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Subject: Re: ImageMagick maybe broken by libgs9 upgrade
To: cygwin AT cygwin DOT com
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Date: Tue, 23 Jun 2020 14:18:43 -0400
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From: Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Ken Brown <kbrown AT cornell DOT edu>
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On 6/23/2020 12:56 PM, Marco Atzeri via Cygwin wrote:
> On 23.06.2020 15:03, Markus Hoenicka wrote:
>> On 2020-06-23 14:15, Ken Brown via Cygwin was heard to say:
>>> On 6/23/2020 7:27 AM, Ken Brown via Cygwin wrote:
>>>> On 6/22/2020 9:37 PM, Emily via Cygwin wrote:
>=20
>>>>>
>>>>> But in case other ImageMagick functionality is also broken, this is=
n't a=20
>>>>> permanent solution.=A0 I tried to downgrade libgs9, but 9.27 is no =
longer an=20
>>>>> option in setup, even after I added another mirror.
>>>>
>>>> Please provide a sample label.pdf for which you're seeing this behav=
ior.
>>>
>>> You could also try adding the '-verbose' option to your command line
>>> to see if that gives a clue.
>>>
>>> Ken
>>
>> Hi,
>>
>> I don't know whether this helps to track down the problem, but here go=
es=20
>> anyway: I see the same crash with .ps and .eps files (unsurprisingly, =
as these=20
>> and .pdf are processed by libgs). The same conversions work with "gm c=
onvert"=20
>> from the GraphicsMagick package. gm is not linked against libgs, but s=
eems to=20
>> invoke the gs executable instead. This does not crash, although it is =
linked=20
>> against the very same libgs.
>>
>> regards,
>> Markus
>>
>=20
>=20
> without a sample case we don't know if we need to rebuild ImageMagick
> or GS

I found a .eps file with which I could reproduce the crash (attached), us=
ing the=20
OP's command line with her .pdf file replaced by the attached .eps file. =
 Here's=20
the gdb backtrace after the crash:

Thread 1 "convert" received signal SIGSEGV, Segmentation fault.
gs_lib_ctx_init (ctx=3Dctx AT entry=3D0xfffeed30, mem=3Dmem AT entry=3D0x800098=
7b0)
     at /usr/src/debug/ghostscript-9.52-2/base/gslibctx.c:269
269             gx_monitor_enter((gx_monitor_t *)(pio->core->monitor));
(gdb) bt
#0  gs_lib_ctx_init (ctx=3Dctx AT entry=3D0xfffeed30, mem=3Dmem AT entry=3D0x80=
00987b0)
     at /usr/src/debug/ghostscript-9.52-2/base/gslibctx.c:269
#1  0x00000003ca37e0a3 in gs_malloc_init_with_context (ctx=3D0xfffeed30)
     at /usr/src/debug/ghostscript-9.52-2/base/gsmalloc.c:595
#2  0x00000003ca439da6 in psapi_new_instance (pinstance=3D0xfffee938,
     caller_handle=3D0xfffee930)
     at /usr/src/debug/ghostscript-9.52-2/psi/psapi.c:92
#3  0x00000003ca49e995 in gsapi_new_instance (pinstance=3D<optimized out>=
,
     caller_handle=3D<optimized out>)
     at /usr/src/debug/ghostscript-9.52-2/psi/iapi.c:64
#4  0x00000003fd2f53dc in InvokePostscriptDelegate (verbose=3DMagickFalse=
,
     command=3Dcommand AT entry=3D0xfffeed30 "'gs' -sstdout=3D%stderr -dQUIE=
T -dSAFER -dBAT
CH -dNOPAUSE -dNOPROMPT -dMaxBitmap=3D500000000 -dAlignToPixels=3D0 -dGri=
dFitTT=3D2 '-s
DEVICE=3Dpngalpha' -dTextAlphaBits=3D4 -dGraphicsAlphaBits=3D4 '-r300x300=
' -g196x2"...,
  message=3Dmessage AT entry=3D0xffff3d30 "", exception=3Dexception AT entry=3D=
0x8000664a0)
     at /usr/src/debug/ImageMagick-6.9.10.11-2/coders/ps.c:237
#5  0x00000003fd2f6234 in ReadPSImage (image_info=3D0x800076170,
     exception=3D0x8000664a0)
     at /usr/src/debug/ImageMagick-6.9.10.11-2/coders/ps.c:846

The crash occurs because of an attempt to access ridiculously high memory=
:

(gdb) p pio->core
$8 =3D (gs_lib_ctx_core_t *) 0x73253d74756f6474

I'm looking into it.

Ken

--------------DB74B71679D03B4E6DC1B24B
Content-Type: application/postscript;
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Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
 filename="TCstep1.eps"

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%%Title: /home/kbrown/courses/4340/TCstep1.fig
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%%CreationDate: Tue Feb 17 16:43:47 2009
%%For: kbrown AT markov (Ken Brown,U-MARKOV\kbrown,S-1-5-21-133211054-3407560575-1477132610-1006)
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