From: David Daney <ddaney.cavm@gmail.com>
To: Aaro Koskinen <aaro.koskinen@nokia.com>
Cc: Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org
Subject: Re: THP broken on OCTEON?
Date: Wed, 22 Jun 2016 15:05:05 -0700 [thread overview]
Message-ID: <576B0B91.2020608@gmail.com> (raw)
In-Reply-To: <20160523151346.GA23204@ak-desktop.emea.nsn-net.net>
This is caused by a config bug.
For THP to work you must have both:
CONFIG_TRANSPARENT_HUGEPAGE=y
and
CONFIG_HUGETLBFS=y
Please try testing with both of those set as well as applying:
https://www.linux-mips.org/archives/linux-mips/2016-06/msg00397.html
I will look into either a Kconfig fix, or fixing the code that currently
depends on CONFIG_HUGETLBFS, but is needed for all huge pages.
The faults I saw are caused by:
#define pmd_huge(x) 0
In include/linux/hugetlb.h
Really we need to replace all occurrences of pmd_huge() under arch/mips
with something like pte_huge(), but I don't know if that is sufficient.
There may be other things gated by CONFIG_HUGETLBFS that I didn't see.
David.
On 05/23/2016 08:13 AM, Aaro Koskinen wrote:
> Hi,
>
> I'm getting kernel crashes (see below) reliably when building Perl in
> parallel (make -j16) on OCTEON EBH5600 board (8 cores, 4 GB RAM) with
> Linux 4.6.
>
> It seems that CONFIG_TRANSPARENT_HUGEPAGE has something to do with the
> issue - disabling it makes build go through fine.
>
> Any ideas?
>
> A.
>
> [ 2457.467155] Got mcheck at 00000001200a82b4
> [ 2457.479447] CPU: 6 PID: 15916 Comm: lib/unicore/mkt Not tainted 4.6.0-octeon-distro.git-v2.16-1-gfc3b10e-dirty-00001-g16a7aa0 #1
> [ 2457.514121] task: 80000000eccf2b80 ti: 80000000ecda4000 task.ti: 80000000ecda4000
> [ 2457.536551] $ 0 : 0000000000000000 3e000000105bc006 0000000000000000 ffffffff957e4728
> [ 2457.560686] $ 4 : 00000000000000f2 0000000000000067 000000012015e8ab 00000000332295cf
> [ 2457.584822] $ 8 : 0000000000000000 0000000000000000 0000000000000001 0000000000000003
> [ 2457.608957] $12 : 00000001204e04d8 0000000000000008 0000000000000001 ffffffffffffffff
> [ 2457.633093] $16 : 0000000120383d60 00000001203a3828 00000000332295cf 000000000000000b
> [ 2457.657228] $20 : 000000012015e8a0 0000000000000000 000000000000000c 0000000000000000
> [ 2457.681363] $24 : 0000000000000010 00000001200a80e8
> [ 2457.705496] $28 : 00000001201a0300 000000ffffda82a0 000000012019b9b8 0000000120039f5c
> [ 2457.729631] Hi : 0000000000000000
> [ 2457.740341] Lo : 0000000000000008
> [ 2457.751055] epc : 00000001200a82b4 0x1200a82b4
> [ 2457.764891] ra : 0000000120039f5c 0x120039f5c
> [ 2457.778726] Status: 00308cf3 KX SX UX USER EXL IE
> [ 2457.793284] Cause : 00800060 (ExcCode 18)
> [ 2457.805296] PrId : 000d0409 (Cavium Octeon+)
> [ 2457.818350] Index : 80000000
> [ 2457.827759] PageMask : 1fe000
> [ 2457.836646] EntryHi : 00000001203820f4
> [ 2457.848136] EntryLo0 : 00000000105b8006
> [ 2457.859628] EntryLo1 : 00000000105bc006
> [ 2457.871119] Wired : 0
> [ 2457.878704] PageGrain: e0000000
> [ 2457.888111]
> [ 2457.892573] Index: 25 pgmask=4kb va=00120456000 asid=f4
> [ 2457.908256] [ri=0 xi=0 pa=000e47d3000 c=0 d=1 v=1 g=0] [ri=0 xi=0 pa=000c31bc000 c=0 d=1 v=1 g=0]
> [ 2457.935230] Index: 26 pgmask=4kb va=001200a8000 asid=f4
> [ 2457.950915] [ri=0 xi=0 pa=000e0e1c000 c=0 d=0 v=1 g=0] [ri=0 xi=0 pa=000c50ed000 c=0 d=0 v=1 g=0]
> [ 2457.977888] Index: 27 pgmask=4kb va=001203a2000 asid=f4
> [ 2457.993574] [ri=0 xi=0 pa=00000000000 c=0 d=0 v=0 g=0] [ri=0 xi=1 pa=0009005a000 c=1 d=0 v=1 g=0]
> [ 2458.020548]
> [ 2458.025008]
> Code: de100000 1200001c 00000000 <de110008> 8e220000 1452fffa 00000000 8e220004 1453fff7
> [ 2458.054470] Kernel panic - not syncing: Caught Machine Check exception - caused by multiple matching entries in the TLB.
> [ 2458.087614] ---[ end Kernel panic - not syncing: Caught Machine Check exception - caused by multiple matching entries in the TLB.
> [ 2458.122835]
> do_page_fault(): sending SIGSEGV to make for invalid write access to 0000000000000012[ 2458.149565]
> [ 2458.149565] do_page_fault(): sending SIGSEGV to miniperl for invalid write access to 0000000000000010epc = 0000000120089500 in miniperl[120000000+181000]ra = 00000001200c18a4 in miniperl[120000000+181000][ 2458.149590]
>
> [ 2458.212999] epc = 0000000120015400 in make[120000000+35000]
> [ 2458.229780] ra = 000000ffeca7f570 in[ 2458.240797]
>
> *** NMI Watchdog interrupt on Core 0x0 ***
>
> A.
>
>
next prev parent reply other threads:[~2016-06-22 22:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 15:13 THP broken on OCTEON? Aaro Koskinen
2016-05-23 15:20 ` Ralf Baechle
2016-05-23 16:21 ` David Daney
2016-05-23 18:52 ` Aaro Koskinen
2016-05-23 19:03 ` David Daney
2016-05-23 19:03 ` David Daney
2016-05-23 19:08 ` Joshua Kinard
2016-05-23 20:02 ` Alastair Bridgewater
2016-05-23 18:57 ` Joshua Kinard
2016-05-23 19:22 ` Ralf Baechle
2016-05-23 19:40 ` Joshua Kinard
2016-05-23 20:01 ` Ralf Baechle
2016-05-24 21:21 ` Aaro Koskinen
2016-05-24 22:39 ` David Daney
2016-05-25 13:41 ` Aaro Koskinen
2016-05-26 9:33 ` Joshua Kinard
2016-05-26 13:36 ` Aaro Koskinen
2016-05-26 17:59 ` David Daney
2016-05-26 19:23 ` Aaro Koskinen
2016-05-26 22:13 ` David Daney
2016-05-27 17:14 ` Aaro Koskinen
2016-05-27 21:03 ` Joshua Kinard
2016-05-27 22:05 ` Aaro Koskinen
2016-05-27 22:22 ` Joshua Kinard
2016-06-22 22:05 ` David Daney [this message]
2016-06-23 12:08 ` Aaro Koskinen
2016-06-23 12:08 ` Aaro Koskinen
2016-06-24 11:38 ` Joshua Kinard
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