Date: Sun, 24 Sep 2017 11:31:19 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 222551] Code generated by Clang using union aliasing results in segmentation fault Message-ID: <bug-222551-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222551 Bug ID: 222551 Summary: Code generated by Clang using union aliasing results in segmentation fault Product: Base System Version: 11.1-RELEASE Hardware: i386 OS: Any Status: New Severity: Affects Many People Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: 1983-01-06@gmx.net This was discovered while working on https://svnweb.freebsd.org/ports/head/lang/duktape/. Using a double and an int array with eight elements corrupts the union. The issue has been reported against duktape: https://github.com/svaarala/duktape/issues/1752 , though already known since 2103 (http://lists.llvm.org/pipermail/cfe-users/2013-December/000321.html) and it turned out to be a Clang bug in FreeBSD which has been fixed in 5.0.0: https://bugs.llvm.org/show_bug.cgi?id=32056. I simple example is availabe at https://github.com/svaarala/duktape/blob/master/misc/clang_aliasing.c. The fix from Clang trunk requires a backport to 4.0.x and update in FreeBSD base. Unfortunately, there is no workaround to this issue unless you install llvm50 from ports. -- You are receiving this mail because: You are the assignee for the bug.
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