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[lwip-devel] [bug #30889] lwIP hangs on sending small packages

From: Ingo Ferchland
Subject: [lwip-devel] [bug #30889] lwIP hangs on sending small packages
Date: Fri, 27 Aug 2010 15:05:39 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-GB; rv: Gecko/2010010604 Ubuntu/9.04 (jaunty) Firefox/3.0.17


                 Summary: lwIP hangs on sending small packages
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: ferch
            Submitted on: Fr 27 Aug 2010 15:05:38 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: CVS Head



I use the ATMEL AVR32 lwIP port with FreeRTOS. The error occured on version
1.32 and CVS Head too.

Attached a slightly modified example "tcpecho".
To crash lwip, set the line 32 in the example to "#if 1" and send with Win32
Hyperterm Application some text quickly. (Insert some text in the Hypertem
window with CTRL+V)

After some text (about 50 chars), lwIP will hang at sys_arch_sem_wait()
trying to get the semaphore "op_completed" for the last netconn_write.

The error does *not* occur with the linux telnet client! (Sending too slow?)


File Attachments:

Date: Fr 27 Aug 2010 15:05:38 GMT  Name: task.c  Size: 1kB   By: ferch



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