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BUG: KCSAN: data-race in padata_find_next / padata_reorder

write to 0xffff88807ab24264 of 4 bytes by task 8390 on cpu 0:
 padata_find_next+0x1d5/0x260 kernel/padata.c:206
 padata_reorder+0x18b/0x270 kernel/padata.c:235
 padata_do_serial+0x17a/0x1b0 kernel/padata.c:347
 pcrypt_aead_enc+0x51/0x80 crypto/pcrypt.c:87
 padata_parallel_worker+0x1ae/0x220 kernel/padata.c:83
 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

read to 0xffff88807ab24264 of 4 bytes by task 8352 on cpu 1:
 padata_reorder+0x1c1/0x270 kernel/padata.c:267
 padata_do_serial+0x17a/0x1b0 kernel/padata.c:347
 pcrypt_aead_enc+0x51/0x80 crypto/pcrypt.c:87
 padata_parallel_worker+0x1ae/0x220 kernel/padata.c:83
 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: 8352 Comm: kworker/u4:6 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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