Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller [off-list ref]:

On Tue, 14 Jun 2022 17:25:57 +0800 you wrote:

The skb_recv_datagram() in ax25_recvmsg() will hold lock_sock
and block until it receives a packet from the remote. If the client
doesn`t connect to server and calls read() directly, it will not
receive any packets forever. As a result, the deadlock will happen.

The fail log caused by deadlock is shown below:

[...]

Here is the summary with links:
  - [net,v5] net: ax25: Fix deadlock caused by skb_recv_datagram in ax25_recvmsg
    https://git.kernel.org/netdev/net/c/219b51a6f040

You are awesome, thank you!
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