Dear All,<br><br>We got following oops in one of our SLES 11 server. This occurred inside swapd and we running our server swap turned off..<br><br>Could this be memory corruption or possible old bug in code ?<br><br>Please help.<br>
Thanks<br><br>Dec 6 22:55:46 tm-spes-md102 kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
<br>Dec 6 22:55:46 tm-spes-md102 kernel: IP: [<ffffffffa0250659>] xfs_count_page_state+0x25/0x66 [xfs]
<br>Dec 6 22:55:46 tm-spes-md102 kernel: PGD 37dc4e067 PUD 16f631067 PMD 0
<br>Dec 6 22:55:46 tm-spes-md102 kernel: Oops: 0000 [1] SMP
<br>Dec 6 22:55:46 tm-spes-md102 kernel: last sysfs file: /sys/devices/pci0000:00/0000:00:03.0/0000:15:00.0/infiniband/mlx4_0/node_type
<br>Dec 6 22:55:46 tm-spes-md102 kernel: CPU 2
<br>Dec 6 22:55:46 tm-spes-md102 kernel: Modules linked in: af_packet st ide_disk ide_cd_mod lp parport_pc ppdev parport nfs lockd nfs_acl
<br>sunrpc ipmi_devintf ipmi_si ipmi_msghandler bonding microcode binfmt_misc rdma_ucm(N) ib_sdp(N) rdma_cm(N) iw_cm(N) ib_addr(N) ib_ipoib(
<br>N) ib_cm(N) ib_sa(N) ipv6 ib_uverbs(N) ib_umad(N) mlx4_en(N) mlx4_ib(N) ib_mthca(N) ib_mad(N) ib_core(N) fuse ext2 xfs loop dm_mod joyde
<br>v cdc_ether rtc_cmos usbhid usbnet rtc_core mlx4_core(N) hid shpchp i2c_i801 pci_hotplug button pcspkr mii sr_mod i2c_core rtc_lib ff_me
<br>mless cdrom sg uhci_hcd sd_mod ehci_hcd crc_t10dif usbcore edd ext3 mbcache jbd fan thermal processor thermal_sys hwmon ide_pci_generic
<br>ide_core ata_generic ata_piix libata dock megaraid_sas scsi_mod [last unloaded: parport_pc]
<br>Dec 6 22:55:46 tm-spes-md102 kernel: Supported: No, Unsupported modules are loaded
<br>Dec 6 22:55:46 tm-spes-md102 kernel: Pid: 58, comm: kswapd0 Tainted: G 2.6.27.45-0.1-default #1
<br>Dec 6 22:55:46 tm-spes-md102 kernel: RIP: 0010:[<ffffffffa0250659>] [<ffffffffa0250659>] xfs_count_page_state+0x25/0x66 [xfs]
<br>Dec 6 22:55:46 tm-spes-md102 kernel: RSP: 0018:ffff88037cdcbbe8 EFLAGS: 00010207
<br>Dec 6 22:55:46 tm-spes-md102 kernel: RAX: ffff88038ceff610 RBX: ffffe20012c30b40 RCX: ffff88037cdcbc34
<br>Dec 6 22:55:46 tm-spes-md102 kernel: RDX: ffff88037cdcbc38 RSI: ffff88037cdcbc3c RDI: ffffe20012c30b40
<br>Dec 6 22:55:46 tm-spes-md102 kernel: RBP: 0000000000000000 R08: 0000000000000021 R09: 0000000000000000
<br>Dec 6 22:55:46 tm-spes-md102 kernel: R10: ffff88038ceff678 R11: ffffffffa0251b18 R12: ffff880517690480
<br>Dec 6 22:55:46 tm-spes-md102 kernel: R13: ffff88037cdcbce0 R14: 00000000002548c2 R15: ffff880517690590
<br>Dec 6 22:55:46 tm-spes-md102 kernel: FS: 0000000000000000(0000) GS:ffff88037e520e40(0000) knlGS:0000000000000000
<br>Dec 6 22:55:46 tm-spes-md102 kernel: CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
<br>Dec 6 22:55:46 tm-spes-md102 kernel: CR2: 0000000000000000 CR3: 000000016f670000 CR4: 00000000000006e0
<br>Dec 6 22:55:46 tm-spes-md102 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<br>Dec 6 22:55:46 tm-spes-md102 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
<br>Dec 6 22:55:46 tm-spes-md102 kernel: Process kswapd0 (pid: 58, threadinfo ffff88037cdca000, task ffff88037cdc8780)
<br>Dec 6 22:55:47 tm-spes-md102 kernel: Stack: ffffffffa0251b68 0000000000000000 0000000000000001 0000000000000000
<br>Dec 6 22:55:47 tm-spes-md102 kernel: 0000000000000001 0000000000000000 0000000000000000 0000000000000000
<br>Dec 6 22:55:47 tm-spes-md102 kernel: 0000000000000000 00000000002acfa4 0000000000000000 ffffe20012c30b40
<br>Dec 6 22:55:47 tm-spes-md102 kernel: Call Trace:
<br>Dec 6 22:55:47 tm-spes-md102 kernel: [<ffffffffa0251b68>] xfs_vm_releasepage+0x50/0xa5 [xfs]
<br>Dec 6 22:55:47 tm-spes-md102 kernel: [<ffffffff8028bf57>] __invalidate_mapping_pages+0x98/0x12d
<br>Dec 6 22:55:47 tm-spes-md102 kernel: [<ffffffff802c4ca1>] prune_icache+0xe7/0x1f7
<br>Dec 6 22:55:47 tm-spes-md102 kernel: [<ffffffff802c4dc6>] shrink_icache_memory+0x15/0x32
<br>Dec 6 22:55:47 tm-spes-md102 kernel: [<ffffffff8028dc59>] shrink_slab+0xe4/0x157
<br>Dec 6 22:55:47 tm-spes-md102 kernel: [<ffffffff8028e173>] balance_pgdat+0x292/0x3d6
<br>Dec 6 22:55:53 tm-spes-md102 kernel: [<ffffffff8028e3e1>] kswapd+0x12a/0x12c
<br>Dec 6 22:55:53 tm-spes-md102 kernel: [<ffffffff8024fb2f>] kthread+0x47/0x73
<br>Dec 6 22:55:53 tm-spes-md102 kernel: [<ffffffff8020cfb9>] child_rip+0xa/0x11
<br>Dec 6 22:55:53 tm-spes-md102 kernel:
<br>Dec 6 22:55:53 tm-spes-md102 kernel:
<br>Dec 6 22:55:53 tm-spes-md102 kernel: Code: 1f eb ef 90 90 90 c7 01 00 00 00 00 c7 02 00 00 00 00 c7 06 00 00 00 00 48 8b 07 f6 c4 10 75
<br>04 0f 0b eb fe 48 8b 47 10 49 89 c1 <4d> 8b 01 41 f6 c0 01 74 0e 41 f6 c0 20 75 08 c7 02 01 00 00 00
<br>Dec 6 22:55:53 tm-spes-md102 kernel: RIP [<ffffffffa0250659>] xfs_count_page_state+0x25/0x66 [xfs]
<br>Dec 6 22:55:53 tm-spes-md102 kernel: RSP <ffff88037cdcbbe8>
<br>Dec 6 22:55:53 tm-spes-md102 kernel: CR2: 0000000000000000
<br><br clear="all">__<br>Tharindu <i>R</i> Bamunuarachchi.<br><br>