On 2020-01-06 7:46 p.m., Benjamin Poirier wrote: > I'm not sure if it's related but I saw almost the same error on last > upgrade (but for 5.4.0-2): > > depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open > builtin file > '/var/tmp/mkinitramfs_J2sneW/lib/modules/5.4.0-2-amd64/modules.builtin.bin' > > and I now get: > > root@vsid:~# lttng list --kernel > Error: Unable to list kernel events: Kernel tracer not available > root@vsid:~# journalctl -u lttng-sessiond.service > [...] > Jan 07 09:33:20 vsid lttng-sessiond[403]: Error: Failed to load kmod library > resources > Jan 07 09:33:20 vsid lttng-sessiond[403]: Warning: No kernel tracer available > > lttng-modules-dkms is installed. I can load the modules manually but I > still get the same error. >
Hi, If you had just installed the lttng-modules-dkms and lttng-tools packages, it's possible that the lttng-sessiond deamon was started before the kernel modules were built and so it couldn't load them. Simply restarting the sessiond should fix this. Cheers, Michael
