Difference between revisions of "Debugging"
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If CRIU crashes it's useful to build it with debug info and look into core file. | If CRIU crashes it's useful to build it with debug info and look into core file. | ||
| + | |||
| + | * build CRIU with debug info <code>make DEBUG=1</code> | ||
| + | * setup core file generation which depends on distro settings, usually the core generation template is sitting in /proc/sys/kernel/core_pattern, see more details at [http://man7.org/linux/man-pages/man5/core.5.html core.5] | ||
| + | |||
| + | Then upload core file into debugger <code>gdb criu core-file</code> and type <code>bt</code> command to fetch a backtrace. | ||
== Docker C/R == | == Docker C/R == | ||
| − | Docker keeps images in | + | Docker keeps images in and logs in <code>/var/lib/docker/containers//checkpoints/chp_/criu.work/</code> |
| + | |||
| + | == Tracing == | ||
| + | |||
| + | CRIU uses ptrace(), so strace can't be used in some cases. perf trace is an alternative way. It isn't so informative, but it is still better than nothing. | ||
| + | |||
| + | == Images == | ||
| + | |||
| + | The [[CRIT]] tool can help to decode [[images]] into a human readable format. | ||
[[Category:Using]] | [[Category:Using]] | ||
[[Category:Development]] | [[Category:Development]] | ||
[[Category:HOWTO]] | [[Category:HOWTO]] | ||
Latest revision as of 09:48, 16 February 2017
Raise verbosity[edit]
Make sure you use the -v4 option for extended logging and find logs in the work/images directories.
Getting core files[edit]
If CRIU crashes it's useful to build it with debug info and look into core file.
- build CRIU with debug info
make DEBUG=1 - setup core file generation which depends on distro settings, usually the core generation template is sitting in /proc/sys/kernel/core_pattern, see more details at core.5
Then upload core file into debugger gdb criu core-file and type bt command to fetch a backtrace.
Docker C/R[edit]
Docker keeps images in and logs in /var/lib/docker/containers//checkpoints/chp_/criu.work/
Tracing[edit]
CRIU uses ptrace(), so strace can't be used in some cases. perf trace is an alternative way. It isn't so informative, but it is still better than nothing.
Images[edit]
The CRIT tool can help to decode images into a human readable format.