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Date: Mon, 3 Feb 2014 13:20:52 +0100
From: Michal Hocko <mhocko@suse.cz>
To: Holger Kiehl <Holger.Kiehl@dwd.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@suse.de>,
        linux-mm@kvack.org
Subject: Re: Need help in bug in isolate_migratepages_range
Message-ID: <20140203122052.GC2495@dhcp22.suse.cz>
References: <alpine.LRH.2.02.1401312037340.6630@diagnostix.dwd.de>
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[CCing linux-mm]

Does this ring bells? I haven't checked very deeply but it doesn't seem
to be fixed since 3.12.

Hoolger, could you post your config, please?

On Fri 31-01-14 21:12:27, Holger Kiehl wrote:
> Hello,
> 
> today one of our system got a kernel bug message. It kept on running
> but more and more process begin to be stuck in D state (eg. a simple w
> command would never return) and I eventually had to reboot. Here the
> full message:
> 
>    Jan 31 13:07:43 asterix kernel: BUG: unable to handle kernel NULL pointer dereference at 000000000000001c
>    Jan 31 13:07:43 asterix kernel: IP: [<ffffffff810af0ac>] isolate_migratepages_range+0x32d/0x653
>    Jan 31 13:07:43 asterix kernel: PGD 7d3074067 PUD 7d3073067 PMD 0
>    Jan 31 13:07:43 asterix kernel: Oops: 0000 [#1] SMP
>    Jan 31 13:07:43 asterix kernel: Modules linked in: drbd lru_cache coretemp ipmi_devintf bonding nf_conntrack_ftp binfmt_misc usbhid i2c_i801 sg ehci_pci i2c_core ehci_hcd uhci_hcd i5000_edac i5k_amb ipmi_si ipmi_msghandler usbcore usb_common [last unloaded: microcode]
>    Jan 31 13:07:43 asterix kernel: CPU: 5 PID: 14164 Comm: java Not tainted 3.12.9 #1
>    Jan 31 13:07:43 asterix kernel: Hardware name: FUJITSU SIEMENS PRIMERGY RX300 S4             /D2519, BIOS 4.06  Rev. 1.04.2519             07/30/2008
>    Jan 31 13:07:43 asterix kernel: task: ffff8807d30b08c0 ti: ffff8807d30b2000 task.ti: ffff8807d30b2000
>    Jan 31 13:07:43 asterix kernel: RIP: 0010:[<ffffffff810af0ac>]  [<ffffffff810af0ac>] isolate_migratepages_range+0x32d/0x653
>    Jan 31 13:07:43 asterix kernel: RSP: 0000:ffff8807d30b3928  EFLAGS: 00010286
>    Jan 31 13:07:43 asterix kernel: RAX: 0000000000000000 RBX: 000000000020ec09 RCX: 0000000000000002
>    Jan 31 13:07:43 asterix kernel: RDX: 2c00000000008000 RSI: 0000000000000004 RDI: 000000000000006c
>    Jan 31 13:07:43 asterix kernel: RBP: ffff8807d30b39f8 R08: ffff88083fbde390 R09: 0000000000000001
>    Jan 31 13:07:43 asterix kernel: R10: 0000000000000000 R11: ffffea000733a000 R12: ffff8807d30b3a58
>    Jan 31 13:07:43 asterix kernel: R13: ffffea000733a1f8 R14: 0000000000000000 R15: ffff88083ffe1d80
>    Jan 31 13:07:43 asterix kernel: FS:  00007f9d9e72f910(0000) GS:ffff88083fd40000(0000) knlGS:0000000000000000
>    Jan 31 13:07:43 asterix kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>    Jan 31 13:07:43 asterix kernel: CR2: 000000000000001c CR3: 00000007d3070000 CR4: 00000000000407e0
>    Jan 31 13:07:43 asterix kernel: Stack:
>    Jan 31 13:07:43 asterix kernel: 0000000000000009 ffff88083ffe16c0 ffffea00002e6af0 ffff8807d30b3998
>    Jan 31 13:07:43 asterix kernel: ffff8807d30b2010 00ff8807d30b08c0 ffff8807d30b08c0 000000000020f000
>    Jan 31 13:07:43 asterix kernel: 0000000000000000 000000000000083b 000000000000000a ffff8807d30b3a68
>    Jan 31 13:07:43 asterix kernel: Call Trace:
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810a161f>] ? lru_add_drain_cpu+0x25/0x97
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810af687>] compact_zone+0x2b5/0x319
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810da586>] ? put_super+0x20/0x2c
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810afa4d>] compact_zone_order+0xad/0xc4
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810afaf5>] try_to_compact_pages+0x91/0xe8
>    Jan 31 13:07:43 asterix kernel: [<ffffffff8109b92d>] ? page_alloc_cpu_notify+0x3e/0x3e
>    Jan 31 13:07:43 asterix kernel: [<ffffffff8109da34>] __alloc_pages_direct_compact+0xae/0x195
>    Jan 31 13:07:43 asterix kernel: [<ffffffff8109e45d>] __alloc_pages_nodemask+0x772/0x7b5
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810c85a3>] alloc_pages_vma+0xd6/0x101
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810d47e3>] do_huge_pmd_anonymous_page+0x199/0x2ee
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810b3884>] handle_mm_fault+0x1b7/0xceb
>    Jan 31 13:07:43 asterix kernel: [<ffffffff8105dedc>] ? __dequeue_entity+0x2e/0x33
>    Jan 31 13:07:43 asterix kernel: [<ffffffff8102d8c3>] __do_page_fault+0x3bd/0x3e4
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810bbe1a>] ? mprotect_fixup+0x1c9/0x1fb
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810aa0f0>] ? vm_mmap_pgoff+0x6d/0x8f
>    Jan 31 13:07:43 asterix kernel: [<ffffffff810795f5>] ? SyS_futex+0x103/0x13d
>    Jan 31 13:07:43 asterix kernel: [<ffffffff8102d8f3>] do_page_fault+0x9/0xb
>    Jan 31 13:07:43 asterix kernel: [<ffffffff813d3672>] page_fault+0x22/0x30
>    Jan 31 13:07:43 asterix kernel: Code: 00 41 f7 45 00 ff ff ff 01 0f 85 43 02 00 00 41 8b 45 18 85 c0 0f 89 37 02 00 00 49 8b 55 00 4c 89 e8 66 85 d2 79 04 49 8b 45 30 <8b> 40 1c 83 f8 01 0f 85 1b 02 00 00 49 8b 55 08 30 c0 48 85 d2
>    Jan 31 13:07:43 asterix kernel: RIP  [<ffffffff810af0ac>] isolate_migratepages_range+0x32d/0x653
>    Jan 31 13:07:43 asterix kernel: RSP <ffff8807d30b3928>
>    Jan 31 13:07:43 asterix kernel: CR2: 000000000000001c
>    Jan 31 13:07:43 asterix kernel: ---[ end trace fba75c5b0b9175ea ]---
> 
> Kernel is a plain kernel.org kernel 3.12.9 and it uses drbd to replicate
> data to another host. Any idea what the cause of this bug is? Could it be
> hardware? The system has been running now for five years without any problems.
> 
> Please CC me since I am not on the list.
> 
> Many thanks in advance.
> 
> Regards,
> Holger
> --
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-- 
Michal Hocko
SUSE Labs
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