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From: John Baldwin <jhb@freebsd.org>
To: freebsd-hackers@freebsd.org
Subject: Re: panic in ivy_rng_store() when compiled with -O0
Date: Fri, 17 Oct 2014 11:53:58 -0400
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 (bigwig.baldwin.cx); Fri, 17 Oct 2014 12:52:24 -0400 (EDT)
Cc: Navdeep Parhar <np@freebsd.org>
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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'?

-- 
John Baldwin