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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff888108d9cc20 of 8 bytes by task 20400 on cpu 1:
 exec_mmap+0x13e/0x360 fs/exec.c:1012
 begin_new_exec+0x7a4/0xff0 fs/exec.c:1292
 load_elf_binary+0x637/0x1970 fs/binfmt_elf.c:1002
 search_binary_handler fs/exec.c:1725 [inline]
 exec_binprm+0x1d9/0x800 fs/exec.c:1766
 bprm_execve+0x379/0x4e0 fs/exec.c:1835
 kernel_execve+0x65f/0x6c0 fs/exec.c:2000
 call_usermodehelper_exec_async+0x1a6/0x250 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff888108d9cc20 of 8 bytes by task 20403 on cpu 0:
 mm_update_next_owner+0x233/0x4b0 kernel/exit.c:435
 exit_mm+0xd3/0x170 kernel/exit.c:509
 do_exit+0x525/0x16e0 kernel/exit.c:782
 do_group_exit+0xa5/0x160 kernel/exit.c:925
 get_signal+0xf54/0x1020 kernel/signal.c:2857
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff88811d9c2c00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 20403 Comm: syz-executor.2 Not tainted 6.0.0-syzkaller-06475-g4c86114194e6-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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