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BUG: KCSAN: data-race in bprm_execve / copy_process

write to 0xffff8881395ddf90 of 4 bytes by task 4166 on cpu 0:
 bprm_execve+0x4c6/0x530 fs/exec.c:1858
 do_execveat_common+0x63b/0x700 fs/exec.c:1924
 do_execve fs/exec.c:1992 [inline]
 __do_sys_execve fs/exec.c:2068 [inline]
 __se_sys_execve fs/exec.c:2063 [inline]
 __x64_sys_execve+0x56/0x70 fs/exec.c:2063
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881395ddf90 of 4 bytes by task 4162 on cpu 1:
 copy_fs kernel/fork.c:1521 [inline]
 copy_process+0xead/0x2fa0 kernel/fork.c:2185
 kernel_clone+0x15c/0x680 kernel/fork.c:2584
 __do_sys_clone kernel/fork.c:2701 [inline]
 __se_sys_clone kernel/fork.c:2685 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2685
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000001 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4162 Comm: syz-executor.5 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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