Encounter segmentation fault in the simulated OS in gem5 full system mode.

[oabt]

I'm running X86 gem5 full system simulation.
Disk image: ubuntu 22.04 (from gem5 resources)
Linux Kernel: 5.4.49 (from gem5 resources)

The simulation is started with KVM CPU and switched to Timing CPU after OS booted.
When I am trying to run some workloads through m5 readfile or directly input in interactive shell, seg faults may happen.
For example, simple "gdb -v" leads to seg fault.

The workloads successfully run if I boot the same disk image in QEMU.

I wonder if anybody know the cause and how to deal with this.

Thanks!

P.S.
GDB is installed through "apt install gdb" in QEMU.
The systemd is not enabled because systemd will directly cause seg faults.