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And it does not work. > > So I reduced the problem to this minimal test case: > > $ cat a.c > #include > > int main() > { > abort(); > } > > $ gcc -Wall -g a.c > > $ echo $CYGWIN > error_start=c:\cygwin64\bin\dumper.exe > > $ ulimit -a > core file size (blocks, -c) unlimited > data seg size (kbytes, -d) unlimited > file size (blocks, -f) unlimited > open files (-n) 3200 > pipe size (512 bytes, -p) 8 > stack size (kbytes, -s) 2036 > cpu time (seconds, -t) unlimited > max user processes (-u) 256 > virtual memory (kbytes, -v) unlimited > > $ ./a > *** starting debugger for pid 19934, tid 9332 > > $ ls -l a.* > -rw-r--r-- 1 ANTON None 49 Jul 8 17:40 a.c > -rwxr-xr-x 1 ANTON None 161487 Jul 8 17:41 a.exe* > -rw-r--r-- 1 ANTON None 3331640 Jul 8 17:46 a.exe.core > > $ file a.* > a.c: C source, ASCII text > a.exe: PE32+ executable (console) x86-64, for MS Windows > a.exe.core: ELF 64-bit LSB core file, x86-64, version 1 (SYSV) > > BUT: gdb does not want this core file: > > $ gdb ./a.exe a.exe.core > GNU gdb (GDB) (Cygwin 9.2-1) 9.2 > Copyright (C) 2020 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. > Type "show copying" and "show warranty" for details. > This GDB was configured as "x86_64-pc-cygwin". > Type "show configuration" for configuration details. > For bug reporting instructions, please see: > . > Find the GDB manual and other documentation resources online at: > . > > For help, type "help". > Type "apropos word" to search for commands related to "word"... > Reading symbols from ./a.exe... > "/home/ANTON/a.exe.core": no core file handler recognizes format > (gdb) > > What I am doing wrong? Try using a more recent gdb. I just tried your test case with gdb-12.1-1 (available as a test release), and it seemed to work. Ken