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BUG: KCSAN: data-race in __rb_erase_color / vm_area_dup

write to 0xffff88812493ba80 of 8 bytes by task 28896 on cpu 1:
 rb_set_black lib/rbtree.c:61 [inline]
 ____rb_erase_color lib/rbtree.c:373 [inline]
 __rb_erase_color+0x51c/0x700 lib/rbtree.c:413
 rb_erase_augmented include/linux/rbtree_augmented.h:305 [inline]
 rb_erase_augmented_cached include/linux/rbtree_augmented.h:314 [inline]
 vma_interval_tree_remove+0x4dd/0x8b0 mm/interval_tree.c:23
 __remove_shared_vm_struct+0xad/0xd0 mm/mmap.c:154
 unlink_file_vma+0x69/0x90 mm/mmap.c:169
 free_pgtables+0xbe/0x200 mm/memory.c:400
 unmap_region+0x21c/0x270 mm/mmap.c:2604
 __do_munmap+0x661/0xb60 mm/mmap.c:2823
 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+0x99/0x420 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

read to 0xffff88812493ba28 of 200 bytes by task 28898 on cpu 0:
 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

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28898 Comm: modprobe 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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