Witness warning with SCTP

Hi,

I am running one of the SCTP tests in the ACE library,
and am getting the following witness warning.  Any ideas what the cause
is?

Thanks.

malloc(M_WAITOK) of "1024", forcing M_NOWAIT with the following non-sleepable locks held:
exclusive sleep mutex sctp-create (inp_create) r = 0 (0xc2ddded0) locked _at_ /usr/src/sys/netinet/sctp_input.c:4006
KDB: stack backtrace:
db_trace_self_wrapper(c09bf21a) at db_trace_self_wrapper+0x25
kdb_backtrace(1,400,c146d5a0,6,cbd70148,...) at kdb_backtrace+0x29
witness_warn(5,0,c09dac6c,c09701c9) at witness_warn+0x192
uma_zalloc_arg(c146d5a0,0,2) at uma_zalloc_arg+0x41
malloc(400,c0a50840,2,c28cf3e4,cbd701ac,...) at malloc+0xb2
hashinit(100,c0a50840,c2dde80c,f1,c28cf3e4,...) at hashinit+0x3b
sctp_inpcb_alloc(c28cf3e4) at sctp_inpcb_alloc+0x143
sctp_attach(c28cf3e4,0,0) at sctp_attach+0x34
sonewconn(c28a9530,2,c2ddff48,0,c09cf2c5,839) at sonewconn+0x119
sctp_handle_cookie_echo(c297e900,14,20,c297e948,cbd70390,cbd70bbc,cbd70bc0,cbd70c20,0,0,0,cbd70384) at sctp_handle_cookie_echo+0x77e
sctp_process_control(c297e900,14,cbd70c08,1ac,c297e948,c297e954,c2dddc10,c2ddfa50,cbd70c20,cbd70be8) at sctp_process_control+0xd89
sctp_common_input_processing(cbd70c3c,14,20,1ac,c297e948,c297e954,c2dddc10,0,c2de1570,0) at sctp_common_input_processing+0x72
sctp_input(c297e900,14,ae,100007f,0,...) at sctp_input+0x2fa
ip_input(c297e900) at ip_input+0x5c5
netisr_processqueue(c0af3658) at netisr_processqueue+0x6e
swi_net(0) at swi_net+0xc2
ithread_execute_handlers(c210b6c0,c2129900) at ithread_execute_handlers+0x11e
ithread_loop(c20ed960,cbd70d38) at ithread_loop+0x67
fork_exit(c06bbd2c,c20ed960,cbd70d38) at fork_exit+0xac
fork_trampoline() at fork_trampoline+0x8

-- 
Craig Rodrigues        
rodrigc_at_crodrigues.org