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Tiny Linux distro that runs the entire OS as Docker containers
https://rancher.com/docs/os/v1.x/en/
Apache License 2.0
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Launch Custom Module #2426

Closed dduquesne closed 6 years ago

dduquesne commented 6 years ago

1.3

baremetal

Hello,

I would like to build/install a kernel module. I tried to follow these links :+1: https://rancher.com/docs/os/v1.2/en/configuration/loading-kernel-modules/ & https://rancher.com/docs/os/v1.0/en/configuration/loading-kernel-modules/

I enabled the linux headers service from system-docker.

I tried to launch a container with the command below. I also tried with the ZFS image : sudo system-docker run --privileged -it --rm --name dkms-install -v /usr/src:/usr/src -v /lib/modules:/lib/modules --entrypoint /bin/bash ubuntu '

Into the container, i run the commands below : apt-get update -y apt-get install -y software-properties-common apt-add-repository -y ppa:lttng/stable-2.10 apt-get install -y lttng-tools apt-get install -y lttng-modules-dkms apt-get install -y liblttng-ust-dev

After that, i tried to use modprobe to load the module but the kernel does not see any of my new modules. I tried to use them folowing the manual but nothing (https://lttng.org/docs/v2.10/#doc-ubuntu) :

lttng create my-kernel-session --output=/tmp/my-kernel-trace lttng list --kernel lttng list --kernel --syscall

What could be wrong ? Maybe it's obvious but i spent my day on it without any success. Any help is welcome :)

Thanks !

Jason-ZW commented 6 years ago

@dduquesne I can successfully launch custom module lttng-trace on rancheros-v1.4 You can follow these steps:

prepare. swtich console to ubuntu (just because I like ubuntu):

sudo ros console switch ubuntu

step1. load kernel-headers:

$ sudo ros service enable kernel-headers
$ sudo ros service up kernel-headers

step2. launch container using kernel-headers:

$ docker run -it --rm --name dkms-install -v /usr/src:/usr/src -v /lib/modules:/lib/modules ubuntu bash

step3. execute follow command in dkms-install container:

$ apt-get update && apt-get install -y git build-essential libelf-dev module-init-tools
# clone and build lttng-modules source
$ git clone https://github.com/lttng/lttng-modules.git
$ cd lttng-modules
# just ignore errors such like (/lttng-modules/probes/Kbuild:50: etc...)
$ make  
# just ignore erros such like (SSL error:02001002: etc...)
$ make modules_install
$ depmod -a
$ exit

step4. loading kernel modules:

$ sudo ros config set rancher.modules "['lttng-tracer']"

step5. reboot rancheros:

$ reboot

step6. check lttng-modules were loaded:

$ lsmod | grep lttng
# output
lttng_tracer         1601536  0
lttng_statedump        40960  1 lttng_tracer
lttng_kprobes          16384  1 lttng_tracer
lttng_clock            16384  1 lttng_tracer
lttng_lib_ring_buffer    57344  1 lttng_tracer
lttng_kretprobes       16384  1 lttng_tracer

step7. install lttng-tools:

$ apt-get update && apt-get install -y lttng-tools

step8. try lttng-tools command works:

$ lttng create my-kernel-session --output=/tmp/my-kernel-trace
# output
Spawning a session daemon
Session my-kernel-session created.
Traces will be written in /tmp/my-kernel-trace

$ lttng list --kernel
# output
Kernel events:
-------------
      lttng_logger (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_bias_level_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_bias_level_done (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_done (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_widget_power (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_widget_event_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_widget_event_done (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_walk_done (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_path (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_dapm_connected (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_jack_irq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_jack_report (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      asoc_snd_soc_jack_notify (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_touch_buffer (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_dirty_buffer (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_rq_requeue (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_rq_complete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_rq_insert (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_rq_issue (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_bio_bounce (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_bio_complete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_bio_backmerge (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_bio_frontmerge (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_bio_queue (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_getrq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_sleeprq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_plug (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_unplug (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_split (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_bio_remap (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      block_rq_remap (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      compaction_isolate_migratepages (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      compaction_isolate_freepages (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      compaction_migratepages (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      gpio_direction (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      gpio_value (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      irq_handler_entry (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      irq_handler_exit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      irq_softirq_entry (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      irq_softirq_exit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      irq_softirq_raise (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_checkpoint (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_start_commit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_commit_locking (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_commit_flushing (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_commit_logging (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_drop_transaction (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_end_commit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_submit_inode_data (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_run_stats (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_checkpoint_stats (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_update_log_tail (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      jbd2_write_superblock (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_kmalloc (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_cache_alloc (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_kmalloc_node (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_cache_alloc_node (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_kfree (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_cache_free (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_mm_page_free (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_mm_page_free_batched (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_mm_page_alloc (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_mm_page_alloc_zone_locked (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_mm_page_pcpu_drain (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kmem_mm_page_alloc_extfrag (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_userspace_exit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_set_irq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_ioapic_set_irq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_msi_set_irq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_ack_irq (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_mmio (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_fpu (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_age_page (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_try_async_get_page (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_async_pf_doublefault (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_async_pf_not_present (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_async_pf_ready (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      kvm_async_pf_completed (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      module_load (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      module_free (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      module_get (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      module_put (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      module_request (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      napi_poll (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      net_dev_xmit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      net_dev_queue (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      net_if_receive_skb (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      net_if_rx (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_cpu_idle (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_cpu_frequency (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_machine_suspend (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_wakeup_source_activate (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_wakeup_source_deactivate (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_clock_enable (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_clock_disable (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_clock_set_rate (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      power_domain_target (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      printk_console (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      random_mix_pool_bytes (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      random_mix_pool_bytes_nolock (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      random_credit_entropy_bits (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      random_get_random_bytes (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      random_extract_entropy (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      random_extract_entropy_user (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rcu_utilization (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_enable (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_enable_delay (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_enable_complete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_disable (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_disable_complete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_set_voltage (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      regulator_set_voltage_complete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_kthread_stop (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_kthread_stop_ret (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_waking (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_wakeup (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_wakeup_new (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_switch (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_migrate_task (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_process_free (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_process_exit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_wait_task (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_process_wait (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_process_fork (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_process_exec (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_stat_wait (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_stat_sleep (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_stat_iowait (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_stat_blocked (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_stat_runtime (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sched_pi_setprio (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      scsi_dispatch_cmd_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      scsi_dispatch_cmd_error (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      scsi_dispatch_cmd_done (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      scsi_dispatch_cmd_timeout (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      scsi_eh_wakeup (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      signal_generate (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      signal_deliver (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      skb_kfree (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      skb_consume (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      skb_copy_datagram_iovec (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sock_rcvqueue_full (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      sock_exceed_buf_limit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_end (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_process_state (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_file_descriptor (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_vm_map (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_network_interface (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_block_device (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      lttng_statedump_interrupt (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_call_status (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_bind_status (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_connect_status (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_task_begin (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_task_run_action (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_task_complete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_task_sleep (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      rpc_task_wakeup (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_init (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_expire_entry (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_expire_exit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_cancel (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_hrtimer_init (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_hrtimer_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_hrtimer_expire_entry (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_hrtimer_expire_exit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_hrtimer_cancel (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_itimer_state (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      timer_itimer_expire (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      udp_fail_queue_rcv_skb (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_kswapd_sleep (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_kswapd_wake (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_wakeup_kswapd (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_direct_reclaim_begin (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_memcg_reclaim_begin (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_memcg_softlimit_reclaim_begin (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_direct_reclaim_end (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_memcg_reclaim_end (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_memcg_softlimit_reclaim_end (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_shrink_slab_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_shrink_slab_end (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_lru_isolate (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_writepage (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      mm_vmscan_lru_shrink_inactive (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      v4l2_dqbuf (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      v4l2_qbuf (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      workqueue_queue_work (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      workqueue_activate_work (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      workqueue_execute_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      workqueue_execute_end (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_dirty_page (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_dirty_inode_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_dirty_inode (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_mark_inode_dirty (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_write_inode_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_write_inode (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_nothread (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_queue (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_exec (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_written (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_wait (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_pages_written (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_bdi_register (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_nowork (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_wake_background (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_wake_thread (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_wake_forker_thread (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_bdi_unregister (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_thread_start (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_thread_stop (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_wbc_writepage (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_queue_io (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_global_dirty_state (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_bdi_dirty_ratelimit (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_balance_dirty_pages (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_sb_inodes_requeue (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_congestion_wait (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_wait_iff_congested (loglevel: TRACE_EMERG (0)) (type: tracepoint)
      writeback_single_inode (loglevel: TRACE_EMERG (0)) (type: tracepoint)

Works Perfectly :)

dduquesne commented 6 years ago

@Jason-ZW

Many thanks for this step by step demonstration :) I tried but it does not work for me. Compilation and other command run as expected but the module is not loaded after reboot. I am using a custom kernel. So maybe i have an issue there. I will investigate more on this side. But if the headers were not valid, i assume that compilation would have not complete.

Jason-ZW commented 6 years ago

@dduquesne lttng-modules need these kernel parameters enabled. You can check whether these parameters enabled or not:

$ zcat /proc/config.gz

CONFIG_MODULES
CONFIG_KALLSYMS
CONFIG_HIGH_RES_TIMERS 
CONFIG_TRACEPOINTS

After reboot please verify the lttng*.ko exist:

$ lsmod | grep lttng

$ find /lib*/modules/$(uname -r) -name *.ko | grep lttng