mut_list_size calculation is off
Program:
main = print (foldr (+) 0 [ 0 .. 10000 ] :: Int)
Compile:
$ ghc-stage2 Main.hs -debug -rtsopts -O0
Run:
$ ./Main +RTS -Dg
It prints something like
mut_list_size: 16 (0 vars, 0 arrays, 0 MVARs, 0 TVARs, 0 TVAR_WATCH_QUEUEs, 0 TREC_CHUNKs, 0 TREC_HEADERs, 0 ATOMIC_INVARIANTs, 0 INVARIANT_CHECK_QUEUEs, 0 others)
So there are two objects in the mut list, but scavenge_mutable_list
wasn't able to find anything. This is curious, and it seems like a bug.
Pretty much any program has this bug, mut_list_size
and sum of objects found in the mut list never match.
Trac metadata
Trac field | Value |
---|---|
Version | 8.5 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | lowest |
Resolution | Unresolved |
Component | Runtime System |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | bgamari, simonmar |
Operating system | |
Architecture |