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Qemu PPC64 freezes with multi-core CPU
I installed Debian 10 on a Qemu PPC64 VM running with the following flags:
qemu-system-ppc64 \
-nographic -nodefaults -monitor pty -serial stdio \
-M pseries -cpu POWER9 -smp cores=4,threads=1 -m 4G \
-drive file=debian-ppc64el-qemu.qcow2,format=qcow2,if=virtio \
-netdev user,id=network01,$ports -device rtl8139,netdev=network01 \
Within a couple minutes on any operation (could be a Go application or simply changing the hostname with hostnamectl, the VM freezes and prints this on the console:
```
root@debian:~# [ 950.428255] rcu: INFO: rcu_sched self-detected stall on CPU
[ 950.428453] rcu: 3-....: (5318 ticks this GP) idle=8e2/1/0x4000000000000004 softirq=5957/5960 fqs=2544
[ 976.244481] watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [zsh:462]
Message from syslogd@debian at Mar 17 11:35:24 ...
kernel:[ 976.244481] watchdog: BUG: soft lockup - CPU#3 stuck for 23s! [zsh:462]
[ 980.110018] rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks: { 3-... } 5276 jiffies s: 93 root: 0x8/.
[ 980.111177] rcu: blocking rcu_node structures:
[ 1013.442268] rcu: INFO: rcu_sched self-detected stall on CPU
[ 1013.442365] rcu: 3-....: (21071 ticks this GP) idle=8e2/1/0x4000000000000004 softirq=5957/5960 fqs=9342
```
If I change to 1 core on the command line, I haven't seen these freezes.
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