Re: [Crash-utility] 7.2.8: Failure when using PPC64 extensions on a PPC64 build from X86_64

Hi, I was trying to debug a PPC64 crash from a X86_64 machine. I got crash (7.2.8) to work with a "make target=PPC64", but when I tried to load an extension I got this error: crash> extend /root/misc/builds/mpykdump-v3.2.1-g4308a70/Extension/mpykdump.so extend: /root/misc/builds/mpykdump-v3.2.1-g4308a70/Extension/mpykdump.so: not an ELF format object file I tried other sample extensions (like dminfo) with the same result. A little debugging shows that "is_shared_object()" is returning FALSE leading to this. Just commenting the call makes the extension work as expected. gdb of is_shared_object(): 3852 } else if ((elf64->e_ident[EI_CLASS] == ELFCLASS64) && (gdb) 3854 switch (swap16(elf64->e_machine, swap)) (gdb) p elf64 $6 = (Elf64_Ehdr *) 0x7fffffffca40 (gdb) p *elf64 $7 = {e_ident = "\177ELF\002\001\001\000\000\000\000\000\000\000\000", e_type = 3, e_machine = 62, e_version = 1, e_entry = 511360, e_phoff = 64, e_shoff = 20379704, e_flags = 0, e_ehsize = 64, e_phentsize = 56, e_phnum = 7, e_shentsize = 64, e_shnum = 31, e_shstrndx = 28} (gdb) p/x *elf64 $8 = {e_ident = {0x7f, 0x45, 0x4c, 0x46, 0x2, 0x1, 0x1, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, e_type = 0x3, e_machine = 0x3e, e_version = 0x1, e_entry = 0x7cd80, e_phoff = 0x40, e_shoff = 0x136f838, e_flags = 0x0, e_ehsize = 0x40, e_phentsize = 0x38, e_phnum = 0x7, e_shentsize = 0x40, e_shnum = 0x1f, e_shstrndx = 0x1c} (gdb) n 3867 if (machine_type("X86_64") || machine_type("ARM64")) (gdb) 3877 if (machine_type("ARM64")) (gdb) 3887 if (CRASHDEBUG(1)) (gdb) p swap $9 = 0 (gdb) p machine_type("X86_64") $10 = 0 (gdb) p machine_type("PPC64") $11 = 1 (gdb) n 3793 return FALSE; It appears like the fix should be something like this (which does fix the issue), but I'd leave it to experts how to fix this correctly: # diff -up symbols.c.org symbols.c --- symbols.c.org 2020-09-02 11:28:33.855265712 -0700 +++ symbols.c 2020-09-02 11:28:36.964274966 -0700 @@ -3864,7 +3864,8 @@ is_shared_object(char *file) break; case EM_X86_64: - if (machine_type("X86_64") || machine_type("ARM64")) + if (machine_type("X86_64") || machine_type("ARM64") || + machine_type("PPC64")) return TRUE; break;