This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author graingert
Recipients ZackerySpytz, graingert, matrixise, serhiy.storchaka, vstinner
Date 2019-05-09.22:59:57
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
In-reply-to <>
The point for me is that CI will fail if it happens, then I can use gdb to
find out the cause

On Thu, 9 May 2019, 23:17 STINNER Victor, <> wrote:

> STINNER Victor <> added the comment:
> Ok, let me come back to the initial issue:
> Thomas Grainger:
> > Currently it's quite easy for these errors to go unnoticed. I'd like a
> way to easily detect these in CI. nedbat suggested piping the process
> output to another tool, and looking for 'Exception ignored in:' but this
> seems a little diff
> When PyErr_WriteUnraisable() is called before Python finalization, my PR
> 13187 allows to handle these exceptions: log them in a dedicated file,
> abort the process, maybe even open a network connection, etc. The hook
> allows to implement your chosen behavior.
> The problem is more during Python finalization: see attached
> example and my previous comment. If
> PyErr_WriteUnraisable() is called after sys.stderr is closed or closed to
> None, the function does nothing: the exception is not logged.
> The question now becomes: do *all* calls to PyErr_WriteUnraisable() must
> abort the process? What is the point? Only a very low level debugger like
> gdb can be used to see the exception.
> @Thomas Grainger: Do you want to have to use gdb to trace such very level
> exception?
> IMHO sadly when PyErr_WriteUnraisable() is called way too late, we should
> simply ignore such exceptions. And so my PR 13187 is good enough to cover
> most cases.
> If someone cares about exceptions raised very late during Python
> finalization, Python finalization should be enhanced. But this code is very
> fragile and is not deterministic. It is a work in progress for years to
> enhance it.
> ----------
> _______________________________________
> Python tracker <>
> <>
> _______________________________________
Date User Action Args
2019-05-09 22:59:58graingertsetrecipients: + graingert, vstinner, serhiy.storchaka, matrixise, ZackerySpytz
2019-05-09 22:59:58graingertlinkissue36829 messages
2019-05-09 22:59:57graingertcreate