On 11/28/2017 07:20 PM, Lee Strobel wrote: > Hi, > > I have a question about the Linux kernel, which I have been trying to > find an answer to through various forums for some time now, but without > success. I'm wondering if anyone on this mailing list might be able to > help? > > I've been trying to build a Linux From Scratch (LFS) system, using > SysVinit and sysklogd. However, when I tried to boot up, klogd wasn't > accepting the System.map file, printing log messages such as: > > Oct 9 17:24:17 <lee_lfs> kernel: klogd 1.5.1, log source = /proc/kmsg > started. > Oct 9 17:24:17 <lee_lfs> kernel: Inspecting /boot/System.map > Oct 9 17:24:17 <lee_lfs> kernel: Cannot find map file. > > So, I dug into the source code for klogd a little bit, and it appears > the reason the map file wasn't being accepted was because it didn't > contain a 'version' line, which klogd was looking for, in the form: > > [address] [type] Version_XXXXX > > (where XXXXX is the kernel version # in base 256). > > So, I've been asking around on various forums. It seems that none of the > map files that are being produced by more recent kernel versions include > this line and no-one that I've spoken to on the Linux user forums seems > to know why this is. > > Was a change made to the kernel, to remove this 'version' line > from the map file? If so, how are the newer init systems verifying that > the map file is the same version as the running kernel? Perhaps sysklogd > needs to be updated? > > By the way, I tried adding a 'dummy' version line to my map file and > klogd accepted it fine. > > Hopefully someone out there can assist, as no-one in the Linux user > community seems to know what is going on with this. > > Best regards, > > Lee Strobel > Engineer/Tinkerer/Free Software Supporter ..
Hi, Having that symbol in the System.map file depends on the kernel config symbol CONFIG_KALLSYMS. KALLSYMS must be disabled (unset) for that symbol to be generated. I don't know why it's like that. ffffffff815e50a8 B Version_197216 Ted, do you have any idea about that? thanks. -- ~Randy
