==================================================================
BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_remove

read to 0xffff8881231fe708 of 200 bytes by task 10133 on cpu 0:
 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

write to 0xffff8881231fe778 of 8 bytes by task 10137 on cpu 1:
 vma_interval_tree_augment_compute_max mm/interval_tree.c:23 [inline]
 vma_interval_tree_augment_propagate mm/interval_tree.c:23 [inline]
 __rb_erase_augmented include/linux/rbtree_augmented.h:295 [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+0x491/0x8b0 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+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: 1 PID: 10137 Comm: modprobe Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================