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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Sun, Feb 05, 2017 at 10:18:35AM +0530, Charles wrote:
> 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: =========
> /lib/x86_64-linux-gnu/libc.so.6(+0x75bb6)[0x7f2b30ee4bb6]
> /lib/x86_64-linux-gnu/libc.so.6(cfree+0x6c)[0x7f2b30ee995c]
> /lib/x86_64-linux-gnu/libc.so.6(fclose+0x14d)[0x7f2b30ed5afd]
> /usr/lib/xen-4.1/bin/../lib/libxenlight.so(libxl_userdata_store+0x113)[0x7f2b3183f9a3]

This already points to one libxl function, so it would be easy to track
down the double free from there.

Wei.

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