[pve-devel] [PATCH ceph master v1] pybind/rbd: disable on_progress callbacks to prevent MGR segfaults

[Max R. Carrara]

On Wed Sep 10, 2025 at 9:00 AM CEST, Fabian Grünbichler wrote:
> On September 9, 2025 7:05 pm, Max R. Carrara wrote:
> > Currently, *all* MGRs collectively segfault on Ceph v19.2.3 running on
> > Debian Trixie if a client requests the removal of an RBD image from
> > the RBD trash (#6635 [0]).
> > 
> > After a lot of investigation, the cause of this still isn't clear to
> > me; the most likely culprit are some internal changes to Python
> > sub-interpreters that happened between Python versions 3.12 and 3.13.
> > 
> > What leads me to this conclusion is the following:
> >  1. A user on our forum noted [0] that the issue disappeared as soon as
> >     they set up a Ceph MGR inside a Debian Bookworm VM. Bookworm has
> >     Python version 3.11, before any substantial changes to
> >     sub-interpreters [1][2] were made.
>
> did you try with stock Debian Trixie packages (the Ceph version is still
> 18.2 there, which might help narrowing it down)?

Not yet, but I'm going to eventually. Will just take a while to set
everything up.

>
> in any case, it would be good to bring this issue to upstream's
> attention as well!

Already done ;)

https://tracker.ceph.com/issues/72713

>  
> >  2. There is an upstream issue [3] regarding another segfault during
> >     MGR startup. The author concluded that this problem is related to
> >     sub-interpreters and opened another issue [4] on Python's issue
> >     tracker that goes into more detail.
> > 
> >     Even though this is for a completely different code path, it shows
> >     that issues related to sub-interpreters are popping up elsewhere
> >     at the very least.
>
> did you try reproducing that one? it seems it requires an optional
> ceph-mgr plugin that we have packaged as well, so should be fairly
> straight-forward..

Not yet, since the root cause of the bug was already found, it seems:
https://github.com/python/cpython/issues/138045

>
>
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