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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff88811d5284e0 of 8 bytes by task 4058 on cpu 0:
 exec_mmap+0x128/0x300 fs/exec.c:1012
 begin_new_exec+0x794/0xfe0 fs/exec.c:1292
 load_elf_binary+0x636/0x1970 fs/binfmt_elf.c:996
 search_binary_handler fs/exec.c:1735 [inline]
 exec_binprm+0x1d9/0x800 fs/exec.c:1777
 bprm_execve+0x379/0x4e0 fs/exec.c:1851
 kernel_execve+0x65f/0x6c0 fs/exec.c:2016
 call_usermodehelper_exec_async+0x1a6/0x250 kernel/umh.c:113
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

read to 0xffff88811d5284e0 of 8 bytes by task 4064 on cpu 1:
 mm_update_next_owner+0x233/0x4b0 kernel/exit.c:487
 exit_mm+0xcb/0x170 kernel/exit.c:562
 do_exit+0x52b/0x16e0 kernel/exit.c:854
 do_group_exit+0xfe/0x140 kernel/exit.c:1010
 get_signal+0xb4b/0xc70 kernel/signal.c:2859
 arch_do_signal_or_restart+0x85/0x290 arch/x86/kernel/signal.c:306
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff888100d43b40

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4064 Comm: syz-executor.5 Not tainted 6.1.0-syzkaller-13872-gb6bb9676f216-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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