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

["Achill Gilgenast" <fossdd@pwned.life>]

On Sun Jul 13, 2025 at 4:38 PM CEST, Greg Kroah-Hartman wrote:
> 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.

Nice, thanks!