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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_remove

read to 0xffff8881266467d0 of 200 bytes by task 17306 on cpu 1:
 vm_area_dup+0x70/0xf0 kernel/fork.c:362
 __split_vma+0x88/0x350 mm/mmap.c:2656
 __do_munmap+0xb02/0xb60 mm/mmap.c:2781
 do_munmap mm/mmap.c:2834 [inline]
 mmap_region+0x165/0xd50 mm/mmap.c:1727
 do_mmap+0x6c8/0xba0 mm/mmap.c:1555
 do_mmap_pgoff include/linux/mm.h:2338 [inline]
 vm_mmap_pgoff+0x12d/0x190 mm/util.c:506
 ksys_mmap_pgoff+0x2d8/0x420 mm/mmap.c:1607
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x2e/0x40 arch/x86/kernel/sys_x86_64.c:91
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888126646828 of 8 bytes by task 17304 on cpu 0:
 rb_set_parent include/linux/rbtree_augmented.h:159 [inline]
 __rb_erase_augmented include/linux/rbtree_augmented.h:279 [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+0x316/0x8b0 mm/interval_tree.c:23
 __vma_adjust+0x278/0x11d0 mm/mmap.c:835
 vma_adjust include/linux/mm.h:2261 [inline]
 __split_vma+0x338/0x350 mm/mmap.c:2682
 __do_munmap+0xb02/0xb60 mm/mmap.c:2781
 do_munmap mm/mmap.c:2834 [inline]
 mmap_region+0x165/0xd50 mm/mmap.c:1727
 do_mmap+0x6c8/0xba0 mm/mmap.c:1555
 do_mmap_pgoff include/linux/mm.h:2338 [inline]
 vm_mmap_pgoff+0x12d/0x190 mm/util.c:506
 ksys_mmap_pgoff+0x2d8/0x420 mm/mmap.c:1607
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline]
 __x64_sys_mmap+0x2e/0x40 arch/x86/kernel/sys_x86_64.c:91
 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: 17304 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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