Can't see symbols from Erlang NIF library in core file
Attila Rajmund Nohl <[email protected]>
| Newsgroups | gmane.comp.lang.erlang.general |
|---|---|
| Message-ID | <CAFkcMa_2Eyxff6=T6C5dRZmHdUwREM91fNGPkPkwF8TKe2FpHg@mail.gmail.com> |
Hello! I'm working on an Erlang wrapper over a 3rd party C library on Ubuntu Linux on x86, so I'm creating a NIF. Sometimes my code (I think) crashes, resulting in a core file. Unfortunately the stacktrace is not really helpful: (gdb) bt #0 0x00007fc22229968a in ?? () #1 0x0000000060e816d8 in ?? () #2 0x0000000007cd48b0 in ?? () #3 0x00007fc228031410 in ?? () #4 0x00007fc228040b80 in ?? () #5 0x00007fc228040c50 in ?? () #6 0x00007fc22223de0b in ?? () #7 0x0000000000000000 in ?? () even though I built my NIF .so file with debug info: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=b70dd1f2450f5c0e9980c8396aaad2e1cd29024c, with debug_info, not stripped The beam binary also has debug info: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=e0a5dba6507b8c2b333faebc89fbc6ea2f7263b9, for GNU/Linux 3.2.0, with debug_info, not stripped However, info sharedlibrary doesn't show neither the NIF nor the 3rd party lib: (gdb) info sharedlibrary From To Syms Read Shared Object Library 0x00007fc28942ed50 0x00007fc289432004 Yes /lib/x86_64-linux-gnu/libgtk3-nocsd.so.0 0x00007fc289429220 0x00007fc28942a179 Yes /lib/x86_64-linux-gnu/libdl.so.2 0x00007fc2892e83c0 0x00007fc28938ef18 Yes /lib/x86_64-linux-gnu/libm.so.6 0x00007fc2892b76a0 0x00007fc2892c517c Yes /lib/x86_64-linux-gnu/libtinfo.so.6 0x00007fc28928dae0 0x00007fc28929d4d5 Yes /lib/x86_64-linux-gnu/libpthread.so.0 0x00007fc2890b9630 0x00007fc28922e20d Yes /lib/x86_64-linux-gnu/libc.so.6 0x00007fc289657100 0x00007fc289679674 Yes (*) /lib64/ld-linux-x86-64.so.2 0x00007fc24459c040 0x00007fc2445ab8ad Yes /home/nar/otp/23.3.4.2/lib/crypto-4.9.0.2/priv/lib/crypto.so 0x00007fc2239e3000 0x00007fc223b7c800 Yes (*) /lib/x86_64-linux-gnu/libcrypto.so.1.1 0x00007fc2896500e0 0x00007fc28965028c Yes /home/nar/otp/23.3.4.2/lib/crypto-4.9.0.2/priv/lib/crypto_callback.so 0x00007fc289649380 0x00007fc28964bc1c Yes /home/nar/otp/23.3.4.2/lib/asn1-5.0.15/priv/lib/asn1rt_nif.so 0x00007fc289638720 0x00007fc28963bd70 Yes /lib/x86_64-linux-gnu/librt.so.1 I found an answer at stackoverflow (https://stackoverflow.com/a/32727752/2414208) mentioning that "The Erlang VM doesn't load NIF libraries with global symbols exposed". Could this be the reason why I don't see the symbols? Is there a way to tell gdb to look up symbols from my .so file?