Comment 3 for bug 1677126

Revision history for this message
Colin Ian King (colin-king) wrote :

sudo /usr/bin/lttng-sessiond -vvv shows us the cause:

DEBUG1 - 08:54:51.384370 [14445/14475]: Processing client command 14 (in process_client_msg() at main.c:2989)
modprobe: FATAL: Module lttng-tracer not found in directory /lib/modules/4.10.0-14-generic
Error: Unable to load required module lttng-tracer
DEBUG1 - 08:54:51.387309 [14445/14475]: Failed to open /proc/lttng (in init_kernel_tracer() at main.c:2721)
DEBUG1 - 08:54:51.390165 [14445/14475]: Modprobe removal successful lttng-kretprobes (in modprobe_remove_lttng() at modprobe.c:126)
DEBUG1 - 08:54:51.392860 [14445/14475]: Modprobe removal successful lttng-kprobes (in modprobe_remove_lttng() at modprobe.c:126)
DEBUG1 - 08:54:51.396010 [14445/14475]: Modprobe removal successful lttng-ftrace (in modprobe_remove_lttng() at modprobe.c:126)
DEBUG1 - 08:54:51.398841 [14445/14475]: Modprobe removal successful lttng-types (in modprobe_remove_lttng() at modprobe.c:126)
Error: Unable to remove module lttng-ring-buffer-metadata-mmap-client
Error: Unable to remove module lttng-ring-buffer-client-mmap-overwrite
Error: Unable to remove module lttng-ring-buffer-client-mmap-discard
Error: Unable to remove module lttng-ring-buffer-metadata-client
Error: Unable to remove module lttng-ring-buffer-client-overwrite
Error: Unable to remove module lttng-ring-buffer-client-discard
Error: Unable to remove module lttng-lib-ring-buffer
Error: Unable to remove module lttng-tracer
Warning: No kernel tracer available
DEBUG1 - 08:54:51.422146 [14445/14475]: Missing llm structure. Allocating one. (in process_client_msg() at main.c:4037)
DEBUG1 - 08:54:51.422168 [14445/14475]: Sending response (size: 16, retcode: Kernel tracer not available) (in thread_manage_clients() at main.c:4456)
DEBUG1 - 08:54:51.422197 [14445/14475]: Clean command context structure (in clean_command_ctx() at main.c:829)
DEBUG1 - 08:54:51.422206 [14445/14475]: Accepting client command ... (in thread_manage_clients() at main.c:4310)