linux-kernel - Re: stable kernels 6.6.23 and 6.1.83 fails to build: error: unknown type name 'u32'

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Message-ID: <20240401172727.08b65053@ncopa-desktop.lan>
Date: Mon, 1 Apr 2024 17:27:27 +0200
From: Natanael Copa <ncopa@...inelinux.org>
To: Greg Thelen <gthelen@...gle.com>
Cc: Bagas Sanjaya <bagasdotme@...il.com>, Greg KH <greg@...ah.com>, Viktor
 Malik <vmalik@...hat.com>, Andrii Nakryiko <andrii@...nel.org>, Daniel Xu
 <dxu@...uu.xyz>, Alexei Starovoitov <ast@...nel.org>, Nick Desaulniers
 <ndesaulniers@...gle.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Regressions
 <regressions@...ts.linux.dev>, Linux Stable <stable@...r.kernel.org>
Subject: Re: stable kernels 6.6.23 and 6.1.83 fails to build: error: unknown
 type name 'u32'

On Mon, 1 Apr 2024 07:36:08 -0700
Greg Thelen <gthelen@...gle.com> wrote:

> On Mon, Apr 1, 2024 at 7:26*AM Bagas Sanjaya <bagasdotme@...il.com> wrote:
> >
> > On Mon, Apr 01, 2024 at 04:15:25PM +0200, Greg KH wrote:  
> > > On Mon, Apr 01, 2024 at 09:09:55PM +0700, Bagas Sanjaya wrote:  
> > > > Hi,
> > > >
> > > > On Bugzilla, ncopa@...inelinux.org reported resolve_btfids FTBFS regression
> > > > on musl system [1]:
> > > >  
> > > > > The latest releases fails to build with musl libc (Alpine Linux edge and v3.19):
> > > > >
> > > > > ```
> > > > > rm -f -f /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids/libbpf/libbpf.a; ar rcs /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tool
> > > > > s/bpf/resolve_btfids/libbpf/libbpf.a /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids/libbpf/staticobjs/libbpf-in.o
> > > > > In file included from main.c:73:
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:7:9: error: unknown type name 'u32'
> > > > >     7 |         u32 cnt;
> > > > >       |         ^~~
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:8:9: error: unknown type name 'u32'
> > > > >     8 |         u32 ids[];
> > > > >       |         ^~~
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:12:9: error: unknown type name 'u32'
> > > > >    12 |         u32 cnt;
> > > > >       |         ^~~
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:13:9: error: unknown type name 'u32'
> > > > >    13 |         u32 flags;
> > > > >       |         ^~~
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:15:17: error: unknown type name 'u32'
> > > > >    15 |                 u32 id;
> > > > >       |                 ^~~
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:16:17: error: unknown type name 'u32'
> > > > >    16 |                 u32 flags;
> > > > >       |                 ^~~
> > > > > /home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/include/linux/btf_ids.h:215:8: error: unknown type name 'u32'
> > > > >   215 | extern u32 btf_tracing_ids[];
> > > > >       |        ^~~
> > > > > make[4]: *** [/home/ncopa/aports/main/linux-lts/src/linux-6.6/tools/build/Makefile.build:98: /home/ncopa/aports/main/linux-lts/src/build-ltsx86_64/tools/bpf/resolve_btfids
> > > > > /main.o] Error 1
> > > > > make[4]: *** Waiting for unfinished jobs....
> > > > > make[3]: *** [Makefile:83: /home/ncopa/aports/main/linux-lts/src/build-lts.x86_64/tools/bpf/resolve_btfids//resolve_btfids-in.o] Error 2
> > > > > make[2]: *** [Makefile:76: bpf/resolve_btfids] Error 2
> > > > > make[1]: *** [/home/ncopa/aports/main/linux-lts/src/linux-6.6/Makefile:1354: tools/bpf/resolve_btfids] Error 2
> > > > > make: *** [/home/ncopa/aports/main/linux-lts/src/linux-6.6/Makefile:234: __sub-make] Error 2
> > > > > ```  
> > > >
> > > > Bisection led to upstream commit 9707ac4fe2f5ba ("tools/resolve_btfids:
> > > > Refactor set sorting with types from btf_ids.h") as the culprit.
> > > >
> > > > See the report on Bugzilla for the full thread and proposed fix.  
> > >
> > > Is the proposed fix a commit to backport?  
> >
> > Nope (see below).
> >  
> > >
> > > Digging through entries is not the easiest way to get things resolved..
> > >  
> >
> > The reporter posted the fix as bug comment [1] instead (hint: include
> > linux/types.h) but not submitted it to mailing lists first.
> >
> > Thanks.
> >
> > [1]: https://bugzilla.kernel.org/show_bug.cgi?id=218647#c2
> >
> > --
> > An old man doll... just what I always wanted! - Clara  
> 
> Does https://lore.kernel.org/all/20240328110103.28734-1-ncopa@alpinelinuxorg/
> resolve this? It's staged in the bpf tree. Though I'm not sure when
> it'll be merged upstream.

Yes. this is the fix

-nc