[lwip-devel] [bug #21077] lwip_stats.mem.used is inaccurate, sometimes negative

[Mike Kleshov]

URL:
  <http://savannah.nongnu.org/bugs/?21077>

                 Summary: lwip_stats.mem.used is inaccurate, sometimes
negative
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: kleshov
            Submitted on: Friday 09/14/2007 at 13:54
                Category: pbufs
                Severity: 2 - Minor
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 

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Details:

While debugging my lwip-based application with LWIP_STATS switched on, I
found that lwip_stats.mem.used was assuming negative values (say,
lwip_stats.mem.used == 65532 which is effectively -4.)

There are only a few places where lwip_stats.mem.used is updated. My guess is
that it's mem.c, line 274:
lwip_stats.mem.used -= mem->next - ((u8_t *)mem - ram);

But I could be completely wrong. Could someone with knowledge of inner
workings of lwip memory management have a look at this?




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