Re: How to debug system freeze (not detected by kernel debug options)

2012-11-09 Thread Alan Cox
On Fri, 09 Nov 2012 02:19:33 + (GMT) Jongman Heo wrote: > > Dear kernel hackers, > > I have a problem in SMP environment, in x86 platform (Intel Atom based > embedded system) > > In UP, there is no issue, but in SMP, system freezed in tens of minutes (or > shorter), if I perform IO test

How to debug system freeze (not detected by kernel debug options)

2012-11-08 Thread Jongman Heo
Dear kernel hackers, I have a problem in SMP environment, in x86 platform (Intel Atom based embedded system) In UP, there is no issue, but in SMP, system freezed in tens of minutes (or shorter), if I perform IO test with flash memory and HDD simultaneously (using dd). I enabled relevant kern