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

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Message-ID: <20230628170530.derop5w2gtmgjeis@treble>
Date:   Wed, 28 Jun 2023 10:05:30 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: build failure after commit eb0481bbc4ce ("objtool: Fix
 reloc_hash size")

On Wed, Jun 28, 2023 at 06:45:54PM +0200, Michal Kubecek wrote:
> On Wed, Jun 28, 2023 at 06:06:31PM +0200, Michal Kubecek wrote:
> > On Wed, Jun 28, 2023 at 05:44:32PM +0200, Michal Kubecek wrote:
> > > On Wed, Jun 28, 2023 at 08:16:54AM -0700, Josh Poimboeuf wrote:
> > > > Interesting.  Can you add the below patch and also do:
> > > > 
> > > >   make net/ipv4/netfilter/iptable_nat.o OBJTOOL_ARGS="--stats"
> > > > 
> > > > and report the output?
> > > 
> > > With these, I get
> > > 
> > >     ...
> > >       CC [M]  net/ipv4/netfilter/iptable_nat.o
> > >     nr_sections: 40
> > >     section_bits: 10
> > >     nr_symbols: 41
> > >     symbol_bits: 10
> > >     mmap reloc: Invalid argument
> > >     make[1]: Leaving directory '/srv/ram/kobj'
> > 
> > Not sure if it's of any use but I also tried to run it under strace and
> > the failed mmap() call seems to be
> > 
> >   18761 mmap(NULL, 0, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = -1 EINVAL (Invalid argument)
> > 
> > Perhaps the problem could be that elf->num_relocs may be zero?
> 
> I added a printf() and got
> 
>   size = -4991471925827290382 = 0xbababababababaf2
> 
> for the elf_alloc_hash() invocation resulting in failed mmap().

Wut.  Can you share the .o file?

-- 
Josh