Crash drawing polygon using DrawPath with SKGLView on iOS

[pauldendulk]

Description

The entire app crashes when drawing a polygon with 450 points.

Message in Debug console:

The app has been terminated. Failed to Stop app: An error occured on client IDB410102 while executing a reply for topic xvs/idb/4.10.10.2/stop-app The app has been terminated.

• The crash occurs now and then. In the sample project (in the git repository pointed to below) you can pinch zoom in and out. If you try that for a while the app crashes. Usually this is within 10 seconds.
• The polygon has no holes.
• I could not reproduce is the DrawPath Style argument is set to Fill, Stroke or StrokeAndFill seem to be necessary.
• The app zooms in by recalculating the coordinates. Not sure if it crashes with Scale zoom.
• This is polygon entered by a user. Most polygons don't crash.

Code

https://raw.githubusercontent.com/pauldendulk/PolygonCrash/master/CrashWhenDrawingPolygon/MyView.cs

Expected Behavior

No crash

Actual Behavior

After fast pinch zooming in and out the iOS application crashes.

Basic Information

• Version with issue: 1.60.2
• Last known good version: None, that I know
• IDE: Visual Studio
• Platform Target Frameworks: iOS when using SKGLView. On Android, WPF and UWP I do use GL views yet.
• Target Devices:
  • Tested on iPad Air 2 hardware.

Screenshots

Reproduction Link

https://github.com/pauldendulk/PolygonCrash Reproduce: Place two fingers on the screen and pinch zoom in and out repeatedly. For me it crashes within 10 seconds most of the time.

[charlenni]

Tested it with a SKCanvasView instead of SKGLView. There it isn't crashing. So I assume, that it is a problem with the GL part.

The crash report:

{"app_name":"CrashWhenDrawingPolygon","timestamp":"2018-06-30 12:53:27.11 +0200","app_version":"1.0","slice_uuid":"a1a3e5ec-bd5a-32a7-8685-e43e6db907c5","adam_id":0,"build_version":"1.0","bundleID":"com.mapsui.sampleapp3","share_with_app_devs":false,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 11.4 (15F79)","incident_id":"D1DF398D-D752-427B-88C8-ABA7454D49BF","name":"CrashWhenDrawingPolygon"}
Incident Identifier: D1DF398D-D752-427B-88C8-ABA7454D49BF
CrashReporter Key:   182112931a005bedaf3c34f5c6d603c282abc549
Hardware Model:      iPhone8,4
Process:             CrashWhenDrawingPolygon [500]
Path:                /private/var/containers/Bundle/Application/3BF3D41F-AC82-4F4A-B950-CD200A28FEB4/CrashWhenDrawingPolygon.app/CrashWhenDrawingPolygon
Identifier:          com.mapsui.sampleapp3
Version:             1.0 (1.0)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]
Coalition:           com.mapsui.sampleapp3 [587]

Date/Time:           2018-06-30 12:53:27.0567 +0200
Launch Time:         2018-06-30 12:53:21.0292 +0200
OS Version:          iPhone OS 11.4 (15F79)
Baseband Version:    6.60.00
Report Version:      104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_PROTECTION_FAILURE at 0x000000016f8dbff0
VM Region Info: 0x16f8dbff0 is in 0x16f8d8000-0x16f8dc000;  bytes after start: 16368  bytes before end: 15
      REGION TYPE                      START - END             [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      MALLOC_SMALL           000000011e800000-000000011f000000 [ 8192K] rw-/rwx SM=PRV  
      GAP OF 0x508d8000 BYTES
--->  STACK GUARD            000000016f8d8000-000000016f8dc000 [   16K] ---/rwx SM=NUL  ... for thread 0
      Stack                  000000016f8dc000-000000016f9d8000 [ 1008K] rw-/rwx SM=PRV  thread 0

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]
Triggered by Thread:  0

Filtered syslog:
None found

Thread 0 name:  tid_303  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
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1   libSkiaSharp                    0x0000000100c25fa4 0x100a3c000 + 2006948
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259 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
260 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
261 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
262 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
263 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
264 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
265 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
266 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
267 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
268 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
269 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
270 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
271 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
272 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
273 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
274 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
275 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
276 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
277 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
278 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
279 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
280 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
281 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
282 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
283 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
284 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
285 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
286 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
287 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
288 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
289 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
290 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
291 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
292 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
293 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
294 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
295 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
296 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
297 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
298 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
299 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
300 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
301 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
302 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
303 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
304 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
305 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
306 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
307 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
308 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
309 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
310 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
311 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
312 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
313 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
314 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
315 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
316 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
317 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
318 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
319 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
320 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
321 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
322 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
323 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
324 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
325 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
326 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
327 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
328 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
329 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
330 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
331 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
332 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
333 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
334 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
335 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
336 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
337 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
338 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
339 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
340 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
341 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
342 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
343 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
344 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
345 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
346 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
347 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
348 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
349 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
350 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
351 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
352 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
353 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
354 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
355 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
356 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
357 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
358 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
359 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
360 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
361 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
362 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
363 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
364 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
365 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
366 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
367 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
368 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
369 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
370 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
371 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
372 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
373 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
374 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
375 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
376 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
377 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
378 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
379 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
380 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
381 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
382 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
383 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
384 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
385 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
386 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
387 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
388 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
389 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
390 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
391 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
392 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
393 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
394 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
395 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
396 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
397 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
398 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
399 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
400 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
401 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
402 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
403 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
404 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
405 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
406 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
407 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
408 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
409 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
410 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
411 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
412 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
413 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
414 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
415 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
416 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
417 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
418 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
419 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
420 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
421 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
422 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
423 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
424 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
425 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
426 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
427 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
428 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
429 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
430 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
431 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
432 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
433 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
434 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
435 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
436 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
437 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
438 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
439 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
440 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
441 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
442 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
443 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
444 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
445 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
446 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
447 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
448 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
449 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
450 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
451 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
452 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
453 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
454 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
455 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
456 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
457 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
458 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
459 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
460 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
461 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
462 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
463 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
464 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
465 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
466 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
467 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
468 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
469 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
470 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
471 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
472 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
473 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
474 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
475 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
476 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
477 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
478 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
479 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
480 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
481 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
482 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
483 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
484 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
485 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
486 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
487 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
488 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
489 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
490 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
491 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
492 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
493 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
494 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
495 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
496 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
497 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
498 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
499 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
500 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
501 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
502 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
503 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
504 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
505 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
506 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
507 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
508 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
509 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880
510 libSkiaSharp                    0x0000000100c25790 0x100a3c000 + 2004880

Thread 1:
0   libsystem_kernel.dylib          0x0000000183679d84 0x183657000 + 142724
1   libsystem_pthread.dylib         0x0000000183817eb4 0x183817000 + 3764
2   libsystem_pthread.dylib         0x0000000183817b08 0x183817000 + 2824

Thread 2 name:  SGen worker
Thread 2:
0   libsystem_kernel.dylib          0x00000001836790f4 0x183657000 + 139508
1   libsystem_pthread.dylib         0x000000018381bc90 0x183817000 + 19600
2   CrashWhenDrawingPolygon         0x0000000100715c5c 0x100428000 + 3071068
3   libsystem_pthread.dylib         0x0000000183819220 0x183817000 + 8736
4   libsystem_pthread.dylib         0x0000000183819110 0x183817000 + 8464
5   libsystem_pthread.dylib         0x0000000183817b10 0x183817000 + 2832

Thread 3 name:  Finalizer
Thread 3:
0   libsystem_kernel.dylib          0x0000000183657e44 0x183657000 + 3652
1   CrashWhenDrawingPolygon         0x0000000100674de0 0x100428000 + 2412000
2   CrashWhenDrawingPolygon         0x00000001006cf338 0x100428000 + 2782008
3   libsystem_pthread.dylib         0x0000000183819220 0x183817000 + 8736
4   libsystem_pthread.dylib         0x0000000183819110 0x183817000 + 8464
5   libsystem_pthread.dylib         0x0000000183817b10 0x183817000 + 2832

Thread 4:
0   libsystem_pthread.dylib         0x0000000183817b04 0x183817000 + 2820

Thread 5:
0   libsystem_pthread.dylib         0x0000000183817b04 0x183817000 + 2820

Thread 6 name:  com.apple.uikit.eventfetch-thread
Thread 6:
0   libsystem_kernel.dylib          0x0000000183657e08 0x183657000 + 3592
1   libsystem_kernel.dylib          0x0000000183657c80 0x183657000 + 3200
2   CoreFoundation                  0x0000000183b9ae40 0x183aad000 + 974400
3   CoreFoundation                  0x0000000183b98908 0x183aad000 + 964872
4   CoreFoundation                  0x0000000183ab8da8 0x183aad000 + 48552
5   Foundation                      0x000000018452d674 0x184525000 + 34420
6   Foundation                      0x000000018452d51c 0x184525000 + 34076
7   UIKit                           0x000000018d7ba768 0x18d7b8000 + 10088
8   Foundation                      0x000000018463defc 0x184525000 + 1150716
9   libsystem_pthread.dylib         0x0000000183819220 0x183817000 + 8736
10  libsystem_pthread.dylib         0x0000000183819110 0x183817000 + 8464
11  libsystem_pthread.dylib         0x0000000183817b10 0x183817000 + 2832

Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x00000001068f1e38   x1: 0x00000001068f1df0   x2: 0x000000016f9d3a40   x3: 0x000000016f9d3a40
    x4: 0x00000001068f5f40   x5: 0x0000000000000003   x6: 0x0000000000000000   x7: 0x0000000000000000
    x8: 0x00000001068f4d20   x9: 0x00000001068f5e08  x10: 0x00000001068f5ea8  x11: 0x00000001068f5ee8
   x12: 0x00000001068f1e20  x13: 0x00000001068f5e50  x14: 0x0000000000000008  x15: 0x00000001064b6bb0
   x16: 0x000000018380ed00  x17: 0x0000000088023a03  x18: 0x0000000000000000  x19: 0x000000016f9d3a40
   x20: 0x000000016f9d3970  x21: 0x00000001068f1e38  x22: 0x00000001068f5ea8  x23: 0x00000001068f5e08
   x24: 0x00000001068f1df0  x25: 0x000000016f9d3970  x26: 0x000000016f9d3978  x27: 0x0000000000000001
   x28: 0x000000016f9d3c38   fp: 0x000000016f8dc050   lr: 0x0000000100c25fa4
    sp: 0x000000016f8dc030   pc: 0x0000000100c25530 cpsr: 0x20000000

Binary Images:
0x100428000 - 0x1007b3fff CrashWhenDrawingPolygon arm64  <a1a3e5ecbd5a32a78685e43e6db907c5> /var/containers/Bundle/Application/3BF3D41F-AC82-4F4A-B950-CD200A28FEB4/CrashWhenDrawingPolygon.app/CrashWhenDrawingPolygon
0x1009a8000 - 0x1009e3fff dyld arm64  <b15e536a710732dabfafece44c5685e4> /usr/lib/dyld
0x100a3c000 - 0x100e3bfff libSkiaSharp arm64  <f2a1e2057a273b549577cad6839478a2> /var/containers/Bundle/Application/3BF3D41F-AC82-4F4A-B950-CD200A28FEB4/CrashWhenDrawingPolygon.app/Frameworks/libSkiaSharp.framework/libSkiaSharp
0x182d27000 - 0x182d28fff libSystem.B.dylib arm64  <f3beb9029e533a899d794429fec383f9> /usr/lib/libSystem.B.dylib
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0x18771e000 - 0x187c56fff AudioToolbox arm64  <00ebb5415151360e93a8e7c34a5ea583> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox
0x187c57000 - 0x187e8afff QuartzCore arm64  <ff65dcba3de33ba0ac83e85ce0f818d1> /System/Library/Frameworks/QuartzCore.framework/QuartzCore
0x187e8b000 - 0x187e96fff MediaAccessibility arm64  <89490c32b66e34ff93f20afaf15609bc> /System/Library/Frameworks/MediaAccessibility.framework/MediaAccessibility
0x187e97000 - 0x187f89fff libiconv.2.dylib arm64  <5bb51259bae432f794e0f85063453873> /usr/lib/libiconv.2.dylib
0x187fa6000 - 0x187fc1fff MPSCore arm64  <2d9261aaa9653984b3afe2e2eb5e21a7> /System/Library/Frameworks/MetalPerformanceShaders.framework/Frameworks/MPSCore.framework/MPSCore
0x187fc2000 - 0x18802afff MPSImage arm64  <5753222b2a7c33b99e185c0946d866d6> /System/Library/Frameworks/MetalPerformanceShaders.framework/Frameworks/MPSImage.framework/MPSImage
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EOF

CrashWhenDrawingPolygon-2018-06-30-125327.ips.zip

Btw. when using SKGLView I get now and than artefacts like missing points, so that more parts are red than there should be or parts not red.

[mattleibow]

This appears to be a bug in skia itself. What you can do is try the latest update and see if it goes away.

I have been working in a branch, and CI has created some output:

• SkiaSharp.1.67.0-build-190.nupkg
• SkiaSharp.Views.1.67.0-build-190.nupkg
• SkiaSharp.Views.Forms.1.67.0-build-190.nupkg

Please note that these files are still in preview and this bot only produces the macOS bits (iOS, Android, tvOS, watchOS, macOS). I hope to release a version this week - even if just a preview release.

Let me know if you have any questions.

[mattleibow]

I can't say for certain - because much has changed - but it may also have to do with this issue: https://github.com/mono/SkiaSharp/issues/647

[pauldendulk]

I can not reproduce the crash when updating the test project with v1.68.0-preview28.