https://sourceware.org/bugzilla/show_bug.cgi?id=24168
--- Comment #2 from zhangyn2012 at bupt dot edu.cn --- (In reply to Nick Clifton from comment #1) Hi Nick, > How was the toolchain configured ? Also, were you running these tests > on a 32-bit host or a 64-bit host ? I ran the tests on a 64-bit host. $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.11' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.11) > Are you able to use a debugger to narrow down what is going wrong ? I debugged and found that in the loop of nm.c:983, when j increased to 44, a null pointer dereference is triggered because though it checks r->sym_ptr_ptr is not null, *r->sym_ptr_ptr is a null pointer. nm.c:989 accesses *r->sym_ptr_ptr->section which causes the program to crash. Program received signal SIGSEGV, Segmentation fault. 0x0000000000403b55 in print_symbol (abfd=abfd@entry=0x7172a0, sym=0x71a660, ssiz e=ssize@entry=0, archive_bfd=archive_bfd@entry=0x0) at nm.c:989 1: j = 44 2: r->sym_ptr_ptr = (struct bfd_symbol **) 0x71a8a8 3: *r->sym_ptr_ptr = (struct bfd_symbol *) 0x0 -- You are receiving this mail because: You are on the CC list for the bug. _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
