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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff8880acf3e7d7 of 1 bytes by task 4668 on cpu 1:
 af_alg_sendmsg+0x3a7/0xc90 crypto/af_alg.c:852
 skcipher_sendmsg+0x71/0x80 crypto/algif_skcipher.c:47
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2359
 ___sys_sendmsg net/socket.c:2413 [inline]
 __sys_sendmmsg+0x322/0x4b0 net/socket.c:2503
 __do_sys_sendmmsg net/socket.c:2532 [inline]
 __se_sys_sendmmsg net/socket.c:2529 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2529
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880acf3e7d7 of 1 bytes by task 4676 on cpu 0:
 af_alg_wait_for_data+0x170/0x380 crypto/af_alg.c:757
 _skcipher_recvmsg crypto/algif_skcipher.c:65 [inline]
 skcipher_recvmsg+0x178/0x800 crypto/algif_skcipher.c:157
 ____sys_recvmsg+0x15a/0x2e0 include/linux/uio.h:235
 ___sys_recvmsg net/socket.c:2624 [inline]
 __sys_recvmsg+0x1ce/0x3b0 net/socket.c:2658
 __do_sys_recvmsg net/socket.c:2668 [inline]
 __se_sys_recvmsg net/socket.c:2665 [inline]
 __x64_sys_recvmsg+0x42/0x50 net/socket.c:2665
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4676 Comm: syz-executor.5 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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