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Bug #1173

Updated by Jonathan Rajotte Julien over 5 years ago

 
 hardware: i.mx6 quad (Arm v7) 

 components used: 

 poky/branch: https://github.com/RobertBerger/poky/tree/2019-01-16-thud-2.6.1-pre-release 

 layer, which adds 4.19.13 kernel + new lttng components: 

 https://github.com/RobertBerger/meta-mainline/tree/thud-training-v4.19.x/multi-v7-ml 

 kernel: 
 <pre> 
 

 target# uname -a 
 Linux multi-v7-ml 4.19.13-custom-ml-debug #1 SMP Wed Jan 16 20:05:50 UTC 2019 armv7l armv7l armv7l GNU/Linux 
 </pre> 
 <pre> 
 

 target# gcc --version 
 gcc (GCC) 8.2.0 
 Copyright (C) 2018 Free Software Foundation, Inc. 
 This is free software; see the source for copying conditions.    There is NO 
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
 </pre> 
 <pre> 
 

 host# bitbake-layers show-recipes | grep -A1 lttng 
 lttng-modules: 
   multi-v7-ml            2.10.8 
 -- 
 lttng-tools: 
   multi-v7-ml            2.10.5 
 -- 
 lttng-ust: 
   multi-v7-ml            2:2.10.2 
 </pre> 

 -------------------------------------- 
 Session on serial console (so we can see kernel complaints as well) on target: 
 <pre> 
 

 root@multi-v7-ml:/# export SESSION="test_session" 
 root@multi-v7-ml:/# lttng create ${SESSION} 
 Spawning a session daemon 
 [     81.444493] lttng_kretprobes: loading out-of-tree module taints kernel. 
 [     81.451767] lttng_kretprobes: section 4 reloc 5 sym 'strlen': relocation 28 out of range (0xbf0700a0 -> 0xc10a761c) 
 Session test_session created. 
 Traces will be written in /home/root/lttng-traces/test_session-20190122-114319 
 root@multi-v7-ml:/# lsmod 
 Module                    Size    Used by 
 rtc_da9063               16384    0 
 da9062_core              16384    0 
 rtc_snvs                 16384    1 
 root@multi-v7-ml:/# lttng list 
 Available tracing sessions: 
   1) test_session (/home/root/lttng-traces/test_session-20190122-114319) [inactive] 
     Trace path: /home/root/lttng-traces/test_session-20190122-114319 


 Use lttng list <session_name> for more details 
 root@multi-v7-ml:/# lttng enable-event --kernel sched_switch,sched_process_fork 
 [    150.804796] lttng_kretprobes: section 4 reloc 5 sym 'strlen': relocation 28 out of range (0xbf0770a0 -> 0xc10a761c) 
 Error: Event sched_switch: Kernel tracer not available (channel channel0, session test_session) 
 [    150.971757] lttng_kretprobes: section 4 reloc 5 sym 'strlen': relocation 28 out of range (0xbf07e0a0 -> 0xc10a761c) 
 Error: Event sched_process_fork: Kernel tracer not available (channel channel0, session test_session) 

 </pre> 

 


 Kernel tracer nor available - so I guess there is no point to try more stuff here. 

 What would you suggest? 

 <pre> 
 


 root@multi-v7-ml:/# lttng list ${SESSION} 
 Tracing session test_session: [inactive] 
     Trace path: /home/root/lttng-traces/test_session-20190122-114319 

 root@multi-v7-ml:/# lttng start 
 Error: No channel found in the session 
 </pre> 

 Am I doing something wrong or do I need some kernel/lttng_modules fixes? 

 BTW I tried first with whatever comes with my Yocto 2.6.1 pre-release and then upgraded to the latest and greatest lttng I could find on openembedded-core (master). 





 

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