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BUG: KCSAN: data-race in exec_mmap / mm_update_next_owner

write to 0xffff888100246660 of 8 bytes by task 23099 on cpu 1:
 exec_mmap+0x14a/0x430 fs/exec.c:1014
 begin_new_exec+0x6b4/0xf20 fs/exec.c:1295
 load_elf_binary+0x647/0x1960 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1738 [inline]
 exec_binprm fs/exec.c:1780 [inline]
 bprm_execve+0x6d3/0xef0 fs/exec.c:1855
 kernel_execve+0x614/0x670 fs/exec.c:2023
 call_usermodehelper_exec_async+0x199/0x240 kernel/umh.c:110
 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

read to 0xffff888100246660 of 8 bytes by task 23101 on cpu 0:
 mm_update_next_owner+0x1a5/0x410 kernel/exit.c:491
 exit_mm+0xdb/0x180 kernel/exit.c:566
 do_exit+0x580/0x1670 kernel/exit.c:861
 do_group_exit+0x141/0x150 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000000 -> 0xffff88811d3fc000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23101 Comm: syz-executor.2 Not tainted 6.5.0-rc6-syzkaller-00036-g4853c74bd7ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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