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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Oh Dear - This wiki page brings my mind back to a hacker listserv conversation about semantics of discourse and Kevin Mitnick isms. Please accept my inline or outline apologies. John -----Original Message----- From: Greg KH <gregkh@linuxfoundation.org> Sent: Thursday, December 1, 2022 12:58 AM To: John Aron <john@aronetics.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 A: http://en.wikipedia.org/wiki/Top_post Q: Were do I find info about this thing called top-posting? A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? A: No. Q: Should I include quotations after my reply? http://daringfireball.net/2007/07/on_top On Wed, Nov 30, 2022 at 06:36:19PM -0500, John Aron wrote:

One C file and a few header files.

Can you provide a link to them so that we can see what might be the problem? Without that, it's impossible to help, sorry. -- The repo is in a private repo online, the entry is: static int __init kernel_module_start(void) { Configuration* configuration = NULL; // enable the logger Logger_set_enabled(true); log_info("Starting Aronetics kernel module (configuration file name: \"%s\")...\n", _FILE_NAME_CONFIGURATION); controller = Controller_new(_FILE_NAME_CONFIGURATION); if (controller != NULL) { configuration = Controller_get_configuration(controller); String_dump_and_delete(Configuration_to_string(configuration)); log_verbose(" Initializing mutex...\n"); mutex_init(&controller_mutex); switch (Configuration_get_execution_mode(configuration)) { // case TestExecutionMode: // run_tests(); // break; default: log_verbose(" Initializing controller...\n"); if (Controller_initialize(controller) == 0) { log_verbose(" Setting up timer...\n"); timer_setup(&controller_timer, on_timer, 0); log_verbose(" Initalizing timer...\n"); mod_timer(&controller_timer, jiffies + msecs_to_jiffies(DELAY_ITERATION)); log_verbose("Aronetics kernel module started\n"); } else { log_error("Initialization failed."); } break; } } return 0; } thanks, greg k-h