Ubuntu 10.10 8 core machine with 16 GB RAM, Intel board with (2) 4 core Xeon's. RAID 6 array with 6 disks in software RAID (mdraid) After large copy job to vbox virutal machine on this host found this on console: Swap space is on RAID 6 array. "[314082.372497] Bug: soft lockup - CPU #2 stuck for 61s! [kswapd0: 75]" followed by some hex code. This error was preceded by several errors like this: Info: task kdmflush: 572 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. Info: task jbd2/md2-8:589 blocked for more than 120 seconds. Info: task flush-9:2:639 blocked for more than 120 seconds. Info: task jbd2/dm-0-8:1371 blocked for more than 120 seconds. Info: task rsyslogd:7393 blocked for more than 120 seconds. Info: task master:1569 blocked for more than 120 seconds. The machine was not locked up and I have not yet attempted a reboot but this is very concerning. Here's the soft lockup error from dmesg: [314082.372497] BUG: soft lockup - CPU#2 stuck for 61s! [kswapd0:75] [314082.372550] Modules linked in: vboxnetadp vboxnetflt vboxdrv lp ioatdma parp ort joydev i7core_edac hed edac_core raid10 raid456 async_pq async_xor xor async _memcpy async_raid6_recov usbhid hid igb dca raid6_pq async_tx raid1 raid0 multi path linear [314082.372576] CPU 2 [314082.372578] Modules linked in: vboxnetadp vboxnetflt vboxdrv lp ioatdma parp ort joydev i7core_edac hed edac_core raid10 raid456 async_pq async_xor xor async _memcpy async_raid6_recov usbhid hid igb dca raid6_pq async_tx raid1 raid0 multi path linear [314082.372605] [314082.372609] Pid: 75, comm: kswapd0 Not tainted 2.6.35-28-server #49-Ubuntu S 5520HC/S5520HC [314082.372612] RIP: 0010:[] [] zone_nr_fre e_pages+0x0/0xc0 [314082.372620] RSP: 0018:ffff880265dade08 EFLAGS: 00000282 [314082.372624] RAX: 0000000000000020 RBX: ffff880265dade40 RCX: 000000000000000 0 [314082.372627] RDX: 0000000000000895 RSI: 0000000000000000 RDI: ffff880100000e0 0 [314082.372631] RBP: ffffffff8100aa8e R08: 0000000000000000 R09: 000000000000010 0 [314082.372634] R10: 0000000000000000 R11: 0000000000000003 R12: 000000000000000 0 [314082.372637] R13: ffff880265dade04 R14: ffff8802668144d0 R15: ffff880265daddb 0 [314082.372642] FS: 0000000000000000(0000) GS:ffff880001e20000(0000) knlGS:0000 000000000000 [314082.372646] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [314082.372649] CR2: 0000000001e003c0 CR3: 0000000001a2a000 CR4: 00000000000026e 0 [314082.372652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000000 0 [314082.372656] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 000000000000040 0 [314082.372660] Process kswapd0 (pid: 75, threadinfo ffff880265dac000, task ffff 8802668144d0) [314082.372662] Stack: [314082.372700] ffffffff8110700a ffff880265dade40 ffff880100000000 000000000000 0002 [314082.372705] <0> ffff8802668144d0 ffff880265dade70 ffff8801000040a8 ffff88026 5dadee0 [314082.372711] <0> ffffffff81111f6c ffff880265dadfd8 0000000000000000 000000006 5dadfd8 [314082.372717] Call Trace: [314082.372760] [] ? zone_watermark_ok+0x2a/0xf0 [314082.372765] [] ? kswapd+0x25c/0x300 [314082.372770] [] ? autoremove_wake_function+0x0/0x40 [314082.372775] [] ? kswapd+0x0/0x300 [314082.372780] [] ? kthread+0x96/0xa0 [314082.372785] [] ? kernel_thread_helper+0x4/0x10 [314082.372790] [] ? kthread+0x0/0xa0 [314082.372794] [] ? kernel_thread_helper+0x0/0x10 [314082.372797] Code: 48 89 c2 e8 13 36 fe ff 89 df e8 6c e5 fd ff 48 8b 5d d8 4 c 8b 65 e0 4c 8b 6d e8 4c 8b 75 f0 4c 8b 7d f8 c9 c3 90 90 90 90 90 90 <55> 48 8 9 e5 48 83 ec 20 48 89 5d e8 4c 89 65 f0 4c 89 6d f8 0f [314082.373196] Call Trace: [314082.373201] [] ? zone_watermark_ok+0x2a/0xf0 [314082.373205] [] ? kswapd+0x25c/0x300 [314082.373210] [] ? autoremove_wake_function+0x0/0x40 [314082.373215] [] ? kswapd+0x0/0x300 [314082.373219] [] ? kthread+0x96/0xa0 [314082.373224] [] ? kernel_thread_helper+0x4/0x10 [314082.373229] [] ? kthread+0x0/0xa0 [314082.373234] [] ? kernel_thread_helper+0x0/0x10

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