Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.bugs.dist > #990381

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.

Show all headers | View raw

Hi Benjamin,

On Wed, Jan 08, 2020 at 01:07:20PM +0100, Salvatore Bonaccorso wrote:
> 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?

So here is what I think is part of what is going on (unless there is
something broken in my analysis):

Since 898490c010b5 ("moduleparam: Save information about built-in
modules in separate file")[1] which is in 5.2-rc1, there is a new
modules.builtin.modinfo provided.

 [1]: <https://git.kernel.org/linus/898490c010b5d2e499e03b7e815fc214209ac583>

This one is installed in the -unsigned binary packages but not copied
over into the signing template, so the signed linux image packages do
not contain it.

Now with kmod/26+20191223-1 we have 60084cf1cb24 ("libkmod: Add parser
for modules.builtin.modinfo")[2] adding the parser and [3] and [4]
using that.

 [2]: <https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git/commit/?id=60084cf1cb24dc3a257976c0d539a4c3ffda5db5>
 [3]: <https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git/commit/?id=73eed2aba3cbe18bbda40f18f7bc32e8de1ec81f>
 [4]: <https://git.kernel.org/pub/scm/utils/kernel/kmod/kmod.git/commit/?id=b866b2165ae6cf18fb26b635f4a7ee57c0334731>

Salvatore

Back to linux.debian.bugs.dist | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

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

csiph-web