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BUG: KCSAN: data-race in copy_process / release_task

write to 0xffffffff861e7cf8 of 4 bytes by task 26874 on cpu 0:
 __unhash_process kernel/exit.c:74 [inline]
 __exit_signal kernel/exit.c:157 [inline]
 release_task+0x74f/0xc60 kernel/exit.c:207
 exit_notify kernel/exit.c:683 [inline]
 do_exit+0xedc/0x18a0 kernel/exit.c:822
 __module_put_and_exit+0x2c/0x30 kernel/module.c:339
 cryptomgr_test+0x32/0x40 crypto/algboss.c:214
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffffffff861e7cf8 of 4 bytes by task 7 on cpu 1:
 copy_process+0x9eb/0x3b40 kernel/fork.c:1969
 _do_fork+0xfe/0x7a0 kernel/fork.c:2436
 kernel_thread+0xa4/0xd0 kernel/fork.c:2523
 call_usermodehelper_exec_sync kernel/umh.c:135 [inline]
 call_usermodehelper_exec_work+0x75/0x190 kernel/umh.c:187
 process_one_work+0x413/0x8f0 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.6.0-rc1-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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