c++ class CIS-5

created a new win2016 azure vm. just to do learning on c++. I get segmentation fault running any program, compiles ok. Ok next step is add ram then reinstall cygwin. This worked fine on a azure windows 11.

armadmin@compiler /usr/code
$ gdb a
GNU gdb (GDB) (Cygwin 13.2-1) 13.2
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
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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:
https://www.gnu.org/software/gdb/bugs/.
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For help, type “help”.
Type “apropos word” to search for commands related to “word”…
Reading symbols from a…
(gdb) run
Starting program: /usr/code/a
[New Thread 7036.0xd18]
[New Thread 7036.0xda4]

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) core filename
A program is being debugged already. Kill it? (y or n) n
Program not killed.
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.
[New Thread 7036.0×1300]
0x00007ffe19e03d63 in KERNELBASE!DebugBreak ()
from /cygdrive/c/Windows/System32/KERNELBASE.dll
(gdb) next
Single stepping until exit from function KERNELBASE!DebugBreak,
which has no line number information.
0x00007ffdd6876307 in cygwin1!.assert () from /usr/bin/cygwin1.dll
(gdb) next
Single stepping until exit from function cygwin1!__assert,
which has no line number information.
0x00007ffdd688f42b in secure_getenv () from /usr/bin/cygwin1.dll
(gdb) next
Single stepping until exit from function secure_getenv,
which has no line number information.
0x00007ffe1cb1ab2d in ntdll!.chkstk ()
from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
(gdb) next
Single stepping until exit from function ntdll!__chkstk,
which has no line number information.
0x00007ffe1caa49d3 in ntdll!RtlImageNtHeaderEx ()
from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
(gdb) next
Single stepping until exit from function ntdll!RtlImageNtHeaderEx,
which has no line number information.
0x00007ffe1cb19c9a in ntdll!KiUserExceptionDispatcher ()
from /cygdrive/c/Windows/SYSTEM32/ntdll.dll
(gdb) next
Single stepping until exit from function ntdll!KiUserExceptionDispatcher,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb) next
Single stepping until exit from function cygstdc++-6!_ZNSo6sentryC1ERSo,
which has no line number information.

Thread 1 “a” received signal SIGSEGV, Segmentation fault.
0x00000003fc049cd6 in cygstdc++-6!_ZNSo6sentryC1ERSo ()
from /usr/bin/cygstdc++-6.dll
(gdb)

*****

new host, new cygwin, more memory. now works fine

gdb supposed to look like this:

(gdb) run
Starting program: /usr/code/super
[New Thread 900.0×348]
[New Thread 900.0xb10]
[New Thread 900.0×914]
Hello
[Thread 900.0xfb4 exited with code 0]
[Thread 900.0xb10 exited with code 0]
[Thread 900.0×914 exited with code 0]
[Inferior 1 (process 900) exited normally]
(gdb)

Copyright 2025 Rod Deluhery