Message-ID: <alpine.LRH.2.02.1401312037340.6630@diagnostix.dwd.de>
Date:	Fri, 31 Jan 2014 21:12:27 +0000 (GMT)
From:	Holger Kiehl <Holger.Kiehl@....de>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Need help in bug in isolate_migratepages_range

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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