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Date:	Fri, 8 Nov 2019 10:08:23 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Stack trace question
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On Nov  8 05:55, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin wrote:
> Hi all,
>=20
> I have the following stack trace (64 bit Cygwin app), and I can't
> figure how the same frame RBP at 000FFFFC7B0 can be listed 3
> consecutive times for various functions (RIPs).

The functions in question are signal handling stuff, partially written in
assembler.  They don't change $rbp at all.

> Also if I follow the
> stack trace with gdb (and the trace is all within Cygwin.dll based at
> 180040000), it does not make any sense (it was a simple abort() in the
> application due to some external condition; no segfault or any other
> nasty kind of stuff)...  The program does not use SYSV IPC at all (so
> the appearance of shmat() is highly suspicious).
>=20
> Can there be something wrong as to how the stack trace gets generated?

If so, I'm not aware of that.  Cygwin uses the ntdll RtlVirtualUnwind and
RtlLookupFunctionEntry functions on 64 bit to iterate over the stack.

One problem in your stackdump may be that, apparently, a longjmp has
been performed (sigsetjmp is on the stack which is weird anyway).  Stuff
like that *may* indicate that the stack is broken.


Corinna

--=20
Corinna Vinschen
Cygwin Maintainer

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