https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97290
Bug ID: 97290
Summary: Segmentation fault in lto-wrapper
Product: gcc
Version: 10.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: markus.rothe at rite dot cc
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Hello, I get a segmentation fault when building RPMs for the AWS SDK for C++ on
Fedora 33. This version of Fedora enables LTO by default, previous versions did
not use LTO by default. So there are several layers that I had to peal apart in
order to come up with what I can show you below. I welcome any suggestions on
how to debug this problem further.
Within the cmake based build process, lto-wrapper is called and it segfaults.
To reproduce, I did the following on a Fedora 33 machine:
[ Warning, ub_EC2.cpp.o is about 700MB large. ]
$ gcc --version
gcc (GCC) 10.2.1 20200826 (Red Hat 10.2.1-3)
Copyright (C) 2020 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ mkdir -p reproduce-tmp/CMakeFiles/aws-cpp-sdk-ec2.dir/
$ cd reproduce-tmp/
$ curl -o CMakeFiles/aws-cpp-sdk-ec2.dir/
https://files.markus289.com/aifoo3/ub_EC2.cpp.o
$ curl -o -lm.res https://files.markus289.com/aifoo3/-lm.res
$ tree
.
├── -lm.res
└── CMakeFiles
└── aws-cpp-sdk-ec2.dir
└── ub_EC2.cpp.o
2 directories, 2 files
$ gdb
[...]
(gdb) set environment COLLECT_GCC=/usr/bin/g++
(gdb) set environment
COMPILER_PATH="/usr/libexec/gcc/x86_64-redhat-linux/10/:/usr/libexec/gcc/x86_64-redhat-linux/10/:/usr/libexec/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/10/:/usr/lib/gcc/x86_64-redhat-linux/:/usr/libexec/gcc/x86_64-redhat-linux/10/:/usr/libexec/gcc/x86_64-redhat-linux/10/:/usr/libexec/gcc/x86_64-redhat-linux/:/usr/lib/gcc/x86_64-redhat-linux/10/:/usr/lib/gcc/x86_64-redhat-linux/"
(gdb) set environment
LIBRARY_PATH="/usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64/../lib64/:/lib/../lib64/../lib64/:/usr/lib/../lib64/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/10/:/usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/10/:/usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-redhat-linux/10/../../../:/lib/:/usr/lib/:/usr/lib/gcc/x86_64-redhat-linux/10/../../../:/lib/:/usr/lib/"
(gdb) set environment COLLECT_GCC_OPTIONS="-c -fno-openmp -fno-openacc -g -O2
-fPIC -O2 -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe
-Werror=format-security -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64
-mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -shared -pthread -v -save-temps
-shared-libgcc -march=x86-64 -dumpdir ./ -dumpbase libaws-cpp-sdk-ec2.so.wpa
-fltrans-output-list=libaws-cpp-sdk-ec2.so.ltrans.out -fwpa=12
-fresolution=-lm.res -flinker-output=dyn -shared-libgcc"
(gdb) file /usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper
Reading symbols from /usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper...
Reading symbols from
/usr/lib/debug/usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper-10.2.1-3.fc33.x86_64.debug...
(gdb) set args -fresolution=-lm.res -flinker-output=dyn
CMakeFiles/aws-cpp-sdk-ec2.dir/ub_EC2.cpp.o
(gdb) run
Starting program: /usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper
-fresolution=-lm.res -flinker-output=dyn
CMakeFiles/aws-cpp-sdk-ec2.dir/ub_EC2.cpp.o
[Detaching after vfork from child process 109]
Program received signal SIGSEGV, Segmentation fault.
0x0043b314 in simple_object_elf_copy_lto_debug_sections (sobj=0x52b740,
dobj=0x52b7d0, pfn=, err=0x7fffdbf8)
at ../../libiberty/simple-object-elf.c:1515
1515ELF_SET_FIELD (type_functions, ei_class, Sym,
(gdb) bt
#0 0x0043b314 in simple_object_elf_copy_lto_debug_sections
(sobj=0x52b740, dobj=0x52b7d0, pfn=, err=0x7fffdbf8)
at ../../libiberty/simple-object-elf.c:1515
#1 0x00439865 in simple_object_copy_lto_debug_sections (sobj=0x52b740,
dest=0x52b770 "/tmp/ccYbFOK9.debug.temp.o",
err=0x7fffdbf8, rename=1) at ../../libiberty/simple-object.c:352
#2 0x004562c7 in debug_objcopy (infile=,
rename=rename@entry=true) at ../../gcc/lto-wrapper.c:1127
#3 0x0045857f in run_gcc (argc=, argv=)
at ../../gcc/lto-wrapper.c:1736
#4 0x0043e577 in main (argc=, argv=) at
../../gcc/lto-wrapper.c:1998
(gdb)
The error happens in the following line of code in
libiberty/simple-object-elf.c:1515:
ELF_SET_FIELD (type_functions, ei_class, Sym, ent, st_
