Date: Wed, 01 Jul 2026 09:18:36 +0000 From: bugzilla-noreply@freebsd.org To: threads@FreeBSD.org Subject: [Bug 296410] sprintf/vfprintf not thread safe on AArch64 due to localeconv_l using atomic_store_int, with relaxed semantics Message-ID: <bug-296410-13406-SIAr0RnbRJ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-296410-13406@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296410 --- Comment #2 from Tomas Vondra <tomas@vondra.me> --- (In reply to Konstantin Belousov from comment #1) I'm not very familiar with how the locales work, but the way I understood localeconv_l is that it rebuilds the cached fields after a change (or on first access). And I thought maybe it's harmless if two threads rebuilt it concurrently, or something like that. But maybe you're right and after a locale change a thread could see a mix of old and new values for a given locale? I guess that'd mean using atomics for protecting other fields (as implemented here) is not quite sufficient. -- You are receiving this mail because: You are the assignee for the bug.home | help
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