[lttng-dev] Errors compiling converted tp file

[Thibault, Daniel]

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Date: Wed, 10 Dec 2014 16:16:06 +0100

> Thanks for that.  I have asked our sysadmin to install a newer version via this method. Even though he gets several severe-lloking errors in this process
>
> $ apt-get install liblttng-ust-dev
>
> Building initial module for 3.2.0-61-generic
> Errors were encountered while processing:
>  lttng-modules-dkms
>  Error!  Build of lttng-probe-printk.ko failed for: 3.2.0-61-generic (x86_64)
>
> In the make log, we find the following three lines:
>
> /var/lib/dkms/lttng-modules/2.5.x+stable+bzr633+pack21+201412020446~ubuntu12.04.1/build/probes/Makefile:30: File /usr/src/linux-headers-3.2.0-61-generic/virt/kvm/iodev.h not found. Probe "kvm" x86-specific is disabled. Use full kernel source tree to enable it.
> /var/lib/dkms/lttng-modules/2.5.x+stable+bzr633+pack21+201412020446~ubuntu12.04.1/build/probes/Makefile:142: Files /usr/src/linux-headers-3.2.0-61-generic/fs/btrfs/*.h not found. Probe "btrfs" is disabled. Use full kernel source tree to enable it.
> /var/lib/dkms/lttng-modules/2.5.x+stable+bzr633+pack21+201412020446~ubuntu12.04.1/build/probes/Makefile:158: Files /usr/src/linux-headers-3.2.0-61-generic/fs/ext4/*.h not found. Probe "ext4" is disabled. Use full kernel source tree to enable it.
>
> The full kernel source tree is already installed. 

   Those three errors are inconsequential; they simply mean your kernel does not support kvm nor the btrfs and ext4 file systems (a common occurrence).

> However it actually works to create a header file from a tp file and compile (and run) the code. However I now get in trouble when executing:
>
> $ lttng list --userspace
> Error: Unable to list UST events: Undefined command
> Error: Command error
>
> So I guess something still went somewhat wrong but I can't really see what.
>
> Yan Grange

   In order to trace user-space, you must install, in sequence, the following packages: userspace-rcu, lttng-ust, lttng-tools.  Was this done?

Daniel U. Thibault
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