Benchmarks: disable jemalloc trait to fix SIGSEGV on macOS 26#1040
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Benchmarks: disable jemalloc trait to fix SIGSEGV on macOS 26#1040pblazej wants to merge 1 commit into
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The nightly benchmark workflow started failing on Jun 10: the benchmark binary segfaults during the first benchmark (BM-CONN-001), reported by package-benchmark as WaitPIDError / error code [11]. Bisected to the webrtc-xcframework 144.7559.07 -> 144.7559.08 bump (0e6fde4): the last-good SDK commit passes with .07 and crashes with only the pin flipped to .08. With the .08 binary loaded, jemalloc's malloc-zone hooks (linked by package-benchmark for malloc stats) free a pointer they don't own during CoreFoundation's one-time NSLocale._preferredLanguages init on the NSURLSession work thread: je_free_default -> zone_free -> __CFBasicHashRehash -> CFNotificationCenterAddObserver -> ... -> CFNetwork Accept-Language Disabling the Jemalloc package trait (its only default trait) removes the malloc-zone interposition entirely, which fixes the crash class regardless of what shifts early CF allocations. Malloc metrics read 0 without it; all other metrics are unaffected. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The nightly benchmark crash (SIGSEGV in the first benchmark since Jun 10) is jemalloc's malloc-zone hooks freeing a foreign pointer during CoreFoundation's one-time locale init, triggered by the webrtc-xcframework 144.7559.08 bump (bisected: last-good SDK commit +
.07passes, same commit with only the pin flipped to.08crashes). Disabling package-benchmark's Jemalloc trait removes the malloc-zone interposition entirely — malloc metrics read 0, all other metrics unaffected; full suite verified locally at main +.08.🤖 Generated with Claude Code