On 22 Aug, Salam Farhat wrote: > On Fri, Aug 21, 2015 at 8:33 AM, <Valdis.Kletnieks@xxxxxx> wrote: > > > On Fri, 21 Aug 2015 07:06:58 -0400, Salam Farhat said: > > > > > I am using a kernel module that I modified slightly to work on my current > > > kernel version. It is running on a virtual machine and on a heavy load it > > > goes into an infinite loop and freezes the system. I can tell that the > > > virtual machine is using 100% of its assigned cpu. > > > > Try giving the VM a second virtual CPU, if you have only one CPU and it > > gets hung sufficiently hard, the debugging stuff won't have a chance to > > run. > > > > Oh, and make sure you configure your kernel for SMP. > > > > It has 4 cores and kernel is already configured for smp. > > Sysrq is a pretty cool option, but other than reboot almost no other > commands run including 'e', 'f', ;i;. > > It seems I might have to resort to debugging by the process of elimination > (removing code until it doesn't hang and so on.. ). > > Any other ideas I would appreciate it. If you use qemu-kvm to run your VM, you could try to use gdb to debug your kernel running inside of VM. man qemu: -s Shorthand for -gdb tcp::1234, i.e. open a gdbserver on TCP port 1234. -- Best regards, Andrey Skvortsov Secure eMail with gnupg: See http://www.gnupg.org/ PGP Key ID: 0x57A3AEAD
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