TrueNAS CORE Crash and server reboot

[ManuR]

Hello,
I have TrueNAS CORE 13.0-U3.1 and yesterday the system crashed and reboots.
I check from hardware perspective but nothing happened and no error.
I perform hardware diagnostic but are all ok.

I check on /var/log/messages but I not find anything.
I find some files on /data/crash, and on ddb.txt I find this:

db:0:kdb.enter.default> bt
Tracing pid 6 tid 100921 td 0xfffffe01a52c6900
kdb_enter() at kdb_enter+0x37/frame 0xfffffe026d25cae0
vpanic() at vpanic+0x1b0/frame 0xfffffe026d25cb30
panic() at panic+0x43/frame 0xfffffe026d25cb90
trap_fatal() at trap_fatal+0x385/frame 0xfffffe026d25cbf0
trap_pfault() at trap_pfault+0x4f/frame 0xfffffe026d25cc50
calltrap() at calltrap+0x8/frame 0xfffffe026d25cc50
--- trap 0xc, rip = 0xffffffff82a482c3, rsp = 0xfffffe026d25cd20, rbp = 0xfffffe026d25cd60 ---
arc_change_state() at arc_change_state+0x4a3/frame 0xfffffe026d25cd60
arc_evict_state() at arc_evict_state+0x54b/frame 0xfffffe026d25ce40
arc_evict_cb() at arc_evict_cb+0x6ab/frame 0xfffffe026d25cea0
zthr_procedure() at zthr_procedure+0x92/frame 0xfffffe026d25cef0
fork_exit() at fork_exit+0x7e/frame 0xfffffe026d25cf30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe026d25cf30
--- trap 0, rip = 0xffffffff80aa32cf, rsp = 0, rbp = 0xffffffff832fdfa0 ---
mi_startup() at mi_startup+0xdf/frame 0xffffffff832fdfa0
swapper() at swapper+0x69/frame 0xffffffff832fdff0
btext() at btext+0x22
db:0:kdb.enter.default> show allpcpu
Current CPU: 14


But I not understand anything.
How I can troubleshoot this problem for understand what happened ?
Thanks in advance
Manu