From: Michal Hocko <mhocko@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
James Hogan <jhogan@kernel.org>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Dave Hansen <dave.hansen@intel.com>,
Paul Mackerras <paulus@samba.org>,
sparclinux@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
linux-s390@vger.kernel.org, Michael Ellerman <mpe@ellerman.id.au>,
x86@kernel.org, Russell King - ARM Linux <linux@armlinux.org.uk>,
Matthew Wilcox <willy@infradead.org>,
Steven Price <Steven.Price@arm.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Gerald Schaefer <gerald.schaefer@de.ibm.com>,
linux-snps-arc@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
Kees Cook <keescook@chromium.org>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Mark Brown <broonie@kernel.org>, Qian Cai <cai@lca.pw>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Dan Williams <dan.j.williams@intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Sri Krishna chowdary <schowdary@nvidia.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-mips@vger.kernel.org, Ralf Baechle <ralf@linux-mips.org>,
Paul Burton <paul.burton@mips.com>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Vineet Gupta <vgupta@synopsys.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-dev@lists.ozlabs.org,
"David S. Miller" <davem@davemloft.net>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH V6 0/2] mm/debug: Add tests validating architecture page table helpers
Date: Wed, 16 Oct 2019 10:20:22 +0200 [thread overview]
Message-ID: <20191016082022.GN317@dhcp22.suse.cz> (raw)
In-Reply-To: <c052784a-a5d7-878e-cd97-01daa90c0ed8@arm.com>
On Tue 15-10-19 20:51:11, Anshuman Khandual wrote:
>
>
> On 10/15/2019 08:11 PM, Qian Cai wrote:
> > The x86 will crash with linux-next during boot due to this series (v5) with the
> > config below plus CONFIG_DEBUG_VM_PGTABLE=y. I am not sure if v6 would address
> > it.
> >
> > https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
> >
> > [ 33.862600][ T1] page:ffffea0009000000 is uninitialized and poisoned
> > [ 33.862608][ T1] raw: ffffffffffffffff ffffffffffffffff ffffffffffffffff
> > ffffff871140][ T1] ? _raw_spin_unlock_irq+0x27/0x40
> > [ 33.871140][ T1] ? rest_init+0x307/0x307
> > [ 33.871140][ T1] kernel_init+0x11/0x139
> > [ 33.871140][ T1] ? rest_init+0x307/0x307
> > [ 33.871140][ T1] ret_from_fork+0x27/0x50
> > [ 33.871140][ T1] Modules linked in:
> > [ 33.871140][ T1] ---[ end trace e99d392b0f7befbd ]---
> > [ 33.871140][ T1] RIP: 0010:alloc_gigantic_page_order+0x3fe/0x490
>
> Hmm, with defconfig (DEBUG_VM=y and DEBUG_VM_PGTABLE=y) it does not crash but
> with the config above, it does. Just wondering if it is possible that these
> pages might not been initialized yet because DEFERRED_STRUCT_PAGE_INIT=y ?
Quite likely. You need to wait for page_alloc_init_late to finish.
>
> [ 13.898549][ T1] page:ffffea0005000000 is uninitialized and poisoned
> [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffff
> [ 13.898549][ T1] raw: ffffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffff
> [ 13.898549][ T1] page dumped because: VM_BUG_ON_PAGE(PagePoisoned(p))
> [ 13.898549][ T1] ------------[ cut here ]------------
> [ 13.898549][ T1] kernel BUG at ./include/linux/mm.h:1107!
> [ 13.898549][ T1] invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
> [ 13.898549][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc3-next-20191015+ #
--
Michal Hocko
SUSE Labs
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prev parent reply other threads:[~2019-10-16 8:20 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1571131302-32290-1-git-send-email-anshuman.khandual@arm.com>
[not found] ` <1571131302-32290-2-git-send-email-anshuman.khandual@arm.com>
2019-10-15 10:45 ` [PATCH V6 1/2] mm/page_alloc: Make alloc_gigantic_page() available for general use Michal Hocko
2019-10-15 11:07 ` Anshuman Khandual
2019-10-15 11:42 ` David Hildenbrand
2019-10-15 11:47 ` Michal Hocko
2019-10-15 11:50 ` David Hildenbrand
2019-10-15 12:01 ` David Hildenbrand
2019-10-15 12:09 ` Michal Hocko
2019-10-15 12:11 ` Michal Hocko
[not found] ` <1571131302-32290-3-git-send-email-anshuman.khandual@arm.com>
2019-10-15 11:46 ` [PATCH V6 2/2] mm/debug: Add tests validating architecture page table helpers Michal Hocko
2019-10-15 12:27 ` Anshuman Khandual
2019-10-15 18:09 ` Qian Cai
2019-10-16 9:54 ` Anshuman Khandual
2019-10-15 14:41 ` [PATCH V6 0/2] " Qian Cai
2019-10-15 15:21 ` Anshuman Khandual
2019-10-15 18:42 ` Qian Cai
2019-10-16 8:59 ` Anshuman Khandual
2019-10-16 8:20 ` Michal Hocko [this message]
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