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+files: 0.843
+graphic: 0.817
+device: 0.727
+performance: 0.606
+semantic: 0.586
+ppc: 0.507
+network: 0.465
+hypervisor: 0.431
+vnc: 0.402
+debug: 0.382
+risc-v: 0.377
+peripherals: 0.344
+PID: 0.329
+user-level: 0.314
+kernel: 0.299
+VMM: 0.280
+i386: 0.272
+socket: 0.271
+x86: 0.269
+architecture: 0.268
+arm: 0.261
+KVM: 0.259
+TCG: 0.246
+boot: 0.209
+mistranslation: 0.171
+permissions: 0.171
+register: 0.170
+virtual: 0.152
+assembly: 0.086
+
+[7.2.0] Qemu process hang with `defunct` when using `-blockdev` json property which file doesn't exists
+Description of problem:
+When using `throttle` and `throttle-group` to apply block device QOS,  
+there is something wrong with check file exists validation.  
+In upper commands, if the file which located `/mnt/b3b8dfb5-0a7c-4285-81d8-2bf8d33a3297/32c55f5a-96d1-4af4-a149-c95fd6652e3e/b016af76-f6b1-4614-b29a-78917924e55e` doesn't exist, it just hang with `defunct` process.  
+![defunct](/uploads/607c81f0c5a490a50cd0882139fded4b/defunct.png)
+Steps to reproduce:
+1. Start Guest with upper command.
+2. Hanged with defunct process
+3.
+Additional information:
+![1682511478](/uploads/4c6ec5d32e71bf5c116ed146a27dc8a6/1682511478.png)  
+- With GDB stack, i can find `no such file` error, but process don't exit