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BUG: KCSAN: data-race in padata_find_next / padata_reorder

write to 0xffff8880804a7024 of 4 bytes by task 741 on cpu 0:
 padata_find_next+0x1d0/0x250 kernel/padata.c:206
 padata_reorder+0x18f/0x280 kernel/padata.c:235
 padata_do_serial+0x171/0x1a0 kernel/padata.c:347
 pcrypt_aead_enc+0x49/0x70 crypto/pcrypt.c:87
 padata_parallel_worker+0x1af/0x220 kernel/padata.c:83
 process_one_work+0x424/0x930 kernel/workqueue.c:2264
 process_scheduled_works+0x4b/0xa0 kernel/workqueue.c:2326
 worker_thread+0x4e7/0x7e0 kernel/workqueue.c:2412
 kthread+0x1cb/0x1f0 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff8880804a7024 of 4 bytes by task 21 on cpu 1:
 padata_reorder+0x1c9/0x280 kernel/padata.c:267
 padata_do_serial+0x171/0x1a0 kernel/padata.c:347
 pcrypt_aead_enc+0x49/0x70 crypto/pcrypt.c:87
 padata_parallel_worker+0x1af/0x220 kernel/padata.c:83
 process_one_work+0x424/0x930 kernel/workqueue.c:2264
 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2410
 kthread+0x1cb/0x1f0 kernel/kthread.c:255
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21 Comm: kworker/u4:1 Not tainted 5.6.0-rc1-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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