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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff888120d14248 of 8 bytes by task 7949 on cpu 1:
 af_alg_sendmsg+0x438/0xc00 crypto/af_alg.c:932
 aead_sendmsg+0x83/0xa0 crypto/algif_aead.c:71
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x98/0xc0 net/socket.c:672
 ____sys_sendmsg+0x493/0x4c0 net/socket.c:2343
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2397
 __sys_sendmsg+0x9b/0x150 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x4c/0x60 net/socket.c:2437
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888120d14248 of 8 bytes by task 7945 on cpu 0:
 af_alg_wait_for_data+0x1cf/0x2e0 crypto/af_alg.c:761
 _aead_recvmsg crypto/algif_aead.c:110 [inline]
 aead_recvmsg+0x479/0xd40 crypto/algif_aead.c:330
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 sock_recvmsg+0x8e/0xb0 net/socket.c:900
 ____sys_recvmsg+0x144/0x350 net/socket.c:2566
 ___sys_recvmsg+0xb2/0x100 net/socket.c:2608
 __sys_recvmsg+0x98/0x140 net/socket.c:2642
 __do_sys_recvmsg net/socket.c:2652 [inline]
 __se_sys_recvmsg net/socket.c:2649 [inline]
 __x64_sys_recvmsg+0x4c/0x60 net/socket.c:2649
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7945 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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