| # ext4 deadlock issue | |
| ## 0. Background | |
| This gist repo is about an ext4 deadlock issue which may be happened when OOM | |
| killer is triggered on CentOS 7 with version after 3.10.0-862.el7. | |
| See https://bugzilla.redhat.com/show_bug.cgi?id=1911392 for more details. | |
| ## 1. How to reproduce this issue? |
| # disable power saving on CentOS 7 | |
| grep -E '^model name|^cpu MHz' /proc/cpuinfo | |
| pgrep -lf ondemand | |
| cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor | |
| for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor; do [ -f $CPUFREQ ] || continue; echo -n performance > $CPUFREQ; done | |
| service cpuspeed stop | |
| lsmod | grep ondemand | |
| grep -E '^model name|^cpu MHz' /proc/cpuinfo |
DB
ovs-vsctl list open_vswitch
ovs-vsctl list interface
ovs-vsctl list interface vxlan-ac000344
ovs-vsctl --columns=options list interface vxlan-ac000344
ovs-vsctl --columns=ofport,name list Interface
ovs-vsctl --columns=ofport,name --format=table list Interface
ovs-vsctl -f csv --no-heading --columns=_uuid list controller
ovs-vsctl -f csv --no-heading -d bare --columns=other_config list port