Re: fs/netfs/read_retry.c:235:20: error: variable 'subreq' is uninitialized when used here [-Werror,-Wuninitialized]

[Nathan Chancellor <nathan@kernel.org>]

On Tue, Dec 03, 2024 at 04:55:55PM +0000, David Howells wrote:
> Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> 
> > Build error:
> > ---------
> > fs/netfs/read_retry.c:235:20: error: variable 'subreq' is
> > uninitialized when used here [-Werror,-Wuninitialized]
> >   235 |         if (list_is_last(&subreq->rreq_link, &stream->subrequests))
> >       |                           ^~~~~~
> > fs/netfs/read_retry.c:28:36: note: initialize the variable 'subreq' to
> > silence this warning
> >    28 |         struct netfs_io_subrequest *subreq;
> >       |                                           ^
> >       |                                            = NULL
> > 1 error generated.
> > make[5]: *** [scripts/Makefile.build:194: fs/netfs/read_retry.o] Error 1
> > 
> > Build image:
> > -----------
> > - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20241126/testrun/26060810/suite/build/test/clang-19-lkftconfig/log
> > - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20241126/testrun/26060810/suite/build/test/clang-19-lkftconfig/details/
> > - https://storage.tuxsuite.com/public/linaro/lkft/builds/2pNKzjvChfT6aOWplZaZeQzbYCX/
> > 
> > Steps to reproduce:
> > ------------
> > - tuxmake --runtime podman --target-arch x86_64 --toolchain clang-19
> > --kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2pNKzjvChfT6aOWplZaZeQzbYCX/config
> > LLVM=1 LLVM_IAS=1
> > 
> > The git log shows
> > $ git log --oneline  next-20241122..next-20241125 -- fs/netfs/read_retry.c
> > 1bd9011ee163e netfs: Change the read result collector to only use one work item
> > 5c962f9982cd9 netfs: Don't use bh spinlock
> > 3c8a83f74e0ea netfs: Drop the was_async arg from netfs_read_subreq_terminated()
> > 2029a747a14d2 netfs: Abstract out a rolling folio buffer implementation
> > 
> > metadata:
> > ----
> >   git describe: next-20241125 and next-20241126
> >   git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> >   git sha: ed9a4ad6e5bd3a443e81446476718abebee47e82
> >   kernel config:
> > https://storage.tuxsuite.com/public/linaro/lkft/builds/2pNKzjvChfT6aOWplZaZeQzbYCX/config
> 
> That should be fixed on my branch now:
> 
>    https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=netfs-writeback
> 
> I'm just moving the branch to v6.13-rc1 and fixing reported issues before
> asking Christian to repull it.

Is there any progress on getting this into -next? This warning has
broken our builds for a grand total of a few weeks at this point...

Cheers,
Nathan