Re: Corruption Stats: Suggested Blacklist from the data

Linus Torvalds (torvalds@transmeta.com)
Wed, 29 Jul 1998 17:25:18 -0700 (PDT)

On Thu, 30 Jul 1998, MOLNAR Ingo wrote:
>
> there is a difference, back half a year i had some very rare lockups
> occuring when some (buggy) code did a lock_kernel() with IRQs turned off.
> (this might block a pending APIC irq, typically it was the timer
> interrupt, and if another CPU is waiting for jiffies to increase, we were
> cooked.)

Good call. Checking that local interrupts were enabled when trying to get
the kernel lock was _not_ one of the sanity checks I had (I was checking
the sanity of the lock itself, rather than checking the sanity of the
caller).

I'm compiling the kernel with an added test right now - that would
certainly have explained some problems. Trying to get the kernel lock with
interrupts off is a rather bad idea,

Linus

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