Re: [GIT PULL] objtool fixes and updates

Philip Li
2025-04-01T00:39:04Z

On Mon, Mar 31, 2025 at 03:17:51PM -0700, Josh Poimboeuf wrote:
> On Mon, Mar 31, 2025 at 06:10:45PM +0200, Ingo Molnar wrote:
> > > > This can be seen in the full report:
> > > >
> > > > https://lore.kernel.org/oe-kbuild-all/202503280703.OARM8SrY-lkp@intel.com/
> > > >
> > > > All warnings (new ones prefixed by >>):
> > > >
> > > > arch/loongarch/kernel/traps.o: warning: objtool: show_stack+0xe0: stack state mismatch: reg1[22]=-1+0 reg2[22]=-2-160
> > > > arch/loongarch/kernel/traps.o: warning: objtool: show_stack+0xe0: stack state mismatch: reg1[23]=-1+0 reg2[23]=-2-152
> > > > >> arch/loongarch/kernel/traps.o: warning: objtool: show_stack+0xe0: skipping duplicate warning(s)
> > > >
> > > > Note how '>>' is the new warning - the summary line added recently that
> > > > suggests that there's more warnings. It appears to me the test-bot
> > > > considers the other warnings old regressions, but I couldn't find any
> > > > trace of them being reported before. Maybe they weren't Cc:-ed to lkml.
> > > >
> > > > Or maybe these *are* all new warnings. I've Cc:-ed the LKP folks.
> > >
> > > Hi Ingo and all, sorry for confusion, here only the line with >> is considered
> > > as new warning, due to the commit 0a7fb6f07e3a you mentioned.
> >
> > Oh, so the loongson 'stack state mismatch' warnings started sometime in
> > the past, but were never reported by the bot? Or were they reported
> > somewhere? I'd like to discover the timeline of those warnings, if
> > that's possible.
>
> I believe those warnings were introduced a year ago with:
>
> cb8a2ef0848c ("LoongArch: Add ORC stack unwinder support")
>
> but I wasn't able to find the original report.

Hi Ingo and Josh, for this cb8a2ef0848c commit, the bot has reported at [1]
but with a different randconfig and a different issue pattern. And the bot
didn't report new ones as it considered the bad commit was already reported.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit: cb8a2ef0848ca80d67d6d56e2df757cfdf6b3355 LoongArch: Add ORC stack unwinder support
config: loongarch-randconfig-002-20240812
(https://download.01.org/0day-ci/archive/20240812/202408120955.qls5oNQY-lkp@intel.com/config)

WARNING: modpost: missing MODULE_DESCRIPTION() in net/ieee802154/6lowpan/ieee802154_6lowpan.o
>> ERROR: modpost: "kvm_restore_lsx" [arch/loongarch/kvm/kvm.ko] undefined!
>> ERROR: modpost: "kvm_restore_lasx" [arch/loongarch/kvm/kvm.ko] undefined!

Later, there's fix at [2], but seems it doesn't solve all possible issues since
the bot didn't report out explicitly.

[1] https://lore.kernel.org/oe-kbuild-all/202408120955.qls5oNQY-lkp@intel.com/
[2] https://lore.kernel.org/all/20240604150741.30252-1-xry111@xry111.site/

Thanks

>
> --
> Josh