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+
+The thread of "CPU 0 /KVM" keeping 99.9%CPU
+
+Hi Expert:
+
+The VM is hung here after (2, or 3, or 5 and the longest time is 10 hours) by qemu-kvm.
+Notes: 
+for VM:
+  OS: RHEL 7.6
+  CPU: 1
+  MEM:4G
+For qemu-kvm:
+  1) version:
+     /usr/libexec/qemu-kvm -version
+     QEMU emulator version 2.10.0(qemu-kvm-ev-2.10.0-21.el7_5.4.1)
+  2) once the issue is occurred, the CPU of "CPU0 /KVM" is more than 99% by com "top -p VM_pro_ID"
+    PID  UDER   PR NI RES   S  % CPU %MEM  TIME+    COMMAND
+872067   qemu   20 0  1.6g  R   99.9  0.6  37:08.87 CPU 0/KVM
+  3) use "pstack 493307" and below is function trace
+Thread 1 (Thread 0x7f2572e73040 (LWP 872067)):
+#0  0x00007f256cad8fcf in ppoll () from /lib64/libc.so.6
+#1  0x000055ff34bdf4a9 in qemu_poll_ns ()
+#2  0x000055ff34be02a8 in main_loop_wait ()
+#3  0x000055ff348bfb1a in main ()
+  4) use strace "strace -tt -ff -p 872067 -o cfx" and below log keep printing
+21:24:02.977833 ppoll([{fd=4, events=POLLIN}, {fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=80, events=POLLIN}, {fd=82, events=POLLIN}, {fd=84, events=POLLIN}, {fd=115, events=POLLIN}, {fd=121, events=POLLIN}], 9, {0, 0}, NULL, 8) = 0 (Timeout)
+21:24:02.977918 ppoll([{fd=4, events=POLLIN}, {fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=80, events=POLLIN}, {fd=82, events=POLLIN}, {fd=84, events=POLLIN}, {fd=115, events=POLLIN}, {fd=121, events=POLLIN}], 9, {0, 911447}, NULL, 8) = 0 (Timeout)
+21:24:02.978945 ppoll([{fd=4, events=POLLIN}, {fd=6, events=POLLIN}, {fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=80, events=POLLIN}, {fd=82, events=POLLIN}, {fd=84, events=POLLIN}, {fd=115, events=POLLIN}, {fd=121, events=POLLIN}], 9, {0, 0}, NULL, 8) = 0 (Timeout)
+Therefore, I think the thread "CPU 0/KVM" is in tight loop.
+  5) use reset can recover this issue. however, it will reoccurred again.
+Current work around is increase one CPU for this VM, then issue is gone.
+
+thanks
+Cliff
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