syzbot

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BUG: KCSAN: data-race in af_alg_sendmsg / af_alg_wait_for_data

write to 0xffff88810d27ee57 of 1 bytes by task 10352 on cpu 0:
 af_alg_sendmsg+0x3d8/0xd10 crypto/af_alg.c:875
 skcipher_sendmsg crypto/algif_skcipher.c:47 [inline]
 skcipher_sendmsg_nokey+0x172/0x190 crypto/algif_skcipher.c:246
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2348
 ___sys_sendmsg net/socket.c:2402 [inline]
 __sys_sendmmsg+0x335/0x4b0 net/socket.c:2492
 __do_sys_sendmmsg net/socket.c:2521 [inline]
 __se_sys_sendmmsg net/socket.c:2518 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2518
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810d27ee57 of 1 bytes by task 10350 on cpu 1:
 af_alg_wait_for_data+0x194/0x3c0 crypto/af_alg.c:774
 _skcipher_recvmsg crypto/algif_skcipher.c:65 [inline]
 skcipher_recvmsg+0x17a/0x7f0 crypto/algif_skcipher.c:157
 skcipher_recvmsg_nokey+0x12a/0x150 crypto/algif_skcipher.c:270
 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+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10350 Comm: syz-executor.5 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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