diff options
| -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 e74a451d0d..fb5c488ffc 100644 --- a/src/runtime/mgcsweep.go +++ b/src/runtime/mgcsweep.go @@ -405,7 +405,10 @@ func reimburseSweepCredit(unusableBytes uintptr) { // Nobody cares about the credit. Avoid the atomic. return } - if int64(atomic.Xadd64(&mheap_.spanBytesAlloc, -int64(unusableBytes))) < 0 { + nval := atomic.Xadd64(&mheap_.spanBytesAlloc, -int64(unusableBytes)) + if int64(nval) < 0 { + // Debugging for #18043. + print("runtime: bad spanBytesAlloc=", nval, " (was ", nval+uint64(unusableBytes), ") unusableBytes=", unusableBytes, " sweepPagesPerByte=", mheap_.sweepPagesPerByte, "\n") throw("spanBytesAlloc underflow") } } |