The extractor is generating invalid SPARQL for a PDF file.
Tracker version: 3.0.1
The file: Silva_2009_Crise_da_ditadura_militar_e_o_processo_de_abertura_política_no_Brasil__1974-1985.pdf
The error:
$ cat .cache/tracker3/files/errors/77322106140dc2bcc2e57ee9639241b8
[Report]
Uri=file:///var/mnt/home/home/dread/Documents/estudos/Hist%C3%B3ria%20-%20Mestrado%20-%20UFSC%20(2018-2019)/2018.2%20-%202%20semestre/disciplinas/HST%203333003%20-%20Est%C3%A1gio%20Doc%C3%AAncia/HST%207602%20-%20Hist%C3%B3ria%20do%20Brasil%20Republicano%20II/Textos%20dos%20semin%C3%A1rios%20(vers%C3%B5es%20melhoradas%20por%20Felipe)/III%20%E2%80%93%201986-2009/5%20-%20Governos%20p%C3%B3s-ditadura%20militar/Silva_2009_Crise%20da%20ditadura%20militar%20e%20o%20processo%20de%20abertura%20pol%C3%ADtica%20no%20Brasil,%201974-1985.pdf
Message=SparqlTimeSort helper: Failed time string conversion (strerror of errno (not necessarily related): Resource temporarily unavailable)
Sparql=INSERT DATA { GRAPH tracker:FileSystem { <file:///var/mnt/home/home/dread/Documents/estudos/Hist%C3%B3ria%20-%20Mestrado%20-%20UFSC%20(2018-2019)/2018.2%20-%202%20semestre/disciplinas/HST%203333003%20-%20Est%C3%A1gio%20Doc%C3%AAncia/HST%207602%20-%20Hist%C3%B3ria%20do%20Brasil%20Republicano%20II/Textos%20dos%20semin%C3%A1rios%20(vers%C3%B5es%20melhoradas%20por%20Felipe)/III%20%E2%80%93%201986-2009/5%20-%20Governos%20p%C3%B3s-ditadura%20militar/Silva_2009_Crise%20da%20ditadura%20militar%20e%20o%20processo%20de%20abertura%20pol%C3%ADtica%20no%20Brasil,%201974-1985.pdf> tracker:extractorHash "9f3e4118b613f560ccdebcee36846f09695c584997fa626eb72d556f8470697f" . }}; DELETE WHERE {\nGRAPH <http://tracker.api.gnome.org/ontology/v3/tracker#Documents> {\n <urn:contact:Francisco%20Carlos%20Teixeira%20da%20Silva> nco:fullname ?nco_fullname } };\nDELETE WHERE {\nGRAPH <http://tracker.api.gnome.org/ontology/v3/tracker#Documents> {\n <urn:contact:Francisco%20Carlos%20Teixeira%20da%20Silva> rdf:type ?rdf_type } };\nINSERT DATA {\nGRAPH <http://tracker.api.gnome.org/ontology/v3/tracker#Documents> {\n<urn:contact:Francisco%20Carlos%20Teixeira%20da%20Silva> a nco:Contact ; \n nco:fullname "Francisco Carlos Teixeira da Silva" .\n<file:///var/mnt/home/home/dread/Documents/estudos/Hist%C3%B3ria%20-%20Mestrado%20-%20UFSC%20(2018-2019)/2018.2%20-%202%20semestre/disciplinas/HST%203333003%20-%20Est%C3%A1gio%20Doc%C3%AAncia/HST%207602%20-%20Hist%C3%B3ria%20do%20Brasil%20Republicano%20II/Textos%20dos%20semin%C3%A1rios%20(vers%C3%B5es%20melhoradas%20por%20Felipe)/III%20%E2%80%93%201986-2009/5%20-%20Governos%20p%C3%B3s-ditadura%20militar/Silva_2009_Crise%20da%20ditadura%20militar%20e%20o%20processo%20de%20abertura%20pol%C3%ADtica%20no%20Brasil,%201974-1985.pdf> nie:interpretedAs _:593525 .\n_:593525 a nfo:PaginatedTextDocument , nfo:PaginatedTextDocument ; \n nco:creator <urn:contact:Francisco%20Carlos%20Teixeira%20da%20Silva> ; \n nie:description "" ; \n nie:mimeType "application/pdf" ; \n nie:isStoredAs <file:///var/mnt/home/home/dread/Documents/estudos/Hist%C3%B3ria%20-%20Mestrado%20-%20UFSC%20(2018-2019)/2018.2%20-%202%20semestre/disciplinas/HST%203333003%20-%20Est%C3%A1gio%20Doc%C3%AAncia/HST%207602%20-%20Hist%C3%B3ria%20do%20Brasil%20Republicano%20II/Textos%20dos%20semin%C3%A1rios%20(vers%C3%B5es%20melhoradas%20por%20Felipe)/III%20%E2%80%93%201986-2009/5%20-%20Governos%20p%C3%B3s-ditadura%20militar/Silva_2009_Crise%20da%20ditadura%20militar%20e%20o%20processo%20de%20abertura%20pol%C3%ADtica%20no%20Brasil,%201974-1985.pdf> ; \n nfo:pageCount 41 ; \n nie:plainTextContent "" ; \n nie:title "Crise da ditadura militar e o processo de abertura política no Brasil, 1974-1985" ; \n nie:contentCreated "0100-12-31T21:00:00-03:00" .\n}\n};\n
$
More info:
$ G_MESSAGES_DEBUG=Tracker TRACKER_DEBUG=all tracker3 extract Silva_2009_Crise\ da\ ditadura\ militar\ e\ o\ processo\ de\ abertura\ política\ no\ Brasil\,\ 1974-1985.pdf
(tracker-extract-3:16654): Tracker-DEBUG: 11:54:41.308: MIME type guessed as 'application/pdf' (from GIO)
(tracker-extract-3:16654): Tracker-DEBUG: 11:54:41.319: Using /usr/lib64/tracker-miners-3.0/extract-modules/libextract-pdf.so...
(tracker-extract-3:16654): Tracker-DEBUG: 11:54:41.321: Extracted 0 bytes from page 0, 1048576 bytes remaining
(tracker-extract-3:16654): Tracker-DEBUG: 11:54:41.321: Extracted 0 bytes from page 1, 1048576 bytes remaining
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(tracker-extract-3:16654): Tracker-DEBUG: 11:54:41.326: Content extraction finished: 41/41 pages indexed in 0,01 seconds, 0 bytes extracted
@prefix nie: <http://tracker.api.gnome.org/ontology/v3/nie#> .
@prefix nfo: <http://tracker.api.gnome.org/ontology/v3/nfo#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix nco: <http://tracker.api.gnome.org/ontology/v3/nco#> .
<urn:contact:Francisco%20Carlos%20Teixeira%20da%20Silva> nco:fullname "Francisco Carlos Teixeira da Silva" ;
a nco:Contact .
<file:///var/mnt/home/home/dread/Documents/estudos/Hist%C3%B3ria%20-%20Mestrado%20-%20UFSC%20(2018-2019)/2018.2%20-%202%20semestre/disciplinas/HST%203333003%20-%20Est%C3%A1gio%20Doc%C3%AAncia/HST%207602%20-%20H>
nie:plainTextContent "" ;