panic in ivy_rng_store() when compiled with -O0

[Navdeep Parhar]

On Fri, Oct 17, 2014 at 11:53:58AM -0400, John Baldwin wrote:
> On Friday, October 10, 2014 02:08:13 PM Navdeep Parhar wrote:
> > I built my kernel + modules (head as of today) with -O0 and now it
> > panics during boot.  I did bump up KSTACK_PAGES significantly so that's
> > not the problem.  I'm going to take out the RNG device next and see if I
> > can get past this.
> > 
> > Regards,
> > Navdeep
> > 
> > Fatal trap 9: general protection fault while in kernel mode
> > cpuid = 0; apic id = 00
> > instruction pointer	= 0x20:0xffffffff814ac661
> > stack pointer	        = 0x28:0xfffffe01ed6c6930
> > frame pointer	        = 0x28:0xfffffe01ed6c6960
> > code segment		= base 0x0, limit 0xfffff, type 0x1b
> > 			= DPL 0, pres 1, long 1, def32 0, gran 1
> > processor eflags	= interrupt enabled, resume, IOPL = 0
> > current process		= 14 (rand_harvestq)
> > [ thread pid 14 tid 100017 ]
> > Stopped at      ivy_rng_store+0x31:     movq    %rdi,(%rdi)
> > db> bt
> > Tracing pid 14 tid 100017 td 0xfffff800042c84c0
> > ivy_rng_store() at ivy_rng_store+0x31/frame 0xfffffe01ed6c6960
> > random_ivy_read() at random_ivy_read+0x78/frame 0xfffffe01ed6c6990
> > live_entropy_sources_feed() at live_entropy_sources_feed+0x73/frame
> > 0xfffffe01ed6c69d0
> > random_kthread() at random_kthread+0x224/frame 0xfffffe01ed6c6a30
> > fork_exit() at fork_exit+0x14a/frame 0xfffffe01ed6c6ab0
> > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe01ed6c6ab0
> > --- trap 0, rip = 0, rsp = 0xfffffe01ed6c6b70, rbp = 0 ---
> 
> Can you 'p $rdi'?

I don't have this core around any more.  The problem was fixed in r273027.

Navdeep