This bug was fixed in the package lua-lpeg - 1.0.0-2ubuntu1

---------------
lua-lpeg (1.0.0-2ubuntu1) focal; urgency=medium

  * d/p/stop-hascaptures-recursion.patch: Fix infinite recursion in
    hascaptures(). (LP: #1580385)

 -- Victor Tapia <victor.ta...@canonical.com>  Wed, 02 Oct 2019 17:49:19
+0200

** Changed in: lua-lpeg (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1580385

Title:
  /usr/bin/nmap:11:hascaptures:hascaptures:hascaptures:hascaptures:hascaptures

Status in lua-lpeg package in Ubuntu:
  Fix Released
Status in lua-lpeg source package in Xenial:
  New
Status in lua-lpeg source package in Bionic:
  New
Status in lua-lpeg source package in Disco:
  New
Status in lua-lpeg source package in Eoan:
  New
Status in lua-lpeg package in Debian:
  New

Bug description:
  [Impact]

  Under certain conditions, lpeg will crash while walking the pattern
  tree looking for TCapture nodes.

  [Test Case]

  The reproducer, taken from an upstream discussion (link in "Other
  info"), is:

  $ cat repro.lua
  #!/usr/bin/env lua
  lpeg = require "lpeg"

  p = lpeg.C(-lpeg.P{lpeg.P'x' * lpeg.V(1) + lpeg.P'y'})
  p:match("xx")

  The program crashes due to a hascaptures() infinite recursion:

  $ ./repro.lua
  Segmentation fault (core dumped)

  (gdb) bt -25
  #523984 0x00007ffff7a3743c in hascaptures () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523985 0x00007ffff7a3743c in hascaptures () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523986 0x00007ffff7a3743c in hascaptures () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523987 0x00007ffff7a3743c in hascaptures () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523988 0x00007ffff7a3743c in hascaptures () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523989 0x00007ffff7a3743c in hascaptures () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523990 0x00007ffff7a3815c in ?? () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523991 0x00007ffff7a388e3 in compile () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523992 0x00007ffff7a36fab in ?? () from 
/usr/lib/x86_64-linux-gnu/lua/5.2/lpeg.so
  #523993 0x000055555555fd1e in ?? ()
  #523994 0x000055555556a5fc in ?? ()
  #523995 0x00005555555600c8 in ?? ()
  #523996 0x000055555555f63f in ?? ()
  #523997 0x000055555556030f in ?? ()
  #523998 0x000055555555dc91 in lua_pcallk ()
  #523999 0x000055555555b896 in ?? ()
  #524000 0x000055555555c54b in ?? ()
  #524001 0x000055555555fd1e in ?? ()
  #524002 0x0000555555560092 in ?? ()
  #524003 0x000055555555f63f in ?? ()
  #524004 0x000055555556030f in ?? ()
  #524005 0x000055555555dc91 in lua_pcallk ()
  #524006 0x000055555555b64b in ?? ()
  #524007 0x00007ffff7c94bbb in __libc_start_main (main=0x55555555b5f0, argc=2, 
argv=0x7fffffffe6d8, init=<optimized out>, fini=<optimized out>, 
rtld_fini=<optimized out>, stack_end=0x7fffffffe6c8)
      at ../csu/libc-start.c:308
  #524008 0x000055555555b70a in ?? ()

  The expected behavior is to have the program finish normally

  [Regression potential]

  Low, this is a backport from upstream and only limits the infinite recursion 
in a scenario where it shouldn't happen to begin with (TCapture node search).
  [Other info]

  This was fixed upstream in 1.0.1 by stopping the recursion in TCall
  nodes and controlling that TRule nodes do not follow siblings (sib2)

  The upstream discussion can be found here:
  http://lua.2524044.n2.nabble.com/LPeg-intermittent-stack-exhaustion-
  td7674831.html

  My analysis can be found here:
  http://pastebin.ubuntu.com/p/n4824ftZt9/plain/

  [Original description]

  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding nmap.  This problem was most recently seen with version
  7.01-2ubuntu2, the problem page at
  https://errors.ubuntu.com/problem/5e852236a443bab0279d47c8a9b7e55802bfb46f
  contains more details.

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