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Bug 955457 - sys-devel/mold: Segmentation fault when building =llvm-core/clang-21.0.0_pre20250503
Summary: sys-devel/mold: Segmentation fault when building =llvm-core/clang-21.0.0_pre2...
Status: UNCONFIRMED
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal
Assignee: Matthew Smith
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: systemwide-mold
  Show dependency tree
 
Reported: 2025-05-05 15:55 UTC by zyxhere
Modified: 2025-05-12 16:18 UTC (History)
3 users (show)

See Also:
Package list:
Runtime testing required: ---

Attachments
build.log (decompress with bzip2 -d) (clang-build.log.bz2,99.97 KB, application/x-bzip2)
2025-05-05 15:55 UTC, zyxhere 		Details
clang 9.1.7 mold failure einfo+log (clang-build-19.1.7-mold.log.xz,92.61 KB, application/x-xz)
2025-05-06 06:02 UTC, Sven B. 		Details
View All Add an attachment (proposed patch, testcase, etc.)

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Description zyxhere 2025-05-05 15:55:45 UTC 
Created attachment 927701 [details]
build.log (decompress with bzip2 -d)

collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core dumped
Building the latest snapshot of clang with -flto=auto causes mold to crash not sure how to diagnose though so just leaving it here.
Tried building mold without graphite and it still crashes

Portage 3.0.68 (python 3.13.3-final-0, default/linux/amd64/23.0/no-multilib/hardened/systemd, gcc-15, glibc-2.41-r1, 6.14.5-gentoo-dist-hardened x86_64)
=================================================================
                         System Settings
=================================================================
System uname: Linux-6.14.5-gentoo-dist-hardened-x86_64-12th_Gen_Intel-R-_Core-TM-_i5-1235U-with-glibc2.41
KiB Mem:    11959712 total,   4485308 free
KiB Swap:    8290300 total,   6326176 free
Timestamp of repository gentoo: Mon, 05 May 2025 08:54:59 +0000
Head commit of repository gentoo: f46e8f6bc3645e4a59f4d59db8c2d315d194a39c

Timestamp of repository guru: Sun, 04 May 2025 14:39:22 +0000
Head commit of repository guru: ea6df2f0cbf1716d6ba2b23f6f72ca2d9309bcf3

sh bash 5.2_p37-r2
ld GNU ld (Gentoo 2.44 p1) 2.44.0
app-misc/pax-utils:        1.3.8::gentoo
app-shells/bash:           5.2_p37-r2::gentoo
dev-build/autoconf:        2.13-r8::gentoo, 2.72-r1::gentoo
dev-build/automake:        1.17-r2::gentoo
dev-build/cmake:           3.31.7::gentoo
dev-build/libtool:         2.5.4::gentoo
dev-build/make:            4.4.1-r100::gentoo
dev-build/meson:           1.8.0::gentoo
dev-lang/perl:             5.40.2::gentoo
dev-lang/python:           3.12.10::gentoo, 3.13.3::gentoo
dev-lang/rust-bin:         1.85.1::gentoo, 1.86.0-r1::gentoo
llvm-core/clang:           19.1.7::gentoo, 21.0.0_pre20250503::gentoo
llvm-core/lld:             21.0.0_pre20250503::gentoo
llvm-core/llvm:            19.1.7::gentoo, 21.0.0_pre20250503::gentoo
sys-apps/baselayout:       2.17::gentoo
sys-apps/sandbox:          2.46::gentoo
sys-apps/systemd:          257.5::gentoo
sys-devel/binutils:        2.44::gentoo
sys-devel/binutils-config: 5.5.2::gentoo
sys-devel/gcc:             15.1.1_p20250503::gentoo
sys-devel/gcc-config:      2.12.1::gentoo
sys-kernel/linux-headers:  6.14::gentoo (virtual/os-headers)
sys-libs/glibc:            2.41-r1::gentoo
Repositories:

gentoo
    location: /var/db/repos/gentoo
    sync-type: git
    sync-uri: https://anongit.gentoo.org/git/repo/sync/gentoo.git
    priority: -1000
    volatile: False

guru
    location: /var/db/repos/guru
    sync-type: git
    sync-uri: https://anongit.gentoo.org/git/repo/sync/guru.git
    masters: gentoo
    volatile: False

local
    location: /var/db/repos/local
    masters: gentoo
    volatile: False

Binary Repositories:

gentoobinhost
    priority: 1
    sync-uri: https://distfiles.gentoo.org/releases/amd64/binpackages/23.0/x86-64-v3

Installed sets: @base, @extra, @gnomie, @utils
ACCEPT_KEYWORDS="amd64 ~amd64"
ACCEPT_LICENSE="@FREE"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=native -O2 -pipe -flto=auto 		-fno-semantic-interposition -floop-block -fgraphite-identity 		-floop-parallelize-all -ftrivial-auto-var-init=zero -Werror=lto-type-mismatch -fdiagnostics-color=always -Werror=strict-aliasing -Werror=format-security"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d"
CXXFLAGS="-march=native -O2 -pipe -flto=auto 		-fno-semantic-interposition -floop-block -fgraphite-identity 		-floop-parallelize-all -ftrivial-auto-var-init=zero -Werror=lto-type-mismatch -fdiagnostics-color=always -Werror=odr -Werror=format-security"
DISTDIR="/var/cache/distfiles"
ENV_UNSET="CARGO_HOME DBUS_SESSION_BUS_ADDRESS DISPLAY GDK_PIXBUF_MODULE_FILE GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR XDG_STATE_HOME"
FCFLAGS="-march=native -O2 -pipe -flto=auto 		-fno-semantic-interposition -floop-block -fgraphite-identity 		-floop-parallelize-all -ftrivial-auto-var-init=zero -Werror=lto-type-mismatch -fdiagnostics-color=always"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs binpkg-multi-instance buildpkg-live config-protect-if-modified distlocks ebuild-locks export-pms-vars fixlafiles ipc-sandbox merge-sync merge-wait multilib-strict network-sandbox news parallel-fetch pid-sandbox pkgdir-index-trusted preserve-libs protect-owned qa-unresolved-soname-deps sandbox strict strict-keepdir unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync warn-on-large-env xattr"
FFLAGS="-march=native -O2 -pipe -flto=auto 		-fno-semantic-interposition -floop-block -fgraphite-identity 		-floop-parallelize-all -ftrivial-auto-var-init=zero -Werror=lto-type-mismatch -fdiagnostics-color=always"
GENTOO_MIRRORS="http://distfiles.gentoo.org"
LANG="C.UTF8"
LD="ld.mold"
LDFLAGS="-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs -flto=auto -fuse-ld=mold -Wl,--color-diagnostics"
LEX="flex"
LIBTOOL="rlibtool"
MAKE="make LIBTOOL=rlibtool"
MAKEFLAGS="LIBTOOL=rlibtool"
MAKEOPTS="-j10 -l11"
PKGDIR="/var/cache/binpkgs"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
RUSTFLAGS="-C target-cpu=native -C linker=clang -C linker-plugin-lto 		-C link-arg=-flto=auto -C link-arg=-fuse-ld=mold"
SHELL="/bin/bash"
USE="acl amd64 aom av1 avif bluetooth bzip2 cet crypt cups dbus dist-kernel ffmpeg flac fontconfig gdbm gif gles gles2 gnome gnome-keyring gstreamer gtk gtk4 hardened harfbuzz iconv icu io-uring ipv6 jpeg jpegxl keyring lcms libaom libtirpc lto lz4 lzma lzo modemmanager ncurses networkmanager nls openh264 openmp opus orc pam pcre pdf pgo pic pie pipewire png policykit profile readline screencast seccomp sound spell ssl ssp svg systemd test-rust tiff tpm udev udisks unicode upower usb vaapi vala vpx vulkan wayland webp xattr xml xtpax zlib zstd" ABI_X86="64" ADA_TARGET="gcc_14" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_anon authn_dbm authn_file authz_dbm authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir env expires ext_filter file_cache filter headers include info log_config logio mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="aes avx avx2 f16c fma3 mmx mmxext pclmul popcnt rdrand sha sse sse2 sse3 sse4_1 sse4_2 ssse3 vpclmulqdq" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax navcom oceanserver oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 tsip tripmate tnt ublox" GUILE_SINGLE_TARGET="3-0" GUILE_TARGETS="3-0" INPUT_DEVICES="libinput" KERNEL="linux" LCD_DEVICES="bayrad cfontz glk hd44780 lb216 lcdm001 mtxorb text" LLVM_SLOT="19" LLVM_TARGETS="x86 AMDGPU" LUA_SINGLE_TARGET="lua5-1" LUA_TARGETS="lua5-1" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php8-2" POSTGRES_TARGETS="postgres17" PYTHON_SINGLE_TARGET="python3_13" PYTHON_TARGETS="python3_13" RUBY_TARGETS="ruby32" VIDEO_CARDS="intel lavapipe" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipp2p iface geoip fuzzy condition tarpit sysrq proto logmark ipmark dhcpmac delude chaos account"
Unset:  ADDR2LINE, AR, ARFLAGS, AS, ASFLAGS, CC, CCLD, CONFIG_SHELL, CPP, CPPFLAGS, CTARGET, CXX, CXXFILT, ELFEDIT, EMERGE_DEFAULT_OPTS, EXTRA_ECONF, F77FLAGS, FC, GCOV, GPROF, INSTALL_MASK, LC_ALL, LFLAGS, LINGUAS, NM, OBJCOPY, OBJDUMP, PORTAGE_BINHOST, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, PYTHONPATH, RANLIB, READELF, SIZE, STRINGS, STRIP, YACC, YFLAGS

=================================================================
                        Package Settings
=================================================================

sys-devel/mold-2.39.0::gentoo was built with the following:
USE="-debug -test"

Reproducible on both 2.38 and 2.39
Comment 1 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2025-05-05 16:00:59 UTC 
Please try to get a backtrace (either by running the failing gcc command under gdb, or by looking at coredumpctl).
Comment 2 zyxhere 2025-05-05 16:04:33 UTC 
(In reply to Sam James from comment #1)
> Please try to get a backtrace (either by running the failing gcc command
> under gdb, or by looking at coredumpctl).

The coredumps aren't captured by coredumpctl
I'll try and see if manually running the commands in build dir can get me a backtrace (if I remember to do that correctly)
Comment 3 zyxhere 2025-05-05 16:08:53 UTC 
Similar bug https://github.com/rui314/mold/issues/1449
Comment 4 zyxhere 2025-05-05 17:47:36 UTC 
Can't reproduce when doing it on my own here what I did:
chmod -R 755 /var/tmp/portage
cp -r /var/tmp/portage/llvm-core/clang-21.0.0_pre20250503/ .
cd clang-21.0.0_pre20250503/work/x/y/clang-abi_x86_64.amd64/
Then finally run the commands:
mold didn't crash


 : && /usr/bin/x86_64-pc-linux-gnu-g++ -O2 -pipe -flto=auto -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual -fno-strict-aliasing -pedantic -Wno-long-long -Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs -flto=auto -fuse-ld=mold -Wl,--color-diagnostics    -Wl,--gc-sections tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/AddUsing.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/AnnotateHighlightings.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/DumpAST.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/DefineInline.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/DefineOutline.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ExpandDeducedType.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ExpandMacro.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ExtractFunction.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ExtractVariable.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/MemberwiseConstructor.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ObjCLocalizeStringLiteral.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ObjCMemberwiseInitializer.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/PopulateSwitch.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/RawStringLiteral.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/RemoveUsingNamespace.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/ScopifyEnum.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/SpecialMembers.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/SwapBinaryOperands.cpp.o tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/SwapIfBranches.cpp.o tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdToolMain.cpp.o -o bin/clangd -L/usr/lib/llvm/21/lib64 -Wl,-rpath,"\$ORIGIN/../lib64:/var/tmp/portage/llvm-core/clang-21.0.0_pre20250503/work/x/y/clang-abi_x86_64.amd64/lib64:/usr/lib/llvm/21/lib64:"  lib64/libclangdMain.a  lib64/libclangDaemon.a  lib64/libclangdSupport.a  lib64/libclangTidyAndroidModule.a  lib64/libclangTidyAbseilModule.a  lib64/libclangTidyAlteraModule.a  lib64/libclangTidyBoostModule.a  lib64/libclangTidyCERTModule.a  lib64/libclangTidyConcurrencyModule.a  lib64/libclangTidyDarwinModule.a  lib64/libclangTidyFuchsiaModule.a  lib64/libclangTidyHICPPModule.a  lib64/libclangTidyCppCoreGuidelinesModule.a  lib64/libclangTidyBugproneModule.a  lib64/libclangTidyGoogleModule.a  lib64/libclangTidyLinuxKernelModule.a  lib64/libclangTidyLLVMModule.a  lib64/libclangTidyLLVMLibcModule.a  lib64/libclangTidyMiscModule.a  lib64/libclangIncludeCleaner.a  lib64/libclangTidyModernizeModule.a  lib64/libclangTidyObjCModule.a  lib64/libclangTidyOpenMPModule.a  lib64/libclangTidyPerformanceModule.a  lib64/libclangTidyPortabilityModule.a  lib64/libclangTidyReadabilityModule.a  lib64/libclangTidyZirconModule.a  lib64/libclangTidyMPIModule.a  lib64/libclangTidyUtils.a  lib64/libclangTidy.a  lib64/libclangdRemoteIndex.a  lib64/libclang-cpp.so.21.0gitd1e38eab  /usr/lib/llvm/21/lib64/libLLVM.so.21.0gitd1e38eab && :
Comment 5 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2025-05-06 00:16:34 UTC 
(In reply to zyxhere from comment #4)
> Can't reproduce when doing it on my own here what I did:

Just cd into the build directory and run it as root.
> 
> 
>  : && /usr/bin/x86_64-pc-linux-gnu-g++ -O2 -pipe -flto=auto -fPIC
> -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time
> -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual
> -Wno-missing-field-initializers -Wimplicit-fallthrough -Wno-nonnull
> -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move
> -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment
> -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color
> -ffunction-sections -fdata-sections -fno-common -Woverloaded-virtual
> -fno-strict-aliasing -pedantic -Wno-long-long -Wl,-O1 -Wl,--as-needed
> -Wl,-z,pack-relative-relocs -flto=auto -fuse-ld=mold -Wl,--color-diagnostics
> -Wl,--gc-sections
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> AddUsing.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> AnnotateHighlightings.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> DumpAST.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> DefineInline.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> DefineOutline.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ExpandDeducedType.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ExpandMacro.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ExtractFunction.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ExtractVariable.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> MemberwiseConstructor.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ObjCLocalizeStringLiteral.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ObjCMemberwiseInitializer.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> PopulateSwitch.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> RawStringLiteral.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> RemoveUsingNamespace.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> ScopifyEnum.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> SpecialMembers.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> SwapBinaryOperands.cpp.o
> tools/extra/clangd/refactor/tweaks/CMakeFiles/obj.clangDaemonTweaks.dir/
> SwapIfBranches.cpp.o
> tools/extra/clangd/tool/CMakeFiles/clangd.dir/ClangdToolMain.cpp.o -o
> bin/clangd -L/usr/lib/llvm/21/lib64
> -Wl,-rpath,"\$ORIGIN/../lib64:/var/tmp/portage/llvm-core/clang-21.0.
> 0_pre20250503/work/x/y/clang-abi_x86_64.amd64/lib64:/usr/lib/llvm/21/lib64:"
> lib64/libclangdMain.a  lib64/libclangDaemon.a  lib64/libclangdSupport.a 
> lib64/libclangTidyAndroidModule.a  lib64/libclangTidyAbseilModule.a 
> lib64/libclangTidyAlteraModule.a  lib64/libclangTidyBoostModule.a 
> lib64/libclangTidyCERTModule.a  lib64/libclangTidyConcurrencyModule.a 
> lib64/libclangTidyDarwinModule.a  lib64/libclangTidyFuchsiaModule.a 
> lib64/libclangTidyHICPPModule.a  lib64/libclangTidyCppCoreGuidelinesModule.a
> lib64/libclangTidyBugproneModule.a  lib64/libclangTidyGoogleModule.a 
> lib64/libclangTidyLinuxKernelModule.a  lib64/libclangTidyLLVMModule.a 
> lib64/libclangTidyLLVMLibcModule.a  lib64/libclangTidyMiscModule.a 
> lib64/libclangIncludeCleaner.a  lib64/libclangTidyModernizeModule.a 
> lib64/libclangTidyObjCModule.a  lib64/libclangTidyOpenMPModule.a 
> lib64/libclangTidyPerformanceModule.a  lib64/libclangTidyPortabilityModule.a
> lib64/libclangTidyReadabilityModule.a  lib64/libclangTidyZirconModule.a 
> lib64/libclangTidyMPIModule.a  lib64/libclangTidyUtils.a 
> lib64/libclangTidy.a  lib64/libclangdRemoteIndex.a 
> lib64/libclang-cpp.so.21.0gitd1e38eab 
> /usr/lib/llvm/21/lib64/libLLVM.so.21.0gitd1e38eab && :

Weird. Try prefixing it with sandbox.
Comment 6 Sven B. 2025-05-06 06:02:19 UTC 
Created attachment 927788 [details]
clang 9.1.7 mold failure einfo+log

Tried a build with mold, and get similar results.
Comment 7 zyxhere 2025-05-06 07:06:36 UTC 
(In reply to Sam James from comment #5)
> (In reply to zyxhere from comment #4)
> > Can't reproduce when doing it on my own here what I did:
> 
> Just cd into the build directory and run it as root.
No luck

> Weird. Try prefixing it with sandbox.

How do you do that exactly?
Comment 8 zyxhere 2025-05-06 07:12:43 UTC 
(In reply to Sven B. from comment #6)
> Created attachment 927788 [details]
> clang 9.1.7 mold failure einfo+log
> 
> Tried a build with mold, and get similar results.

Oh interesting my clang-19 and <clang-21.0.0_pre20250503 builds fine

I'll try rebuilding 19 again just in case
Comment 9 zyxhere 2025-05-06 07:50:29 UTC 
(In reply to zyxhere from comment #8)
> (In reply to Sven B. from comment #6)
> > Created attachment 927788 [details]
> > clang 9.1.7 mold failure einfo+log
> > 
> > Tried a build with mold, and get similar results.
> 
> Oh interesting my clang-19 and <clang-21.0.0_pre20250503 builds fine
> 
> I'll try rebuilding 19 again just in case

19 builds fine
Comment 10 Blacktea Hamburger 2025-05-12 14:46:17 UTC 
The crash is reproducible building clang 19.1.7 and 20.1.4 for me.

Please bump mold version to 2.39.1 (as described, fixed a potential use-after-free issue that occurred when doing LTO with LLVM) and see if the crash still exists.
Comment 11 zyxhere 2025-05-12 16:18:38 UTC 
(In reply to Blacktea Hamburger from comment #10)
> The crash is reproducible building clang 19.1.7 and 20.1.4 for me.
> 
> Please bump mold version to 2.39.1 (as described, fixed a potential
> use-after-free issue that occurred when doing LTO with LLVM) and see if the
> crash still exists.

I will shortly (have other stuff to do) tho I will note that these faults were with gcc