#4187: Seg fault with Text.Regex
------------------------+---------------------------------------------------
Reporter: kfisher | Owner:
Type: bug | Status: new
Priority: normal | Component: Runtime System
Version: 6.13 | Keywords:
Os: MacOS X | Testcase:
Architecture: x86 | Failure: GHCi crash
------------------------+---------------------------------------------------
I have been seeing ghci seg fault, hang, or exit with the error:
"<interactive>: 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.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4187>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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