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[Xen-users] How to investigate xl double free or corruption?

Hello xen-users :-)

How to investigate xl double free or corruption?

After rebooting a Debian 7 server with Xen 4.1 tools, one DomU had not autostarted.

Tried to start it manually:

root@<redacted>:/etc/xen# xl create <redacted>.cfg
Parsing config file <redacted>.cfg
*** glibc detected *** /usr/lib/xen-4.1/bin/xl: double free or corruption (!prev): 0x0000000001649010 ***
======= Backtrace: =========
======= Memory map: ========

The full trace and the .cfg file are at http://pastebin.com/QGXGPcY1

I do not suspect xl itself or the libraries it uses because it (auto)started eight DomUs.

Equally I do not suspect the .cfg file because it:
* has not been changed since Feb 2016
* looks normal
* was used by manual xl create in Dec 2016
* has no features which some or all the other .cfg files do not have

How to investigate this unwanted behaviour?



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