On Wed, Mar 31, 2021 at 10:47 AM Baoquan He <bhe@xxxxxxxxxx> wrote: > > On 03/24/21 at 12:28pm, Patrick Sung wrote: > > Hello all, > > > > I am using the 4.9 long term kernel which is currently at 4.9.262. > > When using this kernel with kexec-tools it prints out this error > > > > Unsupported utsname.release: 4.9.262 > > Cannot load <kdump images path> > > > > A quick search in the code shows that kexec/kernel_version.c doing this check: > > > > if (major >= 256 || minor >= 256 || patch >= 256) { > > > > and also in kexec/kexec.h > > #define KERNEL_VERSION(major, minor, patch) \ > > (((major) << 16) | ((minor) << 8) | patch) > > Yeah, this seems to be a good catch. The existing longterm kenrel 4.9.262 > does cause the problem. I am not very sure about the longterm kernel > version numbering, maybe we can leave 16 bits for for patch number to > avoid the longterm kernel issue? > > Is there document telling the longterm kernel version numbering, or any > pointer? > Actually I found that the mainline kernel clamp the "patch" version to 255 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/Makefile?id=9b82f13e7ef316cdc0a8858f1349f4defce3f9e0 > Thanks > Baoquan > > > > > which explains the reason for the range check in kernel_version.c > > > > Increasing the number of bits allowed in "patch" seems to fix the issue. > > > > Thanks, > > Patrick > > > > _______________________________________________ > > kexec mailing list > > kexec@xxxxxxxxxxxxxxxxxxx > > http://lists.infradead.org/mailman/listinfo/kexec > > > _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec