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+graphic: 0.734
+device: 0.725
+files: 0.687
+risc-v: 0.648
+register: 0.512
+debug: 0.503
+architecture: 0.492
+permissions: 0.483
+semantic: 0.472
+performance: 0.452
+network: 0.448
+vnc: 0.436
+socket: 0.412
+PID: 0.336
+arm: 0.322
+boot: 0.320
+ppc: 0.318
+mistranslation: 0.309
+virtual: 0.296
+i386: 0.295
+peripherals: 0.246
+TCG: 0.214
+VMM: 0.199
+x86: 0.195
+user-level: 0.194
+kernel: 0.184
+hypervisor: 0.164
+KVM: 0.084
+assembly: 0.052
+
+The cause code of a trap changes when qemu is nested in another qemu
+Description of problem:
+I am studying the feasibility of doing some practical work on RISCV plates. Since I don't have these boards yet, I'm emulating it with qemu. The practice in turn consists of launching with qemu a very small operating system with two tasks that make a series of system calls.
+
+When I run this practice on my host it works correctly, but when I run it on an Ubuntu emulated in riscv with qemu, the cause code for the trap changes (the first bit of the code).
+
+The demo can be found in this repository: https://github.com/Sft570/qemu-bug-report
+Steps to reproduce:
+1. Clone the repository on the host and run the demo with "make qemu"
+2. Emulate with qemu ubuntu in riscv, clone the repository and run the demo with "make qemu".
+
+The error displayed shows the change of the cause code bit. You can analyze its behavior in the trap.c file in the src folder.
+Additional information:
+