Bug#1104745: gcc-15 ICE compiling linux kernel 6.14.5 with CONFIG_RANDSTRUCT

[Greg KH <gregkh@linuxfoundation.org>]

On Wed, Jun 11, 2025 at 06:40:48PM +0200, Uwe Kleine-König wrote:
> Hello Greg, hello Ingo,
> 
> On Sun, Jun 08, 2025 at 10:25:50AM +0200, Ingo Saitz wrote:
> > On Wed, Jun 04, 2025 at 10:43:11PM +0200, Uwe Kleine-König wrote:
> > > Control: tag -1 + fixed-upstream
> > > Control: forwarded -1 https://lore.kernel.org/r/20250530221824.work.623-kees@kernel.org
> > > 
> > > Hello,
> > > 
> > > On Mon, May 05, 2025 at 05:40:57PM +0200, Ingo Saitz wrote:
> > > > When compiling the linux kernel (tested on 6.15-rc5 and 6.14.5 from
> > > > kernel.org) with CONFIG_RANDSTRUCT enabled, gcc-15 throws an ICE:
> > > > 
> > > > arch/x86/kernel/cpu/proc.c:174:14: internal compiler error: in comptypes_check_enum_int, at c/c-typeck.cc:1516
> > > >   174 | const struct seq_operations cpuinfo_op = {
> > > >       |              ^~~~~~~~~~~~~~
> > > 
> > > This is claimed to be fixed in upstream by commit
> > > https://git.kernel.org/linus/f39f18f3c3531aa802b58a20d39d96e82eb96c14
> > > that is scheduled to be included in 6.16-rc1.
> > 
> > I can confirm applying the patches
> > 
> >     e136a4062174a9a8d1c1447ca040ea81accfa6a8: randstruct: gcc-plugin: Remove bogus void member
> >     f39f18f3c3531aa802b58a20d39d96e82eb96c14: randstruct: gcc-plugin: Fix attribute addition
> > 
> > fixes the compile issue (on vanilla 6.12, 6.14 and 6.15 kernel trees;
> > the kernels seem to run fine, too, so far). The first patch was needed
> > for the second to apply cleanly. But I can try to backport only
> > f39f18f3c3531aa802b58a20d39d96e82eb96c14 and see if it still compiles.
> 
> @Ingo: Thanks for testing and confirming the backport works.
> 
> @gregkh: I think it's reasonable to backport both
> e136a4062174a9a8d1c1447ca040ea81accfa6a8 and
> f39f18f3c3531aa802b58a20d39d96e82eb96c14. Do you already have these on
> your radar?

They are in the stable queues now.

thanks,

greg k-h