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BUG: KCSAN: data-race in padata_reorder / padata_reorder

write to 0xffff888121ee6e64 of 4 bytes by task 10687 on cpu 0:
 padata_find_next kernel/padata.c:281 [inline]
 padata_reorder+0x1e0/0x480 kernel/padata.c:310
 padata_do_serial+0x1a8/0x200 kernel/padata.c:423
 pcrypt_aead_enc+0x46/0x50 crypto/pcrypt.c:87
 padata_parallel_worker+0x37/0xd0 kernel/padata.c:157
 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 0xffff888121ee6e64 of 4 bytes by task 7 on cpu 1:
 padata_reorder+0x390/0x480 kernel/padata.c:342
 padata_do_serial+0x1a8/0x200 kernel/padata.c:423
 pcrypt_aead_enc+0x46/0x50 crypto/pcrypt.c:87
 padata_parallel_worker+0x37/0xd0 kernel/padata.c:157
 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: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
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