Subject: bug#38723: 27.0.50; macosx: [bootstrap-emacs.pdmp] Segmentation fault with ImageMagick

From: Stefan Kangas <[email-masked]>
Date: Tue, 25 Aug 2020 15:58:00 -0700

Sam Steingold <[email-masked]> writes:

>> * Alan Third <[email-masked]> [2019-12-23 21:26:49 +0000]:
>>
>> On Mon, Dec 23, 2019 at 10:54:53AM -0500, Sam Steingold wrote:
>>> (lldb) run --batch  -l loadup --temacs=pbootstrap
>> <snip>
>>> Loading /Users/sam.steingold/src/emacs/trunk/lisp/image.el (source)...
>>> Process 60246 stopped
>>> * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)
>>>     frame #0: 0x0000000100eebddc libomp.dylib`__kmp_set_indirect_lock(unsigned int*, int) + 14
>>> libomp.dylib`__kmp_set_indirect_lock:
>>> ->  0x100eebddc <+14>: movl   0x8(%rax), %edx
>>>     0x100eebddf <+17>: movq   (%rcx,%rdx,8), %rcx
>>>     0x100eebde3 <+21>: movq   (%rax), %rdi
>>>     0x100eebde6 <+24>: popq   %rbp
>>> Target 0: (temacs) stopped.
>>> (lldb) bt
>>> * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8)
>>>   * frame #0: 0x0000000100eebddc libomp.dylib`__kmp_set_indirect_lock(unsigned int*, int) + 14
>>>     frame #1: 0x0000000100ebfd10 libomp.dylib`__kmpc_set_lock + 189
>>>     frame #2: 0x0000000100a8e835 libMagickCore-7.Q16HDRI.7.dylib`ActivateSemaphoreInfo + 39
>>>     frame #3: 0x0000000100a1aa7e libMagickCore-7.Q16HDRI.7.dylib`GetMagickInfo + 58
>>>     frame #4: 0x0000000100a1aed9 libMagickCore-7.Q16HDRI.7.dylib`GetMagickList + 104
>>>     frame #5: 0x00000001001c44e2 temacs`Fimagemagick_types at image.c:9294:13 [opt]
>>>     frame #6: 0x0000000100146b64 temacs`eval_sub(form=<unavailable>) at eval.c:2270:15 [opt]

If I'm not mistaken, the crash here is within ImageMagick?  In other
words, this is not a bug in Emacs?

>>
>> Hi, I can’t replicate this. What version of ImageMagick are you using,
>> and where did you get it from?
>
> $ brew info ImageMagick
> ImageMagick: stable 7.0.9-10 (bottled), HEAD
> Tools and libraries to manipulate images in many formats
> https://www.imagemagick.org/
> /usr/local/Cellar/ImageMagick/7.0.9-10 (1,479 files, 23.9MB)
>   Poured from bottle on 2019-12-23 at 09:25:15
> From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/imagemagick.rb