diff options
Diffstat (limited to 'src/runtime')
| -rw-r--r-- | src/runtime/mgcsweep.go | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/runtime/mgcsweep.go b/src/runtime/mgcsweep.go index 2d84c0d07c..0fbb23d573 100644 --- a/src/runtime/mgcsweep.go +++ b/src/runtime/mgcsweep.go @@ -796,7 +796,10 @@ func (sl *sweepLocked) sweep(preserve bool) bool { s := spanOf(uintptr(unsafe.Pointer(s.largeType))) mheap_.freeManual(s, spanAllocPtrScalarBits) }) - s.largeType = nil + // Make sure to zero this pointer without putting the old + // value in a write buffer, as the old value might be an + // invalid pointer. See arena.go:(*mheap).allocUserArenaChunk. + *(*uintptr)(unsafe.Pointer(&s.largeType)) = 0 } // Count the free in the consistent, external stats. |