github: add issue template and small readme addition

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,32 @@
+The template below is mostly useful for bug reports and support questions.
+Feel free to remove anything which doesn't apply to you and add more information where it makes sense.
+
+# Required information
+
+ * Distribution:
+   * `cat /etc/os-release` or `cat /etc/lsb-release`
+ * LXCFS version:
+ * The output of
+   * `uname -a`
+   * `cat /proc/1/mounts`
+   * `ps aux | grep lxcfs`
+   * LXCFS logs
+
+# Issue description
+
+A brief description of what failed or what could be improved.
+
+If you have LXCFS crashing, please, collect a crash dump.
+
+# Steps to reproduce
+
+ 1. Step one
+ 2. Step two
+ 3. Step three
+
+# Information to attach
+
+ - [ ] any relevant kernel output (`dmesg`)
+ - [ ] LXCFS daemon output / logs
+ - [ ] LXCFS configuration (Which options were used to start a LXCFS daemon? `ps aux | grep lxcfs`)
+ - [ ] in case of crash, a core dump (please, read [how to collect a core dump](https://github.com/lxc/lxcfs?tab=readme-ov-file#core-dump))

README.md

@@ -98,7 +98,7 @@ lxc.kmsg = 0
 lxc.include = /usr/share/lxc/config/common.conf.d/00-lxcfs.conf
 ```
 
-## Using with Docker
+### Using with Docker
 
 ```
 docker run -it -m 256m --memory-swap 256m \
@@ -163,3 +163,29 @@ As a result, LXCFS had to make some compromise which go as follow:
    usage (100% full) is reported. This provides adequate reporting of
    the memory consumption while preventing applications from assuming more
    SWAP is available.
+
+## Issue reporting
+
+### Core dump
+
+In case of LXCFS crash, it can be extremely useful for us to have a core dump of the LXCFS process memory.
+
+1. Please, check `/var/crash` and `coredumpctl list` just in case if you already have an LXCFS core dump file
+2. If not, you can use the following way to collect it from your system:
+
+On the machine where you run LXCFS, execute as root:
+```
+# save an old core_pattern setting value:
+cat /proc/sys/kernel/core_pattern > /root/core_pattern.old_value.bak
+
+# set a new one to collect all core dumps:
+echo '|/bin/sh -c $@ -- eval exec gzip --fast > /var/crash/core-%e.%p.gz' > /proc/sys/kernel/core_pattern
+
+# wait for the next LXCFS crash and check
+ls -lah /var/crash
+
+# there should be a file with a name like "core-lxcfs.80581.gz". Please, upload it somewhere and share with us.
+
+# restore the old "core_pattern" value:
+cat /root/core_pattern.old_value.bak > /proc/sys/kernel/core_pattern
+```