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Program received signal SIGSEGV, Segmentation fault. __stack_split_initialize () at /export/gnu/import/git/sources/gcc/libgcc/config/i386/morestack.S:751 751 leaq -16000(%rsp),%rax # We should have at least 16K. Missing separate debuginfos, use: dnf debuginfo-install libgcc-8.0.1-0.21.0.fc28.x86_64 (gdb) disass Dump of assembler code for function __stack_split_initialize: => 0x0000000000402858 <+0>: lea -0x3e80(%rsp),%rax 0x0000000000402860 <+8>: mov %rax,%fs:0x70 0x0000000000402869 <+17>: sub $0x8,%rsp 0x000000000040286d <+21>: mov %rsp,%rdi 0x0000000000402870 <+24>: mov $0x3e80,%esi 0x0000000000402875 <+29>: callq 0x401810 <__generic_morestack_set_initial_sp> 0x000000000040287a <+34>: add $0x8,%rsp 0x000000000040287e <+38>: retq End of assembler dump. (gdb) This patch adds the missing ENDBR to __stack_split_initialize. PR libgcc/85379 * config/i386/morestack.S (__stack_split_initialize): Add _CET_ENDBR. From-SVN: r259497