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Date: Sun, 22 Mar 2015 22:00:24 -0400 (EDT) From: David Miller <davem@...emloft.net> To: david.ahern@...cle.com Cc: torvalds@...ux-foundation.org, sparclinux@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org, bpicco@...oft.net Subject: Re: 4.0.0-rc4: panic in free_block From: David Ahern <david.ahern@...cle.com> Date: Sun, 22 Mar 2015 18:03:30 -0600 > On 3/22/15 5:54 PM, David Miller wrote: >>> I just put it on 4.0.0-rc4 and ditto -- problem goes away, so it >>> clearly suggests the memcpy or memmove are the root cause. >> >> Thanks, didn't notice that. >> >> So, something is amuck. > > to continue to refine the problem ... I modified only the memmove > lines (not the memcpy) and it works fine. So its the memmove. > > I'm sure this will get whitespaced damaged on the copy and paste but > to be clear this is the patch I am currently running and system is > stable. On Friday it failed on every single; with this patch I have > allyesconfig builds with -j 128 in a loop (clean in between) and > nothing -- no panics. Can you just try calling memcpy(), that should work because I think we agree that if the memcpy() implementation copies from low to high it should work. I wonder if the triggering factor is configuring for a high number of cpus. I always have NR_CPUS=128 since that's the largest machine I have. I'll give NR_CPUS=1024 a spin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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