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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_remove

write to 0xffff888123e585e8 of 8 bytes by task 12011 on cpu 0:
 vma_interval_tree_augment_copy mm/interval_tree.c:23 [inline]
 __rb_erase_augmented include/linux/rbtree_augmented.h:247 [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+0x58b/0x8b0 mm/interval_tree.c:23
 __vma_adjust+0x278/0x11d0 mm/mmap.c:835
 vma_adjust include/linux/mm.h:2261 [inline]
 __split_vma+0x208/0x350 mm/mmap.c:2685
 split_vma+0x73/0xa0 mm/mmap.c:2714
 mprotect_fixup+0x43f/0x510 mm/mprotect.c:413
 do_mprotect_pkey+0x3eb/0x660 mm/mprotect.c:553
 __do_sys_mprotect mm/mprotect.c:578 [inline]
 __se_sys_mprotect mm/mprotect.c:575 [inline]
 __x64_sys_mprotect+0x51/0x70 mm/mprotect.c:575
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888123e58578 of 200 bytes by task 12010 on cpu 1:
 vm_area_dup+0x70/0xf0 kernel/fork.c:362
 __split_vma+0x88/0x350 mm/mmap.c:2656
 split_vma+0x73/0xa0 mm/mmap.c:2714
 mprotect_fixup+0x43f/0x510 mm/mprotect.c:413
 do_mprotect_pkey+0x3eb/0x660 mm/mprotect.c:553
 __do_sys_mprotect mm/mprotect.c:578 [inline]
 __se_sys_mprotect mm/mprotect.c:575 [inline]
 __x64_sys_mprotect+0x51/0x70 mm/mprotect.c:575
 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: 12010 Comm: blkid 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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