Re: Objtool segfault inside an VM, based on commit 24172e0d7990

[Qu Wenruo]

在 2025/11/18 04:20, Nathan Chancellor 写道:
> On Mon, Nov 17, 2025 at 03:40:35PM +1030, Qu Wenruo wrote:
> > 在 2025/11/17 13:33, Qu Wenruo 写道:
> > > 在 2025/11/17 13:10, Qu Wenruo 写道:
> > > > Hi,
> > > >
> > > > Recently I'm hitting pretty frequent objtool crashes, sometimes
> > > > during module linking (btrfs in my case) sometimes during the
> > > > vmlinux linking.
> > > >
> > > > Unfortunately I don't have a coredump for it.
> > > >
> > > > The only info so far is from dmesg (and obvious the compile failure):
> > > >
> > > > [  625.066787] traps: objtool[46220] general protection fault
> > > > ip:563ab54c6eb0 sp:7ffd9c2ba7c8 error:0 in
> > > > objtool[19eb0,563ab54b2000+1f000]
> > > >
> > > > The involved VM has the following spec:
> > > >
> > > > - Kernel branch
> > > >     Btrfs' development branch.
> > > >
> > > >     The base commit is 24172e0d79900908cf5ebf366600616d29c9b417, around
> > > >     v6.18-rc6.
> >
> > Furthermore, if just compiling on old kernels (in my case, 6.17.8), I
> > haven't yet hit a linking time segfault.
> >
> > So it's something in the v6.18 release cycle.
> >
> > Not sure if it's the recent Zen5 related hassles.
>
> I had similar objtool crashes and David's fix [1] from another bug
> report thread [2] appears to resolve this for me.
>
> [1]: https://github.com/davidhildenbrand/linux/commit/58e62699f77738188730d489accd01ad8e3cdeeb
> [2]: https://lore.kernel.org/20251117082023.90176-1-00107082@xxxxxxx/

Thanks a lot!

Indeed this thread explains why aarch64 doesn't crash and with the patch 
applied I haven't yet hit another kernel compiling crash.

Thanks,
Qu

> Cheers,
> Nathan