[Python-Dev] test_subprocess and sparc buildbots (original) (raw)

Alexandre Vassalotti alexandre at peadrop.com
Wed Dec 31 08:50:54 CET 2008

On Tue, Dec 30, 2008 at 10:41 PM, Daniel (ajax) Diniz <ajaksu at gmail.com> wrote:

A reliable way to get that in a --with-pydebug build seems to be:

~/py3k$ ./python -c "import locale; locale.formatstring(1,1)" * ob object : <refcnt 0 at 0x825c76c> type : tuple refcount: 0 address : 0x825c76c * op->obprev->obnext NULL * op->obnext->obprev object : <refcnt 0 at 0x825c76c> type : tuple refcount: 0 address : 0x825c76c Fatal Python error: UNREF invalid object TypeError: expected string or buffer Aborted

Nice catch! I reduced your example to: "import _sre; _sre.compile(0, 0, [])". And, it doesn't seem to be an input validation problem with _sre. From what I saw, it's actually a bug in Py_TRACE_REFS's code. Now, it's getting interesting!

It seems something is breaking the refchain. However, I don't know what is causing the problem exactly.

Found using Fusil in a very quick run on top of: Python 3.1a0 (py3k:68055M, Dec 31 2008, 01:34:52) [GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu3)] on linux2

So kudos to Victor again :)

Could share the details on how you used Fusil to find another crasher? It sounds like a useful tool.

Thanks!

-- Alexandre

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