I am trying to convert a large text HTML file(5.2 MB) to MOBI. Smaller versions of the same pool of files work without problem, and I've recorded similar problems with files as small as 3.5 MB, at which point it seems to be chance whether or not the file will convert. There are no deviations in the conversion option from "normal".
I am using the Ubuntu version of the software, so if you aren't using Linux you'll probably not be able to recreate the error.
Spoiler:
Conversion Error: Convert book 1 of 1 (This Platinum Crown-45-55)
Convert book 1 of 1 (This Platinum Crown-45-55)
Processing archive...
Resolved conversion options
calibre version: 1.25.0
{'asciiize': False,
'author_sort': None,
'authors': None,
'base_font_size': 0.0,
'book_producer': None,
'breadth_first': False,
'change_justification': u'original',
'chapter': u"//*[((name()='h1' or name()='h2') and re:test(., '\\s*((chapter|book|section|part)\\s+)|((prolog|pr ologue|epilogue)(\\s+|$))', 'i')) or @class = 'chapter']",
'chapter_mark': u'pagebreak',
'comments': None,
'cover': None,
'debug_pipeline': None,
'dehyphenate': True,
'delete_blank_paragraphs': True,
'disable_font_rescaling': False,
'dont_compress': False,
'dont_package': False,
'duplicate_links_in_toc': False,
'embed_all_fonts': False,
'embed_font_family': None,
'enable_heuristics': False,
'expand_css': False,
'extra_css': None,
'extract_to': None,
'filter_css': u'',
'fix_indents': True,
'font_size_mapping': None,
'format_scene_breaks': True,
'html_unwrap_factor': 0.4,
'input_encoding': None,
'input_profile': <calibre.customize.profiles.InputProfile object at 0x7f9a7ed92bd0>,
'insert_blank_line': False,
'insert_blank_line_size': 0.5,
'insert_metadata': False,
'isbn': None,
'italicize_common_cases': True,
'keep_ligatures': False,
'language': None,
'level1_toc': None,
'level2_toc': None,
'level3_toc': None,
'line_height': 0.0,
'linearize_tables': False,
'margin_bottom': 5.0,
'margin_left': 5.0,
'margin_right': 5.0,
'margin_top': 5.0,
'markup_chapter_headings': True,
'max_levels': 5,
'max_toc_links': 50,
'minimum_line_height': 120.0,
'mobi_file_type': u'old',
'mobi_ignore_margins': False,
'mobi_keep_original_images': False,
'mobi_toc_at_start': False,
'no_chapters_in_toc': False,
'no_inline_navbars': True,
'no_inline_toc': False,
'output_profile': <calibre.customize.profiles.KindleDXOutput object at 0x7f9a7eb312d0>,
'page_breaks_before': u"//*[name()='h1' or name()='h2']",
'personal_doc': u'[PDOC]',
'prefer_author_sort': False,
'prefer_metadata_cover': False,
'pretty_print': False,
'pubdate': None,
'publisher': None,
'rating': None,
'read_metadata_from_opf': u'/tmp/calibre_1.25.0_tmp_BLmSCC/tEIYfF.opf',
'remove_fake_margins': True,
'remove_first_image': False,
'remove_paragraph_spacing': False,
'remove_paragraph_spacing_indent_size': 1.5,
'renumber_headings': True,
'replace_scene_breaks': u'',
'search_replace': '[]',
'series': None,
'series_index': None,
'share_not_sync': False,
'smarten_punctuation': False,
'sr1_replace': None,
'sr1_search': None,
'sr2_replace': None,
'sr2_search': None,
'sr3_replace': None,
'sr3_search': None,
'start_reading_at': None,
'subset_embedded_fonts': False,
'tags': None,
'timestamp': None,
'title': None,
'title_sort': None,
'toc_filter': None,
'toc_threshold': 6,
'toc_title': None,
'unsmarten_punctuation': False,
'unwrap_lines': True,
'use_auto_toc': False,
'verbose': 2}
InputFormatPlugin: HTML Input running
on /tmp/calibre_1.25.0_tmp_BLmSCC/gV7drt_pl_arc/content.opf
Parsing all content...
Manifest item 'toc.ncx' not found
Parsing This Platinum Crown-45-55.html ...
Generating default TOC from spine...
Merging user specified metadata...
Detecting structure...
Maximum TOC links reached, stopping.
Auto generated TOC with 50 entries.
Flattening CSS and remapping font sizes...
Source base font size is 12.00000pt
Removing fake margins...
Found 22 items of level: p_2
Found 26150 items of level: p_1
Ignoring level p_2
p_1 left margin stats: Counter({u'0': 26150})
p_1 right margin stats: Counter({u'0': 26150})
Cleaning up manifest...
Trimming unused files from manifest...
Creating MOBI Output...
Serializing resources...
Creating MOBI 6 output
Generating in-line TOC...
Applying case-transforming CSS...
Parsing manglecase.css ...
Parsing tocstyle.css ...
Rasterizing SVG images...
Converting XHTML to Mobipocket markup...
Serializing markup content...
Compressing markup content...
Generating MOBI index for a book
MOBI output written to /tmp/calibre_1.25.0_tmp_BLmSCC/ZPbQ81.mobi
ICE default IO error handler doing an exit(), pid = 7308, errno = 32
(Yes, this is fanfic, but I've seen the error so often on other large files as well)