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Bug#1082727: llvm-18: LLVM miscompiles certain floating point library calls

From	Timothy Pearson <tpearson@debian.org>
Newsgroups	linux.debian.bugs.dist
Subject	Bug#1082727: llvm-18: LLVM miscompiles certain floating point library calls
Date	2024-09-25 05:00 +0200
Message-ID	<JqqpX-eDVS-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Package: llvm-18
Version: 1:18.1.8-11
Severity: important
Tags: upstream patch
X-Debbugs-Cc: tpearson@debian.org

LLVM 17 and higher can miscompile the ldexp() floating point library call, leading to application malfunction or outright crash.  The liklihood of miscompilation depends heavily on on the surrounding code and target architecture, but all architectures are believed to be susceptible to miscompilation under specific circumstances.

This has been reported upstream and a patch is available via upstream pull request.

-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: ppc64el (ppc64le)

Kernel: Linux 6.8.0+ (SMP w/144 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect

Versions of packages llvm-18 depends on:
ii  libc6                 2.40-2
ii  libcurl4t64           8.10.1-1
ii  libgcc-s1             14.2.0-5
ii  libllvm18             1:18.1.8-11
ii  libpfm4               4.13.0+git32-g0d4ed0e-1
ii  libstdc++6            14.2.0-5
ii  libtinfo6             6.5-2
ii  libzstd1              1.5.6+dfsg-1
ii  llvm-18-linker-tools  1:18.1.8-11
ii  llvm-18-runtime       1:18.1.8-11
ii  zlib1g                1:1.3.dfsg+really1.3.1-1

Versions of packages llvm-18 recommends:
ii  llvm-18-dev  1:18.1.8-11

Versions of packages llvm-18 suggests:
pn  llvm-18-doc  <none>

-- no debconf information

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Bug#1082727: llvm-18: LLVM miscompiles certain floating point library calls Timothy Pearson <tpearson@debian.org> - 2024-09-25 05:00 +0200
  Bug#1082727: llvm-18: LLVM miscompiles certain floating point library calls Timothy Pearson <tpearson@solidsilicon.com> - 2024-09-25 05:10 +0200
  Bug#1082727: llvm-18: LLVM miscompiles certain floating point library calls Timothy Pearson <tpearson@solidsilicon.com> - 2024-09-26 00:10 +0200

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