Memory corruptions related to AST patch

10 years ago by Dmitry Stogov — view source

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Hi Nikita,

On weekend I ran PHP test suite with valgrind and opcache.
I noticed few new tests failures, that most probably introduced by AST
patch.

Bug #21820 ("$arr['foo']" generates bogus E_NOTICE, should be E_PARSE)
[tests/lang/bug21820.phpt]
Bug #66286: Incorrect object comparison with inheritance
[Zend/tests/bug66286.phpt]
unbraced complex variable replacement test (heredoc)
[Zend/tests/heredoc_005.phpt]
isset() can be used on dereferences of temporary expressions
[Zend/tests/varSyntax/issetOnTemp.phpt]

I suppose they indicate two different problems.
One of them indicates that some zvals became a subject for GC, however they
won't before. This may be fixed in opcache, but it's better to understand
what was changed.

Please take a look.

Thanks. Dmitry.

10 years ago by Nikita Popov — view source

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Hi Nikita,

On weekend I ran PHP test suite with valgrind and opcache.
I noticed few new tests failures, that most probably introduced by AST
patch.

Bug #21820 ("$arr['foo']" generates bogus E_NOTICE, should be E_PARSE)
[tests/lang/bug21820.phpt]
Bug #66286: Incorrect object comparison with inheritance
[Zend/tests/bug66286.phpt]
unbraced complex variable replacement test (heredoc)
[Zend/tests/heredoc_005.phpt]
isset() can be used on dereferences of temporary expressions
[Zend/tests/varSyntax/issetOnTemp.phpt]

I suppose they indicate two different problems.
One of them indicates that some zvals became a subject for GC, however
they won't before. This may be fixed in opcache, but it's better to
understand what was changed.

Please take a look.

Thanks. Dmitry.

For the record, these have been resolved by
https://github.com/php/php-src/commit/af84d5737c47c3ec3959e056f171b14ab76fb7b8
and
https://github.com/php/php-src/commit/c59300ac86dd02bcdacd6c1460a5b43e91a5bf49
.

Nikita