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BUG: KCSAN: data-race in copy_process / release_task

write to 0xffffffff8927a410 of 4 bytes by task 10890 on cpu 0:
 __unhash_process kernel/exit.c:73 [inline]
 __exit_signal kernel/exit.c:147 [inline]
 release_task+0x6c8/0xb90 kernel/exit.c:198
 exit_notify kernel/exit.c:680 [inline]
 do_exit+0x1140/0x16e0 kernel/exit.c:826
 do_group_exit+0xcb/0x180 kernel/exit.c:903
 get_signal+0xdee/0x1520 kernel/signal.c:2739
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x127/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath+0x47/0x60 arch/x86/entry/common.c:329
 do_syscall_64+0x5d/0xb0 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff8927a410 of 4 bytes by task 10895 on cpu 1:
 copy_process+0xac4/0x3300 kernel/fork.c:1980
 _do_fork+0xf1/0x660 kernel/fork.c:2443
 __do_sys_clone kernel/fork.c:2599 [inline]
 __se_sys_clone kernel/fork.c:2580 [inline]
 __x64_sys_clone+0xfb/0x120 kernel/fork.c:2580
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10895 Comm: syz-executor.3 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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