RE: bug#39118: Segfault while building on 64-bit Cygwin

RE: bug#39118: Segfault while building on 64-bit Cygwin

[dsmich]

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Pretty sure that the missing readline symbol is because the macos
readline is being used/found instead of GNU readline.

	-Dale

	-----------------------------------------From: "John Cowan" 
To: "Ludovic Courtès"
Cc: 39118@debbugs.gnu.org, guile-devel@gnu.org
Sent: Friday January 24 2020 9:36:59AM
Subject: bug#39118: Segfault while building on 64-bit Cygwin

Both Cygwin and MacOS crash in pretty much the same way. By disabling
the JIT, I was able to get the Cygwin build to run to completion. On
MacOS with --disable-jit, however, I am now getting an entirely new
failure:
 CC readline.lo
readline.c:432:7: warning: implicitly declaring library function
'strncmp' with type 'int (const char *, const char *,
 unsigned long)' [-Wimplicit-function-declaration]
 if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
 ^
readline.c:432:7: note: include the header  or explicitly provide a
declaration for 'strncmp'
readline.c:432:16: warning: implicit declaration of function
'rl_get_keymap_name' is invalid in C99
 [-Wimplicit-function-declaration]
 if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
 ^
readline.c:432:16: warning: incompatible integer to pointer conversion
passing 'int' to parameter of type 'const char *'
 [-Wint-conversion]
 if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 warnings generated.
 CCLD guile-readline.la [1]
Undefined symbols for architecture x86_64:
 "_rl_get_keymap_name", referenced from:
 _scm_init_readline in readline.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

On Thu, Jan 23, 2020 at 3:35 PM Ludovic Courtès  wrote:
Hi,

 John Cowan  skribis:

 > Thanks. Unfortunately, the standard recipe for making core dumps on
Mac

 This bug report is about Cygwin, not macOS, right? :-)

 Ludo’.
  

Links:
------
[1] http://guile-readline.la
[2] mailto:ludo@gnu.org
[3] mailto:cowan@ccil.org


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GNU Guile 2.9.9 Released [beta]

[Andy Wingo]

We are pleased to announce GNU Guile release 2.9.9.  This is the ninfth
and probably final pre-release of what will eventually become the 3.0
release series.

Compared to the current stable series (2.2.x), the future Guile 3.0 adds
support for just-in-time native code generation, speeding up all Guile
programs.  See the NEWS extract at the end of the mail for full details.

Compared to the previous prerelease (2.9.7), Guile 2.9.8 fixes a number
of bugs.

The current plan is to make a 3.0.0 final release on 17 January 2020.
If there's nothing wrong with this prerelease, 3.0.0 will be essentially
identical to 2.9.9.  With that in mind, please test and make sure the
release works on your platform!  Please send any build reports (success
or failure) to guile-devel@gnu.org, along with platform details.  You
can file a bug by sending mail to bug-guile@gnu.org.

The Guile web page is located at http://gnu.org/software/guile/, and
among other things, it contains a copy of the Guile manual and pointers
to more resources.

Guile is an implementation of the Scheme programming language, packaged
for use in a wide variety of environments.  In addition to implementing
the R5RS, R6RS, and R7RS Scheme standards, Guile includes a module
system, full access to POSIX system calls, networking support, multiple
threads, dynamic linking, a foreign function call interface, powerful
string processing, and HTTP client and server implementations.

Guile can run interactively, as a script interpreter, and as a Scheme
compiler to VM bytecode.  It is also packaged as a library so that
applications can easily incorporate a complete Scheme interpreter/VM.
An application can use Guile as an extension language, a clean and
powerful configuration language, or as multi-purpose "glue" to connect
primitives provided by the application.  It is easy to call Scheme code
From C code and vice versa.  Applications can add new functions, data
types, control structures, and even syntax to Guile, to create a
domain-specific language tailored to the task at hand.

Guile 2.9.9 can be installed in parallel with Guile 2.2.x; see
http://www.gnu.org/software/guile/manual/html_node/Parallel-Installations.html.

A more detailed NEWS summary follows these details on how to get the
Guile sources.

Here are the compressed sources:
  http://alpha.gnu.org/gnu/guile/guile-2.9.9.tar.lz   (10MB)
  http://alpha.gnu.org/gnu/guile/guile-2.9.9.tar.xz   (12MB)
  http://alpha.gnu.org/gnu/guile/guile-2.9.9.tar.gz   (21MB)

Here are the GPG detached signatures[*]:
  http://alpha.gnu.org/gnu/guile/guile-2.9.9.tar.lz.sig
  http://alpha.gnu.org/gnu/guile/guile-2.9.9.tar.xz.sig
  http://alpha.gnu.org/gnu/guile/guile-2.9.9.tar.gz.sig

Use a mirror for higher download bandwidth:
  http://www.gnu.org/order/ftp.html

Here are the SHA256 checksums:

  59f136e5db36eba070cc5e68784e632dc2beae4b21fd6c7c8ed2c598cc992efc  guile-2.9.9.tar.lz
  bf71920cfa23e59fc6257bee84ef4dfeccf4f03e96bb8205592e09f9dbff2969  guile-2.9.9.tar.xz
  eafe394cf99d9dd1ab837e6d1b9b2b8d9f0cd13bc34e64ca92456ce1bc2b1925  guile-2.9.9.tar.gz

[*] Use a .sig file to verify that the corresponding file (without the
.sig suffix) is intact.  First, be sure to download both the .sig file
and the corresponding tarball.  Then, run a command like this:

  gpg --verify guile-2.9.9.tar.gz.sig

If that command fails because you don't have the required public key,
then run this command to import it:

  gpg --keyserver keys.gnupg.net --recv-keys 4FD4D288D445934E0A14F9A5A8803732E4436885

and rerun the 'gpg --verify' command.

This release was bootstrapped with the following tools:
  Autoconf 2.69
  Automake 1.16.1
  Libtool 2.4.6
  Gnulib v0.1-1157-gb03f418
  Makeinfo 6.7

An extract from NEWS follows.


Changes since alpha 2.9.8 (since 2.9.7):

* Notable changes

** `define-module' #:autoload no longer pulls in the whole module

One of the ways that a module can use another is "autoloads".  For
example:

  (define-module (a) #:autoload (b) (make-b))

In this example, module `(b)' will only be imported when the `make-b'
identifier is referenced.  However besides the imprecision about when a
given binding is actually referenced, this mechanism used to cause the
whole imported module to become available, not just the specified
bindings.  This has now been changed to only import the specified bindings.

This is a backward-incompatible change.  The fix is to mention all
bindings of interest in the autoload clause.  Feedback is welcome.

** `guard' no longer unwinds the stack for clause tests

SRFI-34, and then R6RS and R7RS, defines a `guard' form that is a
shorthand for `with-exception-handler'.  The cond-like clauses for the
exception handling are specified to run with the continuation of the
`guard', while any re-propagation of the exception happens with the
continuation of the original `raise'.

In practice, this means that one needs full `call-with-continuation' to
implement the specified semantics, to be able to unwind the stack to the
cond clauses, then rewind if none match.  This is not only quite
expensive, it is also error-prone as one usually doesn't want to rewind
dynamic-wind guards in an exceptional situation.  Additionally, as
continuations bind tightly to the current thread, it makes it impossible
to migrate a subcomputation with a different thread if a `guard' is live
on the stack, as is done in Fibers.

Guile now works around these issues by running the test portion of the
guard expressions within the original `raise' continuation, and only
unwinding once a test matches.  This is an incompatible semantic change
but we think the situation is globally much better, and we expect that
very few people will be affected by the change.

** Improve SRFI-43 vector-fill!

SRFI-43 vector-fill! now has the same performance whether an optional
range is provided or not, and is also provided in core.  As a side
effect, vector-fill! and vector_fill_x no longer work on non-vector
rank-1 arrays.  Such cases were handled incorrectly before; for example,
prior to this change:

  (define a (make-vector 10 'x))
  (define b (make-shared-array a (lambda (i) (list (* 2 i))) 5))
  (vector-fill! b 'y)

  => #1(y y y x x)

This is now an error.  Instead, use array-fill!.

** Fix compilation on 32-bit targets

A compile error introduced in 2.9.3 prevented compilation on 32-bit
targets.  This has been fixed.

** Fix a bug in closure conversion

Thanks for Stefan Israelsson Tampe for the report.

** Fix omission in R7RS support

Somewhat embarrassingly, the R7RS support added earlier in 2.9 failed to
include an implementation of `define-library'.  This oversight has been
corrected :)

** Optionally allow duplicate field names in core records

See the new #:allow-duplicate-field-names? keyword argument to
`make-record-type' in the manual, for more.  This restores a needed
feature to R6RS records.

** Fix default value of thread-local fluids

Before, `fluid-ref' on an unbound thread-local fluid was returning #f
instead of the default value of the fluid.  Thanks to Rob Browning for
the fix!


\f
Changes in alpha 2.9.x (since the stable 2.2 series):

* Notable changes

** Just-in-time code generation

Guile programs now run up to 4 times faster, relative to Guile 2.2,
thanks to just-in-time (JIT) native code generation.  Notably, this
brings the performance of "eval" as written in Scheme back to the level
of "eval" written in C, as in the days of Guile 1.8.

See "Just-In-Time Native Code" in the manual, for more information.  JIT
compilation will be enabled automatically and transparently.  To disable
JIT compilation, configure Guile with `--enable-jit=no' or
`--disable-jit'.  The default is `--enable-jit=auto', which enables the
JIT if it is available.  See `./configure --help' for more.

JIT compilation is enabled by default on x86-64, i686, ARMv7, and
AArch64 targets.

** Lower-level bytecode

Relative to the virtual machine in Guile 2.2, Guile's VM instruction set
is now more low-level.  This allows it to express more advanced
optimizations, for example type check elision or integer
devirtualization, and makes the task of JIT code generation easier.

Note that this change can mean that for a given function, the
corresponding number of instructions in Guile 3.0 may be higher than
Guile 2.2, which can lead to slowdowns when the function is interpreted.
We hope that JIT compilation more than makes up for this slight
slowdown.

** Interleaved internal definitions and expressions allowed

It used to be that internal definitions had to precede all expressions
in their bodies.  This restriction has been relaxed.  If an expression
precedes an internal definition, it is treated as if it were a
definition of an unreferenced variable.  For example, the expression
`(foo)' transforms to the equivalent of `(define _ (begin (foo) #f))',
if it precedes other definitions.

This change improves the readability of Guile programs, as it used to be
that program indentation tended to increase needlessly to allow nested
`let' and `letrec' to re-establish definition contexts after initial
expressions, for example for type-checks on procedure arguments.

** Record unification

Guile used to have a number of implementations of structured data types
in the form of "records": a core facility, SRFI-9 (records), SRFI-35
(condition types -- a form of records) and R6RS records.  These
facilities were not compatible, as they all were built in different
ways.  This had the unfortunate corollary that SRFI-35 conditions were
not compatible with R6RS conditions.  To fix this problem, we have now
added the union of functionality from all of these record types into
core records: single-inheritance subtyping, mutable and immutable
fields, and so on.  See "Records" in the manual, for full details.

R6RS records, SRFI-9 records, and the SRFI-35 and R6RS exception types
have been accordingly "rebased" on top of core records.

** Reimplementation of exceptions

Since Guile's origins 25 years ago, `throw' and `catch' have been the
primary exception-handling primitives.  However these primitives have
two problems.  One is that it's hard to handle exceptions in a
structured way using `catch'.  Few people remember what the
corresponding `key' and `args' are that an exception handler would see
in response to a call to `error', for example.  In practice, this
results in more generic catch-all exception handling than one might
like.

The other problem is that `throw', `catch', and especially
`with-throw-handler' are quite unlike what the rest of the Scheme world
uses.  R6RS and R7RS, for example, have mostly converged on
SRFI-34-style `with-exception-handler' and `raise' primitives, and
encourage the use of SRFI-35-style structured exception objects to
describe the error.  Guile's R6RS layer incorporates an adapter between
`throw'/`catch' and structured exception handling, but it didn't apply
to SRFI-34/SRFI-35, and we would have to duplicate it for R7RS.

In light of these considerations, Guile has now changed to make
`with-exception-handler' and `raise-exception' its primitives for
exception handling and defined a hierarchy of R6RS-style exception types
in its core.  SRFI-34/35, R6RS, and the exception-handling components of
SRFI-18 (threads) have been re-implemented in terms of this core
functionality.  There is also a a compatibility layer that makes it so
that exceptions originating in `throw' can be handled by
`with-exception-hander', and vice-versa for `raise-exception' and
`catch'.

Generally speaking, users will see no difference.  The one significant
difference is that users of SRFI-34 will see more exceptions flowing
through their `with-exception-handler'/`guard' forms, because whereas
before they would only see exceptions thrown by SRFI-34, now they will
see exceptions thrown by R6RS, R7RS, or indeed `throw'.

Guile's situation is transitional.  Most exceptions are still signalled
via `throw'.  These will probably migrate over time to
`raise-exception', while preserving compatibility of course.

See "Exceptions" in the manual, for full details on the new API.

** Optimization of top-level bindings within a compilation unit

At optimization level 2 and above, Guile's compiler is now allowed to
inline top-level definitions within a compilation unit.  See
"Declarative Modules" in the manual, for full details.  This change can
improve the performance of programs with many small top-level
definitions by quite a bit!

At optimization level 3 and above, Guile will assume that any top-level
binding in a declarative compilation unit that isn't exported from a
module can be completely inlined into its uses.  (Prior to this change,
-O3 was the same as -O2.)  Note that with this new
`seal-private-bindings' pass, private declarative bindings are no longer
available for access from the first-class module reflection API.  The
optimizations afforded by this pass can be useful when you need a speed
boost, but having them enabled at optimization level 3 means they are
not on by default, as they change Guile's behavior in ways that users
might not expect.

** By default, GOOPS classes are not redefinable

It used to be that all GOOPS classes were redefinable, at least in
theory.  This facility was supported by an indirection in all "struct"
instances, even though only a subset of structs would need redefinition.
We wanted to remove this indirection, in order to speed up Guile
records, allow immutable Guile records to eventually be described by
classes, and allow for some optimizations in core GOOPS classes that
shouldn't be redefined anyway.

Thus in GOOPS now there are classes that are redefinable and classes
that aren't.  By default, classes created with GOOPS are not
redefinable.  To make a class redefinable, it should be an instance of
`<redefinable-class>'.  See "Redefining a Class" in the manual for more
information.

** Define top-level bindings for aux syntax: `else', `=>', `...', `_'

These auxiliary syntax definitions are specified to be defined in the
R6RS and the R7RS.  They were previously unbound, even in the R6RS
modules.  This change is not anticipated to cause any incompatibility
with existing Guile code, and improves things for R6RS and R7RS users.

** Conventional gettext alias is now `G_'

Related to the last point, since the "Fix literal matching for
module-bound literals" change in the 2.2 series, it was no longer
possible to use the conventional `_' binding as an alias for `gettext',
because a local `_' definition would prevent `_' from being recognized
as auxiliary syntax for `match', `syntax-rules', and similar.  The new
recommended conventional alias for `gettext' is `G_'.

** Add --r6rs command-line option

The new `install-r6rs!' procedure adapts Guile's defaults to be more
R6RS-compatible.  This procedure is called if the user passes `--r6rs'
as a command-line argument.  See "R6RS Incompatibilities" in the manual,
for full details.

** Add support for R7RS

Thanks to Göran Weinholt and OKUMURA Yuki, Guile now implements the R7RS
modules.  As the R7RS library syntax is a subset of R6RS, to use R7RS
you just `(import (scheme base))' and off you go.  As with R6RS also,
there are some small lexical incompatibilities regarding hex escapes;
see "R6RS Support" in the manual, for full details.

Also as with R6RS, there is an `install-r7rs!' procedure and a `--r7rs'
command-line option.

** Add #:re-export-and-replace argument to `define-module'

This new keyword specifies a set of bindings to re-export, but also
marks them as intended to replace core bindings.  See "Creating Guile
Modules" in the manual, for full details.

Note to make this change, we had to change the way replacement flags are
stored, to being associated with modules instead of individual variable
objects.  This means that users who #:re-export an imported binding that
was already marked as #:replace by another module will now see warnings,
as they need to use #:re-export-and-replace instead.

** `iota' in core and SRFI-1 `iota' are the same

Previously, `iota' in core would not accept start and step arguments and
would return an empty list for negative count. Now there is only one
`iota' function with the extended semantics of SRFI-1.  Note that as an
incompatible change, core `iota' no longer accepts a negative count.

* New deprecations

** scm_t_uint8, etc deprecated in favor of C99 stdint.h

It used to be that Guile defined its own `scm_t_uint8' because C99
`uint8_t' wasn't widely enough available.  Now Guile finally made the
change to use C99 types, both internally and in Guile's public headers.

Note that this also applies to SCM_T_UINT8_MAX, SCM_T_INT8_MIN, for intN
and uintN for N in 8, 16, 32, and 64.  Guile also now uses ptrdiff_t
instead of scm_t_ptrdiff, and similarly for intmax_t, uintmax_t,
intptr_t, and uintptr_t.

** The two-argument form of `record-constructor'

Calling `record-constructor' with two arguments (the record type and a
list of field names) is deprecated.  Instead, call with just one
argument, and provide a wrapper around that constructor if needed.

* Incompatible changes

** All deprecated code removed

All code deprecated in Guile 2.2 has been removed.  See older NEWS, and
check that your programs can compile without linker warnings and run
without runtime warnings.  See "Deprecation" in the manual.

In particular, the function `scm_generalized_vector_get_handle' which
was deprecated in 2.0.9 but remained in 2.2, has now finally been
removed. As a replacement, use `scm_array_get_handle' to get a handle
and `scm_array_handle_rank' to check the rank.

** Remove "self" field from vtables and "redefined" field from classes

These fields were used as part of the machinery for class redefinition
and is no longer needed.

** VM hook manipulation simplified

The low-level mechanism to instrument a running virtual machine for
debugging and tracing has been simplified.  See "VM Hooks" in the
manual, for more.

* Changes to the distribution

** New effective version

The "effective version" of Guile is now 3.0, which allows parallel
installation with other effective versions (for example, the older Guile
2.2).  See "Parallel Installations" in the manual for full details.
Notably, the `pkg-config' file is now `guile-3.0', and there are new
`guile-3' and `guile-3.0' features for `cond-expand'.

Re: GNU Guile 2.9.9 Released [beta]

[John Cowan]

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Guile 2.9.9, like .8 and .7, does not build on Cygwin (64 bit).  Configure
runs without error, but make crashes with this (truncated to just the tail):

Making all in bootstrap
make[2]: Entering directory
'/cygdrive/c/Users/rr828893/Downloads/guile-2.9.9/bootstrap'
  BOOTSTRAP GUILEC ice-9/eval.go
  BOOTSTRAP GUILEC ice-9/psyntax-pp.go
  BOOTSTRAP GUILEC language/cps/intmap.go
  BOOTSTRAP GUILEC language/cps/intset.go
  BOOTSTRAP GUILEC language/cps/graphs.go
  BOOTSTRAP GUILEC ice-9/vlist.go
  BOOTSTRAP GUILEC srfi/srfi-1.go
/bin/sh: line 6:  4294 Segmentation fault      (core dumped)
GUILE_AUTO_COMPILE=0 ../meta/build-env guild compile
--target="x86_64-unknown-cygwin" -O1 -Oresolve-primitives -L
"/home/rr828893/Downloads/guile-2.9.9/module" -L
"/home/rr828893/Downloads/guile-2.9.9/guile-readline" -o "srfi/srfi-1.go"
"../module/srfi/srfi-1.scm"
make[2]: *** [Makefile:1930: srfi/srfi-1.go] Error 139
make[2]: Leaving directory
'/cygdrive/c/Users/rr828893/Downloads/guile-2.9.9/bootstrap'
make[1]: *** [Makefile:1849: all-recursive] Error 1
make[1]: Leaving directory
'/cygdrive/c/Users/rr828893/Downloads/guile-2.9.9'
make: *** [Makefile:1735: all] Error 2

All previous problems (which were easy to work around) have gone away in
this release, which is progress, but it doesn't get me past Guile 2.2.



John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
Your worships will perhaps be thinking that it is an easy thing
to blow up a dog? [Or] to write a book?
    --Don Quixote, Introduction

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bug#39118: Segfault while building on 64-bit Cygwin

[Ludovic Courtès]

Hi John,

John Cowan <cowan@ccil.org> skribis:

> Guile 2.9.9, like .8 and .7, does not build on Cygwin (64 bit).  Configure
> runs without error, but make crashes with this (truncated to just the tail):
>
> Making all in bootstrap
> make[2]: Entering directory
> '/cygdrive/c/Users/rr828893/Downloads/guile-2.9.9/bootstrap'
>   BOOTSTRAP GUILEC ice-9/eval.go
>   BOOTSTRAP GUILEC ice-9/psyntax-pp.go
>   BOOTSTRAP GUILEC language/cps/intmap.go
>   BOOTSTRAP GUILEC language/cps/intset.go
>   BOOTSTRAP GUILEC language/cps/graphs.go
>   BOOTSTRAP GUILEC ice-9/vlist.go
>   BOOTSTRAP GUILEC srfi/srfi-1.go
> /bin/sh: line 6:  4294 Segmentation fault      (core dumped)
> GUILE_AUTO_COMPILE=0 ../meta/build-env guild compile
> --target="x86_64-unknown-cygwin" -O1 -Oresolve-primitives -L
> "/home/rr828893/Downloads/guile-2.9.9/module" -L
> "/home/rr828893/Downloads/guile-2.9.9/guile-readline" -o "srfi/srfi-1.go"
> "../module/srfi/srfi-1.scm"
> make[2]: *** [Makefile:1930: srfi/srfi-1.go] Error 139
> make[2]: Leaving directory
> '/cygdrive/c/Users/rr828893/Downloads/guile-2.9.9/bootstrap'
> make[1]: *** [Makefile:1849: all-recursive] Error 1
> make[1]: Leaving directory
> '/cygdrive/c/Users/rr828893/Downloads/guile-2.9.9'
> make: *** [Makefile:1735: all] Error 2

Could you try building 3.0.0 with JIT enabled and grab a backtrace?

Thanks in advance!

Ludo’.

Re: Segfault while building on 64-bit Cygwin

[John Cowan]

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Yes, gladly, but I don't know how to get one in this context.  Do I need to
add some flags to the Makefile, and if so, where?  (It's a twisty maze of
passages, all different.) . Note that this *is* a build with JIT enabled;
when I disable it using the env variable, there are no errors and 3.0.0
works fine.

Also, it may take some time, as I have to rebuild my Windows system.

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bug#39118: Segfault while building on 64-bit Cygwin

[Mike Gran via Bug reports for GUILE, GNU's Ubiquitous Extension Language]

On Mon, Jan 20, 2020 at 11:38:35AM -0500, John Cowan wrote:
> Yes, gladly, but I don't know how to get one in this context.  Do I need to
> add some flags to the Makefile, and if so, where?  (It's a twisty maze of
> passages, all different.) . Note that this *is* a build with JIT enabled;
> when I disable it using the env variable, there are no errors and 3.0.0
> works fine.
> 
> Also, it may take some time, as I have to rebuild my Windows system.

I also tried building Guile 3.0.0 on Cygwin 3.1.x.  The failure comes from
trying to parse compiled .go files.

The last time that I had this sort of problem, it was because the
O_BINARY flag was dropped or missing when writing .go files, leading
to CR+LF characters in the compiled files.  And I diagnosed it by
byte-comparing Linux-compiled .go files with Cygwin-compiled .go
files, and by looking for CR+LF combinations in the compiled .go
files.

I don't know if that is what is happening here, but, I'll check that
next time I have a chance.

Thanks,
Michael

Re: Segfault while building on 64-bit Cygwin

[Ludovic Courtès]

Hello,

John Cowan <cowan@ccil.org> skribis:

> Yes, gladly, but I don't know how to get one in this context.

You would unpack, configure, and build like you did before (with JIT
enabled, so as to reproduce the crash), but before that you’d run
“ulimit -c unlimited” in that shell to make sure there’s a core dumped
when it crashes.

Once it has crashed, locate the ‘core’ file (or ‘core.*’), and run, say:

  gdb libguile/.libs/guile bootstrap/core

Then from the GDB prompt:

  thread apply all bt

TIA,
Ludo’.

Re: bug#39118: Segfault while building on 64-bit Cygwin

[szgyg]

On Tue, Jan 21, 2020 at 10:01:58AM +0100, Ludovic Courtès wrote:
> but before that you’d run
> “ulimit -c unlimited” in that shell to make sure there’s a core dumped
> when it crashes.

This won't work on cygwin. If you want a core dump, you should use the
dumper tool, as described here
https://cygwin.com/cygwin-ug-net/dumper.html
Or you can set error_start to gdb to get an interactive gdb session on error.

s

Re: bug#39118: Segfault while building on 64-bit Cygwin

[John Cowan]

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I'm no longer talking about Cygwin (which builds fine without JIT).  I'm
now talking about MacOS Catalina, which needs a core dump to debug, but on
which nobody seems to know how to enable core dumps.

On Tue, Jan 21, 2020 at 1:41 PM szgyg <szgyg@ludens.elte.hu> wrote:

> On Tue, Jan 21, 2020 at 10:01:58AM +0100, Ludovic Courtès wrote:
> > but before that you’d run
> > “ulimit -c unlimited” in that shell to make sure there’s a core dumped
> > when it crashes.
>
> This won't work on cygwin. If you want a core dump, you should use the
> dumper tool, as described here
> https://cygwin.com/cygwin-ug-net/dumper.html
> Or you can set error_start to gdb to get an interactive gdb session on
> error.
>
> s
>
>
>
>

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Re: Segfault while building on 64-bit Cygwin

[John Cowan]

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Thanks.  Unfortunately, the standard recipe for making core dumps on Mac
(put "limit core unlimited" into /etc/launchd.conf and reboot, make sure
/cores is writable, set ulimit -c unlimited) seem to actually enable them
on MacOS Catalina (10.15.2).  I have tested with SIGQUIT and SIGSEGV on
running processes and no dumps appear in /cores.

On Tue, Jan 21, 2020 at 4:02 AM Ludovic Courtès <ludo@gnu.org> wrote:

> Hello,
>
> John Cowan <cowan@ccil.org> skribis:
>
> > Yes, gladly, but I don't know how to get one in this context.
>
> You would unpack, configure, and build like you did before (with JIT
> enabled, so as to reproduce the crash), but before that you’d run
> “ulimit -c unlimited” in that shell to make sure there’s a core dumped
> when it crashes.
>
> Once it has crashed, locate the ‘core’ file (or ‘core.*’), and run, say:
>
>   gdb libguile/.libs/guile bootstrap/core
>
> Then from the GDB prompt:
>
>   thread apply all bt
>
> TIA,
> Ludo’.
>

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Re: Segfault while building on 64-bit Cygwin

[Ludovic Courtès]

Hi,

John Cowan <cowan@ccil.org> skribis:

> Thanks.  Unfortunately, the standard recipe for making core dumps on Mac

This bug report is about Cygwin, not macOS, right?  :-)

Ludo’.

Re: Segfault while building on 64-bit Cygwin

[John Cowan]

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Both Cygwin and MacOS crash in pretty much the same way.  By disabling the
JIT, I was able to get the Cygwin build to run to completion.  On MacOS
with --disable-jit, however, I am now getting an entirely new failure:

  CC       readline.lo
readline.c:432:7: warning: implicitly declaring library function 'strncmp'
with type 'int (const char *, const char *,
      unsigned long)' [-Wimplicit-function-declaration]
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
      ^
readline.c:432:7: note: include the header <string.h> or explicitly provide
a declaration for 'strncmp'
readline.c:432:16: warning: implicit declaration of function
'rl_get_keymap_name' is invalid in C99
      [-Wimplicit-function-declaration]
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
               ^
readline.c:432:16: warning: incompatible integer to pointer conversion
passing 'int' to parameter of type 'const char *'
      [-Wint-conversion]
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 warnings generated.
  CCLD     guile-readline.la
Undefined symbols for architecture x86_64:
  "_rl_get_keymap_name", referenced from:
      _scm_init_readline in readline.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

On Thu, Jan 23, 2020 at 3:35 PM Ludovic Courtès <ludo@gnu.org> wrote:

> Hi,
>
> John Cowan <cowan@ccil.org> skribis:
>
> > Thanks.  Unfortunately, the standard recipe for making core dumps on Mac
>
> This bug report is about Cygwin, not macOS, right?  :-)
>
> Ludo’.
>

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Re: Segfault while building on 64-bit Cygwin

[Ludovic Courtès]

John Cowan <cowan@ccil.org> skribis:

> Both Cygwin and MacOS crash in pretty much the same way.  By disabling the
> JIT, I was able to get the Cygwin build to run to completion.

That I understand.  However, I was asking for the backtrace of the crash
on Cygwin when JIT is enabled.  Could you grab it?

Thanks in advance,
Ludo’.

Re: Segfault while building on 64-bit Cygwin

[John Cowan]

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On Sat, Jan 25, 2020 at 8:51 AM Ludovic Courtès <ludo@gnu.org> wrote:


> That I understand.  However, I was asking for the backtrace of the crash
> on Cygwin when JIT is enabled.  Could you grab it?
>

1. The wisdom of the Internet has not been able to figure out how to
generate a core dump on MacOS 10.15.2 (Catalina).  The usual set of
enabling steps can be performed without error, but still no core dump.

2. Until today I believed that there was no way to generate a Cygwin core
dump.  I know now that there is, but I may not be able to test it until
Monday.  I'll let you know, and hopefully that will provide insight into
the MacOS problem as well.

3.  I will try to work further on the MacOS libffi problem (which surfaces
when you do --disable-jit to bypass the above problem) to convince MacOS to
use GNU libffi rather than the native one.  It probably has to do with
pkg-config, which I barely understand.

"All problems are config problems."



John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
We are lost, lost.  No name, no business, no Precious, nothing.  Only empty.
Only hungry: yes, we are hungry.  A few little fishes, nassty bony little
fishes, for a poor creature, and they say death.  So wise they are; so just,
so very just.  --Gollum

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bug#39118: Segfault while building on 64-bit Cygwin

[John Cowan]

[-- Attachment #1.1: Type: text/plain, Size: 2195 bytes --]

Aaaand... Cygwin doesn't do core dumps. Under the skin it's WIndows, after
all.  This is what I get when I specify ulimit -c unlimited and rebuild:

Exception: STATUS_ACCESS_VIOLATION at rip=0055A8B1B25
rax=0000000000000000 rbx=FFFFFFFFFFFFFF90 rcx=FFFFFFFFFFFFFF90
rdx=000000000034964A rsi=000007000084ECC0 rdi=FFFFFFFFFFFFFF90
r8 =000007000084ECC0 r9 =0000000000000002 r10=0000000100000000
r11=000000055A86B190 r12=0000000000000002 r13=000000055A931EA0
r14=000006FFFFFEF840 r15=0000000000000000
rbp=000000000034964A rsp=00000000FFFFBDA0
program=C:\Users\rr828893\Downloads\guile-3.0.0\libguile\.libs\guile.exe,
pid 62833, thread main
cs=0033 ds=002B es=002B fs=0053 gs=002B ss=002B

I can't imagine what you can make of that.

On Sat, Jan 25, 2020 at 10:54 AM John Cowan <cowan@ccil.org> wrote:

>
>
> On Sat, Jan 25, 2020 at 8:51 AM Ludovic Courtès <ludo@gnu.org> wrote:
>
>
>> That I understand.  However, I was asking for the backtrace of the crash
>> on Cygwin when JIT is enabled.  Could you grab it?
>>
>
> 1. The wisdom of the Internet has not been able to figure out how to
> generate a core dump on MacOS 10.15.2 (Catalina).  The usual set of
> enabling steps can be performed without error, but still no core dump.
>
> 2. Until today I believed that there was no way to generate a Cygwin core
> dump.  I know now that there is, but I may not be able to test it until
> Monday.  I'll let you know, and hopefully that will provide insight into
> the MacOS problem as well.
>
> 3.  I will try to work further on the MacOS libffi problem (which surfaces
> when you do --disable-jit to bypass the above problem) to convince MacOS to
> use GNU libffi rather than the native one.  It probably has to do with
> pkg-config, which I barely understand.
>
> "All problems are config problems."
>
>
>
> John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
> We are lost, lost.  No name, no business, no Precious, nothing.  Only
> empty.
> Only hungry: yes, we are hungry.  A few little fishes, nassty bony little
> fishes, for a poor creature, and they say death.  So wise they are; so
> just,
> so very just.  --Gollum
>

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[-- Attachment #2: guile.exe.stackdump --]
[-- Type: application/octet-stream, Size: 544 bytes --]

Exception: STATUS_ACCESS_VIOLATION at rip=0055A8B1B25
rax=0000000000000000 rbx=FFFFFFFFFFFFFF90 rcx=FFFFFFFFFFFFFF90
rdx=000000000034964A rsi=000007000084ECC0 rdi=FFFFFFFFFFFFFF90
r8 =000007000084ECC0 r9 =0000000000000002 r10=0000000100000000
r11=000000055A86B190 r12=0000000000000002 r13=000000055A931EA0
r14=000006FFFFFEF840 r15=0000000000000000
rbp=000000000034964A rsp=00000000FFFFBDA0
program=C:\Users\rr828893\Downloads\guile-3.0.0\libguile\.libs\guile.exe, pid 62833, thread main
cs=0033 ds=002B es=002B fs=0053 gs=002B ss=002B

bug#39118: Segfault while building on 64-bit Cygwin

[szgyg]

On Fri, Jan 31, 2020 at 09:23:19AM -0500, John Cowan wrote:
> Aaaand... Cygwin doesn't do core dumps. Under the skin it's WIndows, after
> all.  This is what I get when I specify ulimit -c unlimited and rebuild:
> [...]

Please see my previous mail on how to get a real core dump on cygwin
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=39118#28


>> On Sat, Jan 25, 2020 at 8:51 AM Ludovic Courtès <ludo@gnu.org> wrote:
>>
>>> That I understand.  However, I was asking for the backtrace of the crash
>>> on Cygwin when JIT is enabled.  Could you grab it?

#v+
  BOOTSTRAP GUILEC ice-9/eval.go
  BOOTSTRAP GUILEC ice-9/psyntax-pp.go
  BOOTSTRAP GUILEC language/cps/intmap.go
  BOOTSTRAP GUILEC language/cps/intset.go
  BOOTSTRAP GUILEC language/cps/graphs.go
  BOOTSTRAP GUILEC ice-9/vlist.go
  BOOTSTRAP GUILEC srfi/srfi-1.go

Thread 1 received signal SIGSEGV, Segmentation fault.
[Switching to Thread 7444.0x2640]
0x000000055a8b1b25 in scm_to_uint64 (val=val@entry=0xffffffffffffff90) at ../../guile-3.0.0/libguile/conv-uinteger.i.c:44
44        else if (SCM_BIGP (val))
(gdb) bt
#0  0x000000055a8b1b25 in scm_to_uint64 (val=val@entry=0xffffffffffffff90) at ../../guile-3.0.0/libguile/conv-uinteger.i.c:44
#1  0x000000055a86b1ea in scm_bytevector_copy_x (source=0x700000948620, source_start=0x34964a, target=0x700000907600, target_start=0x2, len=0xffffffffffffff90)
    at ../../guile-3.0.0/libguile/bytevectors.c:604
#2  0x00006ffffe743866 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

  BOOTSTRAP GUILEC language/tree-il.go

(gdb) bt
#0  0x000000055a8b1b25 in scm_to_uint64 (val=val@entry=0xffffffffffffff90)
    at ../../guile-3.0.0/libguile/conv-uinteger.i.c:44
#1  0x000000055a86b1ea in scm_bytevector_copy_x (source=0x70000055f160, source_start=0x34964a, target=0x700000808c90,
    target_start=0x2, len=0xffffffffffffff90) at ../../guile-3.0.0/libguile/bytevectors.c:604
#2  0x00006ffffe73f936 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

  BOOTSTRAP GUILEC language/tree-il/analyze.go

(gdb) bt
#0  0x000000055a8b1b25 in scm_to_uint64 (val=val@entry=0xffffffffffffff90)
    at ../../guile-3.0.0/libguile/conv-uinteger.i.c:44
#1  0x000000055a86b1ea in scm_bytevector_copy_x (source=0x700000645160, source_start=0x34964a, target=0x7000008012d0,
    target_start=0x2, len=0xffffffffffffff90) at ../../guile-3.0.0/libguile/bytevectors.c:604
#2  0x00006ffffe753fc6 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

^C
#v-

s

Re: bug#39118: Segfault while building on 64-bit Cygwin

[John Cowan]

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On Mon, Feb 3, 2020 at 5:11 PM szgyg <szgyg@ludens.elte.hu> wrote:

On Fri, Jan 31, 2020 at 09:23:19AM -0500, John Cowan wrote:
> > Aaaand... Cygwin doesn't do core dumps. Under the skin it's WIndows,
> after
> > all.  This is what I get when I specify ulimit -c unlimited and rebuild:
> > [...]
>
> Please see my previous mail on how to get a real core dump on cygwin
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=39118#28


Okay, I looked at that page.  However, Cygwin's dumper requires you to know
the Windows PID of the process to dump.  Clearly it is intended for a
long-running process such as a server process, which you can force to core
dump, as if by "/bin/kill -SIGSEGV pid"; it is not suitable for a process
that gets a segmentation violation for internal reasons.  In any case, when
building, I have no idea of the pid of the process which is dumping; it
starts up and then dumps immediately.



John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
The Penguin shall hunt and devour all that is crufty, gnarly and
bogacious; all code which wriggles like spaghetti, or is infested with
blighting creatures, or is bound by grave and perilous Licences shall it
capture.  And in capturing shall it replicate, and in replicating shall
it document, and in documentation shall it bring freedom, serenity and
most cool froodiness to the earth and all who code therein.  --Gospel of Tux

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Re: bug#39118: Segfault while building on 64-bit Cygwin

[szgyg]

On Wed, Feb 05, 2020 at 04:11:04PM -0500, John Cowan wrote:
> On Mon, Feb 3, 2020 at 5:11 PM szgyg <szgyg@ludens.elte.hu> wrote:
> 
> On Fri, Jan 31, 2020 at 09:23:19AM -0500, John Cowan wrote:
> > > Aaaand... Cygwin doesn't do core dumps. Under the skin it's WIndows,
> > after
> > > all.  This is what I get when I specify ulimit -c unlimited and rebuild:
> > > [...]
> >
> > Please see my previous mail on how to get a real core dump on cygwin
> > https://debbugs.gnu.org/cgi/bugreport.cgi?bug=39118#28
> 
> 
> Okay, I looked at that page.  However, Cygwin's dumper requires you to know
> the Windows PID of the process to dump.  Clearly it is intended for a
> long-running process such as a server process, which you can force to core
> dump, as if by "/bin/kill -SIGSEGV pid"; it is not suitable for a process
> that gets a segmentation violation for internal reasons.  In any case, when
> building, I have no idea of the pid of the process which is dumping; it
> starts up and then dumps immediately.


| One common way to use dumper is to plug it into cygwin's Just-In-Time
| debugging facility by adding
| error_start=x:\path\to\dumper.exe
| to the CYGWIN environment variable. Please note that x:\path\to\dumper.exe
| is Windows-style and not cygwin path. If error_start is set this way, then
| dumper will be started whenever some program encounters a fatal error.


s