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BUG: KCSAN: data-race in copy_process / ksys_unshare

write to 0xffff88810085e540 of 4 bytes by task 30639 on cpu 1:
 copy_fs kernel/fork.c:1522 [inline]
 copy_process+0x1055/0x2fd0 kernel/fork.c:2182
 kernel_clone+0x15c/0x6a0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810085e540 of 4 bytes by task 30646 on cpu 0:
 unshare_fs kernel/fork.c:2988 [inline]
 ksys_unshare+0x237/0x6f0 kernel/fork.c:3066
 __do_sys_unshare kernel/fork.c:3146 [inline]
 __se_sys_unshare kernel/fork.c:3144 [inline]
 __x64_sys_unshare+0x1b/0x20 kernel/fork.c:3144
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000005 -> 0x00000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30646 Comm: syz-executor.3 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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