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runtime: deeply nested struct initialized with non-zero values [1.16 backport] #46657

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gopherbot opened this issue Jun 9, 2021 · 3 comments
Closed

runtime: deeply nested struct initialized with non-zero values [1.16 backport] #46657

gopherbot opened this issue Jun 9, 2021 · 3 comments
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CherryPickApproved FrozenDueToAge
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Go1.16.6

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@gopherbot gopherbot commented Jun 9, 2021

@thanm requested issue #46653 to be considered for backport to the next 1.16 minor release.

@gopherbot please consider this for backport to 1.15 and 1.16
@gopherbot gopherbot added the CherryPickCandidate label Jun 9, 2021
@gopherbot gopherbot mentioned this issue Jun 9, 2021
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@gopherbot gopherbot added this to the Go1.16.6 milestone Jun 9, 2021
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@gopherbot gopherbot commented Jun 9, 2021

Change https://golang.org/cl/326212 mentions this issue: [release-branch.go1.16] [release-branch.go1.10] cmd/compile: make map.zero symbol content-addressable

@heschi heschi added CherryPickApproved and removed CherryPickCandidate labels Jun 10, 2021
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@heschi heschi commented Jun 10, 2021

Approved.

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@gopherbot gopherbot commented Jun 29, 2021

Closed by merging d4ee025 to release-branch.go1.16.

gopherbot pushed a commit that referenced this issue Jun 29, 2021
@thanm @dmitshur
[release-branch.go1.16] cmd/compile: make map.zero symbol content-add…
d4ee025 
…ressable

The compiler machinery that generates "map.zero" symbols marks them as
RODATA and DUPOK, which is problematic when a given application has
multiple map zero symbols (from different packages) with varying
sizes: the dupok path in the loader assumes that if two symbols have
the same name, it is safe to pick any of the versions. In the case of
map.zero, the link needs to select the largest symbol, not an
arbitrary sym.

To fix this problem, mark map.zero symbols as content-addressable,
since the loader's content addressability processing path already
supports selection of the larger symbol in cases where there are dups.

Fixes #46657.

Change-Id: Iabd2feef01d448670ba795c7eaddc48c191ea276
Reviewed-on: https://go-review.googlesource.com/c/go/+/326211
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit aa5540c)
Reviewed-on: https://go-review.googlesource.com/c/go/+/326212
Run-TryBot: Cherry Mui <cherryyz@google.com>
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