@mcb30 ,
The root cause is in static unsigned long efi_currticks ( void );
Then please print the original TPL in this function.
Because this TPL is always raised to TPL_CALLBACK, then when
gEfiEventExitBootServicesGuid is triggerred, some notify function which are
registerred at TPL_CALLBACK cannot be executed.
You can register such kind of callback at TPL_CALLBACK, and check whether it
can be executed when gEfiEventExitBootServicesGuid is signnalled.
@huanghe4
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