modprobe: ERROR: could not insert 'ipv6': Exec format error / module ipv6: Unknown relocation: 72

Second resend. Not sure why e-mail from my Gentoo account and private account never arrive. Originally sent on 21 May 2019, but I still see this issue in 5.2.0-rc3-JeR-00077-g16d72dd4891f. I attached the kernel config in earlier attempts but I am leaving that out this time.

<Forwarded message:>

# modprobe -v ipv6
insmod /lib/modules/5.2.0-rc1-JeR/kernel/net/ipv6/ipv6.ko
modprobe: ERROR: could not insert 'ipv6': Exec format error

dmesg:
module ipv6: Unknown relocation: 72

# modprobe -v nf_conntrack
insmod /lib/modules/5.2.0-rc1-JeR/kernel/net/netfilter/nf_conntrack.ko
modprobe: ERROR: could not insert 'nf_conntrack': Exec format error

dmesg:
module nf_conntrack: Unknown relocation: 72

Note that other modules are loaded properly. Any ideas?

Kind regards,
jer

--
System information:

Linux karsten 5.2.0-rc1-JeR #60 SMP Mon May 20 09:34:40 CEST 2019 parisc64 PA8800 (Mako) 9000/785/C8000 GNU/Linux

Linux version 5.2.0-rc1-JeR (root@karsten) (gcc version 8.3.0 (Gentoo 8.3.0 p1.0)) #60 SMP Mon May 20 09:34:40 CEST 2019

at commit commit a188339ca5a396acc588e5851ed7e19f66b0ebd9 (HEAD, tag:
v5.2-rc1, origin/master, origin/HEAD, master)

 # hppa64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=hppa64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/hppa64-unknown-linux-gnu/8.3.0/lto-wrapper
Target: hppa64-unknown-linux-gnu
Configured
 with: /var/tmp/portage/sys-devel/kgcc64-8.3.0/work/gcc-8.3.0/configure
 --host=hppa2.0-unknown-linux-gnu --target=hppa64-unknown-linux-gnu
 --build=hppa2.0-unknown-linux-gnu --prefix=/usr
 --bindir=/usr/hppa2.0-unknown-linux-gnu/hppa64-unknown-linux-gnu/gcc-bin/8.3.0
 --includedir=/usr/lib/gcc/hppa64-unknown-linux-gnu/8.3.0/include
 --datadir=/usr/share/gcc-data/hppa64-unknown-linux-gnu/8.3.0
 --mandir=/usr/share/gcc-data/hppa64-unknown-linux-gnu/8.3.0/man
 --infodir=/usr/share/gcc-data/hppa64-unknown-linux-gnu/8.3.0/info
 --with-gxx-include-dir=/usr/lib/gcc/hppa64-unknown-linux-gnu/8.3.0/include/g++-v8
 --with-python-dir=/share/gcc-data/hppa64-unknown-linux-gnu/8.3.0/python
 --enable-languages=c --enable-obsolete --enable-secureplt
 --disable-werror --with-system-zlib --enable-nls
 --without-included-gettext --with-bugurl=https://bugs.gentoo.org/
 --with-pkgversion='Gentoo 8.3.0 p1.0' --disable-libstdcxx-pch
 --enable-poison-system-directories --disable-shared
 --disable-libatomic --disable-threads --without-headers
 --disable-bootstrap --enable-__cxa_atexit --enable-clocale=gnu
 --disable-multilib --disable-libgomp --disable-libmudflap
 --disable-libssp --disable-libquadmath --enable-lto --without-cloog
 --without-ppl Thread model: single gcc version 8.3.0 (Gentoo 8.3.0
 p1.0)

# hppa64-unknown-linux-gnu-ld -v
GNU ld (Gentoo 2.31.1 p5) 2.31.1

You could try attached untested patch.
I still wonder why you get R_PARISC_PCREL64 relocations. Can you send your .config ?

Helge

index eab964a8bf4b..ac5f34993b53 100644
@@ -780,6 +780,10 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
 			/* 32-bit PC relative address */
 			*loc = val - dot - 8 + addend;
 			break;
+		case R_PARISC_PCREL64:
+			/* 64-bit PC relative address */
+			*loc64 = val - dot - 8 + addend;
+			break;
 		case R_PARISC_DIR64:
 			/* 64-bit effective address */
 			*loc64 = val + addend;

I will.

I have uploaded it here: https://dev.gentoo.org/~jer/c8000.config

Regards,
jer

-> https://dev.gentoo.org/~jer/c8000.config

Thanks!

The R_PARISC_PCREL64 relocations are in the __jump_table section, so they were introduced by this commit:
parisc: Add static branch and JUMP_LABEL feature
See:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=62217beb394e654bbd2bb87c533dadd2d8bf62c6

Jeroen, I think the last patch I sent to you should help...

Helge

It does!

jer

Commit 62217beb394e ("parisc: Add static branch and JUMP_LABEL feature") missed to add code to handle PCREL64 relocations which are generated when creating a jump label on a 64-bit kernel.

This patch fixes module load errors like this one:

# modprobe -v ipv6
insmod /lib/modules/5.2.0-rc1-JeR/kernel/net/ipv6/ipv6.ko
modprobe: ERROR: could not insert 'ipv6': Exec format error
dmesg reports:
module ipv6: Unknown relocation: 72

index f241ded9239b..1f0f29a289d3 100644
@@ -786,6 +786,10 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
 			/* 32-bit PC relative address */
 			*loc = val - dot - 8 + addend;
 			break;
+		case R_PARISC_PCREL64:
+			/* 64-bit PC relative address */
+			*loc64 = val - dot - 8 + addend;
+			break;
 		case R_PARISC_DIR64:
 			/* 64-bit effective address */
 			*loc64 = val + addend;

Relocation 72 is R_PARISC_PCREL64. It would be created in assembler using something like:

.dword symbol-.

You could find how it's created by looking at assembler for nf_conntrack.

Dave

John David Anglin  [email protected]