Opened at 2023-11-29T23:30:16Z

Last modified at 2024-01-08T15:24:07Z

#4078 new defect

intermittant failures / race-condition on immutable.download.fetcher

Reported by: meejah Owned by:
Priority: normal Milestone: undecided
Component: code-storage Version: n/a
Keywords: Cc:
Launchpad Bug:

Description

While trying to prepare 1.19.0, some builder exhibited an intermittent failure relating to the _shares member of SegmentFetcher not being available.

This can only happen due to some code that *claims* to be "helping the GC" and appears to be a race condition.

Investigate.

Change History (2)

comment:1 Changed at 2024-01-08T15:21:33Z by itamarst

This was supposed to be fixed by ​https://github.com/tahoe-lafs/tahoe-lafs/pull/1348 but it's still happening: 

[ERROR]
Traceback (most recent call last):
  File "/home/itamarst/devel/tahoe-lafs/venv311/lib/python3.11/site-packages/foolscap/eventual.py", line 26, in _turn
    cb(*args, **kwargs)
  File "/home/itamarst/devel/tahoe-lafs/src/allmydata/immutable/downloader/node.py", line 259, in got_shares
    self._active_segment.add_shares(shares)
  File "/home/itamarst/devel/tahoe-lafs/src/allmydata/immutable/downloader/fetcher.py", line 82, in add_shares
    self._shares.extend(shares)
builtins.AttributeError: 'SegmentFetcher' object has no attribute '_shares'

allmydata.test.test_system.HTTPSystemTest.test_upload_and_download_convergent

comment:2 Changed at 2024-01-08T15:22:18Z by itamarst

I can reproduce fairly consistently with trial -u allmydata.test.test_system.HTTPSystemTest.test_upload_and_download_convergent

Version 0, edited at 2024-01-08T15:22:18Z by itamarst (next)
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