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Subject: Re: Cygwin debugger crashes every time on following a unique_ptr
To: cygwin@cygwin.com
References: <CAECqvgfWPBo0VmYk=EG14vQkK-L7f4zGZ==pv-jSMt31vhavZw@mail.gmail.com>
From: Mark Geisert <mark@maxrnd.com>
Message-ID: <4ffe9ce5-8504-f009-2b19-098bdc9b1aef@maxrnd.com>
Date: Sat, 25 May 2019 14:31:45 -0700
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Raj Kumar wrote:
[...]
> Adding a watch is equivalent to when in the gdb window I try and do
> this: myCar.get()->currentPassengers. This crashes the GDB every time.
> So the issue occurs when I try to follow the object pointed to by a
> unique_ptr and try to get its attributes/variables.

I can confirm this issue.  The fault is reported by Cygwin's memcpy().  I'm 
having a heck of a time trying to get a gdb backtrace to show what in gdb itself 
is likely calling memcpy() with a bad arg.

To reproduce with OP's supplied source files in an otherwise clean directory:
g++ -g -o raj *.cpp
gdb raj
[...]
(gdb) b main
(gdb) run
(gdb) n
(gdb) n

At this point you'll be on line 14.  Issue the OP's triggering command:
(gdb) p myCar.get()->currentPassengers
Segmentation fault (core dumped)

..mark

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