buglwIP - A Lightweight TCP/IP stack - Bugs: bug #56487, [v2.1.2] crash when TCP continuous...


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bug #56487: [v2.1.2] crash when TCP continuous write encounter wifi disconnect

Submitted by:  Song Pu <pusong666>
Submitted on:  Thu 13 Jun 2019 08:19:56 AM UTC  
Category:  sockets/netconn Severity:  3 - Normal
Item Group:  Crash Error Status:  Invalid
Privacy:  Public Assigned to:  None
Open/Closed:  Closed Planned Release:  None
lwIP version:  2.1.1

Tue 25 Jun 2019 06:20:00 PM UTC, comment #3: 

As David already said it, you're doing things wrong. Closing as invalid.

Simon Goldschmidt <goldsimon>
Project Administrator
Fri 21 Jun 2019 01:56:56 PM UTC, comment #2: 

`netif_set_addr()` calls LWIP_ASSERT_CORE_LOCKED(). So this function MUST be called from the Lwip task, not your wifi task.

Use `netifapi_netif_set_addr` is you require changing the ipaddr from another task.

David GIRAULT <dgirault>
Sat 15 Jun 2019 01:47:28 AM UTC, comment #1: 

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.

Song Pu <pusong666>
Thu 13 Jun 2019 08:19:56 AM UTC, original submission:  

reproduce ratio:

lwip option:
enable socket etc.

reproduce step:
1. TCP Socket write large data continuously
2. disconnect wifi´╝î then our code will handle "wifi_disconnect" event to netif_set_addr(sta_if, IP4_ADDR_ANY, IP4_ADDR_ANY, IP4_ADDR_ANY)

crash due to conn->pcb or conn->current_msg == NULL in lwip_netconn_do_writemore

Song Pu <pusong666>


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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2019-06-25 goldsimon StatusNone => Invalid
        Open/ClosedOpen => Closed

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