linux-kernel - Re: build failure after commit eb0481bbc4ce ("objtool: Fix reloc

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Date:   Mon, 17 Jul 2023 00:56:41 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: build failure after commit eb0481bbc4ce ("objtool: Fix
 reloc_hash size")

On Mon, Jul 10, 2023 at 10:16:28AM -0700, Josh Poimboeuf wrote:
> On Sun, Jul 09, 2023 at 05:09:29PM +0300, Michal Kubecek wrote:
> > On Sat, Jul 08, 2023 at 03:40:50PM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
> > > On 28.06.23 13:58, Michal Kubecek wrote:
> > > > 
> > > > this morning, mainline kernel builds started to fail on my desktop like
> > > > this:
> > > > 
> > > >   mike@...n:~/work/git/kernel-upstream> mkdir /srv/ram/kobj
> > > >   mike@...n:~/work/git/kernel-upstream> make -j24 CC=gcc-13 O=/srv/ram/kobj defconfig >/dev/null
> > > >   mike@...n:~/work/git/kernel-upstream> make -j24 CC=gcc-13 O=/srv/ram/kobj all >/dev/null
> > > >   net/ipv4/netfilter/iptable_nat.o: warning: objtool: mmap fail reloc
> > > >   net/netfilter/xt_mark.o: warning: objtool: mmap fail reloc
> > > >   net/netfilter/xt_nat.o: warning: objtool: mmap fail reloc
> > > >   net/netfilter/xt_LOG.o: warning: objtool: mmap fail reloc
> > > >   net/netfilter/xt_MASQUERADE.o: warning: objtool: mmap fail reloc
> > > >   net/netfilter/nf_log_syslog.o: warning: objtool: mmap fail reloc
> > > >   net/netfilter/xt_addrtype.o: warning: objtool: mmap fail reloc
> > > >   fs/efivarfs/efivarfs.o: warning: objtool: mmap fail reloc
> > > >   drivers/thermal/intel/x86_pkg_temp_thermal.o: warning: objtool: mmap fail reloc
> > > >   vmlinux.o: warning: objtool: mmap fail reloc
> > > >   incomplete ORC unwind tables in file: vmlinux
> > > >   Failed to sort kernel tables
> > > >   make[2]: *** [/home/mike/work/git/kernel-upstream/scripts/Makefile.vmlinux:35: vmlinux] Error 1
> > > >   make[2]: *** Deleting file 'vmlinux'
> > > >   make[1]: *** [/home/mike/work/git/kernel-upstream/Makefile:1256: vmlinux] Error 2
> > > >   make: *** [Makefile:226: __sub-make] Error 2
> > > > 
> > > > I bisected the failure to commit
> > > > 
> > > >   eb0481bbc4ce ("objtool: Fix reloc_hash size")
> > > > 
> > > > I also tried gcc11 and building on a normal filesystem (rather than
> > > > tmpfs) but the result is still the same. Different configurations (e.g.
> > > > allmodconfig) only show more modules with "mmap fail reloc". The machine
> > > > has 64 GB of RAM and both ulimit -m and ulimit -v show "unlimited".
> > > > Anything idea what else I should try?
> > > 
> > > Michal, thx for the report. Please correct me if I'm wrong: this as of
> > > now is unfixed, as your patch to fix is afaics wasn't merged yet (at
> > > least I can't see it even in next, but I might be missing something).
> > 
> > Yes, the fix has not been merged yet and current master (commit
> > 1c7873e33645) still shows the issue.
> 
> Should be fixed in the tip tree with the following patch:
> 
> https://lkml.kernel.org/lkml/168897683429.404.6801969953192508868.tip-bot2@tip-bot2

The fix reached mainline now as

  9f71fbcde282 ("objtool: initialize all of struct elf")

and is present in 6.5-rc2 so that it no longer exhibits the issue.

Michal

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