[lttng-dev] lttng-tools-2.10.6: Spawning consumerd failed

[veredz72@gmail.com (Zvi Vered)]

Hi Jonathan,

I had to run:
export LTTNG_CONSUMERD32_BIN=/lib/lttng/libexec/lttng-consumerd

Thank you very much !
Zvika

On Fri, May 17, 2019 at 10:48 PM Jonathan Rajotte-Julien <
jonathan.rajotte-julien at efficios.com> wrote:

> Hi,
>
> You forgot to cc the mailing list. Adding it.
>
> On Fri, May 17, 2019 at 04:50:02AM +0300, Zvi Vered wrote:
> > Hi Janathan, All,
> >
> > I solved the path issue with
> >
> > export LTTNG_CONSUMERD32_BIN=/lib/lttng/libexec
> > export LTTNG_CONSUMERD32_LIBDIR =/lib
> > export LTTNG_SESSION_CONFIG_XSD_PATH=/share/lttng/...
>
> This is a way to solve it, I would still recommend you fix it at the source
> (proper cross build).
>
> ...
>
> > ....
> > DEBUG3 - 00:13:48.436226116 [1980/1980]: Looking for a kernel consumer at
> > these locations: (in spawn_consumerd() at main.c:2429)
> > DEBUG3 - 00:13:48.436252139 [1980/1980]:        1) NULL (in
> > spawn_consumerd() at main.c:2430)
> > DEBUG3 - 00:13:48.436256414 [1980/1980]:        2)
> >
> /64_sw/git/zvi_vered/MY_PROJ/linux4.9.20/boot/rootfs/lib/lttng/libexec/lttng-consumerd
> > (in spawn_consumerd() at main.c:2431)
> > DEBUG3 - 00:13:48.436260543 [1980/1980]:        3) /lib/lttng/libexec (in
> > spawn_consumerd() at main.c:2432)
> > DEBUG3 - 00:13:48.436313492 [1980/1980]: Found location #3 (in
> > spawn_consumerd() at main.c:2441)
> > DEBUG1 - 00:13:48.436319027 [1980/1980]: Using kernel consumer at:
> > /lib/lttng/libexec (in spawn_consumerd() at main.c:2448)
> > PERROR - 00:13:48.436341261 [1980/1980]: Consumer execl(): Permission
> > denied (in spawn_consumerd() at main.c:2539)
>
> We found the consumerd in /lib/lttng/libexec/lttng-consumerd. Good.
>
> We now try to execl the following:
>
> /lib/lttng/libexec/lttng-consumerd -k --consumerd-cmd-sock <a_path>
> --consumerd-error-sock <b_path> --group root
>
> And execl returns "Permission Denied".
>
> Clearly, /lib/lttng/libexec/lttng-consumerd have some permissions problem.
>
> "Permission denied" is linked to EACCES on my system.
>   asm-generic/errno-base.h
>   17:#define    EACCES          13     /* Permission denied */
>
> "man execve" list all the reasons why execl might return EACCES per "man
> execl":
>
>   EACCES Search permission is denied on a component of the path prefix of
> filename or the name of a script interpreter.  (See also
> path_resolution(7).)
>   EACCES The file or a script interpreter is not a regular file.
>   EACCES Execute permission is denied for the file or a script or ELF
> interpreter.
>   EACCES The filesystem is mounted noexec.
>
> One of them probably fit your current scenario.
>
> Let us know how it goes.
>
> Cheers
>
> --
> Jonathan Rajotte-Julien
> EfficiOS
>
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