Re: [BUG][s390x] mm: system crashed

[Zhouping Liu <zliu@redhat.com>]

Hello Heiko,

----- Original Message -----
> From: "Heiko Carstens" <heiko.carstens@de.ibm.com>
> To: "Zhouping Liu" <zliu@redhat.com>
> Cc: linux-mm@kvack.org, "LKML" <linux-kernel@vger.kernel.org>, "caiqian" <caiqian@redhat.com>, "Caspar Zhang"
> <czhang@redhat.com>, "Martin Schwidefsky" <schwidefsky@de.ibm.com>
> Sent: Tuesday, April 16, 2013 3:50:47 PM
> Subject: Re: [BUG][s390x] mm: system crashed
> 
> On Mon, Apr 15, 2013 at 02:16:55PM +0800, Zhouping Liu wrote:
> > On 04/15/2013 01:56 PM, Heiko Carstens wrote:
> > >On Sun, Apr 14, 2013 at 11:28:40PM -0400, Zhouping Liu wrote:
> > >>� 16109.346170¨ Call Trace:
> > >>� 16109.346179¨ (� <0000000000100920>¨ show_trace+0x128/0x12c)
> > >>� 16109.346195¨  � <00000000001cd320>¨ rcu_check_callbacks+0x458/0xccc
> > >>� 16109.346209¨  � <0000000000140f2e>¨ update_process_times+0x4a/0x74
> > >>� 16109.346222¨  � <0000000000199452>¨
> > >>tick_sched_handle.isra.12+0x5e/0x70
> > >>� 16109.346235¨  � <00000000001995aa>¨ tick_sched_timer+0x6a/0x98
> > >>� 16109.346247¨  � <000000000015c1ea>¨ __run_hrtimer+0x8e/0x200
> > >>� 16109.346381¨  � <000000000015d1b2>¨ hrtimer_interrupt+0x212/0x2b0
> > >>� 16109.346385¨  � <00000000001040f6>¨ clock_comparator_work+0x4a/0x54
> > >>� 16109.346390¨  � <000000000010d658>¨ do_extint+0x158/0x15c
> > >>� 16109.346396¨  � <000000000062aa24>¨ ext_skip+0x38/0x3c
> > >>� 16109.346404¨  � <00000000001153c8>¨ smp_yield_cpu+0x44/0x48
> > >>� 16109.346412¨ (� <000003d10051aec0>¨ 0x3d10051aec0)
> > >>� 16109.346457¨  � <000000000024206a>¨ __page_check_address+0x16a/0x170
> > >>� 16109.346466¨  � <00000000002423a2>¨ page_referenced_one+0x3e/0xa0
> > >>� 16109.346501¨  � <000000000024427c>¨ page_referenced+0x32c/0x41c
> > >>� 16109.346510¨  � <000000000021b1dc>¨ shrink_page_list+0x380/0xb9c
> > >>� 16109.346521¨  � <000000000021c0a6>¨ shrink_inactive_list+0x1c6/0x56c
> > >>� 16109.346532¨  � <000000000021c69e>¨ shrink_lruvec+0x252/0x56c
> > >>� 16109.346542¨  � <000000000021ca44>¨ shrink_zone+0x8c/0x1bc
> > >>� 16109.346553¨  � <000000000021d080>¨ balance_pgdat+0x50c/0x658
> > >>� 16109.346564¨  � <000000000021d318>¨ kswapd+0x14c/0x470
> > >>� 16109.346576¨  � <0000000000158292>¨ kthread+0xda/0xe4
> > >>� 16109.346656¨  � <000000000062a5de>¨ kernel_thread_starter+0x6/0xc
> > >>� 16109.346682¨  � <000000000062a5d8>¨ kernel_thread_starter+0x0/0xc
> > >>[-- MARK -- Fri Apr 12 06:15:00 2013]
> > >>� 16289.386061¨ INFO: rcu_sched self-detected stall on CPU { 0}  (t=42010
> > >>jiffies
> > >>  g=89766 c=89765 q=10627)
> > >Did the system really crash or did you just see the rcu related
> > >warning(s)?
> > 
> > I just check it again, actually at first the system didn't really
> > crash, but the system is very slow in response.
> > and the reproducer process can't be killed, after I did some common
> > actions such as 'ls' 'vim' etc, the system
> > seemed to be really crashed, no any response.
> > 
> > also in the previous testing, I can remember that the system would
> > be no any response for a long time, just only
> > repeatedly print out the such above 'Call Trace' into console.
> 
> Ok, thanks.
> Just a couple of more questions: did you see this also on other archs, or
> just
> s390 (if you tried other platforms at all).
> 
> If you have some time, could you please repeat your test with the kernel
> command line option " user_mode=home "?

I tested the system with the kernel parameter, but the issue still appeared,
I just to say it takes longer time to reproduce the issue than the before.

> 
> As far as I can tell there was only one s390 patch merged that was
> mmap related: 486c0a0bc80d370471b21662bf03f04fbb37cdc6 "s390/mm: Fix crst
> upgrade of mmap with MAP_FIXED".

also I tested the revert commit, unluckily, the same issue as the before.


-- 
Thanks,
Zhouping

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