Hi All As regards issues like #5567 & #4219, Failure object creation is not thread safe. I use deferToThread daily due to many blocking apis still have to be used in my system. I looked into the code and noticed there is a global count used in Failure.__init__. An increment will be made for every __init__ invoke. I consider it is one part can be treated as thread unsafe.
Because I didn't use Failure() besides of logging exec_info and didn't meet any crash issue related to Failure() so I consider it is not a serious problem. I am curious who has experience like system crash or data corruption with Failure. Regards gelin yan
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