linux-kernel - Re: 3.0.3 oops. memory related?

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Date:	Wed, 7 Sep 2011 09:13:39 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Anders <aeriksson2@...il.com>, linux-mm <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org, srostedt@...hat.com,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: 3.0.3 oops. memory related?

On Wed, 7 Sep 2011 08:38:18 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> On Tue, 06 Sep 2011 19:50:09 +0200
> Anders <aeriksson2@...il.com> wrote:
> 
> > On 09/05/11 02:49, KAMEZAWA Hiroyuki wrote:
> > > On Sun, 04 Sep 2011 20:49:42 +0200
> > > Anders <aeriksson2@...il.com> wrote:
> > >
> > > > I've got kdump setup to collect oopes. I found this in the log. Not sure
> > > > what it's related to.
> > > > 
> > >
> > > > <4>[47900.533010]  [<ffffffff810ab79f>] ?
> > > > mem_cgroup_count_vm_event+0x15/0x67
> > > > <4>[47900.533010]  [<ffffffff810987e5>] ? handle_mm_fault+0x3b/0x1e8
> > > > <4>[47900.533010]  [<ffffffff81049bb3>] ? sched_clock_local+0x13/0x76
> > > > <4>[47900.533010]  [<ffffffff8101bdb0>] ? do_page_fault+0x31a/0x33f
> > > > <4>[47900.533010]  [<ffffffff81022b80>] ? check_preempt_curr+0x36/0x62
> > > > <4>[47900.533010]  [<ffffffff8104bb23>] ? ktime_get_ts+0x65/0xa6
> > > > <4>[47900.533010]  [<ffffffff810bfd2c>] ?
> > > > poll_select_copy_remaining+0xce/0xed
> > > > <4>[47900.533010]  [<ffffffff814c4b4f>] ? page_fault+0x1f/0x30
> > >
> > > I'll check memcg but...not sure what parts in above log are garbage.
> > > At quick glance, mem_cgroup_count_vm_event() does enough NULL check
> > > but faulted address was..
> > >
> > > > <0>[47900.533010] CR2: ffffc5217e257cf0
> > >
> > > This seems not NULL referencing.
> > >
> > > #define VMALLOC_START    _AC(0xffffc90000000000, UL)
> > > #define VMALLOC_END      _AC(0xffffe8ffffffffff, UL)
> > >
> > > This is not vmalloc area...hmm. could you show your disassemble of
> > > mem_cgroup_count_vm_event() ? and .config ?
> > >
> > How do I disassembe it?
> > 
> 
> # make mm/memcontrol.o
> # objdump -d memcontrol.o > file
> 
> please cut out mem_cgroup_count_vm_event() from dumpped file.
> 

Sorry, I made mistake ..the log says

<1>[47900.533010] RIP  [<ffffffff81097d18>] handle_pte_fault+0x24/0x70a
<4>[47900.533010]  RSP <ffff880024c27db8>
<0>[47900.533010] CR2: ffffc5217e257cf0

<4>[47900.533010] RSP: 0000:ffff880024c27db8  EFLAGS: 00010296
<4>[47900.533010] RAX: 0000000000000cf0 RBX: ffff88006c3b2a68 RCX:
ffffc5217e257cf0
<4>[47900.533010] RDX: 000000000059effe RSI: ffff88006c3b2a68 RDI:
ffff88006d6d2ac0
<4>[47900.533010] RBP: ffffc5217e257cf0 R08: ffff880024d3b010 R09:
0000000000000028
Hm. CR2==RBP...then accessing RBP caused the fault. But it seems this
RBP was accessed in this function before reaching EIP.

your .config says
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_FP_TEST=y
CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
CONFIG_HAVE_C_RECORDMCOUNT=y

In my binary,

ffffffff8113b820 <handle_pte_fault>:
ffffffff8113b820:       55                      push   %rbp
ffffffff8113b821:       48 89 e5                mov    %rsp,%rbp
ffffffff8113b824:       48 81 ec c0 00 00 00    sub    $0xc0,%rsp
ffffffff8113b82b:       48 89 5d d8             mov    %rbx,-0x28(%rbp)
ffffffff8113b82f:       4c 89 65 e0             mov    %r12,-0x20(%rbp)
ffffffff8113b833:       4c 89 6d e8             mov    %r13,-0x18(%rbp)
ffffffff8113b837:       4c 89 75 f0             mov    %r14,-0x10(%rbp)
ffffffff8113b83b:       4c 89 7d f8             mov    %r15,-0x8(%rbp)
ffffffff8113b83f:       e8 fc d4 47 00          callq  ffffffff815b8d40 <mcount>
ffffffff8113b844:       4c 89 45 b8             mov    %r8,-0x48(%rbp)
ffffffff8113b848:       4c 8b 29                mov    (%rcx),%r13

handle_pte_fault + 0x24 is just after mcount. And caused fault by accessing 
%rbp...returning from a funciton ?
Hmm...problem with tracing ? I'm sorry if I misunderstand something.
Anyway, CCing ftrace guys for getting information.

Thanks,
-Kame









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