freebsd-vm: Stuck in a bootloop

Hello!

We recently noticed FreeBSD GitHub Actions timing out due to being stuck in a boot loop. ci log: https://github.com/libsdl-org/SDL/actions/runs/6464128982/job/17548308002

The following message is printed every 2s over and over again:

2023-10-10T04:08:13.4019400Z <<BOOT>>—-——
2023-10-10T04:08:13.4029930Z Copyright (c) 1992-2821 The FreeBSD Project.
2023-10-10T04:08:13.4038380Z Copyright (c) 1979, 1988, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
2023-10-10T04:08:13.4060030Z The Regents of the University of California. All rights reserved.
2023-10-10T04:08:13.4066080Z FreeBSD is a registered trademark of The FreeBSD Foundation.
2023-10-10T04:08:13.4079190Z FreeBSD 13.2-RELEASE releng/13.2-n254617-525ecfdad597 GENERIC amd64
2023-10-10T04:08:13.4080880Z FreeBSD clang version 14.8.5 (https://github.com/Ilvm/1lvm-project .git 1lvmorg-1
2023-10-10T04:08:13.4082420Z 4.8.5-8-gc12386ae247c)
2023-10-10T04:08:13.4084490Z VT (vga): text 88x25
2023-10-10T04:08:13.4086040Z CPU: Intel(R) Core(TM) i7-8708B CPU @ 3.2@GHz (3192.98-MHz KB-class CPU)
2023-10-10T04:08:13.4088090Z Origin="GenuineIntel” Id=@x3@6aa_ Family=@x6 Model=@x3a Stepping=18
2023-10-10T04:08:13.4090070Z Features=@x1783f bff <FPU, VME ,DE,PSE,TSC.MSR,PAE MCE ,CX8,APIC,SEP.MTRR,PGE .MCA.C
2023-10-10T04:08:13.4092310Z HOV. PAT ,PSE36 , MMX,FXSR SSE ,SSE2,HTT>
2023-10-10T04:08:13.4094220Z Features2=@x5eda2283<SSE3 , PCLMULQDO, SSSE3,CX16,PCID,SSE4.1,5SE4.2,MOVBE ,POPCNT
2023-10-10T04:08:13.4096340Z /AESNI, XSAVE , OSXSAVE , AVX, RDRAND>
2023-10-10T04:08:13.4098150Z AND Features=@x20188880<SYSCALL .NX.LM>
2023-10-10T04:08:13.4099950Z AND Features2=8x121<LAHF ,ABM,Prefetch>
2023-10-10T04:08:13.4101860Z Structured Extended Features=@x842421<FSGSBASE ,AVX2, INVPCID.NFPUSG , RDSEED, CLFL
2023-10-10T04:08:13.4103700Z USHOPT>
2023-10-10T04:08:13.4105450Z real memory = 9126885584 (8784 MB)
2023-10-10T04:08:13.4107220Z avail memory = 8291483648 (7987 MB)
2023-10-10T04:08:13.4109100Z Event timer “LAPIC” quality 108
2023-10-10T04:08:13.4110930Z ACPI APIC Table: <VBOX  VBOXAPIC>