Disable `tests/run-make/mte-ffi` because no CI runners have MTE extensions enabled #142300

jieyouxu · 2025-06-10T15:48:32Z

This PR disables the tests/run-make/mte-ffi run-make test because it is (1) broken, and (2) no CI runners have suitable MTE extensions enabled to run it correctly. This test being broken is tracked by #141600.

The first commit also reverts mte-ffi changes introduced in #141576, as those fixes potentially changes the meaning of the test.

cc @dheaton-arm (as this test was introduced in #128384)

Context

In #141576 when converting PR CI runners from x86_64 to aarch64 runners, it was noticed that this test failed on aarch64-gnu-llvm-19-1 but not aarch64-gnu. It turns out that:

aarch64-gnu-llvm-19-1
- Uses gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2)
- Based on lscpu output, the hardware that was used for this runner does not have MTE enabled.
aarch64-gnu
- Uses gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)
- Based on lscpu output, the hardware that was used for this runner does not have MTE enabled.

Based on this comment, it seems like the test requires hardware with MTE extensions enabled to run properly (on ARMv8.5 or higher).

Furthermore, I believe this test does indeed have mismatched pointer type issues, i.e.

bar_string.c: In function ‘main’:
bar_string.c:36:9: error: assignment to ‘char *’ from incompatible pointer type ‘unsigned int *’ [-Wincompatible-pointer-types]
   36 |     ptr = (unsigned int *)((uintptr_t)ptr | 0x1fl << 56);
      |         ^

Which is only exposed by aarch64-gnu-llvm-19-1 because aarch64-gnu-llvm-19-1 uses gcc 14.2.0 whereas aarch64-gnu uses gcc 11.14.0.

Details

aarch64-gnu-llvm-19-1

gcc_version: Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 14.2.0-4ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr --with-gcc-major-version-only --program-suffix=-14 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-libstdcxx-backtrace --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-offload-targets=nvptx-none=/build/gcc-14-T7YiXd/gcc-14-14.2.0/debian/tmp-nvptx/usr --enable-offload-defaulted --without-cuda-driver --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2) 
 
lscpu: Architecture:                         aarch64
CPU op-mode(s):                       32-bit, 64-bit
Byte Order:                           Little Endian
CPU(s):                               4
On-line CPU(s) list:                  0-3
Vendor ID:                            ARM
Model name:                           Neoverse-N2
Model:                                0
Thread(s) per core:                   1
Core(s) per socket:                   4
Socket(s):                            1
Stepping:                             r0p0
BogoMIPS:                             2000.00
Flags:                                fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16
L1d cache:                            256 KiB (4 instances)
L1i cache:                            256 KiB (4 instances)
L2 cache:                             4 MiB (4 instances)
L3 cache:                             128 MiB (1 instance)
NUMA node(s):                         1
NUMA node0 CPU(s):                    0-3
Vulnerability Gather data sampling:   Not affected
Vulnerability Itlb multihit:          Not affected
Vulnerability L1tf:                   Not affected
Vulnerability Mds:                    Not affected
Vulnerability Meltdown:               Not affected
Vulnerability Mmio stale data:        Not affected
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed:               Not affected
Vulnerability Spec rstack overflow:   Not affected
Vulnerability Spec store bypass:      Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:             Mitigation; __user pointer sanitization
Vulnerability Spectre v2:             Mitigation; CSV2, BHB
Vulnerability Srbds:                  Not affected
Vulnerability Tsx async abort:        Not affected

aarch64-gnu

gcc_version: Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/11/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04) 

lscpu: Architecture:                         aarch64
CPU op-mode(s):                       32-bit, 64-bit
Byte Order:                           Little Endian
CPU(s):                               4
On-line CPU(s) list:                  0-3
Vendor ID:                            ARM
Model:                                0
Thread(s) per core:                   1
Core(s) per socket:                   4
Socket(s):                            1
Stepping:                             r0p0
BogoMIPS:                             2000.00
Flags:                                fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16
L1d cache:                            256 KiB (4 instances)
L1i cache:                            256 KiB (4 instances)
L2 cache:                             4 MiB (4 instances)
L3 cache:                             128 MiB (1 instance)
NUMA node(s):                         1
NUMA node0 CPU(s):                    0-3
Vulnerability Gather data sampling:   Not affected
Vulnerability Itlb multihit:          Not affected
Vulnerability L1tf:                   Not affected
Vulnerability Mds:                    Not affected
Vulnerability Meltdown:               Not affected
Vulnerability Mmio stale data:        Not affected
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed:               Not affected
Vulnerability Spec rstack overflow:   Not affected
Vulnerability Spec store bypass:      Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:             Mitigation; __user pointer sanitization
Vulnerability Spectre v2:             Mitigation; CSV2, BHB
Vulnerability Srbds:                  Not affected
Vulnerability Tsx async abort:        Not affected

References

https://www.kernel.org/doc/html/v5.10/arm64/memory-tagging-extension.html

cc @marcoieni as this PR reverts the tests/run-make/mte-ffi changes from #141576.

[EXPERIMENTAL] Revert `mte-ffi` changes See #141600. try-job: aarch64-gnu try-job: aarch64-gnu-llvm-19-1

jieyouxu · 2025-06-10T15:56:57Z

@bors2 try

rust-bors · 2025-06-10T15:57:00Z

⌛ Trying commit e22aa15 with merge 04a207e…

To cancel the try build, run the command @bors2 try cancel.

[EXPERIMENTAL] Revert `mte-ffi` changes See #141600. try-job: aarch64-gnu

rust-bors · 2025-06-10T17:51:54Z

☀️ Try build successful (CI)
Build commit: 04a207e (04a207ee81457edcc3278859a189c59e4264381f)

jieyouxu · 2025-07-06T14:43:47Z

@bors2 try jobs=aarch64-gnu

rust-bors · 2025-07-06T14:43:50Z

⌛ Trying commit 1f9346c with merge 3e759cf…

To cancel the try build, run the command @bors2 try cancel.

[EXPERIMENTAL] Revert `mte-ffi` changes Based on > > it failed on aarch64 (on the new aarch64-gnu-llvm-19-1 job introduced in this PR) > > This feature requires ARMv8.5 or higher. And it has to be enabled. Maybe the CI job runner does not support this extension? Let's revert the changes to this test in #141576. However, I can't explain why the test manages to *pass* on `aarch64-gnu` but not `aarch64-gnu-llvm-1` #141600. ### References - https://www.kernel.org/doc/html/v5.10/arm64/memory-tagging-extension.html try-job: aarch64-gnu

rust-bors · 2025-07-06T14:51:06Z

💔 Test failed

CI ❌

jieyouxu · 2025-07-07T06:44:37Z

@bors2 try jobs=aarch64-gnu

rust-bors · 2025-07-07T06:44:40Z

⌛ Trying commit c6cc140 with merge 5ed7e48…

To cancel the try build, run the command @bors2 try cancel.

[EXPERIMENTAL] Revert `mte-ffi` changes Based on > > it failed on aarch64 (on the new aarch64-gnu-llvm-19-1 job introduced in this PR) > > This feature requires ARMv8.5 or higher. And it has to be enabled. Maybe the CI job runner does not support this extension? Let's revert the changes to this test in #141576. However, I can't explain why the test manages to *pass* on `aarch64-gnu` but not `aarch64-gnu-llvm-1` #141600. ### References - https://www.kernel.org/doc/html/v5.10/arm64/memory-tagging-extension.html try-job: aarch64-gnu

rust-bors · 2025-07-07T08:30:15Z

💔 Test failed

CI ❌

jieyouxu · 2025-07-08T08:20:06Z

aarch64-gnu-llvm-19-1

gcc_version: Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/aarch64-linux-gnu/14/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 14.2.0-4ubuntu2' --with-bugurl=file:///usr/share/doc/gcc-14/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2,rust --prefix=/usr --with-gcc-major-version-only --program-suffix=-14 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/libexec --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-libstdcxx-backtrace --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-offload-targets=nvptx-none=/build/gcc-14-T7YiXd/gcc-14-14.2.0/debian/tmp-nvptx/usr --enable-offload-defaulted --without-cuda-driver --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.2.0 (Ubuntu 14.2.0-4ubuntu2) 
 
lscpu: Architecture:                         aarch64
CPU op-mode(s):                       32-bit, 64-bit
Byte Order:                           Little Endian
CPU(s):                               4
On-line CPU(s) list:                  0-3
Vendor ID:                            ARM
Model name:                           Neoverse-N2
Model:                                0
Thread(s) per core:                   1
Core(s) per socket:                   4
Socket(s):                            1
Stepping:                             r0p0
BogoMIPS:                             2000.00
Flags:                                fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16
L1d cache:                            256 KiB (4 instances)
L1i cache:                            256 KiB (4 instances)
L2 cache:                             4 MiB (4 instances)
L3 cache:                             128 MiB (1 instance)
NUMA node(s):                         1
NUMA node0 CPU(s):                    0-3
Vulnerability Gather data sampling:   Not affected
Vulnerability Itlb multihit:          Not affected
Vulnerability L1tf:                   Not affected
Vulnerability Mds:                    Not affected
Vulnerability Meltdown:               Not affected
Vulnerability Mmio stale data:        Not affected
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed:               Not affected
Vulnerability Spec rstack overflow:   Not affected
Vulnerability Spec store bypass:      Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:             Mitigation; __user pointer sanitization
Vulnerability Spectre v2:             Mitigation; CSV2, BHB
Vulnerability Srbds:                  Not affected
Vulnerability Tsx async abort:        Not affected

jieyouxu · 2025-07-08T08:21:33Z

aarch64-gnu

gcc_version: Using built-in specs.
COLLECT_GCC=aarch64-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/aarch64-linux-gnu/11/lto-wrapper
Target: aarch64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 11.4.0-1ubuntu1~22.04' --with-bugurl=file:///usr/share/doc/gcc-11/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-11 --program-prefix=aarch64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --enable-fix-cortex-a53-843419 --disable-werror --enable-checking=release --build=aarch64-linux-gnu --host=aarch64-linux-gnu --target=aarch64-linux-gnu --with-build-config=bootstrap-lto-lean --enable-link-serialization=2
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04) 

lscpu: Architecture:                         aarch64
CPU op-mode(s):                       32-bit, 64-bit
Byte Order:                           Little Endian
CPU(s):                               4
On-line CPU(s) list:                  0-3
Vendor ID:                            ARM
Model:                                0
Thread(s) per core:                   1
Core(s) per socket:                   4
Socket(s):                            1
Stepping:                             r0p0
BogoMIPS:                             2000.00
Flags:                                fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svebitperm svesha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bf16
L1d cache:                            256 KiB (4 instances)
L1i cache:                            256 KiB (4 instances)
L2 cache:                             4 MiB (4 instances)
L3 cache:                             128 MiB (1 instance)
NUMA node(s):                         1
NUMA node0 CPU(s):                    0-3
Vulnerability Gather data sampling:   Not affected
Vulnerability Itlb multihit:          Not affected
Vulnerability L1tf:                   Not affected
Vulnerability Mds:                    Not affected
Vulnerability Meltdown:               Not affected
Vulnerability Mmio stale data:        Not affected
Vulnerability Reg file data sampling: Not affected
Vulnerability Retbleed:               Not affected
Vulnerability Spec rstack overflow:   Not affected
Vulnerability Spec store bypass:      Mitigation; Speculative Store Bypass disabled via prctl
Vulnerability Spectre v1:             Mitigation; __user pointer sanitization
Vulnerability Spectre v2:             Mitigation; CSV2, BHB
Vulnerability Srbds:                  Not affected
Vulnerability Tsx async abort:        Not affected

Partially reverts commit 40311c4.

See RUST-141600: this test is broken in two ways: 1. This test triggers `-Wincompatible-pointer-types` on GCC 14. 2. This test requires ARMv8.5+ w/ MTE extensions enabled, but GHA CI runner hardware do not have this enabled.

rustbot · 2025-07-08T08:43:16Z

r? @Mark-Simulacrum

rustbot has assigned @Mark-Simulacrum.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

jieyouxu · 2025-07-08T08:44:33Z

(Mark has a ton of assigned PRs)
r? compiler

rustbot added A-run-make Area: port run-make Makefiles to rmake.rs T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jun 10, 2025

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rust-bors bot added a commit that referenced this pull request Jun 10, 2025

Auto merge of #142300 - jieyouxu:exp-partial-revert-141576, r=<try>

de5c40c

[EXPERIMENTAL] Revert `mte-ffi` changes See #141600. try-job: aarch64-gnu try-job: aarch64-gnu-llvm-19-1

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rust-bors bot added a commit that referenced this pull request Jun 10, 2025

Auto merge of #142300 - jieyouxu:exp-partial-revert-141576, r=<try>

04a207e

[EXPERIMENTAL] Revert `mte-ffi` changes See #141600. try-job: aarch64-gnu

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jieyouxu force-pushed the exp-partial-revert-141576 branch from e22aa15 to 3e712e5 Compare June 14, 2025 17:25

jieyouxu changed the title ~~[EXPERIMENTAL] Revert mte-ffi changes~~ Revert mte-ffi changes Jun 14, 2025

jieyouxu changed the title ~~Revert mte-ffi changes~~ [EXPERIMENTAL] Revert mte-ffi changes Jun 16, 2025

jieyouxu force-pushed the exp-partial-revert-141576 branch from 3e712e5 to 45682df Compare July 6, 2025 12:52

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jieyouxu force-pushed the exp-partial-revert-141576 branch from 4ce5f14 to 1f9346c Compare July 6, 2025 14:43

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jieyouxu force-pushed the exp-partial-revert-141576 branch from 1f9346c to c6cc140 Compare July 7, 2025 06:44

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jieyouxu changed the title ~~[EXPERIMENTAL] Revert mte-ffi changes~~ Disable tests/run-make/mte-ffi because no CI runners have MTE extensions enabled Jul 8, 2025

jieyouxu added 2 commits July 8, 2025 16:40

Revert tests/run-make/mte-ffi changes

24a25db

Partially reverts commit 40311c4.

Disable tests/run-make/mte-ffi

37136dd

See RUST-141600: this test is broken in two ways: 1. This test triggers `-Wincompatible-pointer-types` on GCC 14. 2. This test requires ARMv8.5+ w/ MTE extensions enabled, but GHA CI runner hardware do not have this enabled.

jieyouxu force-pushed the exp-partial-revert-141576 branch from c6cc140 to 37136dd Compare July 8, 2025 08:41

jieyouxu marked this pull request as ready for review July 8, 2025 08:43

rustbot assigned Mark-Simulacrum Jul 8, 2025

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jul 8, 2025

rustbot assigned WaffleLapkin and unassigned Mark-Simulacrum Jul 8, 2025

Disable tests/run-make/mte-ffi because no CI runners have MTE extensions enabled #142300

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Disable tests/run-make/mte-ffi because no CI runners have MTE extensions enabled #142300

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Disable `tests/run-make/mte-ffi` because no CI runners have MTE extensions enabled #142300

Disable `tests/run-make/mte-ffi` because no CI runners have MTE extensions enabled #142300

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