Re: Double fault when single-stepping compat task with PREEMPT_RT

From: Sebastian Andrzej Siewior
Date: Sun Dec 15 2013 - 14:34:00 EST


On 09/25/2013 03:24 PM, Ben Hutchings wrote:
> On Tue, 2013-09-24 at 13:43 -0700, Brian Silverman wrote: [...]
>> I got down to a really simple program that reproduces this bug:
>>
>>
>> #include <sys/syscall.h> #include <unistd.h> int main() { // I've
>> tried SYS_getpid, SYS_write, and SYS_read here too.
>> syscall(SYS_gettid); }

Brian, thank you for this excellent stripped down test case.
I think I know what is going on, will dig more later.

> Ben.
>

Sebastian
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