ubuntu-kernel-tests

ubuntu_bpf / net test in ubuntu_kernel_selftests failed to build on B-5.4 with "error: use of unknown builtin '__builtin_preserve_access_index'"

Bug #1882559 reported by Po-Hsu Lin on 2020-06-08

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	ubuntu-kernel-tests	Fix Released	Undecided	Po-Hsu Lin
	linux-gcp-5.4 (Ubuntu)	Invalid	Undecided	Unassigned

Bug Description

Issue found on 5.4.0-1011.11~18.04.1 GCP

The compilation failed with:
(clang -I. -I./include/uapi -I../../../include/uapi -I/home/jenkins/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/../usr/include -D__TARGET_ARCH_x86 -idirafter /usr/local/include -idirafter /usr/lib/llvm-6.0/lib/clang/6.0.0/include -idirafter /usr/include/x86_64-linux-gnu -idirafter /usr/include -Wno-compare-distinct-pointer-types -O2 -target bpf -emit-llvm -c progs/test_core_reloc_ints.c -o - || echo "clang failed") | \
llc -march=bpf -mcpu=probe -filetype=obj -o /home/jenkins/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/test_core_reloc_ints.o
progs/test_core_reloc_ints.c:32:6: error: use of unknown builtin '__builtin_preserve_access_index' [-Wimplicit-function-declaration]

Please find the attachment for the complete build log.

Tags:

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2020-06-08:

build.log Edit (97.3 KiB, text/plain)

summary:	- ubuntu_bpf failed to build on B-5.4 GCP + ubuntu_bpf failed to build on B-5.4 GCP with "error: use of unknown + builtin '__builtin_preserve_access_index'"
tags:	added: 5.4 bionic gcp kqa-blocker sru-20200518 ubuntu-kernel-selftests
affects:	linux-gcp (Ubuntu) → linux-gcp-5.4 (Ubuntu)

Sean Feole (sfeole) on 2020-06-08

Changed in ubuntu-kernel-tests:
status:	New → Triaged
tags:	added: aws azure

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2020-06-18: Re: ubuntu_bpf failed to build on B-5.4 GCP/Oracle with "error: use of unknown builtin '__builtin_preserve_access_index'"

Discussion upstream: https://<email address hidden>/msg315068.html

tags:	added: oracle sru-20200608
summary:	- ubuntu_bpf failed to build on B-5.4 GCP with "error: use of unknown - builtin '__builtin_preserve_access_index'" + ubuntu_bpf failed to build on B-5.4 GCP/Oracle with "error: use of + unknown builtin '__builtin_preserve_access_index'"

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2020-06-18:

This issue does not exist on Oracle Focal 5.4.

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2020-06-23: Re: ubuntu_bpf failed to build on B-5.4 GCP/Oracle/Azure with "error: use of unknown builtin '__builtin_preserve_access_index'"

Spotted on Bionic 5.4 Azure.

summary:

- ubuntu_bpf failed to build on B-5.4 GCP/Oracle with "error: use of
+ ubuntu_bpf failed to build on B-5.4 GCP/Oracle/Azure with "error: use of
unknown builtin '__builtin_preserve_access_index'"

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2020-07-10:

This issue can be found on B-5.4 generic kernel as well.

It looks like with clang-9 and llvm-9 installed, the test can be built and tested.

export CLANG=clang-9
export LLC=llc-9
export LLVM_OBJCOPY=llvm-objcopy-9
export LLVM_READELF=llvm-readelf-9

Po-Hsu Lin (cypressyew) on 2020-07-13

Changed in ubuntu-kernel-tests:
assignee:	nobody → Po-Hsu Lin (cypressyew)

Revision history for this message

Po-Hsu Lin (cypressyew) wrote on 2020-07-13:

This is affecting the net test build in ubuntu_kernel_selftests as well.

Po-Hsu Lin (cypressyew) on 2020-07-13

summary:	- ubuntu_bpf failed to build on B-5.4 GCP/Oracle/Azure with "error: use of - unknown builtin '__builtin_preserve_access_index'" + ubuntu_bpf / net test in ubuntu_kernel_selftests failed to build on + B-5.4 GCP/Oracle/Azure with "error: use of unknown builtin + '__builtin_preserve_access_index'"
summary:	ubuntu_bpf / net test in ubuntu_kernel_selftests failed to build on - B-5.4 GCP/Oracle/Azure with "error: use of unknown builtin + B-5.4 with "error: use of unknown builtin '__builtin_preserve_access_index'"
Changed in linux-gcp-5.4 (Ubuntu):
status:	New → Invalid
Changed in ubuntu-kernel-tests:
status:	Triaged → In Progress