Re: kldxref: /boot/kernel/kernel: no ELF relocation table found
Date: Mon, 02 Sep 2024 17:57:05 UTC
On 2 Sep 2024, at 11:54, Dennis Clarke <dclarke@blastwave.org> wrote:
>
>
> All:
>
> Ye ol "make installkernel" starts nicely but ends a little odd :
>
>
> e# make installkernel
> --------------------------------------------------------------
> >>> Install check kernel
> --------------------------------------------------------------
> --------------------------------------------------------------
> >>> Installing kernel GENERIC on Mon Sep 2 10:10:05 UTC 2024
> --------------------------------------------------------------
> cd /usr/obj/usr/src/riscv.riscv64/sys/GENERIC; MACHINE_ARCH=riscv64 MACHINE=riscv CPUTYPE= CC="cc -target riscv64-unknown-freebsd15.0 --sysroot=/usr/obj/usr/src/riscv.riscv64/tmp -B/usr/obj/usr/src/riscv.riscv64/tmp/usr/bin" CXX="c++ -target riscv64-unknown-freebsd15.0 --sysroot=/usr/obj/usr/src/riscv.riscv64/tmp -B/usr/obj/usr/src/riscv.riscv64/tmp/usr/bin" CPP="cpp -target riscv64-unknown-freebsd15.0 --sysroot=/usr/obj/usr/src/riscv.riscv64/tmp -B/usr/obj/usr/src/riscv.riscv64/tmp/usr/bin" AS="as" AR="ar" ELFCTL="elfctl" LD="ld" LLVM_LINK="" NM=nm OBJCOPY="objcopy" RANLIB=ranlib STRINGS= SIZE="size" STRIPBIN="strip" PATH=/usr/obj/usr/src/riscv.riscv64/tmp/bin:/usr/obj/usr/src/riscv.riscv64/tmp/usr/sbin:/usr/obj/usr/src/riscv.riscv64/tmp/usr/bin:/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/sbin:/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/bin:/usr/obj/usr/src/riscv.riscv64/tmp/legacy/bin:/usr/obj/usr/src/riscv.riscv64/tmp/legacy/usr/libexec::/sbin:/bin:/usr/sbin:/usr/bin make KERNEL=kernel METALOG= install
> thiskernel=`sysctl -n kern.bootfile || echo /boot/kernel/kernel` ; if [ ! "`dirname "$thiskernel"`" -ef /boot/kernel ] ; then chflags -R noschg /boot/kernel ; rm -rf /boot/kernel ; rm -rf /usr/lib/debug/boot/kernel ; else if [ -d /boot/kernel.old ] ; then chflags -R noschg /boot/kernel.old ; rm -rf /boot/kernel.old ; fi ; mv /boot/kernel /boot/kernel.old ; if [ -n "/usr/lib/debug" -a -d /usr/lib/debug/boot/kernel ]; then rm -rf /usr/lib/debug/boot/kernel.old ; mv /usr/lib/debug/boot/kernel /usr/lib/debug/boot/kernel.old ; fi ; sysctl kern.bootfile=/boot/kernel.old/"`basename "$thiskernel"`" ; fi
> kern.bootfile: /boot/kernel/kernel -> /boot/kernel.old/kernel
> mkdir -p /boot/kernel
> install -p -m 444 -o root -g wheel kernel /boot/kernel/
> mkdir -p /usr/lib/debug/boot/kernel
> install -p -m 444 -o root -g wheel kernel.debug /usr/lib/debug/boot/kernel/
> cd /usr/src/sys/modules; MAKEOBJDIRPREFIX=/usr/obj/usr/src/riscv.riscv64/sys/GENERIC/modules KMODDIR=/boot/kernel MACHINE_CPUARCH=riscv MACHINE=riscv MACHINE_ARCH=riscv64 MODULES_EXTRA="dtb/sifive" WITHOUT_MODULES="" ARCH_FLAGS="" DEBUG_FLAGS="-g" __MPATH="" KERNBUILDDIR="/usr/obj/usr/src/riscv.riscv64/sys/GENERIC" SYSDIR="/usr/src/sys" MODULE_TIED=yes WITH_CTF="1" make install
> ===> accf_data (install)
> install -T release -o root -g wheel -m 444 accf_data.ko /boot/kernel/
> install -T dbg -o root -g wheel -m 444 accf_data.ko.debug /usr/lib/debug/boot/kernel/
> ===> accf_dns (install)
> install -T release -o root -g wheel -m 444 accf_dns.ko /boot/kernel/
> install -T dbg -o root -g wheel -m 444 accf_dns.ko.debug /usr/lib/debug/boot/kernel/
> .
> .
> . etc etc etc
> .
> .
> ===> xz (install)
> install -T release -o root -g wheel -m 444 xz.ko /boot/kernel/
> install -T dbg -o root -g wheel -m 444 xz.ko.debug /usr/lib/debug/boot/kernel/
> ===> zfs (install)
> install -T release -o root -g wheel -m 444 zfs.ko /boot/kernel/
> install -T dbg -o root -g wheel -m 444 zfs.ko.debug /usr/lib/debug/boot/kernel/
> ===> zlib (install)
> install -T release -o root -g wheel -m 444 zlib.ko /boot/kernel/
> install -T dbg -o root -g wheel -m 444 zlib.ko.debug /usr/lib/debug/boot/kernel/
> kldxref /boot/kernel
> kldxref: /boot/kernel/kernel: no ELF relocation table found
>
> --------------------------------------------------------------
> >>> Installing kernel GENERIC completed on Mon Sep 2 10:13:55 UTC 2024
> --------------------------------------------------------------
>
>
>
>
> So then ... "no ELF relocation table found"?
>
> Looking at https://cgit.freebsd.org/src/tree/usr.sbin/kldxref/ef.c#n220
> and then downwards to line 367 :
>
> if (rel_off == 0 && rela_off == 0) {
> warnx("%s: no ELF relocation table found\n", ef->ef_name);
> error = EFTYPE;
> goto out;
> }
>
> Which makes me wonder about the ( I hope ) harmless output from this :
>
>
> # kldxref -dv /boot/kernel
> /boot/kernel/accf_data.ko
> module accf_data
> depends on kernel.1500023 (1500023,1500023)
> interface accf_data.1
> /boot/kernel/accf_dns.ko
> module accf_dns
> depends on kernel.1500023 (1500023,1500023)
> interface accf_dns.1
> .
> .
> .
> /boot/kernel/kern_testfrwk.ko
> module kern_testframework
> interface kern_testframework.1
> depends on kernel.1500023 (1500023,1500023)
> /boot/kernel/kernel
> kldxref: /boot/kernel/kernel: no ELF relocation table found
>
> kldxref: /boot/kernel/kernel: not a valid DSO or object file: Inappropriate file type or format
> /boot/kernel/kgssapi.ko
> module kgssapi
> depends on kernel.1500023 (1500023,1500023)
> depends on xdr.1 (1,1)
> depends on krpc.1 (1,1)
> interface kgssapi.1
> .
> .
> .
>
> etc etc
>
> .
> .
> .
>
>
>
>
>
> Also I do see this was created :
>
> e# ls -lapb /boot/kernel/linker.hints
> -rw-r--r-- 1 root wheel 212416 Sep 2 10:13 /boot/kernel/linker.hints
> e#
>
> Looking over the output from "readelf -delV /boot/kernel.old/kernel" as
> well as this new kernel they both look very similar. Addresses and some
> other bits changed of course.
>
> So therefore the situation :
>
> ( 1 ) well understood and just a normal red herring[1]
>
> ( 2 ) ignore it
>
> ( 3 ) huh? that's weird. never saw that before.
>
> Curious what is going on there.
It’s a harmless warning from an overly-careful set of checks. The tool
was refactored and this case went from being ignored to warning. Cc’ing
jhb@ to remind him of this as I pointed it out a while ago.
Jess