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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88809c980748 of 8 bytes by task 9275 on cpu 0:
 af_alg_sendmsg+0x440/0xc20 crypto/af_alg.c:932
 aead_sendmsg+0x89/0xa0 crypto/algif_aead.c:71
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0x9f/0xc0 net/socket.c:672
 ____sys_sendmsg+0x49d/0x4d0 net/socket.c:2343
 ___sys_sendmsg+0xb5/0x100 net/socket.c:2397
 __sys_sendmsg+0xa0/0x160 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg net/socket.c:2437 [inline]
 __x64_sys_sendmsg+0x51/0x70 net/socket.c:2437
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809c980748 of 8 bytes by task 9269 on cpu 1:
 af_alg_wait_for_data+0x1ce/0x2e0 crypto/af_alg.c:761
 _aead_recvmsg crypto/algif_aead.c:110 [inline]
 aead_recvmsg+0x477/0xd60 crypto/algif_aead.c:330
 sock_recvmsg_nosec net/socket.c:886 [inline]
 sock_recvmsg net/socket.c:904 [inline]
 sock_recvmsg+0x92/0xb0 net/socket.c:900
 sock_read_iter+0x17c/0x220 net/socket.c:982
 call_read_iter include/linux/fs.h:1895 [inline]
 aio_read+0x172/0x240 fs/aio.c:1543
 __io_submit_one fs/aio.c:1829 [inline]
 io_submit_one+0x63b/0xdb0 fs/aio.c:1878
 __do_sys_io_submit fs/aio.c:1937 [inline]
 __se_sys_io_submit fs/aio.c:1907 [inline]
 __x64_sys_io_submit+0x104/0x2a0 fs/aio.c:1907
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9269 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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