Messages in this thread | | | Date | Sat, 16 Feb 2013 09:29:54 +0100 | From | Ingo Molnar <> | Subject | Re: [-rc7 regression] Buggy commit: "mm: use aligned zone start for pfn_to_bitidx calculation" |
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* Greg KH <greg@kroah.com> wrote:
> On Fri, Feb 15, 2013 at 12:44:26PM +0100, Ingo Molnar wrote: > > > > [ Greg: -stable was Cc:-ed for this potentially buggy commit. ] > > > > * Yinghai Lu <yinghai@kernel.org> wrote: > > > > > On Thu, Feb 14, 2013 at 7:08 AM, Ingo Molnar <mingo@kernel.org> wrote: > > > > these three: > > > > > > > > 10d73e655cef mm: bootmem: fix free_all_bootmem_core() with odd bitmap alignment > > > > c060f943d092 mm: use aligned zone start for pfn_to_bitidx calculation > > > > c0232ae861df mm: memblock: fix wrong memmove size in memblock_merge_regions() > > > > > > > > might have highmem=512m boot parameter sensitivity. > > > > > > 10d73e655cef should not be related, as we are using nobootmem wrapper > > > of memblock. > > > c0232ae861df is copying less while using the blank slot in memblock > > > memory or reserved array > > > so it should be ok too. > > > > > > c060f943d092 may be related as you config does not have > > > CONFIG_SPARSEMEM defined. > > > > Right, that's the commit causing the x86 regression: > > > > c060f943d0929f3e429c5d9522290584f6281d6e is the first bad commit > > commit c060f943d0929f3e429c5d9522290584f6281d6e > > Date: Fri Jan 11 14:31:51 2013 -0800 > > > > mm: use aligned zone start for pfn_to_bitidx calculation > > > > I've given 6d92d4f (its parent commit) quite a bit of testing so > > I'm 99% sure in the validity of this bisection result. > > > > Involved parties Cc:-ed. > > > > Revert attached below - it reverts cleanly and I'll test this > > today, to see whether this solves the sporadic lockups. > > > > Thanks, > > > > Ingo > > > > -------------------> > > >From 6f3d5a8f38eb23f792b408d9bc8fee53a7d158f9 Mon Sep 17 00:00:00 2001 > > From: Ingo Molnar <mingo@kernel.org> > > Date: Fri, 15 Feb 2013 12:43:22 +0100 > > Subject: [PATCH] Revert "mm: use aligned zone start for pfn_to_bitidx > > calculation" > > > > This reverts commit c060f943d0929f3e429c5d9522290584f6281d6e. > > Let me know if I should be reverting this from the -stable releases.
It appears so - it definitely locks up here with the config I sent. It appears to be a rare bug but a bug.
Would be nice to hear from the authors/ackers/pushers of the patch though.
Thanks,
Ingo
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