[Issue 20855] New: segfault when compiling large file

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20855

          Issue ID: 20855
           Summary: segfault when compiling large file
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: kilianhanich at gmx.de

Created attachment 1790
  --> https://issues.dlang.org/attachment.cgi?id=1790&action=edit
source file and terminal output

I tried to do a D compiler benchmark between DMD and GDC (GNU's D compiler).
I haven't done this so far, so I guessed that you can test the parsing speed
with compiling very large files (and the Internet seemed to say that too).
So, when compiling this file (which is manually unrolled loop of 100.000 times
the line "a = b+c*d + a;", DMD segfaults.
It happened every time I tried it, so it should be easily reproducible.
My environment is Kubuntu 18.04 with DMD version 2.092.0 (like seen in the
screenshot).
The overwritten things in the screenshot is the Hostname (and Username).
Because it unlikely that that big files are going to get parsed (and file with
the same code but fewer lines were fine), I put the Severity on minor.

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