profile.pl (llvm-prof) crash

Hi all,

I've been trying to profile with profile.pl, and the output I get always end
up crashing with the following assert:
lvm-prof: FoldingSet.cpp:184: void** GetBucketPtr(void*): Assertion `(Ptr &
1) && "Not a bucket pointer"' failed.

(This is after it runs successfully for a while, giving me the function and
basic block frequencies).

Am I doing something wrong (I run profile.pl testfile.bc for some test
file)?

Thanks,
Guy