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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88810a7e3fd4 of 1 bytes by task 1515 on cpu 0:
 af_alg_sendmsg+0xad4/0xcb0 crypto/af_alg.c:968
 skcipher_sendmsg+0x71/0x80 crypto/algif_skcipher.c:47
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x352/0x4c0 net/socket.c:2345
 ___sys_sendmsg net/socket.c:2399 [inline]
 __sys_sendmsg+0x1ed/0x270 net/socket.c:2432
 __do_sys_sendmsg net/socket.c:2441 [inline]
 __se_sys_sendmsg net/socket.c:2439 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2439
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810a7e3fd4 of 1 bytes by task 1526 on cpu 1:
 af_alg_wait_for_data+0x1b0/0x3b0 crypto/af_alg.c:774
 _skcipher_recvmsg crypto/algif_skcipher.c:65 [inline]
 skcipher_recvmsg+0x17a/0x7f0 crypto/algif_skcipher.c:157
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2032
 __do_sys_recvfrom net/socket.c:2050 [inline]
 __se_sys_recvfrom net/socket.c:2046 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2046
 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: 1 PID: 1526 Comm: syz-executor.1 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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