以下是出现死循环时的日志:

CoreGraphics PDF has logged an error. Set environment variable "CGPDFVERBOSE" to learn more.
2020-03-27 19:33:32.836 MarginNote X[59120:322135868] [iCloud] Beginning file update with NSMetadataQuery
2020-03-27 19:33:41.396 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.490 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.499 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.506 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.515 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.522 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.531 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.538 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.548 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.554 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.565 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.570 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.580 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.585 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.593 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.601 MarginNote X[59120:322135868] wheel:0
2020-03-27 19:33:41.609 MarginNote X[59120:322135868] wheel:1

...
CoreGraphics PDF has logged an error. Set environment variable "CGPDFVERBOSE" to learn more.
2020-03-27 19:35:00.610 MarginNote X[67440:322172910] wheel:0
2020-03-27 19:35:00.689 MarginNote X[67440:322172910] wheel:0
2020-03-27 19:35:21.647 MarginNote X[67440:322224960] [Error]: The request timed out. (Code: 100, Version: 1.14.2)
2020-03-27 19:35:21.647 MarginNote X[67440:322173405] [Warning]: Attempt at runEventually command timed out. Waiting 60
0.000000 seconds. 5 retries remaining.

点击编辑如图所示的地方时， 能重现问题.

以下是打开CGPDFVERBOSE时，出现的日志:

2020-03-27 19:42:50.362 MarginNote X[41000:322498201] [iCloud] Beginning file update with NSMetadataQuery
failed to find linearization cross-reference table.
failed to find linearization cross-reference table.
failed to find linearization cross-reference table.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
failed to find linearization cross-reference table.
failed to find linearization cross-reference table.
failed to find linearization cross-reference table.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
failed to find linearization cross-reference table.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
failed to find linearization cross-reference table.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
failed to find linearization cross-reference table.
failed to find linearization cross-reference table.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
Replacing TrueType font TimesNewRoman' withTimesNewRomanPSMT'.
failed to find linearization cross-reference table.

2020-03-27 19:43:46.306 MarginNote X[41000:322498261] [Error]: The request timed out. (Code: 100, Version: 1.14.2)
2020-03-27 19:43:46.307 MarginNote X[41000:322498240] [Warning]: Attempt at runEventually command timed out. Waiting 600.000000 seconds. 5 retries remaining.