Date: Sun, 14 Jan 2018 07:57:01 -0800 From: Chuck Tuffli <chuck@tuffli.net> To: freebsd-hackers@freebsd.org Subject: examining Linux core file? Message-ID: <CAM0tzX1GNvO%2BKWTi5=08C=uyeH3BKtWY=01RKXoM79t%2BzwR9Tg@mail.gmail.com>
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If a Linux application running under the Linux emulation (a.k.a. Linuxulator) core dumps, is it possible to examine the resulting core file? lldb didn't seem to like it: # file mremap05.core mremap05.core: ELF 64-bit LSB core file x86-64, version 1 (FreeBSD), FreeBSD-style, from 'ases/bin/mremap05' # lldb -c mremap05.core testcases/bin/mremap05 (lldb) target create "testcases/bin/mremap05" --core "mremap05.core" error: Unable to find process plug-in for core file '/compat/linux/opt/ltp/mremap05.core' (lldb) bt error: invalid process FreeBSD's gdb seems to recognize this is as Linux, but doesn't know where to go from there: # /usr/libexec/gdb -q ./testcases/bin/mremap05 mremap05.core warning: A handler for the OS ABI "GNU/Linux" is not built into this configuration of GDB. Attempting to continue with the default i386:x86-64 settings. Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /compat/linux/opt/ltp/testcases/bin/mremap05] warning: core file may not match specified executable file. Core was generated by `./testcases/bin/mremap05'. Program terminated with signal 11, Segmentation fault. #0 0x0040eb01 in ?? () (gdb) bt #0 0x0040eb01 in ?? () Cannot access memory at address 0xdbea00 The gdb from CentOS, on the other hand, seems to think this is a FreeBSD core: # gdb -q ./testcases/bin/mremap05 mremap05.core Reading symbols from /opt/ltp/testcases/bin/mremap05...done. warning: A handler for the OS ABI "FreeBSD ELF" is not built into this configuration of GDB. Attempting to continue with the default i386:x86-64 settings. "/opt/ltp/mremap05.core": no core file handler recognizes format Are there any other approaches to consider? TIA. --chuck
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