id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related 4187,Seg fault with Text.Regex,kfisher,," I have been seeing ghci seg fault, hang, or exit with the error: "": memory allocation failed (requested 1948254208 bytes)"" when loading the following program into ghci (version 6.13.20100309) and asking for the value of re_result1:[[BR]] {{{ module Examples.RegExpTest where import qualified Text.Regex as RE re = RE.mkRegexWithOpts ""^a+"" True True re_results1 = RE.matchRegexAll re ""aaaab"" }}} Here is a sample session: {{{ babylon-2:/Users/kfisher/pads/dirpads/src>~/sw/ghc-head/bin/ghci GHCi, version 6.13.20100309: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package ffi-1.0 ... linking ... done. Prelude> :l Examples/RegExpTest.hs [1 of 1] Compiling Examples.RegExpTest ( Examples/RegExpTest.hs, interpreted ) Ok, modules loaded: Examples.RegExpTest. *Examples.RegExpTest> re_results1 Loading package array-0.3.0.0 ... linking ... done. Loading package bytestring-0.9.1.5 ... linking ... done. Loading package containers-0.3.0.0 ... linking ... done. Loading package mtl-1.1.0.2 ... linking ... done. Loading package regex-base-0.93.1 ... linking ... done. Loading package regex-posix-0.94.1 ... linking ... done. Loading package regex-compat-0.93.1 ... linking ... done. C-c C-cInterrupted. *Examples.RegExpTest> re_results1 Segmentation fault }}} The first time I asked for the value of re_result1 in the session above, the system seemed to go into an infinite loop, which I interrupted after about a minute. The second time, the system seg faulted. Sometimes, the system does return a value. For example, the first time I tried the above experiment after upgrading to Text.Regex version 0.93. However, it returned the value:[[BR]] {{{ Just ("""",""aaaa"",""b"",["""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""","""",[[BR]] """","""","""","""","""","""","""","""","""","""","""","""","""","""",""""]) }}} Another time, it returned the value:[[BR]] {{{ Just ("""",""aaaa"",""b"",[]) }}} which is what I was expecting. The first of these was run with a different set of command-line flags to ghci, so maybe that explains the value difference. ",bug,closed,normal,7.0.1,Runtime System,6.13,worksforme,,,MacOS X,x86,GHCi crash,,,,,