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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88800f523d57 of 1 bytes by task 30486 on cpu 0:
 af_alg_sendmsg+0x336/0xcb0 crypto/af_alg.c:875
 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_sendto+0x2a8/0x370 net/socket.c:1975
 __do_sys_sendto net/socket.c:1987 [inline]
 __se_sys_sendto net/socket.c:1983 [inline]
 __x64_sys_sendto+0x74/0x90 net/socket.c:1983
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88800f523d57 of 1 bytes by task 30574 on cpu 1:
 af_alg_wait_for_data+0x194/0x3b0 crypto/af_alg.c:774
 _skcipher_recvmsg crypto/algif_skcipher.c:65 [inline]
 skcipher_recvmsg+0x17a/0x7f0 crypto/algif_skcipher.c:157
 ____sys_recvmsg+0x15d/0x310 include/linux/uio.h:234
 ___sys_recvmsg net/socket.c:2610 [inline]
 do_recvmmsg+0x4b3/0x990 net/socket.c:2710
 __sys_recvmmsg net/socket.c:2789 [inline]
 __do_sys_recvmmsg net/socket.c:2812 [inline]
 __se_sys_recvmmsg net/socket.c:2805 [inline]
 __x64_sys_recvmmsg+0xcf/0x150 net/socket.c:2805
 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: 30574 Comm: syz-executor.2 Not tainted 5.11.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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