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BUG: KCSAN: data-race in padata_reorder / padata_reorder

write to 0xffff88812a7171a4 of 4 bytes by task 21 on cpu 0:
 padata_find_next kernel/padata.c:281 [inline]
 padata_reorder+0x1e0/0x480 kernel/padata.c:310
 padata_do_serial+0x1a2/0x200 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+0x3cb/0x990 kernel/workqueue.c:2269
 process_scheduled_works kernel/workqueue.c:2331 [inline]
 worker_thread+0x81f/0xbe0 kernel/workqueue.c:2417
 kthread+0x210/0x220 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293

read to 0xffff88812a7171a4 of 4 bytes by task 19028 on cpu 1:
 padata_reorder+0x390/0x480 kernel/padata.c:342
 padata_do_serial+0x1a2/0x200 kernel/padata.c:423
 pcrypt_aead_enc+0x46/0x50 crypto/pcrypt.c:87
 padata_do_parallel+0x342/0x360 kernel/padata.c:229
 pcrypt_aead_encrypt+0x1b1/0x1e0 crypto/pcrypt.c:115
 crypto_aead_encrypt+0x59/0x70 crypto/aead.c:94
 _aead_recvmsg crypto/algif_aead.c:310 [inline]
 aead_recvmsg+0xabd/0xd00 crypto/algif_aead.c:330
 ____sys_recvmsg+0x15a/0x2e0 include/linux/uio.h:235
 ___sys_recvmsg net/socket.c:2617 [inline]
 __sys_recvmsg+0x1ce/0x3b0 net/socket.c:2651
 __do_sys_recvmsg net/socket.c:2661 [inline]
 __se_sys_recvmsg net/socket.c:2658 [inline]
 __x64_sys_recvmsg+0x42/0x50 net/socket.c:2658
 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19028 Comm: syz-executor.2 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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