em driver issues

[EM1897 at aol.com]

In a message dated 2/3/05 2:37:35 PM Eastern Standard Time, 
dillon at xxxxxxxxxxxxxxxxxxxx writes:
:I got a NULL POINTER error, so its probably something with the ring 
overflow, 
:or maybe running out of mbuf clusters? There were no other error messages.
:It should be easy to duplicate, and not hard for me to debug once I compile
:DDB into my kernel.
:
:The same test on FBSD 4.9 and 4.10 work fine, so thats why I asked if an
:effort was underway to get the FreeBSD updates into dragonfly,as they may
:fix the problem.
:
:EM

>    This sounds like a network stack/mbuf issue.  Could you please post 
>    the backtrace of the panic ? 

Ok, here is the summary of the backtrace:

panic: Trying to free NULL pointer
panic()
free()
m_clalloc()
m_clget()
m_getcl()
em_get_buf()
em_process_receive_interrupt()
ss_receive_interrupts
em_intr()
intr_mux()
ithread_handler()
lwkt_exit()