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BUG: KCSAN: data-race in vm_area_dup / vma_interval_tree_insert

write to 0xffff888123385448 of 8 bytes by task 16299 on cpu 1:
 rb_link_node include/linux/rbtree.h:75 [inline]
 vma_interval_tree_insert+0x164/0x230 mm/interval_tree.c:23
 __vma_adjust+0x632/0x11d0 mm/mmap.c:851
 vma_adjust include/linux/mm.h:2256 [inline]
 __split_vma+0x208/0x350 mm/mmap.c:2675
 __do_munmap+0x20c/0xb40 mm/mmap.c:2762
 __vm_munmap+0xb2/0x130 mm/mmap.c:2836
 vm_munmap+0x29/0x40 mm/mmap.c:2854
 elf_map+0x1bd/0x200 fs/binfmt_elf.c:382
 load_elf_binary+0x89e/0x2d20 fs/binfmt_elf.c:984
 search_binary_handler fs/exec.c:1662 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1639
 exec_binprm fs/exec.c:1705 [inline]
 __do_execve_file.isra.0+0xb53/0x1120 fs/exec.c:1825
 do_execveat_common fs/exec.c:1871 [inline]
 do_execve+0x3c/0x60 fs/exec.c:1888
 call_usermodehelper_exec_async+0x3b0/0x400 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff8881233853e8 of 200 bytes by task 16298 on cpu 0:
 vm_area_dup+0x70/0xf0 kernel/fork.c:362
 __split_vma+0x88/0x350 mm/mmap.c:2646
 __do_munmap+0x20c/0xb40 mm/mmap.c:2762
 __vm_munmap+0xb2/0x130 mm/mmap.c:2836
 vm_munmap+0x29/0x40 mm/mmap.c:2854
 elf_map+0x1bd/0x200 fs/binfmt_elf.c:382
 load_elf_binary+0x89e/0x2d20 fs/binfmt_elf.c:984
 search_binary_handler fs/exec.c:1662 [inline]
 search_binary_handler+0x127/0x420 fs/exec.c:1639
 exec_binprm fs/exec.c:1705 [inline]
 __do_execve_file.isra.0+0xb53/0x1120 fs/exec.c:1825
 do_execveat_common fs/exec.c:1871 [inline]
 do_execve+0x3c/0x60 fs/exec.c:1888
 call_usermodehelper_exec_async+0x3b0/0x400 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 16298 Comm: modprobe Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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