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Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_N1a1Mk/lib/modules/5.4.0-1-amd64/modules.builtin.bin'

Cross-posted to 2 groups.

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Hi Benjamin,

On Wed, Jan 08, 2020 at 09:24:30AM +0900, Benjamin Poirier wrote:
[...]
> Looks like the modules are built before lttng-sessiond is started:
> 	Setting up lttng-modules-dkms (2.11.0-2) ...
> 	Loading new lttng-modules-2.11.0 DKMS files...
> 	Building for 5.4.0-2-amd64
> 	Building initial module for 5.4.0-2-amd64
> 	Done.
> 
> 	lttng-lib-ring-buffer.ko:
> 	Running module version sanity check.
> 	 - Original module
> 	   - No original module exists within this kernel
> 	 - Installation
> 	   - Installing to /lib/modules/5.4.0-2-amd64/updates/dkms/
> 
> 	[...]
> 
> 	depmod...
> 
> 	DKMS: install completed.
> 	Setting up linux-headers-5.4.0-2-amd64 (5.4.8-1) ...
> 	/etc/kernel/header_postinst.d/dkms:
> 	dkms: running auto installation service for kernel 5.4.0-2-amd64:.
> 	Setting up sudo (1.8.29-1) ...
> 	Setting up babeltrace (1.5.7-2) ...
> 	Setting up liburcu6:amd64 (0.11.1-2) ...
> 	Setting up linux-headers-amd64 (5.4.8-1) ...
> 	Setting up liblttng-ctl0:amd64 (2.11.0-3) ...
> 	Setting up lttng-tools (2.11.0-3) ...
> 
> Still, it doesn't work.
> 
> > Simply restarting the sessiond should fix this.
> 
> I tried restarting lttng-sessiond or rebooting the machine but it was no
> help, lttng-sessiond always reports:
> 	Error: Failed to load kmod library resources
> 	Warning: No kernel tracer available
> 
> A quick look into the code shows that is:
> src/bin/lttng-sessiond/modprobe.c
> 	kmod_set_log_fn(*ctx, log_kmod, NULL);
> 	ret = kmod_load_resources(*ctx);
> 	if (ret < 0) {
> 		ERR("Failed to load kmod library resources");
> 		goto error;
> 	}
> 
> I didn't dig into libkmod, but I noticed (using opensnoop.bt) the
> following:
> 	8071   lttng-sessiond      2   0 /lib/modules/5.4.0-2-amd64/modules.dep.bin
> 	8071   lttng-sessiond      2   0 /lib/modules/5.4.0-2-amd64/modules.alias.bin
> 	8071   lttng-sessiond      2   0 /lib/modules/5.4.0-2-amd64/modules.symbols.bin
> 	8071   lttng-sessiond      2   0 /lib/modules/5.4.0-2-amd64/modules.builtin.alias.bin
> 
> On another machine which I haven't yet updated and where lttng still
> works, I see:
> 	193519 lttng-sessiond      2   0 /lib/modules/5.4.0-1-amd64/modules.dep.bin
> 	193519 lttng-sessiond      2   0 /lib/modules/5.4.0-1-amd64/modules.alias.bin
> 	193519 lttng-sessiond      2   0 /lib/modules/5.4.0-1-amd64/modules.symbols.bin
> 	193519 lttng-sessiond      2   0 /lib/modules/5.4.0-1-amd64/modules.builtin.bin
> 
> Not sure if /lib/modules/5.4.0-2-amd64/modules.builtin.alias.bin is
> relevant but it's an empty file...
> 
> After downgrading libkmod2 from
> 	Version: 26+20191223-1
> to
> 	Version: 26-3
> the issue with lttng is no longer apparent:
> 	root@vsid:/tmp# lttng list --kernel
> 	Kernel events:
> 	-------------
> 	      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)
> 	[...] 
> 

Should we track this in a separate bug from #948257?

Regards,
Salvatore

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Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_N1a1Mk/lib/modules/5.4.0-1-amd64/modules.builtin.bin' Benjamin Poirier <benjamin.poirier@gmail.com> - 2020-01-07 02:00 +0100
  Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_N1a1Mk/lib/modules/5.4.0-1-amd64/modules.builtin.bin' Benjamin Poirier <benjamin.poirier@gmail.com> - 2020-01-08 01:30 +0100
    Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_N1a1Mk/lib/modules/5.4.0-1-amd64/modules.builtin.bin' Salvatore Bonaccorso <carnil@debian.org> - 2020-01-08 13:10 +0100
      Bug#948257: depmod: ERROR: ../libkmod/libkmod.c:515 lookup_builtin_file() could not open builtin file '/var/tmp/mkinitramfs_N1a1Mk/lib/modules/5.4.0-1-amd64/modules.builtin.bin' Salvatore Bonaccorso <carnil@debian.org> - 2020-01-08 13:50 +0100
        Bug#948427: modules.builtin.modinfo not included in signed image packages Salvatore Bonaccorso <carnil@debian.org> - 2020-01-08 16:10 +0100

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