[PATCH v8] kernel, add panic_on_warn
prarit at redhat.com
Sat Nov 8 05:29:21 PST 2014
On 11/07/2014 04:09 PM, David Rientjes wrote:
> On Fri, 7 Nov 2014, Prarit Bhargava wrote:
>> There very much is. Consider a thread that hits a WARN() and then panics. Then
>> somewhere in the panic code the thread hits another WARN() ... and then panics
>> again. Previously this would have caused the system to "finish" panick'ing.
>> Now it makes the system hang.
> Then we're back to square one which is what is obviously the intent of
> your patch and the comment that goes along with it:
My original reply pointed out that the comment was wrong.
we want to clear
> panic_on_warn once and not allow multiple panic().
On _this_ thread. The multiple panic across threads cannot occur.
So why not just add
> the necessary synchronization to make sure that happens when WARN()
> happens on two cpus simultaneously?
More information about the kexec