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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff8881452ec5e0 of 8 bytes by task 17553 on cpu 0:
 exec_mmap+0x14a/0x430 fs/exec.c:1015
 begin_new_exec+0x6b4/0xf20 fs/exec.c:1296
 load_elf_binary+0x647/0x1960 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1739 [inline]
 exec_binprm fs/exec.c:1781 [inline]
 bprm_execve+0x6d3/0xef0 fs/exec.c:1856
 kernel_execve+0x614/0x670 fs/exec.c:2024
 call_usermodehelper_exec_async+0x199/0x240 kernel/umh.c:110
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff8881452ec5e0 of 8 bytes by task 17547 on cpu 1:
 mm_update_next_owner+0x1a5/0x410 kernel/exit.c:491
 exit_mm+0xdb/0x180 kernel/exit.c:566
 do_exit+0x580/0x1660 kernel/exit.c:861
 do_group_exit+0x101/0x150 kernel/exit.c:1024
 get_signal+0xf3c/0x1090 kernel/signal.c:2892
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:309
 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:285 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff888106def9c0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17547 Comm: syz-executor.0 Tainted: G        W          6.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
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