test(e2e): reproduce constrained dev shm failure by wan9chi · Pull Request #522 · voidzero-dev/vite-task

wan9chi · 2026-07-09T05:00:03Z

Motivation

Reproduce issue #353 reliably before changing the Linux shared-memory backend.

Changes

Adds vtt small_dev_shm, which mounts a one-page tmpfs at /dev/shm inside private user and mount namespaces.
Adds vtt stat_long_filename and calls std::fs::metadata with a 1 MiB path.
Intercepts glibc statx so the metadata call is recorded through the preload library.
Adds a Linux glibc E2E fixture that records the current SIGBUS failure as exit code 135.

wan9chi · 2026-07-09T05:00:14Z

perf(fspy): use sparse Windows shared memory #524 : 2 dependent PRs (#525 , #526 )
fix(fspy): use memfd for Linux shared memory #523
test(e2e): reproduce constrained dev shm failure #522 👈 (View in Graphite)
docs(fspy): document shared-memory facade ownership semantics #521
refactor(fspy): introduce fspy_shm facade #520
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chatgpt-codex-connector · 2026-07-10T10:21:33Z

+    let Some(original) = statx::try_original() else {
+        // Rust's standard library interprets ENOSYS from its statx availability
+        // probe as unsupported and falls back to stat64.
+        // SAFETY: __errno_location returns the calling thread's errno storage on Linux.
+        unsafe { *libc::__errno_location() = libc::ENOSYS };
+        return -1;


Fall back to the raw syscall when libc lacks statx

On Linux systems whose libc does not export statx (for example older glibc targets), this LD_PRELOAD library still exports statx, so code that weak-links or dlsyms statx will call this shim instead of taking its own SYS_statx fallback. Returning ENOSYS here changes those traced tasks from a working kernel statx call into a failure; please invoke the raw SYS_statx path (and record the access) when RTLD_NEXT has no statx rather than exposing a stub.

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Co-authored-by: GPT-5.6 <gpt-5.6@openai.com> Co-authored-by: GPT-5 Codex <codex@openai.com>

Co-authored-by: GPT-5 Codex <codex@openai.com>

wan9chi · 2026-07-10T23:40:32Z

Merge activity

Jul 10, 11:40 PM UTC: @wan9chi merged this pull request with Graphite.

wan9chi mentioned this pull request Jul 9, 2026

refactor(fspy): introduce fspy_shm facade #520

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wan9chi force-pushed the constrained-dev-shm-e2e branch from 24813bf to ebc6e41 Compare July 9, 2026 05:12

wan9chi force-pushed the fspy-shm-lifecycle branch from 7121ef2 to e1d4fa0 Compare July 9, 2026 05:12

wan9chi force-pushed the constrained-dev-shm-e2e branch from ebc6e41 to eac0891 Compare July 9, 2026 05:22

wan9chi force-pushed the fspy-shm-lifecycle branch from e1d4fa0 to 1e4ee5f Compare July 9, 2026 05:22

wan9chi force-pushed the constrained-dev-shm-e2e branch 2 times, most recently from 82c057f to aaaf01b Compare July 9, 2026 05:35

wan9chi force-pushed the fspy-shm-lifecycle branch from 1e4ee5f to 67ee808 Compare July 9, 2026 05:35

wan9chi marked this pull request as ready for review July 9, 2026 05:42

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Comment thread crates/vite_task_bin/src/vtt/stat_file.rs Outdated

wan9chi commented Jul 9, 2026

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Comment thread crates/vite_task_bin/tests/e2e_snapshots/fixtures/constrained_dev_shm/snapshots.toml

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Comment thread crates/vite_task_bin/src/vtt/stat_file.rs

wan9chi force-pushed the fspy-shm-lifecycle branch from 67ee808 to 669ab52 Compare July 9, 2026 07:57

wan9chi force-pushed the constrained-dev-shm-e2e branch from aaaf01b to a64e9b8 Compare July 9, 2026 07:57

wan9chi force-pushed the fspy-shm-lifecycle branch 2 times, most recently from 70822fb to 8716c77 Compare July 9, 2026 14:16

wan9chi force-pushed the constrained-dev-shm-e2e branch from a64e9b8 to ae72983 Compare July 9, 2026 14:16

wan9chi marked this pull request as draft July 10, 2026 01:16

wan9chi force-pushed the fspy-shm-lifecycle branch from 8716c77 to 4e0e749 Compare July 10, 2026 06:02

wan9chi force-pushed the constrained-dev-shm-e2e branch from ae72983 to ac080f6 Compare July 10, 2026 06:02

wan9chi commented Jul 10, 2026

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wan9chi force-pushed the constrained-dev-shm-e2e branch 3 times, most recently from 4119fee to d949311 Compare July 10, 2026 07:14

wan9chi force-pushed the constrained-dev-shm-e2e branch from d949311 to 23ada60 Compare July 10, 2026 07:27

wan9chi marked this pull request as ready for review July 10, 2026 07:37

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Comment thread crates/vite_task_bin/tests/e2e_snapshots/fixtures/constrained_dev_shm/snapshots.toml

wan9chi force-pushed the constrained-dev-shm-e2e branch from 23ada60 to 7c023af Compare July 10, 2026 08:12

wan9chi commented Jul 10, 2026

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Comment thread crates/fspy_preload_unix/src/macros/linux.rs Outdated

Comment thread crates/vite_task_bin/src/vtt/main.rs Outdated

Comment thread crates/fspy_preload_unix/src/interceptions/stat.rs Outdated

wan9chi force-pushed the constrained-dev-shm-e2e branch from 7c023af to 3d71f50 Compare July 10, 2026 09:41

wan9chi marked this pull request as draft July 10, 2026 09:46

wan9chi marked this pull request as ready for review July 10, 2026 10:14

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wan9chi force-pushed the constrained-dev-shm-e2e branch from 3d71f50 to 8dac1e8 Compare July 10, 2026 14:59

wan9chi marked this pull request as draft July 10, 2026 15:00

wan9chi force-pushed the constrained-dev-shm-e2e branch from 8dac1e8 to 3433486 Compare July 10, 2026 23:32

wan9chi marked this pull request as ready for review July 10, 2026 23:33

wan9chi changed the base branch from fspy-shm-lifecycle to graphite-base/522 July 10, 2026 23:36

test(e2e): reproduce constrained dev shm failure

2b5e676

Co-authored-by: GPT-5.6 <gpt-5.6@openai.com> Co-authored-by: GPT-5 Codex <codex@openai.com>

wan9chi force-pushed the graphite-base/522 branch from 2b0d301 to 53345ce Compare July 10, 2026 23:36

wan9chi force-pushed the constrained-dev-shm-e2e branch from 3433486 to 0f5cacc Compare July 10, 2026 23:36

graphite-app Bot changed the base branch from graphite-base/522 to main July 10, 2026 23:37

chore: remove unrelated formatting changes

cf3315b

Co-authored-by: GPT-5 Codex <codex@openai.com>

wan9chi force-pushed the constrained-dev-shm-e2e branch from 0f5cacc to cf3315b Compare July 10, 2026 23:37

wan9chi merged commit 9e72876 into main Jul 10, 2026
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wan9chi deleted the constrained-dev-shm-e2e branch July 10, 2026 23:40

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