From: hyl <heyongli@xxxxxxxxx> Date: Fri, 14 Aug 2009 11:16:41 +0800 > console is: (access the address 0xffff fff0 ) > SUN4V-DTLB: Error at TPC[5f2cc8], tl 1 > SUN4V-DTLB: TPC<memcpy_user_stub+0x8/0x40> > SUN4V-DTLB: O7[4af23c] > SUN4V-DTLB: O7<probe_kernel_read+0x3c/0xa0> > SUN4V-DTLB: vaddr[ffffffffffffe000] ctx[0] pte[800007ffffffe743] error[2] > > > the problem is : > this DTLB fault can be fixed by search extable, by fall to the > do_sparc64_fault, my draft proposal can verify this: with this patch, this kind > of fault is recovery, so enable copy_from_user return error instead of halt. > > in addition, it is triggered in kernel space, search the extable is mandatory . No, that's not the problem. The problem is that the virtual address validation done in the TLB miss path accepts the address printed in: > SUN4V-DTLB: vaddr[ffffffffffffe000] ctx[0] pte[800007ffffffe743] error[2] That's the real bug, not any of the other things you are talking about. Your "fix" would only paper over this problem. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
