Hi Peter, On Tue, Jun 08, 2021 at 01:58:47PM +0200, Peter Zijlstra wrote: > So #VC cannot happen with IRQs disabled? > > raw_spin_lock_irq(&my_lock); > <#VC> > raw_spin_lock_irqsave(&my_lock); // whoopsie > > Every exception that can happen with IRQs disabled must be NMI like. > > Again, what you seem to want is to split the handler in a from-user and > from-kernel way, just like we did with #DB and MCE. See how > exc_debug_user() is IRQ-like and can send signals, while > exc_debug_kernel() is NMI like and can not. You are right, thanks for pointing this out. I replaced that patch by one implementing the split in a from-user and from-kernel part. Initial testing looks good, will send it out later this week. Thanks, Joerg
