#7185: Compiled program crashes
---------------------------+------------------------------------------------
Reporter: waldheinz | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: Runtime crash | Testcase:
Blockedby: | Blocking:
Related: |
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I have a program which compiles fine, but the resulting executable
crashes. First the steps to reproduce:
{{{
git clone g...@github.com:waldheinz/bling.git
git checkout e2bad3ca6be2409386d28796997709318cf6ff64
cabal configure
cabal build
./dist/build/bling/bling examples/cornell-box-underwater.bling
}}}
This will result in either a segfault or produce an "internal error"
message, at least for me and two other who tried it as well. The error
message is
{{{
bling: internal error: scavenge_one: strange object -1083673327
(GHC version 7.7.20120823 for x86_64_unknown_linux)
}}}
The "strange object" varies. Some random observations which might be
useful:
* this happens with GHC 7.4.1 and a fresh compile of HEAD (GHC version
7.7.20120823)
* I sanitized the code to be completely free of unsafe* function calls.
Before, there was quite some unsafe array reading/writing using the vector
package. This did not change anything, but the revision above reflects
this "safe" state, just in case...
* the problem first occured when I change the SPPM.mkHash function to
use the Utils.GrowVec type instead of lists for it's intermediate results.
[1] GrowVec is basically a wrapper around a vector which doubles the size
when space is exhausted.
* the optimization level does not seem to affect the problem (it occurs
even with -O0 and everything else removed)
Running under GDB gives this stack trace:
{{{
#1 0x00000031d12370d8 in abort () from /lib64/libc.so.6
#2 0x0000000000cb4765 in rtsFatalInternalErrorFn ()
#3 0x0000000000cb48dd in barf ()
#4 0x0000000000cd30e9 in scavenge_one ()
#5 0x0000000000cd3645 in scavenge_mutable_list ()
#6 0x0000000000cd3835 in scavenge_capability_mut_lists ()
#7 0x0000000000cb98bc in GarbageCollect ()
#8 0x0000000000cac043 in scheduleDoGC.isra.20 ()
#9 0x0000000000cacabf in scheduleWaitThread ()
#10 0x0000000000cb683e in real_main ()
#11 0x0000000000cb693a in hs_main ()
#12 0x0000000000407003 in main ()
}}}
I'm currently trying to debug this further, but my abilities on this front
are limited...
[1]
https://github.com/waldheinz/bling/commit/e1dc7b3c7e66cdd21a5aa46f9f96ca9448c52407#commitcomment-1761893
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7185>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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