Re: 2.6.7-rc1-bk: SMT scheduler bug / crashes on kernel boot

[Nick Piggin <nickpiggin@yahoo.com.au>]

Anton Altaparmakov wrote:
> Hi,
> 
> Kernel 2.6.7-rc1-bk crashes on boot with a NULL pointer dereference. 
> The kernel is running under VMware if that matters but I don't think it
> should.  It was working fine with 2.6.6-rc3-bk kernels.
> 
> I am afraid the only way I could capture the crash was to capture the
> vmware screen into a PNG image which is attached.  Maybe I need to setup
> some OCR software for in the future...  (-;
> 
> The system running VMware is a P4 2.6Hz with Hyper threading enabled and
> /proc/cpuinfo shows two cpus:

OK, thanks for that. It would be quite helpful if you edit
kernel/sched.c and turn the line #undef SCHED_DOMAIN_DEBUG into
#define SCHED_DOMAIN_DEBUG, then compile a kernel with debugging
info enabled.

Boot again, and capture another screenshot of the oops. This will
hopefully include the SCHED_DOMAIN_DEBUG output.

Also run
	
	addr2line -e /path/to/vmlinux EIP

vmlinux is the file generated in the root directory of the source
tree after compilation. EIP is the EIP value printed by the Oops.

Thanks.