Update LLVM to 21.1.3 #147518

dianqk · 2025-10-09T10:27:20Z

After #146124, we need more space to run x86_64-gnu-distcheck if building LLVM from source. According to the building log, the space freed by free-disk-space-linux.sh is not entirely available.

You are running out of disk space. 
The runner will stop working when the machine runs out of disk space. 
Free space left: 98 MB

disk usage:
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        72G   43G   29G  60% /
tmpfs           7.9G   84K  7.9G   1% /dev/shm
tmpfs           3.2G  1.2M  3.2G   1% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/sda16      881M   60M  760M   8% /boot
/dev/sda15      105M  6.2M   99M   6% /boot/efi
/dev/sdb1        74G   28K   70G   1% /mnt
tmpfs           1.6G   12K  1.6G   1% /run/user/1001

dianqk · 2025-10-09T10:28:04Z

@bors try jobs=x86_64-gnu-distcheck

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

rust-bors · 2025-10-09T12:46:56Z

💔 Test for d6659ce failed: CI. Failed jobs:

try - x86_64-gnu-distcheck (web logs, extended logs)

dianqk · 2025-10-09T12:55:34Z

@bors try jobs=x86_64-gnu-distcheck

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

rustbot · 2025-10-09T15:27:48Z

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

rustbot · 2025-10-09T15:27:50Z

⚠️ Warning ⚠️

Some commits in this PR modify submodules.

If this was not intentional, see I changed a submodule on accident in the rustc dev guide.

rust-bors · 2025-10-09T15:27:56Z

☀️ Try build successful (CI)
Build commit: bfdd4ca (bfdd4ca14dcc7a1a42c76b7c45521bde578bc92c, parent: acf243778e6c54cb7d54bee4be88e510e4be123e)

dianqk · 2025-10-09T23:48:00Z

r? @cuviper
r? @jieyouxu

rustbot · 2025-10-09T23:48:06Z

jieyouxu is not on the review rotation at the moment.
They may take a while to respond.

dianqk · 2025-10-09T23:51:40Z

@cuviper
69215a1 should fix the backported error.

jieyouxu · 2025-10-10T00:43:10Z

cc @marcoieni (largedisk runner)

cuviper · 2025-10-10T21:32:15Z

src/bootstrap/src/core/build_steps/test.rs

        .current_dir(plain_src_dir)
        .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    fs::remove_dir_all(plain_src_dir).unwrap();


Should these be builder.remove_dir(..)?

But anyway, somehow this unwrap failed NotFound when I tried it on beta:
#147571 (comment)

I'm not sure how that can be when it was the current_dir of the commands just before!

I found there is a dry run before.

Oh, I was close to the answer with my suggested change, and didn't even realize it! 😅

cuviper · 2025-10-10T21:58:06Z

@bors try jobs=x86_64-gnu-distcheck

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

rust-bors · 2025-10-10T22:12:42Z

💔 Test for b118d5e failed: CI. Failed jobs:

try - x86_64-gnu-distcheck (web logs, extended logs)

dianqk · 2025-10-10T22:57:58Z

@bors try jobs=x86_64-gnu-distcheck

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

rust-bors · 2025-10-11T01:18:09Z

☀️ Try build successful (CI)
Build commit: 36c699a (36c699a1a26b4eb1f67c83ab5ae72b041793ad03, parent: 9725c4baacef19345e13f91b27e66e10ef5592ae)

dianqk · 2025-10-11T01:20:33Z

@bors r=cuviper,Kobzol rollup=never

bors · 2025-10-11T01:20:36Z

📌 Commit a3482d9 has been approved by cuviper,Kobzol

It is now in the queue for this repository.

[beta] backports - Don't normalize higher-ranked assumptions if they're not used #147299 - Fix target list of `link_section` #147418 - bootstrap: add `Builder::rustc_cmd` that includes the lib path #147419 - Update LLVM to 21.1.2 #146953 - Remove the temporary directory when a check ends -- part of #147518 r? cuviper

bors · 2025-10-13T05:11:36Z

⌛ Testing commit a3482d9 with merge 3545698...

bors · 2025-10-13T08:17:57Z

☀️ Test successful - checks-actions
Approved by: cuviper,Kobzol
Pushing 3545698 to master...

github-actions · 2025-10-13T08:21:07Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 36e4f5d (parent) -> 3545698 (this PR)

Test differences

Show 11 test diffs

Stage 2

[run-make] tests/run-make/compressed-debuginfo-zstd: pass -> ignore (ignored if LLVM wasn't build with zstd for ELF section compression or LLVM is not the default codegen backend) (J0)
[assembly] tests/assembly-llvm/nvptx-safe-naming.rs#LLVM20: ignore (ignored when the LLVM version (21.1.2) is newer than majorversion 20) -> ignore (ignored when the LLVM version (21.1.3) is newer than majorversion 20) (J1)
[codegen] tests/codegen-llvm/enum/enum-discriminant-eq.rs#LLVM20: ignore (ignored when the LLVM version (21.1.2) is newer than majorversion 20) -> ignore (ignored when the LLVM version (21.1.3) is newer than majorversion 20) (J1)
[codegen] tests/codegen-llvm/issues/issue-122600-ptr-discriminant-update.rs#new: ignore (ignored when the LLVM version 21.1.2 is older than 22.0.0) -> ignore (ignored when the LLVM version 21.1.3 is older than 22.0.0) (J1)
[codegen] tests/codegen-llvm/vec_pop_push_noop.rs#new: ignore (ignored when the LLVM version 21.1.2 is older than 22.0.0) -> ignore (ignored when the LLVM version 21.1.3 is older than 22.0.0) (J1)
[codegen] tests/codegen-llvm/vecdeque_pop_push.rs#new: ignore (ignored when the LLVM version 21.1.2 is older than 22.0.0) -> ignore (ignored when the LLVM version 21.1.3 is older than 22.0.0) (J1)
[ui] tests/ui/sanitizer/kcfi-arity-requires-llvm-21-0-0.rs: ignore (ignored when the LLVM version (21.1.2) is newer than majorversion 20) -> ignore (ignored when the LLVM version (21.1.3) is newer than majorversion 20) (J2)

Additionally, 4 doctest diffs were found. These are ignored, as they are noisy.

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 35456985fab3419baf4bf111b8bbbd5e8565615d --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

x86_64-rust-for-linux: 2737.6s -> 3601.5s (31.6%)
pr-check-1: 1629.5s -> 2104.9s (29.2%)
dist-aarch64-linux: 8815.6s -> 6309.8s (-28.4%)
dist-android: 1521.6s -> 1094.2s (-28.1%)
x86_64-gnu-miri: 4617.7s -> 5464.7s (18.3%)
arm-android: 6136.0s -> 7190.9s (17.2%)
dist-x86_64-apple: 6119.8s -> 7136.2s (16.6%)
x86_64-gnu-tools: 3698.3s -> 4264.0s (15.3%)
dist-ohos-x86_64: 4105.2s -> 4685.5s (14.1%)
x86_64-gnu: 7090.6s -> 8089.6s (14.1%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2025-10-13T09:29:54Z

Finished benchmarking commit (3545698): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary 4.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	4.8%	[3.3%, 6.4%]	2
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	4.8%	[3.3%, 6.4%]	2

Cycles

Results (secondary -2.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.2%	[2.2%, 2.2%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.5%	[-4.5%, -2.5%]	4
All ❌✅ (primary)	-	-	0

Binary size

Results (secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	1
All ❌✅ (primary)	-	-	0

Bootstrap: 473.739s -> 474.753s (0.21%)
Artifact size: 388.11 MiB -> 388.13 MiB (0.01%)

wzssyqa · 2025-10-20T02:41:24Z

I met a problem with this commit:
the commit 4f74b76fb69688474e073fb26b316d9ea571388f of https://github.com/rust-lang/llvm-project seems not in any branch. So my git mirrorer cannot get this commit.

dianqk · 2025-10-20T03:09:47Z

I met a problem with this commit: the commit 4f74b76fb69688474e073fb26b316d9ea571388f of https://github.com/rust-lang/llvm-project seems not in any branch. So my git mirrorer cannot get this commit.

Hmm. How did the CI pass? Anyway, I pushed (again?).
Thank you for this report.

wzssyqa · 2025-10-20T04:31:18Z

I met a problem with this commit: the commit 4f74b76fb69688474e073fb26b316d9ea571388f of https://github.com/rust-lang/llvm-project seems not in any branch. So my git mirrorer cannot get this commit.

Hmm. How did the CI pass?

it does exist in the git, but not in any branch.
so git fetch 4f74b76fb69688474e073fb26b316d9ea571388f can success.

Anyway, I pushed (again?). Thank you for this report.

nikic · 2025-10-20T08:10:26Z

IIRC this happens when you push the commit to a fork. Github manages all the forks together, so you can still fetch the commit by ID. I've made this mistake with LLVM updates in the past as well...

Update LLVM to 21.1.3

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rust-bors bot added a commit that referenced this pull request Oct 9, 2025

Auto merge of #147518 - dianqk:update-llvm, r=<try>

d6659ce

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

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dianqk force-pushed the update-llvm branch from 2025041 to 878e69c Compare October 9, 2025 12:55

rustbot added the A-testsuite Area: The testsuite used to check the correctness of rustc label Oct 9, 2025

rust-bors bot added a commit that referenced this pull request Oct 9, 2025

Auto merge of #147518 - dianqk:update-llvm, r=<try>

bfdd4ca

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

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dianqk marked this pull request as ready for review October 9, 2025 15:25

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 9, 2025

rustbot assigned Mark-Simulacrum Oct 9, 2025

rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Oct 9, 2025

rustbot assigned cuviper and jieyouxu and unassigned Mark-Simulacrum Oct 9, 2025

dianqk assigned Kobzol Oct 9, 2025

cuviper reviewed Oct 10, 2025

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Auto merge of #147518 - dianqk:update-llvm, r=<try>

b118d5e

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

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Remove the temporary directory when a check ends

a3482d9

dianqk force-pushed the update-llvm branch from 4ac02cb to a3482d9 Compare October 10, 2025 22:57

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

Auto merge of #147518 - dianqk:update-llvm, r=<try>

36c699a

Update LLVM to 21.1.3 try-job: x86_64-gnu-distcheck

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bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 11, 2025

jieyouxu removed their assignment Oct 11, 2025

bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 13, 2025

bors merged commit 3545698 into rust-lang:master Oct 13, 2025
12 checks passed

rustbot added this to the 1.92.0 milestone Oct 13, 2025

dianqk deleted the update-llvm branch October 13, 2025 09:47

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Update LLVM to 21.1.3 #147518

Update LLVM to 21.1.3 #147518

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Test differences

Stage 2

Job duration changes

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rust-timer commented Oct 13, 2025

Overall result: no relevant changes - no action needed

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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