Control: reassign -1 python3-eventlet Control: affects -1 matrix-synapse python3-sentry-sdk Control: found -1 0.40.4-1
On Fri, 2026-06-19 at 21:31 +0200, First name Last name wrote: > On 13.06.26 4:07 AM, Christopher Obbard wrote: > > Hello, > > > > On Fri, 20 Feb 2026 17:45:49 +0100 Gena Byers <[email protected]> > > wrote: > > > On 2/20/26 5:22 PM, Andrej Shadura wrote: > > > > Control: reassign -1 src:sentry-python > > > > > > > > Hello, > > > > > > > > On Fri, 20 Feb 2026, at 17:15, Gena Byers wrote: > > > > > On 2/20/26 4:54 PM, Andrej Shadura wrote: > > > > > > Can you give me more details please? > > > > > > I don’t see any mentions of this anywhere in the source. > > > > > > > > > I don't know what the exact mechanism is but installing > > > > > python3-eventlet > > > > > renders matrix-synapse inoperable: > > > > > > > > > "/usr/lib/python3/dist-packages/sentry_sdk/utils.py", line 1346, in > > > > > _get_contextvars > > > > > Feb 20 16:59:17 nexus python3[2979902]: if not > > > > > _is_contextvars_broken(): > > > > > Feb 20 16:59:17 nexus python3[2979902]: > > > > > ~~~~~~~~~~~~~~~~~~~~~~^^ > > > > > Feb 20 16:59:17 nexus python3[2979902]: File > > > > > "/usr/lib/python3/dist-packages/sentry_sdk/utils.py", line 1287, in > > > > > _is_contextvars_broken > > > > > Feb 20 16:59:17 nexus python3[2979902]: from eventlet.patcher > > > > > import > > > > > is_monkey_patched # type: ignore > > > > > > > > Looks like something in the sentry SDK (which I think you should have > > > > mentioned you enabled). > > > > > > > I do have python3-sentry-sdk installed because it's a dependency of an > > > unrelated package but I have no idea what that is or what I did to > > > "enable" it. Removing python3-sentry-sdk makes matrix-synapse work again > > > even with python3-eventlet installed so I guess both have to be > > > installed to trigger it. > > > > I recently uploaded some new versions of sentry-python, can you please test > > this bug again? > > > > For reference, I tested this bug very quickly here and couldn't reproduce > > it. > > > > Sentry is only used in matrix-synapse if it is enabled in the config. > > Otherwise, it is not imported > > at all: > > https://github.com/element-hq/synapse/blob/d7e9a3ff8321fa820f38c17a4484f0437233cebb/synapse/app/_base.py#L830 > > > > To "enable" sentry in matrix-synapse you need to have something like this > > in your > > config (/etc/matrix-synapse/homeserver.yaml): > > > > sentry: > > environment: production > > dsn: '...' > > > > > > AFAICT, the default configuration in Debian does NOT set the sentry > > configuration, > > so by default really you shouldn't be hitting this path. > > > > Can you check if you setup sentry at all in the synapse configuration? > > I guess we should add python3-sentry-sdk as a runtime-dep to matrix-synapse > > as well, since it can be enabled at runtime. > > > > > > Cheers! > > > > Chris > > I don't have something like that in my configuration. Having both > python3-sentry-sdk (2.60.0-3) and python3-eventlet (0.40.4-1) installed > still renders matrix-synapse inoperable: Thanks for the traceback - I can now reproduce this after installing python3-trio. A minimal reproducer appears to be: apt install python3-sentry-sdk python3-eventlet python3-trio python3-dnspython python3-httpcore python3 -c 'import sentry_sdk' which fails with: AttributeError: type object 'GreenSocket' has no attribute 'sendmsg' The Synapse failure does not require Sentry to be configured. Synapse imports sentry_sdk during startup which causes the traceback. Setting EVENTLET_NO_GREENDNS=yes avoids the crash: EVENTLET_NO_GREENDNS=yes python3 -c 'import sentry_sdk' I get the same crash when just importing eventlet: python3 -c 'import eventlet' AttributeError: type object 'GreenSocket' has no attribute 'sendmsg' This looks very similar to #1042466 but #1042466 the missing method is eventlet.green.select.epoll. Here the missing method is eventlet.green.socket.GreenSocket.sendmsg so I won't merge the bugs yet. Reassigning to python3-eventlet. @Thomas, could you take a look at this one? Cheers! Chris
