http2,tls: store WriteWrap using BaseObjectPtr #35488
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Create weak `WriteWrap` and `ShutdownWrap` objects, and when referencing them in C++ is necessary, use `BaseObjectPtr<>` instead of plain pointers to keep these objects from being garbage-collected. This solves issues that arise when the underlying `StreamBase` instance is weak, but the `WriteWrap` or `ShutdownWrap` instances are not; in that case, they would otherwise potentially stick around in memory after the stream that they originally belong to is long gone. It probably makes sense to use `BaseObjectptr<>` more extensively in `StreamBase` in the long run as well.
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When a process exits cleanly, i.e. because the event loop ends up
without things to wait for, the Node.js objects that are left on
the heap should be:
1. weak, i.e. ready for garbage collection once no longer
referenced, or
2. detached, i.e. scheduled for destruction once no longer
referenced, or
3. an unrefed libuv handle, i.e. does not keep the event loop
alive, or
4. an inactive libuv handle (essentially the same here)
There are a few exceptions to this rule, but generally,
if there are C++-backed Node.js objects on the heap
that do not fall into the above categories, we may be looking
at a potential memory leak. Most likely, the cause is a missing
`MakeWeak()` call on the corresponding object.
In order to avoid this kind of problem, we check the list
of BaseObjects for these criteria. In this commit, we only do so
when explicitly instructed to or when in debug mode
(where --verify-base-objects is always-on).
In particular, this avoids the kinds of memory leak issues
that were fixed in the PRs referenced below.
Refs: nodejs#35488
Refs: nodejs#35487
Refs: nodejs#35481
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addaleax
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Oct 6, 2020
Create weak `WriteWrap` and `ShutdownWrap` objects, and when referencing them in C++ is necessary, use `BaseObjectPtr<>` instead of plain pointers to keep these objects from being garbage-collected. This solves issues that arise when the underlying `StreamBase` instance is weak, but the `WriteWrap` or `ShutdownWrap` instances are not; in that case, they would otherwise potentially stick around in memory after the stream that they originally belong to is long gone. It probably makes sense to use `BaseObjectptr<>` more extensively in `StreamBase` in the long run as well. PR-URL: #35488 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
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Oct 6, 2020
Create weak `WriteWrap` and `ShutdownWrap` objects, and when referencing them in C++ is necessary, use `BaseObjectPtr<>` instead of plain pointers to keep these objects from being garbage-collected. This solves issues that arise when the underlying `StreamBase` instance is weak, but the `WriteWrap` or `ShutdownWrap` instances are not; in that case, they would otherwise potentially stick around in memory after the stream that they originally belong to is long gone. It probably makes sense to use `BaseObjectptr<>` more extensively in `StreamBase` in the long run as well. PR-URL: #35488 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
addaleax
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Oct 7, 2020
When a process exits cleanly, i.e. because the event loop ends up
without things to wait for, the Node.js objects that are left on
the heap should be:
1. weak, i.e. ready for garbage collection once no longer
referenced, or
2. detached, i.e. scheduled for destruction once no longer
referenced, or
3. an unrefed libuv handle, i.e. does not keep the event loop
alive, or
4. an inactive libuv handle (essentially the same here)
There are a few exceptions to this rule, but generally,
if there are C++-backed Node.js objects on the heap
that do not fall into the above categories, we may be looking
at a potential memory leak. Most likely, the cause is a missing
`MakeWeak()` call on the corresponding object.
In order to avoid this kind of problem, we check the list
of BaseObjects for these criteria. In this commit, we only do so
when explicitly instructed to or when in debug mode
(where --verify-base-objects is always-on).
In particular, this avoids the kinds of memory leak issues
that were fixed in the PRs referenced below.
Refs: #35488
Refs: #35487
Refs: #35481
PR-URL: #35490
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Contributor
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This doesn't land cleanly on 12.x. As 12.x is about to move to maintenance I'm unsure if it makes sense to backport. We could still potentially get this in the 12.20.0 release if it is backported in a timely fashion, but it isn't clear that this is high priority. |
joesepi
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Jan 8, 2021
Create weak `WriteWrap` and `ShutdownWrap` objects, and when referencing them in C++ is necessary, use `BaseObjectPtr<>` instead of plain pointers to keep these objects from being garbage-collected. This solves issues that arise when the underlying `StreamBase` instance is weak, but the `WriteWrap` or `ShutdownWrap` instances are not; in that case, they would otherwise potentially stick around in memory after the stream that they originally belong to is long gone. It probably makes sense to use `BaseObjectptr<>` more extensively in `StreamBase` in the long run as well. PR-URL: nodejs#35488 Reviewed-By: James M Snell <[email protected]> Reviewed-By: Matteo Collina <[email protected]>
joesepi
pushed a commit
to joesepi/node
that referenced
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Jan 8, 2021
When a process exits cleanly, i.e. because the event loop ends up
without things to wait for, the Node.js objects that are left on
the heap should be:
1. weak, i.e. ready for garbage collection once no longer
referenced, or
2. detached, i.e. scheduled for destruction once no longer
referenced, or
3. an unrefed libuv handle, i.e. does not keep the event loop
alive, or
4. an inactive libuv handle (essentially the same here)
There are a few exceptions to this rule, but generally,
if there are C++-backed Node.js objects on the heap
that do not fall into the above categories, we may be looking
at a potential memory leak. Most likely, the cause is a missing
`MakeWeak()` call on the corresponding object.
In order to avoid this kind of problem, we check the list
of BaseObjects for these criteria. In this commit, we only do so
when explicitly instructed to or when in debug mode
(where --verify-base-objects is always-on).
In particular, this avoids the kinds of memory leak issues
that were fixed in the PRs referenced below.
Refs: nodejs#35488
Refs: nodejs#35487
Refs: nodejs#35481
PR-URL: nodejs#35490
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
addaleax
added a commit
to addaleax/node
that referenced
this pull request
May 23, 2021
When a process exits cleanly, i.e. because the event loop ends up
without things to wait for, the Node.js objects that are left on
the heap should be:
1. weak, i.e. ready for garbage collection once no longer
referenced, or
2. detached, i.e. scheduled for destruction once no longer
referenced, or
3. an unrefed libuv handle, i.e. does not keep the event loop
alive, or
4. an inactive libuv handle (essentially the same here)
There are a few exceptions to this rule, but generally,
if there are C++-backed Node.js objects on the heap
that do not fall into the above categories, we may be looking
at a potential memory leak. Most likely, the cause is a missing
`MakeWeak()` call on the corresponding object.
In order to avoid this kind of problem, we check the list
of BaseObjects for these criteria. In this commit, we only do so
when explicitly instructed to or when in debug mode
(where --verify-base-objects is always-on).
In particular, this avoids the kinds of memory leak issues
that were fixed in the PRs referenced below.
Refs: nodejs#35488
Refs: nodejs#35487
Refs: nodejs#35481
PR-URL: nodejs#35490
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
targos
pushed a commit
that referenced
this pull request
May 25, 2021
When a process exits cleanly, i.e. because the event loop ends up
without things to wait for, the Node.js objects that are left on
the heap should be:
1. weak, i.e. ready for garbage collection once no longer
referenced, or
2. detached, i.e. scheduled for destruction once no longer
referenced, or
3. an unrefed libuv handle, i.e. does not keep the event loop
alive, or
4. an inactive libuv handle (essentially the same here)
There are a few exceptions to this rule, but generally,
if there are C++-backed Node.js objects on the heap
that do not fall into the above categories, we may be looking
at a potential memory leak. Most likely, the cause is a missing
`MakeWeak()` call on the corresponding object.
In order to avoid this kind of problem, we check the list
of BaseObjects for these criteria. In this commit, we only do so
when explicitly instructed to or when in debug mode
(where --verify-base-objects is always-on).
In particular, this avoids the kinds of memory leak issues
that were fixed in the PRs referenced below.
Refs: #35488
Refs: #35487
Refs: #35481
PR-URL: #35490
Backport-PR-URL: #38786
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
targos
pushed a commit
that referenced
this pull request
Jun 11, 2021
When a process exits cleanly, i.e. because the event loop ends up
without things to wait for, the Node.js objects that are left on
the heap should be:
1. weak, i.e. ready for garbage collection once no longer
referenced, or
2. detached, i.e. scheduled for destruction once no longer
referenced, or
3. an unrefed libuv handle, i.e. does not keep the event loop
alive, or
4. an inactive libuv handle (essentially the same here)
There are a few exceptions to this rule, but generally,
if there are C++-backed Node.js objects on the heap
that do not fall into the above categories, we may be looking
at a potential memory leak. Most likely, the cause is a missing
`MakeWeak()` call on the corresponding object.
In order to avoid this kind of problem, we check the list
of BaseObjects for these criteria. In this commit, we only do so
when explicitly instructed to or when in debug mode
(where --verify-base-objects is always-on).
In particular, this avoids the kinds of memory leak issues
that were fixed in the PRs referenced below.
Refs: #35488
Refs: #35487
Refs: #35481
PR-URL: #35490
Backport-PR-URL: #38786
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
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Create weak
WriteWrapandShutdownWrapobjects, and whenreferencing them in C++ is necessary, use
BaseObjectPtr<>instead of plain pointers to keep these objects from being
garbage-collected.
This solves issues that arise when the underlying
StreamBaseinstance is weak, but the
WriteWraporShutdownWrapinstancesare not; in that case, they would otherwise potentially stick
around in memory after the stream that they originally belong
to is long gone.
It probably makes sense to use
BaseObjectptr<>more extensivelyin
StreamBasein the long run as well.Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes