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From: Tejun Heo <tj@kernel.org>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Miller <davem@davemloft.net>,
	hpa@linux.intel.com, linux-mm <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Early boot panic on machine with lots of memory
Date: Mon, 18 Jun 2012 15:32:03 -0700	[thread overview]
Message-ID: <20120618223203.GE32733@google.com> (raw)
In-Reply-To: <1339667440.3321.7.camel@lappy>

On Thu, Jun 14, 2012 at 11:50:40AM +0200, Sasha Levin wrote:
> On Thu, 2012-06-14 at 12:20 +0900, Tejun Heo wrote:
> > On Wed, Jun 13, 2012 at 11:38:55PM +0200, Sasha Levin wrote:
> > > Hi all,
> > > 
> > > I'm seeing the following when booting a KVM guest with 65gb of RAM, on latest linux-next.
> > > 
> > > Note that it happens with numa=off.
> > > 
> > > [    0.000000] BUG: unable to handle kernel paging request at ffff88102febd948
> > > [    0.000000] IP: [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155
> > 
> > Can you map it back to the source line please?
> 
> mm/memblock.c:583
> 
>                         phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
>   97:   85 d2                   test   %edx,%edx
>   99:   74 08                   je     a3 <__next_free_mem_range+0xa3>
>   9b:   49 8b 48 f0             mov    -0x10(%r8),%rcx
>   9f:   49 03 48 e8             add    -0x18(%r8),%rcx
> 
> It's the deref on 9b (r8=ffff88102febd958).

* Can you please post disassembly of the whole function?  It seems
  like rsv->regions[] was corrupt.  I want to verify other registers
  too.

* Can you please try the following patch?

  https://lkml.org/lkml/2012/6/15/510

Thanks.

-- 
tejun

WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj@kernel.org>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	David Miller <davem@davemloft.net>,
	hpa@linux.intel.com, linux-mm <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Early boot panic on machine with lots of memory
Date: Mon, 18 Jun 2012 15:32:03 -0700	[thread overview]
Message-ID: <20120618223203.GE32733@google.com> (raw)
In-Reply-To: <1339667440.3321.7.camel@lappy>

On Thu, Jun 14, 2012 at 11:50:40AM +0200, Sasha Levin wrote:
> On Thu, 2012-06-14 at 12:20 +0900, Tejun Heo wrote:
> > On Wed, Jun 13, 2012 at 11:38:55PM +0200, Sasha Levin wrote:
> > > Hi all,
> > > 
> > > I'm seeing the following when booting a KVM guest with 65gb of RAM, on latest linux-next.
> > > 
> > > Note that it happens with numa=off.
> > > 
> > > [    0.000000] BUG: unable to handle kernel paging request at ffff88102febd948
> > > [    0.000000] IP: [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155
> > 
> > Can you map it back to the source line please?
> 
> mm/memblock.c:583
> 
>                         phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
>   97:   85 d2                   test   %edx,%edx
>   99:   74 08                   je     a3 <__next_free_mem_range+0xa3>
>   9b:   49 8b 48 f0             mov    -0x10(%r8),%rcx
>   9f:   49 03 48 e8             add    -0x18(%r8),%rcx
> 
> It's the deref on 9b (r8=ffff88102febd958).

* Can you please post disassembly of the whole function?  It seems
  like rsv->regions[] was corrupt.  I want to verify other registers
  too.

* Can you please try the following patch?

  https://lkml.org/lkml/2012/6/15/510

Thanks.

-- 
tejun

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  parent reply	other threads:[~2012-06-18 22:32 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-13 21:38 Early boot panic on machine with lots of memory Sasha Levin
2012-06-14  3:20 ` Tejun Heo
2012-06-14  3:20   ` Tejun Heo
2012-06-14  9:50   ` Sasha Levin
2012-06-14  9:50     ` Sasha Levin
2012-06-14 20:56     ` Yinghai Lu
2012-06-14 20:56       ` Yinghai Lu
2012-06-14 21:34       ` Sasha Levin
2012-06-14 21:34         ` Sasha Levin
2012-06-14 23:57         ` Yinghai Lu
2012-06-14 23:57           ` Yinghai Lu
2012-06-15  0:59           ` Sasha Levin
2012-06-15  0:59             ` Sasha Levin
2012-06-15  0:59             ` Sasha Levin
2012-06-15  2:21             ` Yinghai Lu
2012-06-15  2:21               ` Yinghai Lu
2012-06-15  7:41               ` Sasha Levin
2012-06-15  7:41                 ` Sasha Levin
2012-06-18 22:32     ` Tejun Heo [this message]
2012-06-18 22:32       ` Tejun Heo
2012-06-18 22:50       ` Sasha Levin
2012-06-18 22:50         ` Sasha Levin
2012-06-19  4:11         ` Gavin Shan
2012-06-19  4:11           ` Gavin Shan
2012-06-19  5:43           ` Yinghai Lu
2012-06-19  5:43             ` Yinghai Lu
2012-06-19  6:09             ` Gavin Shan
2012-06-19  6:09               ` Gavin Shan
2012-06-19 18:12               ` Yinghai Lu
2012-06-19 18:12                 ` Yinghai Lu
2012-06-19 21:20           ` Tejun Heo
2012-06-19 21:20             ` Tejun Heo
2012-06-19 21:26             ` Tejun Heo
2012-06-19 21:26               ` Tejun Heo
2012-06-20  2:57               ` Yinghai Lu
2012-06-21 20:17                 ` Tejun Heo
2012-06-21 20:17                   ` Tejun Heo
2012-06-22  1:47                   ` Yinghai Lu
2012-06-22  1:58                     ` Yinghai Lu
2012-06-22 18:51                     ` Tejun Heo
2012-06-22 18:51                       ` Tejun Heo
2012-06-22 19:23                       ` Yinghai Lu
2012-06-22 19:23                         ` Yinghai Lu
2012-06-22 19:29                         ` Tejun Heo
2012-06-22 19:29                           ` Tejun Heo
2012-06-22 20:01                           ` Yinghai Lu
2012-06-22 20:01                             ` Yinghai Lu
2012-06-22 20:14                             ` Tejun Heo
2012-06-22 20:14                               ` Tejun Heo
2012-06-22 20:23                               ` Yinghai Lu
2012-06-22 20:23                                 ` Yinghai Lu
2012-06-23  2:14                           ` Yinghai Lu
2012-06-27 18:13                             ` Tejun Heo
2012-06-27 18:13                               ` Tejun Heo
2012-06-27 19:22                               ` Yinghai Lu
2012-06-27 19:22                                 ` Yinghai Lu
2012-06-27 19:26                                 ` Tejun Heo
2012-06-27 19:26                                   ` Tejun Heo
2012-06-27 21:15                                   ` Yinghai Lu
2012-06-29 18:27                                     ` [PATCH for -3.5] memblock: free allocated memblock_reserved_regions later Yinghai Lu
2012-06-29 18:27                                       ` Yinghai Lu
2012-06-29 18:32                                       ` Tejun Heo
2012-06-29 18:32                                         ` Tejun Heo
2012-06-29 18:38                                         ` Yinghai Lu
2012-06-29 18:38                                           ` Yinghai Lu
2012-06-21 20:19             ` Early boot panic on machine with lots of memory Tejun Heo
2012-06-21 20:19               ` Tejun Heo
2012-06-22 10:29               ` Sasha Levin
2012-06-22 10:29                 ` Sasha Levin
2012-06-22 18:15                 ` Yinghai Lu
2012-06-22 18:15                   ` Yinghai Lu

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