interval_tree.c:23
 __remove_shared_vm_struct+0xa4/0xc0 mm/mmap.c:151
 unlink_file_vma+0x65/0x80 mm/mmap.c:166
 free_pgtables+0xb8/0x1f0 mm/memory.c:400
 exit_mmap+0x14d/0x2f0 mm/mmap.c:3151
 __mmput kernel/fork.c:1085 [inline]
 mmput+0xe2/0x260 kernel/fork.c:1106
 exit_mm kernel/exit.c:479 [inline]
 do_exit+0x644/0x11e0 kernel/exit.c:782
 do_group_exit+0xae/0x1a0 kernel/exit.c:893
 __do_sys_exit_group kernel/exit.c:904 [inline]
 __se_sys_exit_group kernel/exit.c:902 [inline]
 __x64_sys_exit_group+0x2b/0x30 kernel/exit.c:902
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88811f83e578 of 200 bytes by task 17875 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+0x404/0x530 mm/mprotect.c:467
 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: 17875 Comm: modprobe 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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