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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff888165eb0b60 of 8 bytes by task 26265 on cpu 1:
 exec_mmap+0x14a/0x430 fs/exec.c:1013
 begin_new_exec+0x6a8/0xf10 fs/exec.c:1294
 load_elf_binary+0x641/0x1950 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1737 [inline]
 exec_binprm fs/exec.c:1779 [inline]
 bprm_execve+0x539/0xcc0 fs/exec.c:1854
 kernel_execve+0x614/0x670 fs/exec.c:2022
 call_usermodehelper_exec_async+0x199/0x240 kernel/umh.c:110
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff888165eb0b60 of 8 bytes by task 26267 on cpu 0:
 mm_update_next_owner+0x1a2/0x410 kernel/exit.c:491
 exit_mm+0xdc/0x180 kernel/exit.c:566
 do_exit+0x580/0x1670 kernel/exit.c:861
 do_group_exit+0x101/0x150 kernel/exit.c:1024
 get_signal+0xeb7/0xff0 kernel/signal.c:2876
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff888140311000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26267 Comm: syz-executor.4 Not tainted 6.4.0-rc5-syzkaller-00016-ga4d7d7011219 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
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