kernel: page fault trap, code=0
Stopped at      ffs2_balloc+0xa0a:      movq    0(%rcx,%rax,8),%r14
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
ffs2_balloc(fffff3806cf69900,3f000,1000,fffff38007ffd7b8,1,ffff80002a7bd748) at ffs2_balloc+0xa0a sys/ufs/ffs/ffs_balloc.c:614
ffs_write(ffff80002a7bd7d0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffff3807006ddb0,ffff80002a7bd860,0,fffff38007ffd7b8) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
uvn_io(fffff3806f03b698,ffff80002a7bd9e0,1,39,1) at uvn_io+0x485 sys/uvm/uvm_vnode.c:1232
uvm_pager_put(fffff3806f03b698,fffff380071fa300,ffff80002a7bda80,ffff80002a7bdaa4,39,0,7a78ffd68a671ca3) at uvm_pager_put+0x10a sys/uvm/uvm_pager.c:505
uvn_flush(fffff3806f03b698,0,0,19) at uvn_flush+0x68d sys/uvm/uvm_vnode.c:705
uvn_detach(fffff3806f03b698) at uvn_detach+0xb8 sys/uvm/uvm_vnode.c:344
uvm_unmap_detach(ffff80002a7bdbb0,0) at uvm_unmap_detach+0x15e sys/uvm/uvm_map.c:1370
uvm_map_teardown(fffff3807ec642e0) at uvm_map_teardown+0x357 sys/uvm/uvm_map.c:2536
exit1(ffff80002a7782a8,43,0,1) at exit1+0x6e6 sys/kern/kern_exit.c:259
sys_exit(ffff80002a7782a8,ffff80002a7bdd70,ffff80002a7bdcc0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a7bdd70) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a7bdd70) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x746894ab65e0, count: 2
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reports.  Insufficient info makes it difficult to find and fix bugs.
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff83a08128, 0xffff800019812018, 0, 1) -> d
ddb>