It happened again. also while doing a test build of libreoffice (very disk intensive stuff). The build process seems frozen. I did cat /var/log/kernel.log and run /bin/dmesg but didn't find any error. so I typed init s then echo w > /proc/sysrq-trigger and then I typed ps aux | grep D root 23 0.0 0.0 0 0 ? DN May25 0:06 [khugepaged] root 8673 0.0 0.0 4412 832 pts/2 S+ 08:02 0:00 grep D then I typed exit and I found the following in my kernel.log 11/05/26 07:54:00 udevd[7360] starting version 170 11/05/26 07:54:01 leds_ss4200 no LED devices found 11/05/26 07:54:01 intel_rng Firmware space is locked read-only. If you can't or 11/05/26 07:54:01 intel_rng don't want to disable this in firmware setup, and if 11/05/26 07:54:01 intel_rng you are certain that your system has a functional 11/05/26 07:54:01 intel_rng RNG, try using the 'no_fwh_detect' option. 11/05/26 07:54:32 SysRq Show Blocked State 11/05/26 07:54:32 task PC stack pid father 11/05/26 07:54:32 khugepaged D f4393ca4 0 23 2 0x00000000 11/05/26 07:54:32 f4393cb4 00000046 00000002 f4393ca4 f4044dcc 00000000 c0a8204e 000033ba 11/05/26 07:54:32 00000000 e20eba00 f4393c5c c10026ce 00000000 0098c500 00000001 c14e1440 11/05/26 07:54:32 f4393c64 c14e1440 f5506440 f4044da0 f4042f70 e20eba00 f4393d0c 00000286 11/05/26 07:54:32 Call Trace 11/05/26 07:54:32 [<c10026ce>] ? __switch_to+0xce/0x180 11/05/26 07:54:32 [<c1052076>] ? lock_timer_base.isra.31+0x26/0x50 11/05/26 07:54:32 [<c1052106>] ? try_to_del_timer_sync+0x66/0x100 11/05/26 07:54:32 [<c1052076>] ? lock_timer_base.isra.31+0x26/0x50 11/05/26 07:54:32 [<c132e3ca>] schedule_timeout+0x12a/0x2e0 11/05/26 07:54:32 [<c1051630>] ? init_timer_deferrable_key+0x20/0x20 11/05/26 07:54:32 [<c132e231>] io_schedule_timeout+0x81/0xd0 11/05/26 07:54:32 [<c10d7ea2>] congestion_wait+0x52/0xe0 11/05/26 07:54:32 [<c1061750>] ? abort_exclusive_wait+0x80/0x80 11/05/26 07:54:32 [<c10f2501>] compact_zone+0x721/0x750 11/05/26 07:54:32 [<c10f25a9>] compact_zone_order+0x79/0xa0 11/05/26 07:54:32 [<c10f266d>] try_to_compact_pages+0x9d/0xd0 11/05/26 07:54:32 [<c10c6eee>] __alloc_pages_direct_compact+0x7e/0x160 11/05/26 07:54:32 [<c10c73ad>] __alloc_pages_nodemask+0x3dd/0x7b0 11/05/26 07:54:32 [<c10e5f7c>] ? page_add_new_anon_rmap+0x8c/0xa0 11/05/26 07:54:32 [<c10faea8>] khugepaged+0x418/0xe10 11/05/26 07:54:32 [<c1061750>] ? abort_exclusive_wait+0x80/0x80 11/05/26 07:54:32 [<c10faa90>] ? khugepaged_defrag_store+0x50/0x50 11/05/26 07:54:32 [<c1061098>] kthread+0x68/0x70 11/05/26 07:54:32 [<c1061030>] ? kthread_worker_fn+0x150/0x150 11/05/26 07:54:32 [<c133147e>] kernel_thread_helper+0x6/0xd 11/05/26 07:54:32 Sched Debug Version v0.10, 2.6.39-ARCH #1 11/05/26 07:54:32 ktime : 56907897.973146 11/05/26 07:54:32 sched_clk : 56892856.276187 11/05/26 07:54:32 cpu_clk : 56907897.973092 11/05/26 07:54:32 jiffies : 16982371 11/05/26 07:54:32 sched_clock_stable : 0 11/05/26 07:54:32 11/05/26 07:54:32 sysctl_sched 11/05/26 07:54:32 .sysctl_sched_latency : 12.000000 11/05/26 07:54:32 .sysctl_sched_min_granularity : 1.500000 11/05/26 07:54:32 .sysctl_sched_wakeup_granularity : 2.000000 11/05/26 07:54:32 .sysctl_sched_child_runs_first : 0 11/05/26 07:54:32 .sysctl_sched_features : 7279 11/05/26 07:54:32 .sysctl_sched_tunable_scaling : 1 (logaritmic) 11/05/26 07:54:32 11/05/26 07:54:32 cpu#0, 2933.889 MHz 11/05/26 07:54:32 .nr_running : 1 11/05/26 07:54:32 .load : 1024 11/05/26 07:54:32 .nr_switches : 66131673 11/05/26 07:54:32 .nr_load_updates : 4725405 11/05/26 07:54:32 .nr_uninterruptible : 0 11/05/26 07:54:32 .next_balance : 16.982350 11/05/26 07:54:32 .curr->pid : 7949 11/05/26 07:54:32 .clock : 56907897.673964 11/05/26 07:54:32 .cpu_load[0] : 0 11/05/26 07:54:32 .cpu_load[1] : 0 11/05/26 07:54:32 .cpu_load[2] : 0 11/05/26 07:54:32 .cpu_load[3] : 0 11/05/26 07:54:32 .cpu_load[4] : 0 11/05/26 07:54:32 11/05/26 07:54:32 cfs_rq[0] autogroup-105 11/05/26 07:54:32 .exec_clock : 0.000000 11/05/26 07:54:32 .MIN_vruntime : 0.000001 11/05/26 07:54:32 .min_vruntime : 19.599979 11/05/26 07:54:32 .max_vruntime : 0.000001 11/05/26 07:54:32 .spread : 0.000000 11/05/26 07:54:32 .spread0 : -13633115.574964 11/05/26 07:54:32 .nr_spread_over : 0 11/05/26 07:54:32 .nr_running : 1 11/05/26 07:54:32 .load : 1024 11/05/26 07:54:32 .load_avg : 0.000000 11/05/26 07:54:32 .load_period : 9.999999 11/05/26 07:54:32 .load_contrib : 0 11/05/26 07:54:32 .load_tg : 0 11/05/26 07:54:32 .se->exec_start : 56907897.673964 11/05/26 07:54:32 .se->vruntime : 13633135.174943 11/05/26 07:54:32 .se->sum_exec_runtime : 19.279330 11/05/26 07:54:32 .se->load.weight : 1024 11/05/26 07:54:32 11/05/26 07:54:32 cfs_rq[0] 11/05/26 07:54:32 .exec_clock : 0.000000 11/05/26 07:54:32 .MIN_vruntime : 0.000001 11/05/26 07:54:32 .min_vruntime : 13633135.174943 11/05/26 07:54:32 .max_vruntime : 0.000001 11/05/26 07:54:32 .spread : 0.000000 11/05/26 07:54:32 .spread0 : 0.000000 11/05/26 07:54:32 .nr_spread_over : 0 11/05/26 07:54:32 .nr_running : 1 11/05/26 07:54:32 .load : 1024 11/05/26 07:54:32 .load_avg : 0.000000 11/05/26 07:54:32 .load_period : 0.000000 11/05/26 07:54:32 .load_contrib : 0 11/05/26 07:54:32 .load_tg : 0 11/05/26 07:54:32 11/05/26 07:54:32 runnable tasks 11/05/26 07:54:32 task PID tree-key switches prio exec-runtime sum-exec sum-sleep 11/05/26 07:54:32 ---------------------------------------------------------------------------------------------------------- 11/05/26 07:54:32 R bash 7949 19.599979 63 120 0 0 0.000000 0.000000 0.000000 /autogroup-105 11/05/26 07:54:32 11/05/26 07:54:32 cpu#1, 2933.889 MHz 11/05/26 07:54:32 .nr_running : 0 11/05/26 07:54:32 .load : 0 11/05/26 07:54:32 .nr_switches : 66462726 11/05/26 07:54:32 .nr_load_updates : 4571341 11/05/26 07:54:32 .nr_uninterruptible : 1 11/05/26 07:54:32 .next_balance : 16.982370 11/05/26 07:54:32 .curr->pid : 0 11/05/26 07:54:32 .clock : 56907897.675594 11/05/26 07:54:32 .cpu_load[0] : 0 11/05/26 07:54:32 .cpu_load[1] : 0 11/05/26 07:54:32 .cpu_load[2] : 0 11/05/26 07:54:32 .cpu_load[3] : 0 11/05/26 07:54:32 .cpu_load[4] : 5 11/05/26 07:54:32 11/05/26 07:54:32 cfs_rq[1] 11/05/26 07:54:32 .exec_clock : 0.000000 11/05/26 07:54:32 .MIN_vruntime : 0.000001 11/05/26 07:54:32 .min_vruntime : 13650531.404239 11/05/26 07:54:32 .max_vruntime : 0.000001 11/05/26 07:54:32 .spread : 0.000000 11/05/26 07:54:32 .spread0 : 17396.229296 11/05/26 07:54:32 .nr_spread_over : 0 11/05/26 07:54:32 .nr_running : 0 11/05/26 07:54:32 .load : 0 11/05/26 07:54:32 .load_avg : 0.000000 11/05/26 07:54:32 .load_period : 0.000000 11/05/26 07:54:32 .load_contrib : 0 11/05/26 07:54:32 .load_tg : 0 11/05/26 07:54:32 11/05/26 07:54:32 runnable tasks 11/05/26 07:54:32 task PID tree-key switches prio exec-runtime sum-exec sum-sleep 11/05/26 07:54:32 ---------------------------------------------------------------------------------------------------------- 11/05/26 07:54:32 11/05/26 07:55:01 usb 3-2 USB disconnect, device number 2 11/05/26 07:55:02 ppp0 Features changed: 0x00006800 -> 0x00006000 11/05/26 07:55:02 usb 3-2 new low speed USB device number 3 using uhci_hcd 11/05/26 07:55:03 input PIXART USB OPTICAL MOUSE as /devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.0/input/input9 11/05/26 07:55:03 generic-usb 0003 93A:2510.0002: input,hidraw0: USB HID v1.11 Mouse [PIXART USB OPTICAL MOUSE] on usb-0000:00:1d.1-2/input0 11/05/26 07:55:05 0000 2:05.0: tulip_stop_rxtx() failed (CSR5 0xfc664010 CSR6 0xff972113) 11/05/26 07:55:05 net eth0 Setting full-duplex based on MII#1 link partner capability of 45e1 11/05/26 07:55:05 w83627ehf Found W83627DHG chip at 0x290 11/05/26 07:55:12 eth0 no IPv6 routers present 11/05/26 07:55:19 EXT4-fs (dm-0) re-mounted. Opts: user_xattr,commit=0 11/05/26 07:55:19 EXT4-fs (sda1) re-mounted. Opts: user_xattr,commit=0 11/05/26 07:55:20 EXT4-fs (dm-1) re-mounted. Opts: user_xattr,commit=0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>