RE: OBJTOOL Build error

From: "John Aron" <john@aronetics.com>
To: "'Greg KH'" <greg@kroah.com>
Cc: 'Mark Salter' <mark.salter@canonical.com>,
	'Mark Lewis' <mark.lewis@canonical.com>,
	regressions@lists.linux.dev, stable@vger.kernel.org,
	kernelnewbies@kernelnewbies.org
Subject: RE: OBJTOOL Build error
Date: Wed, 30 Nov 2022 18:36:19 -0500	[thread overview]
Message-ID: <0be301d90514$9250bd70$b6f23850$@aronetics.com> (raw)
In-Reply-To: <Y3/c73nZVdHCBdZo@kroah.com>

One C file and a few header files.

Canonical isn't very responsive and I posted this question a few places.
Sorry about the late reply.

John

-----Original Message-----
From: Greg KH <greg@kroah.com> 
Sent: Thursday, November 24, 2022 4:07 PM
On Thu, Nov 24, 2022 at 01:48:08PM -0500, John Aron wrote:
> Hello -
> 
>  
> 
> I have an idea of where to begin: our kernel code compiles and works 
> on Red Hat, CentOS, and Fedora. In Ubuntu 20.04, I have an error.
> 
>  
> 
> root@form:/home/john/thor-linux/Kernel/ubuntu20.04# make
> 
> rmmod: ERROR: Module thor is not currently loaded
> 
> make: [Makefile:7: all] Error 1 (ignored)
> 
> make[1]: Entering directory '/usr/src/linux-headers-5.4.0-131-generic'
> 
>   CC [M]  /home/john/thor-linux/Kernel/ubuntu22.04/thor.o
> 
> /home/john/thor-linux/Kernel/ubuntu22.04/thor.o: warning: objtool:
> _Controller_process_response_map()+0x1b3:    unreachable instruction
> 
>   Building modules, stage 2.
> 
>   MODPOST 1 modules
> 
>   CC [M]  /home/john/thor-linux/Kernel/ubuntu22.04/thor.mod.o
> 
>   LD [M]  /home/john/thor-linux/Kernel/ubuntu22.04/thor.ko
> 
> make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-131-generic'
> 
> make[1]: Entering directory '/usr/src/linux-headers-5.4.0-131-generic'
> 
>   CLEAN   /home/john/thor-linux/Kernel/ubuntu22.04/Module.symvers
> 
> make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-131-generic'
> 
> #@sudo dmesg -C
> 
> #@sudo insmod /usr/local/etc/thor.ko
> 
> filename:       /usr/local/etc/thor.ko
> 
> version:        0.1
> 
> description:    THOR KMOD
> 
> author:         Aronetics
> 
> license:        GPL
> 
> srcversion:     BC856FA85DB2FEFD38A1B2A
> 
> depends:
> 
> retpoline:      Y
> 
> name:           thor
> 
> vermagic:       5.4.0-131-generic SMP mod_unload modversions
> 
> #@sudo dmesg
> 
> root@form:/home/john/thor-linux/Kernel/ubuntu20.04#
> <mailto:root@form:/home/john/thor-linux/Kernel/ubuntu20.04#>
> 
>  
> 
> Every 2.0s: tail -n30 /var/lib/dkms/thor/1.0.1/build/make.log
> 
>  
> 
> DKMS make.log for thor-1.0.1 for kernel 5.4.0-131-generic (x86_64)
> 
> Thu 24 Nov 2022 01:10:33 PM EST
> 
> make: Entering directory '/usr/src/linux-headers-5.4.0-131-generic'
> 
>   CC [M]  /var/lib/dkms/thor/1.0.1/build/thor.o
> 
> /var/lib/dkms/thor/1.0.1/build/thor.o: warning: objtool:
> _Controller_process_response_map()+0x1b3: unreachable instruction
> 
>   Building modules, stage 2.
> 
>   MODPOST 1 modules
> 
>   CC [M]  /var/lib/dkms/thor/1.0.1/build/thor.mod.o
> 
>   LD [M]  /var/lib/dkms/thor/1.0.1/build/thor.ko
> 
> make: Leaving directory '/usr/src/linux-headers-5.4.0-131-generic'
> 
>  
> 
> Is this an error in objtool on Ubuntu within 
> /usr/src/linux-headers-5.4.0-${26-130}/tools/objtool ?

Do you have a pointer to your code anywhere?  Do you have .S files in it, or
is it all C files?

And did you ask the Canonical developers about this?  You should have a
support contract you are paying for with them, so why not use that?

thanks,

greg k-h

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