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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff888124e8b248 of 8 bytes by task 27446 on cpu 1:
 exec_mmap+0x13e/0x360 fs/exec.c:1017
 begin_new_exec+0x7a2/0x1010 fs/exec.c:1297
 load_elf_binary+0x62a/0x1970 fs/binfmt_elf.c:1002
 search_binary_handler fs/exec.c:1728 [inline]
 exec_binprm+0x1d9/0x800 fs/exec.c:1769
 bprm_execve+0x379/0x4e0 fs/exec.c:1838
 kernel_execve+0x65f/0x6c0 fs/exec.c:2003
 call_usermodehelper_exec_async+0x1a6/0x250 kernel/umh.c:112
 ret_from_fork+0x1f/0x30

read to 0xffff888124e8b248 of 8 bytes by task 27456 on cpu 0:
 mm_update_next_owner+0x23c/0x4e0 kernel/exit.c:435
 exit_mm+0xd3/0x170 kernel/exit.c:509
 do_exit+0x51d/0x1720 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+0x46/0xb0

value changed: 0x0000000000000000 -> 0xffff88811ce8c000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27456 Comm: syz-executor.0 Not tainted 5.19.0-rc1-syzkaller-00243-ga32e7ea36235-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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