Re: Softlockup and Hardlockup sample test module
On Sun, Apr 15, 2018 at 12:47 AM, Ivid Suvarna wrote: > Hi All, > > Could you please provide some sample test module for causing a > Softlockup and Hardlockup in latest kernel for SMP for testing > purposes. I assume there are some Kconfigs to be enabled as well for > this. https://github.com/torvalds/linux/blob/master/drivers/misc/lkdtm/bugs.c#L130 Is this what you need?
Re: Softlockup and Hardlockup sample test module
On Sun, 15 Apr 2018 13:17:27 +0530, Ivid Suvarna said: > I had tried with the module where I put a busy loop inside spinlock > but was not able to cause any lockups. Maybe this is because of SMP > which schedule the job to other CPU. "How do I make a task to run on > single CPU only?" So you get a kernel thread that's taken a lock and will busy-loop and not free it. What sort of lockup do you expect will be detected from this? Would the results be any different if you didn't take a lock before busy-looping? For bonus points - what additional things have to happen before a livelock happens? And before a deadlock happens? pgp5UHAJhB8G4.pgp Description: PGP signature
