The backtrace is shown between > bt and > ps so:
db:0:kdb.enter.default> bt
Tracing pid 33436 tid 100218 td 0xfffff8019628a000
kdb_enter() at kdb_enter+0x3b/frame 0xfffffe022fe863f0
vpanic() at vpanic+0x194/frame 0xfffffe022fe86450
panic() at panic+0x43/frame 0xfffffe022fe864b0
pmap_remove_pages() at pmap_remove_pages+0x7fc/frame 0xfffffe022fe86590
exec_new_vmspace() at exec_new_vmspace+0x1b5/frame 0xfffffe022fe86600
exec_elf64_imgact() at exec_elf64_imgact+0x931/frame 0xfffffe022fe866f0
kern_execve() at kern_execve+0x77c/frame 0xfffffe022fe86a40
sys_execve() at sys_execve+0x4a/frame 0xfffffe022fe86ac0
amd64_syscall() at amd64_syscall+0xa38/frame 0xfffffe022fe86bf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe022fe86bf0
--- syscall (59, FreeBSD ELF64, sys_execve), rip = 0x800b4664a, rsp = 0x7fffffffe858, rbp = 0x7fffffffe9a0 ---
db:0:kdb.enter.default> ps
and
db:0:kdb.enter.default> bt
Tracing pid 11 tid 100003 td 0xfffff80006200000
sleepq_resume_thread() at sleepq_resume_thread+0x2b/frame 0xfffffe01e676f670
sleepq_timeout() at sleepq_timeout+0xb5/frame 0xfffffe01e676f6b0
softclock_call_cc() at softclock_call_cc+0x13a/frame 0xfffffe01e676f760
callout_process() at callout_process+0x1ae/frame 0xfffffe01e676f7e0
handleevents() at handleevents+0x1a8/frame 0xfffffe01e676f830
timercb() at timercb+0x2a1/frame 0xfffffe01e676f880
hpet_intr_single() at hpet_intr_single+0x1b9/frame 0xfffffe01e676f8b0
hpet_intr() at hpet_intr+0x8e/frame 0xfffffe01e676f8f0
intr_event_handle() at intr_event_handle+0x8b/frame 0xfffffe01e676f940
intr_execute_handlers() at intr_execute_handlers+0x49/frame 0xfffffe01e676f970
lapic_handle_intr() at lapic_handle_intr+0x3f/frame 0xfffffe01e676f990
Xapic_isr1() at Xapic_isr1+0xd0/frame 0xfffffe01e676f990
--- interrupt, rip = 0xffffffff812f9426, rsp = 0xfffffe01e676fa60, rbp = 0xfffffe01e676fa60 ---
acpi_cpu_c1() at acpi_cpu_c1+0x6/frame 0xfffffe01e676fa60
acpi_cpu_idle() at acpi_cpu_idle+0x2e7/frame 0xfffffe01e676fab0
cpu_idle_acpi() at cpu_idle_acpi+0x3f/frame 0xfffffe01e676fad0
cpu_idle() at cpu_idle+0x95/frame 0xfffffe01e676faf0
sched_idletd() at sched_idletd+0x544/frame 0xfffffe01e676fbb0
fork_exit() at fork_exit+0x83/frame 0xfffffe01e676fbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe01e676fbf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
db:0:kdb.enter.default> ps
The curthread line shows whatever the current was, usually what caused the crash.
So, yes, all three of those are completely different which usually indicates a hardware issue of some sort.
Steve