Created attachment 1359135 [details]
EPS file which mentions Helvetica-Narrow-BoldOblique, and which fails to display with gs 9.22

Description of problem:
Font configuration of ghostscript in Resource/Init/Fontmap.GS refers to
NimbusSansNarrow-BdOblique (as an alias for Helvetica-Narrow-BoldOblique),
which cannot be found:

Running gs c1.eps (on the attachment) produces

Loading NimbusSansNarrow-Bold font from /usr/share/fonts/urw-base35/NimbusSansNarrow-Bold.t1... 9084404 7660552 11252216 9778935 2 done.
Can't find (or can't open) font file /usr/share/ghostscript/9.22/Resource/Font/NimbusSansNarrow-BdOblique.
Can't find (or can't open) font file NimbusSansNarrow-BdOblique.
Can't find (or can't open) font file /usr/share/ghostscript/9.22/Resource/Font/NimbusSansNarrow-BdOblique.
Can't find (or can't open) font file NimbusSansNarrow-BdOblique.
Didn't find this font on the system!
Unable to substitute for font.
Error: /invalidfont in /findfont
Operand stack:
   --nostringval--   Helvetica-Narrow-BoldOblique
Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1999   1   3   %oparray_pop   1998   1   3   %oparray_pop   --nostringval--   1982   1   3   %oparray_pop   1868   1   3   %oparray_pop   --nostringval--   %errorexec_pop   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   %array_continue   --nostringval--   1951   2   4   %oparray_pop
Dictionary stack:
   --dict:980/1684(ro)(G)--   --dict:0/20(G)--   --dict:82/200(L)--   --dict:67/80(L)--
Current allocation mode is local
Last OS error: Not a directory
Current file position is 6201
GPL Ghostscript 9.22: Unrecoverable error, exit code 1


Version-Release number of selected component (if applicable):
ghostscript-9.22-1.fc27.x86_64
urw-base35-fonts-20170801-2.fc27.noarch



How reproducible:
Always reproducible.  Attached EPS file is a minimum reproducer.


Steps to Reproduce:
Create EPS file which mentions font Helvetica-Narrow-BoldOblique (note that the
font needs not be used in the actual plot; the bug appears when the font is
mentioned in the Preamble).
Run gs, gv, or any other viewer/program which relies on ghostscript to display or otherwise show EPS files

Actual results:
Error, see above

Expected results:
EPS file is shown on display.

Additional info:
The following patch fixes the problem:
$ diff -u /usr/share/ghostscript/9.22/Resource/Init/Fontmap.GS.old /usr/share/ghostscript/9.22/Resource/Init/Fontmap.GS
--- /usr/share/ghostscript/9.22/Resource/Init/Fontmap.GS.old	2017-11-25 10:13:53.909366458 +0100
+++ /usr/share/ghostscript/9.22/Resource/Init/Fontmap.GS	2017-11-25 17:17:13.212881405 +0100
@@ -96,7 +96,7 @@
 /Helvetica-Bold			/NimbusSans-Bold ;
 /Helvetica-BoldOblique		/NimbusSans-BoldItalic      ;
 /Helvetica-Narrow-Bold		/NimbusSansNarrow-Bold    ;
-/Helvetica-Narrow-BoldOblique	/NimbusSansNarrow-BdOblique        ;
+/Helvetica-Narrow-BoldOblique	/NimbusSansNarrow-BoldOblique        ;
 /Helvetica-Narrow		/NimbusSansNarrow-Regular    ;
 /Helvetica-Narrow-Oblique	/NimbusSansNarrow-Oblique        ;
 /Helvetica			/NimbusSans-Regular ;


(It's the font name, not the file name, which seems to be relevant in Fontmap.GS).