PHPDBG ASAN failures under tracked alloc without zend alloc
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Description
Description
The following tests fail with USE_TRACKED_ALLOC=1 and USE_ZEND_ALLOC=0 under ASAN:
Bug #73927 (phpdbg fails with windows error prompt at "watch array") [sapi/phpdbg/tests/bug73927.phpt]
Test simple recursive watchpoint [sapi/phpdbg/tests/watch_001.phpt]
Test simple array watchpoint with replace [sapi/phpdbg/tests/watch_002.phpt]
Test simple watchpoint with replace [sapi/phpdbg/tests/watch_003.phpt]
Test detection of inline string manipulations on zval watch [sapi/phpdbg/tests/watch_004.phpt]
Test proper watch comparisons when having multiple levels of indirection from a zval to its value [sapi/phpdbg/tests/watch_005.phpt]
Test multiple watch elements pointing to the same watchpoint [sapi/phpdbg/tests/watch_006.phpt]
Some fail with:
Zend/zend_alloc.c:2806: tracked_get_size_zv: Assertion size_zv && "Trying to free pointer not allocated through ZendMM"' failed.`
and some fail with a use-after-free message
PHP Version
current master, stable versions not tested
Operating System
Linux 6.2.10
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the failures with USE_TRACKED_ALLOC=1 and USE_ZEND_ALLOC=0 under ASAN, starting with the listed sapi/phpdbg/tests/*.phpt cases. Read Zend/zend_alloc.c around the tracked_get_size_zv assertion and compare the assertion failures with the reported use-after-free messages. Done means all listed phpdbg watchpoint tests pass under this configuration.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- c
- Domain
- devtools, testing-qa
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100