Re: [lwip-users] LPC2468 with lwIP 1.4.x corrupting memory

[Mikael Eiman]

Hi again,

I'm going to reply to myself and say that I might finally have found the source 
of my problem: in the callback I set with tcp_err() I was calling tcp_close() 
on the connection. I removed that tcp_close() call, and things seem to be 
working better and I'm not leaking memory. So likely I was causing a double 
free(), which is a good way to corrupt memory.

regards,
        Mikael


12 nov 2012 kl. 18:51 skrev Mikael Eiman <address@hidden>:

> Hi,
> 
> I'm having trouble in a project where I'm using lwIP 1.4.x (tried 1.4.1 and 
> 1.4.0). I get my memory corrupted, and I can't figure out what I'm doing 
> wrong. 
> 
> The problem is easiest to reproduce when I'm unable to connect to the server, 
> after just a few tries I get stuck in a failed assert somewhere deep in lwIP, 
> or in a DAbt handler after malloc() runs off a cliff. Since this happens 
> without any data flowing around, the possible places where things can go 
> wrong should be limited.
> 
> I'm using FreeRTOS, but all the code that calls lwIP functions is contained 
> in a single task, which is why I'm using NO_SYS.
> 
> If I switch to the non-malloc() variants of memory handling the code runs 
> better, but still crashes sooner or later - the corruption is probably still 
> happening but contained to the lwIP static buffers it's less likely to cause 
> general mayhem.
> 
> Has anyone had a similar problem, or any suggestions for what kind of errors 
> I should be looking for in my code?
> 
> regards,
>       Mikael
> 
> 
> My lwIP configuration:
> 
> #define NO_SYS                      1
> #define SYS_LIGHTWEIGHT_PROT        1
> typedef int sys_prot_t;
> 
> #define MEM_LIBC_MALLOC             1 // Don't make this 1, or malloc() will 
> be all fucked up
> #define MEMP_MEM_MALLOC             1 // Don't make this 1, or malloc() will 
> be all fucked up
> #define MEM_ALIGNMENT               4
> #define MEM_SIZE                    (8 * 1024)
> #define MEMP_NUM_PBUF               64
> #define MEMP_NUM_UDP_PCB            4
> #define MEMP_NUM_TCP_PCB            4
> #define MEMP_NUM_TCP_PCB_LISTEN     2
> #define MEMP_NUM_TCP_SEG            32
> #define MEMP_NUM_REASSDATA          8
> #define MEMP_NUM_ARP_QUEUE          10
> #define MEMP_NUM_SYS_TIMEOUT        5
> #define PBUF_POOL_SIZE              32
> 
> #define LWIP_ARP                    1
> #define IP_REASS_MAX_PBUFS          8
> #define IP_FRAG_USES_STATIC_BUF     0
> #define IP_DEFAULT_TTL              255
> #define IP_SOF_BROADCAST            1
> #define IP_SOF_BROADCAST_RECV       1
> #define LWIP_ICMP                   1
> #define LWIP_BROADCAST_PING         0
> #define LWIP_MULTICAST_PING         0
> #define LWIP_RAW                    1
> #define LWIP_AUTOIP                 0
> #define TCP_MSS                     1460
> #define TCP_WND                     (4 * TCP_MSS)
> #define TCP_SND_BUF                 (6 * TCP_MSS)
> //#define TCP_SND_QUEUELEN            128 //(4 * (TCP_SND_BUF/TCP_MSS)) 
> #define TCP_LISTEN_BACKLOG          0
> #define LWIP_NETIF_STATUS_CALLBACK  1
> #define LWIP_NETIF_LINK_CALLBACK    1
> #define LWIP_NETIF_HWADDRHINT       1
> #define LWIP_NETCONN                0
> #define LWIP_SOCKET                 0
> #define ETHARP_TRUST_IP_MAC         0
> //#define ETH_PAD_SIZE                2
> #define LWIP_CHKSUM_ALGORITHM       2
> 
> #define LWIP_TCP_KEEPALIVE          1
> 
> // Keepalive values, compliant with RFC 1122. Don't change this unless you 
> know what you're doing
> #define TCP_KEEPIDLE_DEFAULT        10000UL // Default KEEPALIVE timer in 
> milliseconds
> #define TCP_KEEPINTVL_DEFAULT       2000UL  // Default Time between KEEPALIVE 
> probes in milliseconds
> #define TCP_KEEPCNT_DEFAULT         9U      // Default Counter for KEEPALIVE 
> probes
> 
> #define LWIP_STATS                  1
> #define LWIP_STATS_DISPLAY          1
> #define MEM_STATS                   1
> #define SYS_STATS                   1
> #define MEMP_STATS                  1
> #define LINK_STATS                  1
> 
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