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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88805c2ad5c8 of 8 bytes by task 13924 on cpu 0:
 af_alg_sendmsg+0xa46/0xc60 crypto/af_alg.c:928
 aead_sendmsg+0x7c/0x90 crypto/algif_aead.c:71
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 sock_write_iter+0x1a1/0x200 net/socket.c:999
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write fs/read_write.c:484 [inline]
 __vfs_write+0x2d8/0x340 fs/read_write.c:497
 vfs_write+0x19b/0x350 fs/read_write.c:559
 ksys_write+0xce/0x180 fs/read_write.c:612
 __do_sys_write fs/read_write.c:624 [inline]
 __se_sys_write fs/read_write.c:621 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:621
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88805c2ad5c8 of 8 bytes by task 13930 on cpu 1:
 af_alg_wait_for_data+0x133/0x270 crypto/af_alg.c:757
 _aead_recvmsg crypto/algif_aead.c:110 [inline]
 aead_recvmsg+0x271/0xd00 crypto/algif_aead.c:330
 ____sys_recvmsg+0x15a/0x2e0 include/linux/uio.h:235
 ___sys_recvmsg net/socket.c:2617 [inline]
 do_recvmmsg+0x35c/0xa30 net/socket.c:2715
 __sys_recvmmsg net/socket.c:2794 [inline]
 __do_sys_recvmmsg net/socket.c:2817 [inline]
 __se_sys_recvmmsg net/socket.c:2810 [inline]
 __x64_sys_recvmmsg+0xcc/0x150 net/socket.c:2810
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13930 Comm: syz-executor.0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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