#2317: Garbage collector crashes in simple parallel sorting program
----------------------------+-----------------------------------------------
Reporter: bos | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: Runtime System | Version: 6.8.2
Severity: major | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: Multiple
Os: Linux |
----------------------------+-----------------------------------------------
Changes (by simonmar):
* difficulty: => Unknown
* milestone: => 6.8.3
Old description:
> I have a very simple parallel program that crashes quite reproducibly.
> On x86-64 and x86-32, the symptoms are subtly different, but equally
> catastrophic.
>
> x86-64:
>
> {{{$ ghc -threaded -O2 --make -o Sorting Sorting
> [1 of 1] Compiling Main ( Sorting.hs, Sorting.o )
> Linking Sorting ...
> $ ./Sorting +RTS -N2 -RTS 100000
> 100000
> Segmentation fault}}}
>
> x86-32:
>
> {{{$ ghc -O2 --make -threaded -o Sorting Sorting
> [1 of 1] Compiling Main ( Sorting.hs, Sorting.o )
> Linking Sorting ...
> $ ./Sorting +RTS -N2 -RTS 125000
> 125000
> Sorting: internal error: evacuate: strange closure type 17805
> (GHC version 6.8.2 for i386_unknown_linux)
> Please report this as a GHC bug:
> http://www.haskell.org/ghc/reportabug
> Aborted}}}
>
> Here's a somewhat useless backtrace from gdb on x86-64:
>
> {{{#1 0x00007fb49eac2d83 in abort () at abort.c:88
> #2 0x0000000000444c45 in rtsFatalInternalErrorFn ()
> #3 0x0000000000444efc in barf ()
> #4 0x0000000000464c9c in evacuate ()
> #5 0x000000000044d213 in scavenge_stack ()
> #6 0x000000000044e4ba in scavenge_one ()
> #7 0x000000000044e8d6 in scavenge_mutable_list ()
> #8 0x000000000044bc49 in GarbageCollect ()
> #9 0x0000000000445d1f in scheduleDoGC ()
> #10 0x0000000000446ff8 in schedule ()
> #11 0x0000000000447339 in workerStart ()
> #12 0x0000000000f6c29a in start_thread (arg=<value optimized out>)
> at pthread_create.c:297
> #13 0x00007fb49eb732cd in clone () from /lib64/libc.so.6}}}
New description:
I have a very simple parallel program that crashes quite reproducibly. On
x86-64 and x86-32, the symptoms are subtly different, but equally
catastrophic.
x86-64:
{{{
$ ghc -threaded -O2 --make -o Sorting Sorting
[1 of 1] Compiling Main ( Sorting.hs, Sorting.o )
Linking Sorting ...
$ ./Sorting +RTS -N2 -RTS 100000
100000
Segmentation fault
}}}
x86-32:
{{{
$ ghc -O2 --make -threaded -o Sorting Sorting
[1 of 1] Compiling Main ( Sorting.hs, Sorting.o )
Linking Sorting ...
$ ./Sorting +RTS -N2 -RTS 125000
125000
Sorting: internal error: evacuate: strange closure type 17805
(GHC version 6.8.2 for i386_unknown_linux)
Please report this as a GHC bug:
http://www.haskell.org/ghc/reportabug
Aborted
}}}
Here's a somewhat useless backtrace from gdb on x86-64:
{{{
#1 0x00007fb49eac2d83 in abort () at abort.c:88
#2 0x0000000000444c45 in rtsFatalInternalErrorFn ()
#3 0x0000000000444efc in barf ()
#4 0x0000000000464c9c in evacuate ()
#5 0x000000000044d213 in scavenge_stack ()
#6 0x000000000044e4ba in scavenge_one ()
#7 0x000000000044e8d6 in scavenge_mutable_list ()
#8 0x000000000044bc49 in GarbageCollect ()
#9 0x0000000000445d1f in scheduleDoGC ()
#10 0x0000000000446ff8 in schedule ()
#11 0x0000000000447339 in workerStart ()
#12 0x0000000000f6c29a in start_thread (arg=<value optimized out>)
at pthread_create.c:297
#13 0x00007fb49eb732cd in clone () from /lib64/libc.so.6
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2317#comment:2>
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