diff options
Diffstat (limited to 'src/io')
| -rw-r--r-- | src/io/io.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/io/io.go b/src/io/io.go index 630ab73b56..946ea5b01c 100644 --- a/src/io/io.go +++ b/src/io/io.go @@ -14,6 +14,7 @@ package io import ( "errors" + "internal/race" "sync" ) @@ -427,6 +428,14 @@ func copyBuffer(dst Writer, src Reader, buf []byte) (written int64, err error) { nr, er := src.Read(buf) if nr > 0 { nw, ew := dst.Write(buf[0:nr]) + if race.Enabled { + // Write over the buffer to help the race detector + // detect Write calls that access the buffer after returning. + // Use something other than zeros to make errors more obvious. + for i := range buf[:nr] { + buf[i] = 0xdd + } + } if nw < 0 || nr < nw { nw = 0 if ew == nil { |