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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff888100de8a20 of 8 bytes by task 9244 on cpu 1:
 exec_mmap+0x11c/0x310 fs/exec.c:1012
 begin_new_exec+0x6a8/0xf10 fs/exec.c:1293
 load_elf_binary+0x641/0x1970 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1736 [inline]
 exec_binprm fs/exec.c:1778 [inline]
 bprm_execve+0x539/0xcc0 fs/exec.c:1853
 kernel_execve+0x614/0x670 fs/exec.c:2020
 call_usermodehelper_exec_async+0x199/0x240 kernel/umh.c:110
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff888100de8a20 of 8 bytes by task 9247 on cpu 0:
 mm_update_next_owner+0x1a2/0x410 kernel/exit.c:487
 exit_mm+0xd9/0x180 kernel/exit.c:562
 do_exit+0x589/0x1710 kernel/exit.c:856
 do_group_exit+0x141/0x150 kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1028
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff888136fc7600

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9247 Comm: syz-executor.5 Not tainted 6.3.0-rc1-syzkaller-00019-g6a98c9cae232 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
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