Tom Lane 478af9b797 Don't let timeout interrupts happen unless ImmediateInterruptOK is set. ...

Serious oversight in commit 16e1b7a1b7:
we should not allow an interrupt to take control away from mainline code
except when ImmediateInterruptOK is set.  Just to be safe, let's adopt
the same save-clear-restore dance that's been used for many years in
HandleCatchupInterrupt and HandleNotifyInterrupt, so that nothing bad
happens if a timeout handler invokes code that tests or even manipulates
ImmediateInterruptOK.

Per report of "stuck spinlock" failures from Christophe Pettus, though
many other symptoms are possible.  Diagnosis by Andres Freund.

2013-12-13 11:50:25 -05:00

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