panic: syncache: mbuf too small

Hi,

I just came to a console finding this.  The tree is from a few days ago;  is this known or should I investigate if it happens again?   I sadly cannot dump on this machine.

/bz

db> show panic
panic: syncache: mbuf too small
db> where 
Tracing pid 0 tid 100014 td 0xfffffe000937a740
kdb_enter() at kdb_enter+0x37/frame 0xfffffe0007fa15b0
vpanic() at vpanic+0x1b0/frame 0xfffffe0007fa1600
panic() at panic+0x43/frame 0xfffffe0007fa1660
syncache_respond() at syncache_respond+0x777/frame 0xfffffe0007fa1730
syncache_add() at syncache_add+0xa71/frame 0xfffffe0007fa18c0
tcp_input_with_port() at tcp_input_with_port+0x14f5/frame 0xfffffe0007fa1a20
tcp6_input_with_port() at tcp6_input_with_port+0x69/frame 0xfffffe0007fa1a50
tcp6_input() at tcp6_input+0xb/frame 0xfffffe0007fa1a60
ip6_input() at ip6_input+0xc2f/frame 0xfffffe0007fa1b40
netisr_dispatch_src() at netisr_dispatch_src+0xaf/frame 0xfffffe0007fa1ba0
ether_demux() at ether_demux+0x16e/frame 0xfffffe0007fa1bd0
ether_nh_input() at ether_nh_input+0x3fc/frame 0xfffffe0007fa1c30
netisr_dispatch_src() at netisr_dispatch_src+0xaf/frame 0xfffffe0007fa1c90
ether_input() at ether_input+0x99/frame 0xfffffe0007fa1cf0
iflib_rxeof() at iflib_rxeof+0xcb3/frame 0xfffffe0007fa1e00
_task_fn_rx() at _task_fn_rx+0x7a/frame 0xfffffe0007fa1e40
gtaskqueue_run_locked() at gtaskqueue_run_locked+0xa7/frame 0xfffffe0007fa1ec0
gtaskqueue_thread_loop() at gtaskqueue_thread_loop+0xc2/frame 0xfffffe0007fa1ef0
fork_exit() at fork_exit+0x80/frame 0xfffffe0007fa1f30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0007fa1f30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---


-- 
Bjoern A. Zeeb                                                     r15:7