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[lwip-devel] [bug #56487] [v2.1.2] crash when TCP continuous write encou
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From: |
Song Pu |
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Subject: |
[lwip-devel] [bug #56487] [v2.1.2] crash when TCP continuous write encounter wifi disconnect |
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Date: |
Fri, 14 Jun 2019 21:47:28 -0400 (EDT) |
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User-agent: |
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.170 Safari/537.36 |
Follow-up Comment #1, bug #56487 (project lwip):
Further explanation:
1. TCP Socket write large data in TaskA
2. disconnect wifi -> "wifi_disconnect" callback then netif_set_addr(sta_if,
IP4_ADDR_ANY, IP4_ADDR_ANY, IP4_ADDR_ANY) in TaskB(wifi task is higher
priority.)
3. TaskA may be switch to TaskB when TaskA is running
lwip_netconn_do_writemore "conn->current_msg->msg.w.offset += len" or
"sys_sem_t *op_completed_sem = LWIP_API_MSG_SEM(conn->current_msg)".
But TaskB
netif_set_addr->netif_do_ip_addr_changed->tcp_netif_ip_addr_changed_pcblist->tcp_abort->err_tcp->conn->current_msg=NULL.
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