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Subject:	Re: cygwin gfortran segfaulting on valid write statements
To:	cygwin cygwin <cygwin AT cygwin DOT com>
References:	<d04d793a-6c8b-7a11-5a9b-5cda1bb86e50 DOT ref AT bellsouth DOT net>
	<d04d793a-6c8b-7a11-5a9b-5cda1bb86e50 AT bellsouth DOT net>
	<e7cdd735-aa29-b255-e643-eb35e5f6693d AT SystematicSw DOT ab DOT ca>
From:	Charles Russell <worsafe AT bellsouth DOT net>
Message-ID:	<af654c15-29f0-144c-9d5b-d49e41713c0b@bellsouth.net>
Date:	Fri, 17 Apr 2020 18:33:42 -0500
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On 4/17/2020 2:46 PM, Brian Inglis wrote:

> Try running under strace:
> 
> 	$ strace -o prog.strace prog -options... args...
> 
> or gdb:
> 
> 	$ gdb prog
> 	(gdb) run -options... args...
> 	SEGV diagnostics
> 	(gdb) bt
> 	(gdb) q
> 
> and attach or paste all output.

The following is the case where I got an error message. Not actually a 
segfault. (Sorry, I'm not a programmer.) The executable, gdb, and strace 
all produce the same output:
-----------
At line 889 of file cgcrez.f (unit = 6, file = 'stdout')
Fortran runtime error: Missing initial left parenthesis in format

^

Error termination. Backtrace:
#0  0xffffffffffffffff in ???
#1  0xffffffffffffffff in ???
#2  0xffffffffffffffff in ???
#3  0xffffffffffffffff in ???
#4  0xffffffffffffffff in ???
#5  0xffffffffffffffff in ???
#6  0xffffffffffffffff in ???
#7  0xffffffffffffffff in ???
#8  0xffffffffffffffff in ???
#9  0xffffffffffffffff in ???
#10  0xffffffffffffffff in ???
#11  0xffffffffffffffff in ???
#12  0xffffffffffffffff in ???
#13  0xffffffffffffffff in ???
--------------
Here is the indicated line, using list mode in vim to show that there 
are no unexpected nonprinting characters:

  887           write(6,'(i6,1p3e9.2,x,e9.2,x,0pf6.3,x,1p2e10.2,''@'')')$
  888      &       iter, reldf,reldb,$
  889      &       gnorms, x1min, -cosag, beta(1),beta(np)$
  890 $

This code compiled and ran on cygwin in the past, and checks out now in 
debian stable.

In my other case, which I may or may not be able to find again, the 
program failed with no explicit error message like the one above. 
Stepping through with gdb showed that it was also crashing in a valid 
write statement.




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