find_local_syms for <modified-file>: found_none

[kkumar-fk]

I am trying to live patch a Debian Buster system.

$ uname -a
Linux virt-test-none-8531950 4.19.0-22-cloud-amd64 #1 SMP Debian 4.19.260-1 (2022-09-29) x86_64 GNU/Linux

$ cat /proc/version 
Linux version 4.19.0-22-cloud-amd64 (debian-kernel@lists.debian.org) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 4.19.260-1 (2022-09-29)

$ head -6 debian/Makefile 
# SPDX-License-Identifier: GPL-2.0
VERSION = 4
PATCHLEVEL = 19
SUBLEVEL = 260
EXTRAVERSION =
NAME = "People's Front"

The patch is:

$ cat uptime.patch 
--- debian/fs/proc/uptime.c	2022-09-28 14:32:58.000000000 +0530
+++ uptime.c	2023-03-01 11:21:47.420572121 +0530
@@ -23,7 +23,7 @@
 	idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
 	idle.tv_nsec = rem;
 	seq_printf(m, "%lu.%02lu %lu.%02lu\n",
-			(unsigned long) uptime.tv_sec,
+			(unsigned long) uptime.tv_sec + 1000000,
 			(uptime.tv_nsec / (NSEC_PER_SEC / 100)),
 			(unsigned long) idle.tv_sec,
 			(idle.tv_nsec / (NSEC_PER_SEC / 100)));

Patch command:
kpatch-build -j 10 -s debian/ -v /usr/lib/debug/lib/modules/$(uname -r)/vmlinux uptime.patch

This fails with:
# tail /root/.kpatch/build.log 
  LD      vmlinux.o
  MODPOST vmlinux.o
  KSYM    .tmp_kallsyms1.o
  KSYM    .tmp_kallsyms2.o
  LD      vmlinux
  SORTEX  vmlinux
  SYSMAP  System.map
  Building modules, stage 2.
  MODPOST 916 modules
/usr/lib/kpatch/create-diff-object: ERROR: uptime.o: find_local_syms: 174: find_local_syms for uptime.c: found_none

Can anyone help with how to proceed, or any suggestions?

[jpoimboe]

That error message is from code which was replaced almost 5 years ago. I'd recommend re-trying with the latest.

[kkumar-fk]

Thanks Josh, it worked as you suggested.