libkmod2.0-udeb is not linked with pthreads

[Dimitri John Ledkov]

libkmod2.0-udeb is not linked with pthreads

When running udevadm in d-i the following happens:

udevadm: Relink `/lib/libkmod.so.2' with `/lib/libpthread.so.0' for IFUNC symbol `system'

Maybe libkmod2.0 needs a rebuild and/or fix up?

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[lplewa (lplewa)]

This issue affects the PMDK project - https://github.com/pmem/issues/issues/806

Minimal reproduction:
$ cat test.c
#include <libkmod.h>

int foo() {
 kmod_ref((void *)0);
 return 0;
}
cat main.c
void foo (void);
int main () {
 foo();
 return 0;
}
$ gcc -fPIC -c -o test.o test.c
$ gcc -shared -fPIC -o libfoo.so test.o -lc -lkmod
$ gcc -L. -o main.o main.c -lfoo -pthread
$ LD_LIBRARY_PATH=. ./main.o
./main.o: Relink `/lib/x86_64-linux-gnu/libkmod.so.2' with `/lib/x86_64-linux-gnu/libpthread.so.0' for IFUNC symbol `system'

[Andreas Hasenack (ahasenack)]

Thanks for the reproducer.

I cannot reproduce this on Bionic 18.04, however:

andreas@nsnx:~/x$ cat test.c
#include <libkmod.h>

int foo() {
 kmod_ref((void *)0);
 return 0;
}
andreas@nsnx:~/x$ cat main.c
void foo (void);
int main () {
 foo();
 return 0;
}
andreas@nsnx:~/x$ gcc -fPIC -c -o test.o test.c
andreas@nsnx:~/x$ gcc -shared -fPIC -o libfoo.so test.o -lc -lkmod
andreas@nsnx:~/x$ gcc -L. -o main.o main.c -lfoo -pthread
andreas@nsnx:~/x$ LD_LIBRARY_PATH=. ./main.o
andreas@nsnx:~/x$ l
total 72K
drwxr-xr-x 2 andreas andreas 7 abr 25 10:05 .
drwx-----x 78 andreas andreas 157 abr 25 10:04 ..
-rwxr-xr-x 1 andreas andreas 7,7K abr 25 10:05 libfoo.so
-rw-r--r-- 1 andreas andreas 52 abr 25 10:04 main.c
-rwxr-xr-x 1 andreas andreas 8,1K abr 25 10:05 main.o
-rw-r--r-- 1 andreas andreas 69 abr 25 10:03 test.c
-rw-r--r-- 1 andreas andreas 1,4K abr 25 10:05 test.o

Could you please verify on your end that it works in 18.04?

[Andreas Hasenack (ahasenack)]

Oh, wait, did you say udeb?

I tried with a normal deb:
ii libkmod2:amd64 24-1ubuntu3 amd64 libkmod shared library

[lplewa (lplewa)]

I didn't notice that this bug is about udeb package. We are using ubuntu 17.10, and normal "deb" kmod.
$ dpkg -l | grep kmod
ii kmod 24-1ubuntu2 amd64 tools for managing Linux kernel modules
ii libkmod-dev:amd64 24-1ubuntu2 amd64 libkmod development files
ii libkmod2:amd64 24-1ubuntu2 amd64 libkmod shared library

[Andreas Hasenack (ahasenack)]

17.10 is going to be EOL soon (july 2018, see https://wiki.ubuntu.com/), do you really need this on that platform? 18.04 is going to be released tomorrow and is our next LTS version.

[lplewa (lplewa)]

in this case we will switch to 18.04 when it will be released.

Thanks for your support.

[Andreas Hasenack (ahasenack)]

Thanks. I will mark this bug as fix released then since it's working in 18.04, due out tomorrow.