[lwip-devel] [bug #47666] lwip crash inside do_writemore when used in iOS extension

[richardhu]

URL:
  <http://savannah.nongnu.org/bugs/?47666>

                 Summary: lwip crash inside do_writemore when used in iOS
extension
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: hyr666
            Submitted on: Tue 12 Apr 2016 09:11:49 AM GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Crash Error
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: 1.4.1

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Details:

lwip is used inside iOS extension to receive IP packets. and then use socket
API to get TCP content and then send the data out.
the simple http connection works well and the request and response all works.
but, when too many connections made - eg. 10-20 http connections. the lwip
will crash.
all the time it will crash at do_writemore()
most time at this assert line:
  LWIP_ASSERT("conn->write_offset < conn->current_msg->msg.w.len",
    conn->write_offset < conn->current_msg->msg.w.len);
and some time also at 
  LWIP_ASSERT("conn->pcb.tcp != NULL", conn->pcb.tcp != NULL);
all the settings are default (like #define MEM_SIZE 1048576)
is this issue caused by limitation of resource usage in extension?
or what information need for proceed solve this issue?




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