| commit | 9940c7768261f035b14657053ada8d0e88283241 | [log] [tgz] |
|---|---|---|
| author | Dan Scales <danscales@google.com> | Tue Nov 19 12:41:51 2019 -0800 |
| committer | Dan Scales <danscales@google.com> | Mon Nov 25 03:41:16 2019 +0000 |
| tree | ae5dcc4fc4ea6cdf495f24755336fe1e6cdae945 | |
| parent | b81dd1c0e722a7d048ffe935d3f2062d2fae4e86 [diff] |
runtime: add go:nosplit to cgo_mmap.go:mmap() and sys_darwin.go:mmap()
cgo_mmap.go:mmap() is called by mem_linux.go:sysAlloc(), a low-level memory
allocation function. mmap() should be nosplit, since it is called in a lot of
low-level parts of the runtime and callers often assume it won't acquire any
locks.
As an example there is a potential deadlock involving two threads if mmap is not nosplit:
trace.bufLock acquired, then stackpool[order].item.mu, then mheap_.lock
- can happen for traceEvents that are not invoked on the system stack and cause
a traceFlush, which causes a sysAlloc, which calls mmap(), which may cause a
stack split. mheap_.lock
mheap_.lock acquired, then trace.bufLock
- can happen when doing a trace in reclaimChunk (which holds the mheap_ lock)
Also, sysAlloc() has a comment that it is nosplit because it may be invoked
without a valid G, in which case its callee mmap() should also be nosplit.
Similarly, sys_darwin.go:mmap() is called by mem_darwin.go:sysAlloc(), and should
be nosplit for the same reasons.
Extra gomote testing: linux/arm64, darwin/amd64
Change-Id: Ia4d10cec5cf1e186a0fe5aab2858c6e0e5b80fdc
Reviewed-on: https://go-review.googlesource.com/c/go/+/207844
Reviewed-by: Ian Lance Taylor <iant@golang.org>
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