On Wed, 2010-07-07 at 19:41 +0530, gowrishankar wrote: > On Wednesday 07 July 2010 10:16 AM, Mike Galbraith wrote: > > Greetings, > > > > Stress testing, looking to trigger RCU stalls, I've managed to find a > > way to repeatably create fireworks. (got RCU stall, see attached) > > > > 1. download ltp-full-20100630. Needs to be this version because of > > testcase bustage in earlier versions, and must be built with gcc> 4.3, > > else testcases will segfault due to a gcc bug. > > > > > Hi Mike, > I have seen this segfault esp with GCC v4.3.4. I am about to post this > patch > in ltp: > > Signed-off-by: Gowrishankar <gowrishankar.m@xxxxxxxxxx> > --- > testcases/realtime/include/librttest.h | 6 +++--- > 1 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/testcases/realtime/include/librttest.h > b/testcases/realtime/include/librttest.h > index e526ab4..273de6f 100644 > --- a/testcases/realtime/include/librttest.h > +++ b/testcases/realtime/include/librttest.h > @@ -118,9 +118,9 @@ static inline int atomic_add(int i, atomic_t *v) > int __i; > __i = i; > asm volatile( > - "lock; xaddl %0, %1;" > - :"=r"(i) > - :"m"(v->counter), "0"(i)); > + "lock; xaddl %1, %0;" > + :"=m"(v->counter) > + :"r"(i), "m" (v->counter)); > return i + __i; > #elif defined(__powerpc__) > #define ISYNC_ON_SMP "\n\tisync\n" > -- > > Please let me know if this patch helps. Yup, all better. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
