Crash in messageBlackHole() on SPARC

Compile the attached program on a SPARC T2:

benl@greyarea$ ghc -Odph Main.hs -threaded -rtsopts

Run with a large number of threads:

benl@greyarea$ ./Main 4000000 +RTS -N32
Generating test data.
Computing hull.
Bus Error (core dumped)

GDB says:

#0  0x01b55334 in messageBlackHole ()
#1  0x01b55834 in executeMessage ()
#2  0x01b2ade0 in schedule ()
#3  0x01b2b900 in scheduleWorker ()
#4  0xff1c4910 in _lwp_start () from /lib/libc.so.1
#5  0xff1c4910 in _lwp_start () from /lib/libc.so.1

This is compiled against vector-0.7 and primitive-0.3.1. I'm not using unsafe vector functions. It crashes about 50% of the time with the given arguments. With a lower number of points (like 1000000) and less threads it still crashes but not as reliably. It always crashes in messageBlackHole(). Disabling the parallel GC with -qg doesn't help, nor does running with -H1000M. It runs fine on x86/OSX.

This patch:

Thu Jun 10 01:06:36 PDT 2010  Simon Marlow <marlowsd@gmail.com>
 * messageBlackHole: fix deadlock bug caused by a missing 'volatile'

didn't help, so it could be unrelated.

Trac metadata

Trac field	Value
Version	6.13
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
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