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BUG: KCSAN: data-race in copy_process / copy_process

write to 0xffffffff8927a410 of 4 bytes by task 25 on cpu 1:
 copy_process+0x2e84/0x3300 kernel/fork.c:2298
 _do_fork+0xf1/0x660 kernel/fork.c:2443
 kernel_thread+0x85/0xb0 kernel/fork.c:2531
 call_usermodehelper_exec_work+0x4f/0x1b0 kernel/umh.c:195
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffffffff8927a410 of 4 bytes by task 6119 on cpu 0:
 copy_process+0xac4/0x3300 kernel/fork.c:1980
 _do_fork+0xf1/0x660 kernel/fork.c:2443
 kernel_thread+0x85/0xb0 kernel/fork.c:2531
 call_usermodehelper_exec_work+0x4f/0x1b0 kernel/umh.c:195
 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269
 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415
 kthread+0x20d/0x230 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6119 Comm: kworker/u4:5 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound call_usermodehelper_exec_work
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