我在kobo上读pdf完全依赖koreader，但有些pdf文件在翻页的时候会把koreader弄崩溃。查看koreader根目录下的crash.log，得到如下报错信息
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warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-GB1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
warning: ... repeated 2 times...
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-GB1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-GB1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-Japan1-UCS2)
warning: non-embedded font using identity encoding: SimHei (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: ArialUnicodeMS (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-GB1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-Japan1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
warning: ... repeated 2 times...
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-Japan1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-GB1-UCS2)
08/19/24-01:11:18 WARN Running low on memory (~11%, ~59.21/495 MiB), evicting half of the cache...
08/19/24-01:11:22 WARN Running low on memory (~14%, ~70.57/495 MiB), evicting half of the cache...
warning: ... repeated 2 times...
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: AngsanaUPC (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-Japan1-UCS2)
warning: non-embedded font using identity encoding: MingLiU (mapping via Adobe-CNS1-UCS2)
08/19/24-01:11:41 WARN Running low on memory (~2%, ~14.48/495 MiB), evicting half of the cache...
08/19/24-01:11:43 WARN Running low on memory (~1%, ~9.49/495 MiB), evicting half of the cache...
warning: ... repeated 2 times...
warning: dropping unclosed PDF processor
./luajit: ./ffi/mupdf.lua:71: cannot calculate bbox for page: realloc (7661467 bytes) failed (0)
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non-embedded font using identity encoding意思是文件里有非内嵌字体在使用身份编码，估计是编码占了太多内存导致koreader崩溃了。
用福昕打开pdf，file-properties-font里可以查看pdf文件用的字体。一般来说即使字体没有内嵌，字体名称只要和true font一致，也不会有问题。遇到字体名称和true font不一致的，用foxit pdf printer再打印一份，打的时候把properties里embed font的选项勾上就可以了。