#30952: KeyError: '_password_reset_token' during password reset.
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Reporter: defigor | Owner: nobody
Type: Bug | Status: closed
Component: contrib.auth | Version: 2.1
Severity: Normal | Resolution: needsinfo
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by Mark Gregson):
I'm occasionally seeing this same behaviour in 2.2.12. Unfortunately I
haven't worked out how to reproduce it either however I spent some time
testing and analysing the code to understand how it might happen. I
haven't identified the cause but I think I have ruled out a race-
condition.
A race-condition did indeed seem likely at first simply because there is
no other obvious cause however I think it's not possible: the session is
loaded (from the DB in my case) by the session middleware before the view
function is called and _password_reset_token must be in the session at
dispatch() in order to proceed to form_valid(). A second process
modifying the stored session will not affect the first's in-memory copy of
the session while the first is between dispatch() and form_valid(), hence
no race-condition. I'm not familiar with the session code so maybe there
is some way for the session to be reloaded that would enable a race-
condition.
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Ticket URL: <https://code.djangoproject.com/ticket/30952#comment:2>
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