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panic: previous op failed to extend arg stack #16091

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p5pRT opened this issue Jul 28, 2017 · 9 comments
Closed

panic: previous op failed to extend arg stack #16091

p5pRT opened this issue Jul 28, 2017 · 9 comments

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@p5pRT
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p5pRT commented Jul 28, 2017

Migrated from rt.perl.org#131811 (status was 'resolved')

Searchable as RT131811$

@p5pRT
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p5pRT commented Jul 28, 2017

From @craigberry

On VMS, blead as of​:

$ type .patch
blead 2017-07-27.19​:28​:14 a8cb194 v5.27.2-77-ga8cb1947aa

has several new test failures that have appeared in the last few days, all with the panic in my subject line. Here's the shortest, simplest one run under the VMS debugger​:

$ dbgperl -T dist/Locale-Maketext/t/09_compile.t
%DEBUG-W-DWNOT1PROC, the 1 process debugger cannot be run in DECwindows mode

  OpenVMS I64 Debug64 Version V8.4-001

%DEBUG-I-INITIAL, Language​: C, Module​: PERLMAIN
%DEBUG-I-NOTATMAIN, Type GO to reach MAIN program

DBG> go
break at routine PERLMAIN\main
182985​: PL_use_safe_putenv = FALSE;
DBG> set image dbgperlshr
DBG> set module/all
DBG> go
1..2
panic​: previous op failed to extend arg stack​: base=1a6f670, sp=1a6fe88, hwm=1a6f678
# Looks like your test exited with 1 before it could output anything.
%SYSTEM-F-ACCVIO, access violation, reason mask=00, virtual address=0000000000000001, PC=0000000000370820, PS=0000001B
break on unhandled exception at HV\Perl_hv_common\%LINE 182678+32
182678​: if (HeHASH(entry) != hash) /* strings can't be equal */
DBG> call Perl_sv_dump(entry)
SV = NULL(0x0) at 0x463c9e8
  REFCNT = 1
  FLAGS = (PADTMP)
value returned is 70647408
DBG> call Perl_sv_dump(hash)
%SYSTEM-F-ACCVIO, access violation, reason mask=00, virtual address=00000000ED060719, PC=00000000004D0E81, PS=0000001B
break on unhandled exception at DUMP\Perl_sv_dump\%LINE 186350+31
186350​: if (sv && SvROK(sv))
DBG>

The simplest reproducer I could come up with is​:

$ perl -MTest​::More -e "my @​ENV_values = sort keys %ENV;"
panic​: previous op failed to extend arg stack​: base=834790, sp=834fac, hwm=834798
assert error​: expression = (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx)) || PL_savestack_ix == cx->blk_oldsaveix, in file D0​:[craig.blead]inline.h;1 at line 1379

Removing Test​::More makes the panic go away. I'm not really sure where to begin debugging this. There is a fair amount of VMS-only code in hv.c (delineated by DYNAMIC_ENV_FETCH), so my first hunch would be that the magic there disagrees with something new.

Here's my configuration​:

$ perl -V
Summary of my perl5 (revision 5 version 27 subversion 3) configuration​:
  Snapshot of​: a8cb194
  Platform​:
  osname=VMS
  osvers=V8.4
  archname=VMS_IA64
  uname='VMS alma V8.4 HP rx2660 (1.67GHz/9.0MB)'
  config_args='-"Dusedevel" -"DDEBUGGING" -"Duse64bitint" -"Dusevmsdebug" -"des"'
  hint=none
  useposix=false
  d_sigaction=define
  useithreads=undef
  usemultiplicity=undef
  use64bitint=define
  use64bitall=undef
  uselongdouble=undef
  usemymalloc=undef
  default_inc_excludes_dot=define
  bincompat5005=undef
  Compiler​:
  cc='CC/DECC'
  ccflags ='/Include=[]/Standard=Relaxed_ANSI/Prefix=All/Obj=.obj /NOANSI_ALIAS/float=ieee/ieee=denorm/NAMES=(SHORTENED)/Define=_USE_STD_STAT=1'
  optimize='/List/Debug/NoOpt'
  cppflags='undef'
  ccversion='70390020'
  gccversion=''
  gccosandvers='undef'
  intsize=4
  longsize=4
  ptrsize=4
  doublesize=8
  byteorder=12345678
  doublekind=3
  d_longlong=define
  longlongsize=8
  d_longdbl=define
  longdblsize=16
  longdblkind=1
  ivtype='long long'
  ivsize=8
  nvtype='double'
  nvsize=8
  Off_t='off_t'
  lseeksize=8
  alignbytes=8
  prototype=define
  Linker and Libraries​:
  ld='Link/nodebug'
  ldflags ='/Debug/Trace/Map'
  libpth=/sys$share /sys$library
  libs=
  perllibs=
  libc=(DECCRTL)
  so=exe
  useshrplib=true
  libperl=undef
  gnulibc_version='undef'
  Dynamic Linking​:
  dlsrc=dl_vms.xs
  dlext=exe
  d_dlsymun=undef
  ccdlflags=''
  cccdlflags=''
  lddlflags='/Share'

Characteristics of this PERLSHR image​:
  Compile-time options​:
  DEBUGGING
  HAS_TIMES
  HAVE_INTERP_INTERN
  PERLIO_LAYERS
  PERL_COPY_ON_WRITE
  PERL_DONT_CREATE_GVSV
  PERL_EXTERNAL_GLOB
  PERL_MALLOC_WRAP
  PERL_OP_PARENT
  PERL_PRESERVE_IVUV
  PERL_USE_DEVEL
  USE_64_BIT_INT
  USE_IEEE
  USE_LARGE_FILES
  USE_LOCALE
  USE_LOCALE_COLLATE
  USE_LOCALE_CTYPE
  USE_LOCALE_NUMERIC
  USE_LOCALE_TIME
  USE_PERLIO
  USE_PERL_ATOF
  VMS_DO_SOCKETS
  VMS_SHORTEN_LONG_SYMBOLS
  Built under VMS
  Compiled at Jul 27 2017 22​:02​:42
  @​INC​:
  /perl_root/lib/site_perl/VMS_IA64
  /perl_root/lib/site_perl
  /perl_root/lib/VMS_IA64/5_27_3
  /perl_root/lib

________________________________________
Craig A. Berry

"... getting out of a sonnet is much more
difficult than getting in."
  Brad Leithauser

@p5pRT
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p5pRT commented Jul 28, 2017

From @iabyn

On Fri, Jul 28, 2017 at 07​:13​:35AM -0700, Craig A.Berry wrote​:

panic​: previous op failed to extend arg stack​: base=1a6f670, sp=1a6fe88, hwm=1a6f678

This panic was added by me a month ago with 87058c3, and has had a couple
of tweaks since, most recently with

  978b185 2017-07-16 PL_curstackinfo->si_stack_hwm​: gently restore

Its quite possible that its a false positive, given that its a new
mechanism, or it may be detecting a real issue.

Its mechanism is as follows​:

In DEBUGGING builds, in Perl_runops_debug, just before calling the pp
function, it sets PL_curstackinfo->si_stack_hwm to the current stack
position. During execution of the op, macros like EXTEND() update
si_stack_hwm. On return from the pp function, Perl_runops_debug checks
that the new stack position isn't greater than si_stack_hwm, i.e. that the
op didn't return more things on the stack than it requested space for.

The complicated bit comes when the pp function triggers runops loop
entries and exits (e.g. tie, die)​: here si_stack_hwm needs to be correctly
saved and restored to avoid false positives, and that's where I've had to
tweak things.

To debug this, I would set a breakpoint on the croak("panic...") call,
than work backwards and find out what op had just been called in what
runoops loop, then set a break on that op with a suitable ignore count,
then see what the op does and how it messes with the stack and si_stack_hwm
(and if it causes inner runops loops to be started, how si_stack_hwm is
saved and restored).

Eventually you'll either find some code which is pushing things on the stack
without extending it first, or si_stack_hwm is in some way getting messed
up. If the latter, I may need to fix it.

--
It's not that I'm afraid to die, I just don't want to be there when it
happens.
  -- Woody Allen

@p5pRT
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p5pRT commented Jul 28, 2017

The RT System itself - Status changed from 'new' to 'open'

@p5pRT
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p5pRT commented Jul 30, 2017

From @craigberry

On Jul 28, 2017, at 2​:28 PM, Dave Mitchell via RT <perlbug-followup@​perl.org> wrote​:

On Fri, Jul 28, 2017 at 07​:13​:35AM -0700, Craig A.Berry wrote​:

panic​: previous op failed to extend arg stack​: base=1a6f670, sp=1a6fe88, hwm=1a6f678

This panic was added by me a month ago with 87058c3, and has had a couple
of tweaks since, most recently with

978b185 2017-07-16 PL_curstackinfo->si_stack_hwm​: gently restore

Its quite possible that its a false positive, given that its a new
mechanism, or it may be detecting a real issue.

Its mechanism is as follows​:

In DEBUGGING builds, in Perl_runops_debug, just before calling the pp
function, it sets PL_curstackinfo->si_stack_hwm to the current stack
position. During execution of the op, macros like EXTEND() update
si_stack_hwm. On return from the pp function, Perl_runops_debug checks
that the new stack position isn't greater than si_stack_hwm, i.e. that the
op didn't return more things on the stack than it requested space for.

The complicated bit comes when the pp function triggers runops loop
entries and exits (e.g. tie, die)​: here si_stack_hwm needs to be correctly
saved and restored to avoid false positives, and that's where I've had to
tweak things.

To debug this, I would set a breakpoint on the croak("panic...") call,
than work backwards and find out what op had just been called in what
runoops loop, then set a break on that op with a suitable ignore count,
then see what the op does and how it messes with the stack and si_stack_hwm
(and if it causes inner runops loops to be started, how si_stack_hwm is
saved and restored).

Eventually you'll either find some code which is pushing things on the stack
without extending it first, or si_stack_hwm is in some way getting messed
up. If the latter, I may need to fix it.

Thanks. I tried to follow this advice and found it difficult to identify which instance of S_cx_popblock (where the panic check lives) was firing. Since it's a static function from inline.h, each module has its own copy. By the time the panic hits, the C stack is hosed and there are no active call frames. It appears to be the one from pp_ctl.c, but when I set a breakpoint on that I get stuck in a loop of endless "Out of memory!" messages until I kill it. I also noticed that there are often (but not always) access violations in non-debugging builds, so I don't think this panic is a false positive.

I eventually bisected the problem to​:

commit 8dc9003
Author​: David Mitchell <davem@​iabyn.com>
Date​: Fri Jul 21 14​:32​:57 2017 +0100

  hv_pushkv()​: handle keys() and values() too

  The newish function hv_pushkv() currently just pushes all key/value pairs on
  the stack. i.e. it does the equivalent of the perl code '() = %h'.
  Extend it so that it can handle 'keys %h' and values %h' too.

  This is basically moving the remaining list-context functionality out of
  do_kv() and into hv_pushkv().

  The rationale for this is that hv_pushkv() is a pure HV-related function,
  while do_kv() is a pp function for several ops including OP_KEYS/VALUES,
  and expects PL_op->op_flags/op_private to be valid.

The main difference I can see is that before the commit above, we always extended the stack by 2 regardless of whether we were iterating over keys, values, or both. Now we only extend by 2 when iterating both keys and values, and otherwise only extend by 1.

I've further simplified the reproducer to​:

$ perl -"Dst" -e "$ENV{foo}='bar'; my @​E = keys %ENV;"

EXECUTING...

  =>
(-e​:0) enter
  =>
(-e​:0) nextstate
  =>
(-e​:1) const(PV("bar"\0))
  => PV("bar"\0)
(-e​:1) multideref($ENV{"foo"})
  => PV("bar"\0) PVMG("bar"\0)
(-e​:1) sassign
  => PVMG("bar"\0)
(-e​:1) nextstate
  =>
(-e​:1) pushmark
  => *
(-e​:1) gv(main​::ENV)
  => * GV()
(-e​:1) rv2hv
  => * HV()
(-e​:1) keys
panic​: previous op failed to extend arg stack​: base=834790, sp=834f9c, hwm=834794
assert error​: expression = (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx)) || PL_savestack_ix == cx->blk_oldsaveix, in file D0​:[craig.blead]inline.h;1 at
line 1379

When I run the same thing on macOS, the line

  => PV("bar"\0) PVMG("bar"\0)

looks like​:

  => PV("bar"\0) PVMG()

but otherwise (except for the panic) looks the same.

My debugging time for the weekend is just about up, but it strikes me as plausible that the panic is telling the truth and the multideref($ENV{"foo"}) only extended the stack by one while placing two items on it and the "keys" op is an innocent victim that used to paper things over by reserving two slots on the stack where it really only needs one for its own purposes. But I'm not even sure I have read the debugging output correctly or know what I'm talking about and will have to revisit this later.

________________________________________
Craig A. Berry

"... getting out of a sonnet is much more
difficult than getting in."
  Brad Leithauser

@p5pRT
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p5pRT commented Jul 31, 2017

From @iabyn

On Sun, Jul 30, 2017 at 05​:44​:18PM -0500, Craig A. Berry wrote​:

Thanks. I tried to follow this advice and found it difficult to
identify which instance of S_cx_popblock (where the panic check lives)
was firing.

I think you're getting confused. The panic lives in Perl_runops_debug().

I've further simplified the reproducer to​:

$ perl -"Dst" -e "$ENV{foo}='bar'; my @​E = keys %ENV;"

EXECUTING...

=>

(-e​:0) enter
=>
(-e​:0) nextstate
=>
(-e​:1) const(PV("bar"\0))
=> PV("bar"\0)
(-e​:1) multideref($ENV{"foo"})
=> PV("bar"\0) PVMG("bar"\0)
(-e​:1) sassign
=> PVMG("bar"\0)
(-e​:1) nextstate
=>
(-e​:1) pushmark
=> *
(-e​:1) gv(main​::ENV)
=> * GV()
(-e​:1) rv2hv
=> * HV()
(-e​:1) keys
panic​: previous op failed to extend arg stack​: base=834790, sp=834f9c, hwm=834794
assert error​: expression = (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx)) || PL_savestack_ix == cx->blk_oldsaveix, in file D0​:[craig.blead]inline.h;1 at
line 1379

When I run the same thing on macOS, the line

=>  PV\("bar"\\0\)  PVMG\("bar"\\0\)

looks like​:

=>  PV\("bar"\\0\)  PVMG\(\)

but otherwise (except for the panic) looks the same.

That's distinctly odd. Since the string 'bar' at that point is on the
stack, but has not yet been used to assign a value to $ENV{foo}, $ENV{foo}
can't possibly have the value 'bar'. So the magic SV (whose set magic
causes the process's env to be updated) shouldn't be PVMG("bar"\0).

My debugging time for the weekend is just about up, but it strikes me as
plausible that the panic is telling the truth and the
multideref($ENV{"foo"}) only extended the stack by one while placing two
items on it and the "keys" op is an innocent victim that used to paper
things over by reserving two slots on the stack where it really only
needs one for its own purposes. But I'm not even sure I have read the
debugging output correctly or know what I'm talking about and will have
to revisit this later.

The panic means exactly that in Perl_runops_debug(), on return from
pp_keys, PL_stack_sp was at 0x834f9c, while EXTEND() called during the
run of pp_keys only extended the stack to 0x834794.

I would suggest​: set a breakpoint at the start of Perl_pp_keys, then set
watchpoints on PL_curstackinfo->si_stack_hwm and PL_stack_sp and see how
they change during the execution of pp_keys().

--
"You're so sadly neglected, and often ignored.
A poor second to Belgium, When going abroad."
  -- Monty Python, "Finland"

@p5pRT
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p5pRT commented Aug 5, 2017

From @craigberry

[at long last getting back to this]

On Jul 31, 2017, at 10​:04 AM, Dave Mitchell <davem@​iabyn.com> wrote​:

On Sun, Jul 30, 2017 at 05​:44​:18PM -0500, Craig A. Berry wrote​:

Thanks. I tried to follow this advice and found it difficult to
identify which instance of S_cx_popblock (where the panic check lives)
was firing.

I think you're getting confused. The panic lives in Perl_runops_debug().

Yup. For some reason I was thinking the assert and the panic happened in the same place.

I've further simplified the reproducer to​:

$ perl -"Dst" -e "$ENV{foo}='bar'; my @​E = keys %ENV;"

EXECUTING...

=>
(-e​:0) enter
=>
(-e​:0) nextstate
=>
(-e​:1) const(PV("bar"\0))
=> PV("bar"\0)
(-e​:1) multideref($ENV{"foo"})
=> PV("bar"\0) PVMG("bar"\0)
(-e​:1) sassign
=> PVMG("bar"\0)
(-e​:1) nextstate
=>
(-e​:1) pushmark
=> *
(-e​:1) gv(main​::ENV)
=> * GV()
(-e​:1) rv2hv
=> * HV()
(-e​:1) keys
panic​: previous op failed to extend arg stack​: base=834790, sp=834f9c, hwm=834794
assert error​: expression = (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx)) || PL_savestack_ix == cx->blk_oldsaveix, in file D0​:[craig.blead]inline.h;1 at
line 1379

When I run the same thing on macOS, the line

=> PV("bar"\0) PVMG("bar"\0)

looks like​:

=> PV("bar"\0) PVMG()

but otherwise (except for the panic) looks the same.

That's distinctly odd. Since the string 'bar' at that point is on the
stack, but has not yet been used to assign a value to $ENV{foo}, $ENV{foo}
can't possibly have the value 'bar'. So the magic SV (whose set magic
causes the process's env to be updated) shouldn't be PVMG("bar"\0).

My debugging time for the weekend is just about up, but it strikes me as
plausible that the panic is telling the truth and the
multideref($ENV{"foo"}) only extended the stack by one while placing two
items on it and the "keys" op is an innocent victim that used to paper
things over by reserving two slots on the stack where it really only
needs one for its own purposes. But I'm not even sure I have read the
debugging output correctly or know what I'm talking about and will have
to revisit this later.

The panic means exactly that in Perl_runops_debug(), on return from
pp_keys, PL_stack_sp was at 0x834f9c, while EXTEND() called during the
run of pp_keys only extended the stack to 0x834794.

I would suggest​: set a breakpoint at the start of Perl_pp_keys, then set
watchpoints on PL_curstackinfo->si_stack_hwm and PL_stack_sp and see how
they change during the execution of pp_keys().

We use a bunch more stack than we have allocated in Perl_hv_pushkv. The basic problem is that Perl_hv_pushkv extends stack space once based on how many keys are in the HV. But on VMS, the keys don't exist yet until the first call to Perl_hv_iternext_flags triggers a call to Perl_prime_env_iter in vms/vms.c. The following patch (not meant to be applied) shows how far off we are​:

Inline Patch
--- hv.c;-0	2017-07-27 05:49:23 -0500
+++ hv.c	2017-08-05 07:04:59 -0500
@@ -1008,6 +1008,7 @@ Perl_hv_pushkv(pTHX_ HV *hv, U32 flags)
     }
     else {
         Size_t nkeys = HvUSEDKEYS(hv);
+        Size_t actual_nkeys = 0;
         SSize_t ext;

         if (!nkeys)
@@ -1021,6 +1022,7 @@ Perl_hv_pushkv(pTHX_ HV *hv, U32 flags)
         EXTEND(SP, ext);

         while ((entry = hv_iternext(hv))) {
+            actual_nkeys++;
             if (flags & 1) {
                 SV *keysv = newSVhek(HeKEY_hek(entry));
                 SvTEMP_on(keysv);
@@ -1030,6 +1032,9 @@ Perl_hv_pushkv(pTHX_ HV *hv, U32 flags)
             if (flags & 2)
                 PUSHs(HeVAL(entry));
         }
+        if (actual_nkeys != nkeys)
+            Perl_croak(aTHX_ "panic: extended stack for %" UVuf " keys but iterated over %" UVuf,
+                       (UV)nkeys, (UV)actual_nkeys);
     }

     PUTBACK;
[end]

which dies like so​:

$ perl -e "$ENV{'foo'}='bar'; my @​e = keys %ENV;"
panic​: extended stack for 1 keys but iterated over 514 at -e line 1.
assert error​: expression = (CxTYPE(cx) == CXt_SUB && CxMULTICALL(cx)) || PL_savestack_ix == cx->blk_oldsaveix, in file D0​:[craig.blead]inline.h;1 at
line 1379

The safest thing to do would be to extend the stack inside the loop in Perl_hv_pushkv that iterates over keys, but we already have a code path that does that when the HV is a tied hash. So it seems to me the best solution is to piggyback PERL_MAGIC_env on the PERL_MAGIC_tied logic and consider both a form of being tied where we don't know the number of keys we'll get. The following solves the problem and I will push soonish unless someone tells me there is a better way to do it​:

commit 61084ee
Author​: Craig A. Berry <craigberry@​mac.com>
Date​: Sat Aug 5 08​:00​:32 2017 -0500

  Consider magic %ENV as tied in hv_pushkv.

  For the DYNAMIC_ENV_FETCH case, we don't know the number of keys
  until the first iteration triggers a call to prime_env_iter(), so
  piggyback on the tied magic case, which already handles extending
  the stack for each iteration rather than all at once beforehand.

Inline Patch
diff --git a/hv.c b/hv.c
index 20b4eceb98..7029e28387 100644
--- a/hv.c
+++ b/hv.c
@@ -988,7 +988,11 @@ void
 Perl_hv_pushkv(pTHX_ HV *hv, U32 flags)
 {
     HE *entry;
-    bool tied = SvRMAGICAL(hv) && mg_find(MUTABLE_SV(hv), PERL_MAGIC_tied);
+    bool tied = SvRMAGICAL(hv) && (mg_find(MUTABLE_SV(hv), PERL_MAGIC_tied)
+#ifdef DYNAMIC_ENV_FETCH  /* might not know number of keys yet */
+                                   || mg_find(MUTABLE_SV(hv), PERL_MAGIC_env)
+#endif
+                                  );
     dSP;

     PERL_ARGS_ASSERT_HV_PUSHKV;
[end]

________________________________________
Craig A. Berry

"... getting out of a sonnet is much more
difficult than getting in."
  Brad Leithauser

@p5pRT
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p5pRT commented Aug 5, 2017

From @iabyn

On Sat, Aug 05, 2017 at 09​:56​:56AM -0500, Craig A. Berry wrote​:

Author​: Craig A. Berry <craigberry@​mac.com>
Date​: Sat Aug 5 08​:00​:32 2017 -0500

Consider magic %ENV as tied in hv\_pushkv\.

For the DYNAMIC\_ENV\_FETCH case\, we don't know the number of keys
until the first iteration triggers a call to prime\_env\_iter\(\)\, so
piggyback on the tied magic case\, which already handles extending
the stack for each iteration rather than all at once beforehand\.

diff --git a/hv.c b/hv.c
index 20b4eceb98..7029e28387 100644
--- a/hv.c
+++ b/hv.c
@​@​ -988,7 +988,11 @​@​ void
Perl_hv_pushkv(pTHX_ HV *hv, U32 flags)
{
HE *entry;
- bool tied = SvRMAGICAL(hv) && mg_find(MUTABLE_SV(hv), PERL_MAGIC_tied);
+ bool tied = SvRMAGICAL(hv) && (mg_find(MUTABLE_SV(hv), PERL_MAGIC_tied)
+#ifdef DYNAMIC_ENV_FETCH /* might not know number of keys yet */
+ || mg_find(MUTABLE_SV(hv), PERL_MAGIC_env)
+#endif
+ );
dSP;

Looks good to me.

--
But Pity stayed his hand. "It's a pity I've run out of bullets",
he thought. -- "Bored of the Rings"

@p5pRT
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p5pRT commented Aug 5, 2017

From @craigberry

On Aug 5, 2017, at 10​:13 AM, Dave Mitchell via RT <perlbug-followup@​perl.org> wrote​:

Looks good to me.

Thanks, now pushed. This ticket can be closed.

________________________________________
Craig A. Berry

"... getting out of a sonnet is much more
difficult than getting in."
  Brad Leithauser

@p5pRT
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p5pRT commented Aug 6, 2017

@iabyn - Status changed from 'open' to 'resolved'

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