Re: [REGRESSION] v6.12.35: (build) kallsyms.h:21:10: fatal error: execinfo.h: No such file or directory

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Sun, Jul 13, 2025 at 04:27:36PM +0200, Achill Gilgenast wrote:
> On Tue Jul 1, 2025 at 2:26 PM CEST, Greg Kroah-Hartman wrote:
> > On Tue, Jul 01, 2025 at 02:10:26PM +0200, Natanael Copa wrote:
> >> Hi!
> >> 
> >> I bumped into a build regression when building Alpine Linux kernel 6.12.35 on x86_64:
> >> 
> >> In file included from ../arch/x86/tools/insn_decoder_test.c:13:
> >> ../tools/include/linux/kallsyms.h:21:10: fatal error: execinfo.h: No such file or directory
> >>    21 | #include <execinfo.h>
> >>       |          ^~~~~~~~~~~~
> >> compilation terminated.
> >> 
> >> The 6.12.34 kernel built just fine.
> >> 
> >> I bisected it to:
> >> 
> >> commit b8abcba6e4aec53868dfe44f97270fc4dee0df2a (HEAD)
> >> Author: Sergio Gonz_lez Collado <sergio.collado@gmail.com>
> >> Date:   Sun Mar 2 23:15:18 2025 +0100
> >> 
> >>     Kunit to check the longest symbol length
> >>     
> >>     commit c104c16073b7fdb3e4eae18f66f4009f6b073d6f upstream.
> >>     
> >> which has this hunk:
> >> 
> >> diff --git a/arch/x86/tools/insn_decoder_test.c b/arch/x86/tools/insn_decoder_test.c
> >> index 472540aeabc2..6c2986d2ad11 100644
> >> --- a/arch/x86/tools/insn_decoder_test.c
> >> +++ b/arch/x86/tools/insn_decoder_test.c
> >> @@ -10,6 +10,7 @@
> >>  #include <assert.h>
> >>  #include <unistd.h>
> >>  #include <stdarg.h>
> >> +#include <linux/kallsyms.h>
> >>  
> >>  #define unlikely(cond) (cond)
> >>  
> >> @@ -106,7 +107,7 @@ static void parse_args(int argc, char **argv)
> >>         }
> >>  }
> >>  
> >> -#define BUFSIZE 256
> >> +#define BUFSIZE (256 + KSYM_NAME_LEN)
> >>  
> >>  int main(int argc, char **argv)
> >>  {
> >> 
> >> It looks like the linux/kallsyms.h was included to get KSYM_NAME_LEN.
> >> Unfortunately it also introduced the include of execinfo.h, which does
> >> not exist on musl libc.
> >> 
> >> This has previously been reported to and tried fixed:
> >> https://lore.kernel.org/stable/DB0OSTC6N4TL.2NK75K2CWE9JV@pwned.life/T/#t
> >> 
> >> Would it be an idea to revert commit b8abcba6e4ae til we have a proper
> >> solution for this?
> >
> > Please get the fix in Linus's tree first and then we can backport it as
> > needed.
> 
> The patch now landed in Linus's tree as a95743b53031 ("kallsyms: fix
> build without execinfo"). Please backport it into the stable trees.

Already all queued up!

Thanks for letting us know.

greg k-h