netipsec/key.c ALPHA3 uma_zalloc->witness_warn, exclusive sleep mutex xforms_list (IPsec transforms list)

Hello,

unfortunately this is far beyond my scope and I forgot to report in time.
If this is begnin, feel free to ignore, but in any case I'd appreciate 
any comments.

uma_zalloc_arg: zone "1024" with the following non-sleepable locks held:
exclusive sleep mutex xforms_list (IPsec transforms list) r = 0 
(0xffffffff815385e0) locked _at_ 
/usr/local/share/deploy-tools/HEAD/src/sys/netipsec/key.c:8676
stack backtrace:
#0 0xffffffff8084c1a3 at witness_debugger+0x73
#1 0xffffffff8084d118 at witness_warn+0x448
#2 0xffffffff80ad4f48 at uma_zalloc_arg+0x38
#3 0xffffffff807bd12a at malloc+0x9a
#4 0xffffffff80a45953 at crypto_newsession+0x1d3
#5 0xffffffff80a354fc at esp_init+0x37c
#6 0xffffffff80a2dfec at key_setsaval+0x7ec
#7 0xffffffff80a2c9b2 at key_newsav+0x302
#8 0xffffffff80a27e77 at key_add+0x4c7
#9 0xffffffff80a22a4c at key_parse+0xa8c
#10 0xffffffff8087e557 at sosend_generic+0x457
#11 0xffffffff8087e78d at sosend+0x6d
#12 0xffffffff80885611 at kern_sendit+0x201
#13 0xffffffff80885979 at sendit+0x199
#14 0xffffffff808857cd at sys_sendto+0x4d
#15 0xffffffff80b3116c at amd64_syscall+0x28c
#16 0xffffffff80b0f1ed at fast_syscall_common+0x101
:
4 times repeatied with all addresses beeing identical.

Thanks,

-harry