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

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Date:   Wed, 28 Jun 2023 08:16:54 -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 01:58:25PM +0200, Michal Kubecek wrote:
> Hello,
> 
> 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 Kubecek

Interesting.  Can you add the below patch and also do:

  make net/ipv4/netfilter/iptable_nat.o OBJTOOL_ARGS="--stats"

and report the output?

---8<---

diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index d420b5d2e2b6..4d5559ab4668 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -81,7 +81,7 @@ static inline void __elf_hash_del(struct elf_hash_node *node,
 				 PROT_READ|PROT_WRITE, \
 				 MAP_PRIVATE|MAP_ANON, -1, 0); \
 	if (__elf_table(name) == (void *)-1L) { \
-		WARN("mmap fail " #name); \
+		perror("mmap " #name); \
 		__elf_table(name) = NULL; \
 	} \
 	__elf_table(name); \