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go / go / 6a86dbe75f6d5a135eefbae807d98e856136514f
commit6a86dbe75f6d5a135eefbae807d98e856136514f[log] [tgz]
authorAustin Clements <austin@google.com>Fri May 27 12:21:14 2016 -0400
committerAustin Clements <austin@google.com>Fri May 27 17:53:21 2016 +0000
treeb79ece30bdb26c6be61462cb1dc73a948373efd1
parent966baedfea6b09fa203b0cf0e6388830cc9f9fa7 [diff]
runtime: always call stackfree on the system stack

Currently when the garbage collector frees stacks of dead goroutines
in markrootFreeGStacks, it calls stackfree on a regular user stack.
This is a problem, since stackfree manipulates the stack cache in the
per-P mcache, so if it grows the stack or gets preempted in the middle
of manipulating the stack cache (which are both possible since it's on
a user stack), it can easily corrupt the stack cache.

Fix this by calling markrootFreeGStacks on the system stack, so that
all calls to stackfree happen on the system stack. To prevent this bug
in the future, mark stack functions that manipulate the mcache as
go:systemstack.

Fixes #15853.

Change-Id: Ic0d1c181efb342f134285a152560c3a074f14a3d
Reviewed-on: https://go-review.googlesource.com/23511
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Rick Hudson <rlh@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
2 files changed
tree: b79ece30bdb26c6be61462cb1dc73a948373efd1
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
README.md

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