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a9b37ae026
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Austin Clements a9b37ae026 runtime: fully initialize span in alloc_m 
Currently, several important fields of a heap span are set by
heapBits.initSpan, which happens after the span has already been
published and returned from the locked region of alloc_m. In
particular, allocBits is set very late, which makes mspan.isFree
unsafe even if you were to lock the heap because it tries to access
allocBits.

This CL fixes this by populating these fields in alloc_m. The next CL
builds on this to only publish the span once it is fully initialized.
Together, they'll make it safe to check allocBits even if there is a
race with alloc_m.

For #10958, #24543, but a good fix in general.

Change-Id: I7fde90023af0f497e826b637efa4d19c32840c08
Reviewed-on: https://go-review.googlesource.com/c/go/+/203285
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2019-10-31 17:09:48 +00:00
.github .github: don't render author-facing text in ISSUE_TEMPLATE 2018-11-02 04:47:34 +00:00
api api/go1.13: add debug/elf.Symbol fields added in CL 184099 2019-08-08 18:44:16 +00:00
doc doc/go1.14: document that Go 1.14 is likely last to support darwin/arm 2019-10-28 16:56:52 +00:00
lib/time lib/time: update tz data to 2019b 2019-07-03 23:08:27 +00:00
misc misc: delete benchcmp forwarding script 2019-10-23 21:41:15 +00:00
src runtime: fully initialize span in alloc_m 2019-10-31 17:09:48 +00:00
test cmd/compile/internal/gc: reword "declared and not used" error message 2019-10-28 23:34:13 +00:00
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AUTHORS A+C: change email address for Akhil Indurti 2019-09-09 15:30:38 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: update email address for utkarsh-extc 2019-10-03 12:39:06 +00:00
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README.md

The Go Programming Language

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