The least two bits of the owner field of a Page are used to determine
whether the Page is part of a large object. If these bits are not equal
to 0x11, the page is part of a large object and needs special handling
e.g. in MemoryChunk::FromAnyPointerAddress to determine which chunk it
belongs to.
This CL fixes an issue in which the store buffer overflows after
a large object space allocation but before the object has been fully
initialized. Store buffer overflow handling attempts to look up the
chunk of a page, but fails to do so correctly since the page's owner
field has not yet been initialized.
This CL ensures that the owner field of all pages belonging to a large
object allocation are initialized to a value that is interpreted
correctly.
BUG=chromium:672041
Committed: https://crrev.com/9b6808bfb5366beebe3af30a06f9851edb2039d4
Review-Url: https://codereview.chromium.org/2565713002
Cr-Original-Commit-Position: refs/heads/master@{#41641}
Cr-Commit-Position: refs/heads/master@{#41687}
Reason for revert:
Tree closer: https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/12409
Original issue's description:
> [heap] Initialize the owner on each page after lospace allocation
>
> The least two bits of the owner field of a Page are used to determine
> whether the Page is part of a large object. If these bits are not equal
> to 0x11, the page is part of a large object and needs special handling
> e.g. in MemoryChunk::FromAnyPointerAddress to determine which chunk it
> belongs to.
>
> This CL fixes an issue in which the store buffer overflows after
> a large object space allocation but before the object has been fully
> initialized. Store buffer overflow handling attempts to look up the
> chunk of a page, but fails to do so correctly since the page's owner
> field has not yet been initialized.
>
> This CL ensures that the owner field of all pages belonging to a large
> object allocation are initialized to a value that is interpreted
> correctly.
>
> BUG=chromium:672041
>
> Committed: https://crrev.com/9b6808bfb5366beebe3af30a06f9851edb2039d4
> Cr-Commit-Position: refs/heads/master@{#41641}
TBR=mlippautz@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:672041
Review-Url: https://codereview.chromium.org/2562273004
Cr-Commit-Position: refs/heads/master@{#41644}
The least two bits of the owner field of a Page are used to determine
whether the Page is part of a large object. If these bits are not equal
to 0x11, the page is part of a large object and needs special handling
e.g. in MemoryChunk::FromAnyPointerAddress to determine which chunk it
belongs to.
This CL fixes an issue in which the store buffer overflows after
a large object space allocation but before the object has been fully
initialized. Store buffer overflow handling attempts to look up the
chunk of a page, but fails to do so correctly since the page's owner
field has not yet been initialized.
This CL ensures that the owner field of all pages belonging to a large
object allocation are initialized to a value that is interpreted
correctly.
BUG=chromium:672041
Review-Url: https://codereview.chromium.org/2565713002
Cr-Commit-Position: refs/heads/master@{#41641}
