043f112e52
Currently, wbBufFlush does nothing if the goroutine is dying on the assumption that the system is crashing anyway and running the write barrier may crash it even more. However, it fails to reset the buffer's "next" pointer. As a result, if there are later write barriers on the same P, the write barrier will overflow the write barrier buffer and start corrupting other fields in the P or other heap objects. Often, this corrupts fields in the next allocated P since they tend to be together in the heap. Fix this by always resetting the buffer's "next" pointer, even if we're not doing anything with the pointers in the buffer. Updates #22987 and #22988. (May fix; it's hard to say.) Change-Id: I82c11ea2d399e1658531c3e8065445a66b7282b2 Reviewed-on: https://go-review.googlesource.com/83016 Run-TryBot: Austin Clements <austin@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rick Hudson <rlh@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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The Go Programming Language
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