Hi kernel folks,

It seems a new gcc patch uncovered a potential problem in btrfs code, see the warning/error below.

Does this look like a legit kernel problem?

-- Maxim Kuvyrkov https://www.linaro.org

On Dec 22, 2023, at 06:54, ci_notify@linaro.org wrote:

Dear contributor, our automatic CI has detected problems related to your patch(es). Please find some details below. If you have any questions, please follow up on linaro-toolchain@lists.linaro.org mailing list, Libera's #linaro-tcwg channel, or ping your favourite Linaro toolchain developer on the usual project channel.

We appreciate that it might be difficult to find the necessary logs or reproduce the issue locally. If you can't get what you need from our CI within minutes, let us know and we will be happy to help.

We track this report status in https://linaro.atlassian.net/browse/GNU-1087 , please let us know if you are looking at the problem and/or when you have a fix.

In CI config tcwg_kernel/gnu-master-arm-stable-allmodconfig after:

| commit gcc-14-6741-ge7dd72aefed | Author: Jakub Jelinek jakub@redhat.com | Date: Wed Dec 20 11:31:18 2023 +0100 | | c: Split -Wcalloc-transposed-args warning from -Walloc-size, -Walloc-size fixes | | The following patch changes -Walloc-size warning to no longer warn | about int *p = calloc (1, sizeof (int));, because as discussed earlier, | the size is IMNSHO sufficient in that case, for alloc_size with 2 | arguments warns if the product of the 2 arguments is insufficiently small. | | ... 37 lines of the commit log omitted.

Results changed to # reset_artifacts: -10 # build_abe binutils: -9 # build_abe stage1: -5 # build_abe qemu: -2 # linux_n_obj: 23978 # First few build errors in logs:

# 00:33:29 fs/btrfs/send.c:8208:44: error: ‘kvcalloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Werror=calloc-transposed-args] # 00:33:44 make[4]: *** [scripts/Makefile.build:243: fs/btrfs/send.o] Error 1 # 00:35:42 make[3]: *** [scripts/Makefile.build:480: fs/btrfs] Error 2 # 00:37:40 make[2]: *** [scripts/Makefile.build:480: fs] Error 2 # 00:47:05 make[1]: *** [/home/tcwg-buildslave/workspace/tcwg_kernel_1/linux/Makefile:1913: .] Error 2 # 00:47:05 make: *** [Makefile:234: __sub-make] Error 2

From # reset_artifacts: -10 # build_abe binutils: -9 # build_abe stage1: -5 # build_abe qemu: -2 # linux_n_obj: 33156 # linux build successful: all # linux boot successful: boot

The configuration of this build is: CI config tcwg_kernel/gnu-master-arm-stable-allmodconfig

-----------------8<--------------------------8<--------------------------8<-------------------------- The information below can be used to reproduce a debug environment:

Current build : https://ci.linaro.org/job/tcwg_kernel--gnu-master-arm-stable-allmodconfig-bu... Reference build : https://ci.linaro.org/job/tcwg_kernel--gnu-master-arm-stable-allmodconfig-bu...

Reproduce last good and first bad builds: https://git-us.linaro.org/toolchain/ci/interesting-commits.git/plain/gcc/sha...

Full commit : https://github.com/gcc-mirror/gcc/commit/e7dd72aefed851d11655aa301d6e394ec98...

List of configurations that regressed due to this commit :

• tcwg_kernel

** gnu-master-arm-stable-allmodconfig *** Failure *** https://git-us.linaro.org/toolchain/ci/interesting-commits.git/plain/gcc/sha... *** https://ci.linaro.org/job/tcwg_kernel--gnu-master-arm-stable-allmodconfig-bu...