[Bug binutils/28844] New: ld (bfd) segfaults on building efivar-38 with -flto

[sam at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28844

            Bug ID: 28844
           Summary: ld (bfd) segfaults on building efivar-38 with -flto
           Product: binutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: sam at gentoo dot org
  Target Milestone: ---

Created attachment 13944
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13944&action=edit
build.log

Originally reported downstream in Gentoo here: https://bugs.gentoo.org/831366.

Snippet from build log:
```
x86_64-pc-linux-gnu-gcc -O2 -flto     -ggdb3 -std=gnu11 -funsigned-char
-fvisibility=hidden
-specs=/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/gcc.specs
-fno-merge-constants  -std=gnu11 -funsigned-char -fvisibility=hidden
-specs=/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/gcc.specs
-fno-merge-constants  -L. -O2 -flto     -ggdb3 -std=gnu11 -funsigned-char
-fvisibility=hidden
-specs=/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/gcc.specs
-fno-merge-constants  -L. -Wl,-O1 -Wl,--as-needed
-Wl,--defsym=__gentoo_check_ldflags__=0  -Wl,--add-needed -Wl,--build-id
-Wl,--no-allow-shlib-undefined -Wl,--no-undefined-version -Wl,-z,now
-Wl,-z,muldefs -Wl,-z,relro -Wl,--fatal-warnings     -Wl,--add-needed
-Wl,--build-id -Wl,--no-allow-shlib-undefined -Wl,--no-undefined-version
-Wl,-z,now -Wl,-z,muldefs -Wl,-z,relro -Wl,--fatal-warnings    
-DLIBEFIVAR_VERSION=38 -D_GNU_SOURCE
-I/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/  -shared
-Wl,-soname,libefivar.so.1 -Wl,--version-script=libefivar.map  \
        -T guids.lds \
        -o libefivar.so crc32.o dp.o dp-acpi.o dp-hw.o dp-media.o dp-message.o
efivarfs.o error.o export.o guid.o guid-symbols.o lib.o vars.o time.o -ldl
x86_64-pc-linux-gnu-gcc -O2 -flto     -ggdb3 -std=gnu11 -funsigned-char
-fvisibility=hidden
-specs=/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/gcc.specs
-fno-merge-constants  -std=gnu11 -funsigned-char -fvisibility=hidden
-specs=/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/gcc.specs
-fno-merge-constants  -L. -O2 -flto     -ggdb3 -std=gnu11 -funsigned-char
-fvisibility=hidden
-specs=/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/gcc.specs
-fno-merge-constants  -L. -Wl,-O1 -Wl,--as-needed
-Wl,--defsym=__gentoo_check_ldflags__=0  -Wl,--add-needed -Wl,--build-id
-Wl,--no-allow-shlib-undefined -Wl,--no-undefined-version -Wl,-z,now
-Wl,-z,muldefs -Wl,-z,relro -Wl,--fatal-warnings     -Wl,--add-needed
-Wl,--build-id -Wl,--no-allow-shlib-undefined -Wl,--no-undefined-version
-Wl,-z,now -Wl,-z,muldefs -Wl,-z,relro -Wl,--fatal-warnings    
-DLIBEFIVAR_VERSION=38 -D_GNU_SOURCE
-I/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/  -shared
-Wl,-soname,libefisec.so.1 -Wl,--version-script=libefisec.map  \
         \
        -o libefisec.so sec.o secdb.o esl-iter.o util.o
ln -vfs libefisec.so libefisec.so.1
'libefisec.so.1' -> 'libefisec.so'
collect2: fatal error: ld terminated with signal 11 [Segmentation fault], core
dumped
compilation terminated.
make[1]: ***
[/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src/include/rules.mk:39:
libefivar.so] Error 1
rm thread-test.o
make[1]: Leaving directory
'/var/tmp/portage/sys-libs/efivar-38/work/efivar-38/src'
make: *** [Makefile:14: all] Error 2
 * ERROR: sys-libs/efivar-38::gentoo failed (compile phase):
 *   emake failed
```

I'm trying to figure out how I can actually get the coredump or a backtrace
given that one doesn't seem to be created (nor does coredumpctl show one). gdb
doesn't pick one up either, I guess due to the indirection with gcc->ld?

Versions:
- Gentoo Linux
- gcc (Gentoo Hardened 11.2.1_p20220115 p4) 11.2.1 20220115
- GNU ld (Gentoo 2.37_p1 p2) 2.37

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