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We thought things were fixed with [1] but it turns out that swiftclient 
logs requests and responses at DEBUG level, so we're still switching 
thread context during a backup write and failing the backup operation, 
causing copious amounts of pain in the gate and piling up the rechecks.

I've got a workaround here [2] which will hopefully be good enough to 
stabilize things for awhile, but there is probably not much point in 
rechecking a lot of patches, at least ones that run through the 
integrated gate, until that is merged.

[1] https://review.openstack.org/#/c/537437/
[2] https://review.openstack.org/#/c/538027/

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Thanks,

Matt