[lwip-devel] [bug #25695] Segmentation fault in do_writemore(struct netconn *conn)

[Simon Braun]

Follow-up Comment #6, bug #25695 (project lwip):

Hi guys, I just diagnosed exactly the same problem here at InnerRange, and
came up with the same solution (setting netconn->state to NETCONN_NONE before
the call to API_EVENT).  I have tested this solution overnight and the problem
has not recurred (was occuring within 1 hour).  I think this is the correct
fix because when write_msg is set to NULL, the netconn is in an intermediate,
invalid state, until the 'finished' code is executed.  API_EVENT must not be
called while the netconn is invalid, so the simple solution is to set the
state to NETCONN_NONE early.  I can see how using sys_arch_sem_wait fixes the
problem but it will have other unexplored consequences.

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