#5386: GHCi crashes with SIGFPE when using double-conversion package
---------------------------------+------------------------------------------
Reporter: bos | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 7.0.4 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: GHCi crash
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Comment(by bos):
I've narrowed the source of the bug down.
The crash occurs on [https://github.com/mailrank/double-
conversion/blob/master/double-conversion/src/cached-powers.cc#L153 line
153 of cached-powers.cc] in the double-conversion source, where a divide
by zero occurs because `kDecimalExponentDistance` is zero.
Now it's clear from [https://github.com/mailrank/double-
conversion/blob/master/double-conversion/src/cached-powers.cc#L137 the
definition of that variable] that it should not be zero; its value should
be 8.
However, on inspecting the symbols in the compiled source file, I see that
the symbol for `kDecimalExponentDistance` is actually in the BSS section
of the object file. It looks like its value is supposed to be computed at
startup time by an initializer, which I assume is the first symbol in the
list below:
{{{
00000000 t
_GLOBAL__sub_I__ZN17double_conversion16PowersOfTenCache24kDecimalExponentDistanceE
00000000 B double_conversion::PowersOfTenCache::kMaxDecimalExponent
00000004 B double_conversion::PowersOfTenCache::kMinDecimalExponent
00000008 B double_conversion::PowersOfTenCache::kDecimalExponentDistance
}}}
This is all a roundabout way of saying that the crash seems to be due to
GHCi not calling initializers.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5386#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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